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The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible
bean A bean is the seed of several plants in the family Fabaceae, which are used as vegetables for human or animal food. They can be cooked in many different ways, including boiling, frying, and baking, and are used in many traditional dishes thr ...
, which has numerous uses. Traditional unfermented food uses of soybeans include soy milk, from which tofu and
tofu skin Tofu skin, Yuba, beancurd skin, beancurd sheet, or beancurd robes is a food product made from soybeans. During the boiling of soy milk, in an open shallow pan, a film or skin composed primarily of a soy protein-lipid complex forms on the liquid ...
are made. Fermented soy foods include soy sauce,
fermented bean paste Fermented bean paste is a category of fermented foods typically made from ground soybeans, which are indigenous to the cuisines of East, South and Southeast Asia. In some cases, such as the production of ''miso'', other varieties of beans, such a ...
,
nattō , spelled as natto in standard English language use, is a traditional Japanese food made from whole soybeans that have been fermented with ''Bacillus subtilis'' var. ''natto''. It is often served as a breakfast food with rice. It is served wit ...
, and
tempeh Tempeh or tempe (; jv, ꦠꦺꦩ꧀ꦥꦺ, témpé, ) is a traditional Indonesian food made from fermented soybeans. It is made by a natural culturing and controlled fermentation process that binds soybeans into a cake form. A fungus, '' Rhizo ...
. Fat-free (defatted) soybean meal is a significant and cheap source of protein for animal feeds and many packaged meals. For example, soybean products, such as
textured vegetable protein Textured or texturized vegetable protein (TVP), also known as textured soy protein (TSP), soy meat, or soya chunks is a defatted soy flour product, a by-product of extracting soybean oil. It is often used as a meat analogue or meat extender. ...
(TVP), are ingredients in many meat and dairy substitutes. Soybeans contain significant amounts of
phytic acid Phytic acid is a six-fold dihydrogenphosphate ester of inositol (specifically, of the ''myo'' isomer), also called inositol hexakisphosphate (IP6) or inositol polyphosphate. At physiological pH, the phosphates are partially ionized, resulting in ...
,
dietary minerals In the context of nutrition, a mineral is a chemical element required as an essential nutrient by organisms to perform functions necessary for life. However, the four major structural elements in the human body by weight (oxygen, hydrogen, carbon, ...
and
B vitamins B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism and synthesis of red blood cells. Though these vitamins share similar names (B1, B2, B3, etc.), they are chemically distinct compounds that often coexi ...
. Soy vegetable oil, used in food and industrial applications, is another product of processing the soybean crop. Soybean is the most important protein source for feed farm animals (that in turn yields animal protein for human consumption).


Etymology

The word "soy" originated as a corruption of the
Cantonese Cantonese ( zh, t=廣東話, s=广东话, first=t, cy=Gwóngdūng wá) is a language within the Chinese (Sinitic) branch of the Sino-Tibetan languages originating from the city of Guangzhou (historically known as Canton) and its surrounding ar ...
or Japanese names for soy sauce () . The etymology of the genus, ''Glycine'', comes from Linnaeus. When naming the genus, Linnaeus observed that one of the species within the genus had a sweet root. Based on the sweetness, the Greek word for sweet, glykós, was Latinized. The genus name is not related to the amino acid
glycine Glycine (symbol Gly or G; ) is an amino acid that has a single hydrogen atom as its side chain. It is the simplest stable amino acid ( carbamic acid is unstable), with the chemical formula NH2‐ CH2‐ COOH. Glycine is one of the proteinogen ...
.


Classification

The genus ''Glycine'' is divided into two subgenera, ''Glycine'' and ''Soja''. The subgenus ''Soja'' (Moench) F.J. Herm. includes the cultivated soybean, ''Glycine max'' (L.) Merr., and the wild soybean, ''
Glycine soja ''Glycine soja'', or wild soybean (previously ''G. ussuriensis'') is an annual plant in the legume family. It is the closest living relative of soybean The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native ...
'' Sieb. & Zucc. Both species are annuals. ''Glycine soja'' is the wild ancestor of ''Glycine max'', and grows wild in China, Japan, Korea and
Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eight ...
. The subgenus ''Glycine'' consists of at least 25 wild
perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...
species: for example, ''Glycine canescens'' F.J. Herm. and ''G. tomentella'' Hayata, both found in Australia and Papua New Guinea. Perennial soybean (''
Neonotonia wightii ''Neonotonia wightii'', the perennial soybean, is a species of flowering plant in the family Fabaceae, native to subSaharan Africa, Yemen, India, and Sri Lanka, and widely introduced as a forage in Brazil, Bolivia, Paraguay, northern Argentina, t ...
'') originated in Africa and is now a widespread pasture crop in the tropics. Like some other crops of long domestication, the relationship of the modern soybean to wild-growing species can no longer be traced with any degree of certainty. It is a cultural variety with a very large number of cultivars.


Description

Like most plants, soybeans grow in distinct morphological stages as they develop from seeds into fully mature plant.


Germination

The first stage of growth is
germination Germination is the process by which an organism grows from a seed or spore. The term is applied to the sprouting of a seedling from a seed of an angiosperm or gymnosperm, the growth of a sporeling from a spore, such as the spores of fungi, fer ...
, a method which first becomes apparent as a seed's
radicle In botany, the radicle is the first part of a seedling (a growing plant embryo) to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil (the shoot emerges from the ...
emerges. This is the first stage of root growth and occurs within the first 48 hours under ideal growing conditions. The first photosynthetic structures, the cotyledons, develop from the hypocotyl, the first plant structure to emerge from the soil. These cotyledons both act as leaves and as a source of nutrients for the immature plant, providing the seedling nutrition for its first 7 to 10 days.


Maturation

The first true leaves develop as a pair of single blades. Subsequent to this first pair, mature nodes form compound leaves with three blades. Mature
trifoliolate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular ...
leaves, having three to four leaflets per leaf, are often between long and broad. Under ideal conditions, stem growth continues, producing new nodes every four days. Before flowering, roots can grow per day. If
rhizobia Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes (Fabaceae). To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In ...
are present, root nodulation begins by the time the third node appears. Nodulation typically continues for 8 weeks before the symbiotic infection process stabilizes. The final characteristics of a soybean plant are variable, with factors such as genetics, soil quality, and climate affecting its form; however, fully mature soybean plants are generally between in height and have rooting depths between .


Flowering

Flowering is triggered by day length, often beginning once days become shorter than 12.8 hours. This trait is highly variable however, with different varieties reacting differently to changing day length. Soybeans form inconspicuous, self-fertile flowers which are borne in the
axil A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, ste ...
of the leaf and are white, pink or purple. Though they do not require pollination, they are attractive to bees, because they produce nectar that is high in sugar content. Depending on the soybean variety, node growth may cease once flowering begins. Strains that continue nodal development after flowering are termed " indeterminates" and are best suited to climates with longer growing seasons. Often soybeans drop their leaves before the seeds are fully mature. The fruit is a hairy pod that grows in clusters of three to five, each pod is long and usually contains two to four (rarely more) seeds 5–11 mm in diameter. Soybean seeds come in a wide variety of sizes and
hull Hull may refer to: Structures * Chassis, of an armored fighting vehicle * Fuselage, of an aircraft * Hull (botany), the outer covering of seeds * Hull (watercraft), the body or frame of a ship * Submarine hull Mathematics * Affine hull, in affi ...
colors such as black, brown, yellow, and green. Variegated and bicolored seed coats are also common.


Seed resilience

The hull of the mature bean is hard, water-resistant, and protects the cotyledon and hypocotyl (or "germ") from damage. If the seed coat is cracked, the seed will not germinate. The scar, visible on the seed coat, is called the hilum (colors include black, brown, buff, gray and yellow) and at one end of the hilum is the micropyle, or small opening in the seed coat which can allow the absorption of water for sprouting. Some seeds such as soybeans containing very high levels of protein can undergo
desiccation Desiccation () is the state of extreme dryness, or the process of extreme drying. A desiccant is a hygroscopic (attracts and holds water) substance that induces or sustains such a state in its local vicinity in a moderately sealed container. ...
, yet survive and revive after water absorption.
A. Carl Leopold Aldo Carl Leopold (December 18, 1919 – November 18, 2009) was an American academic and plant physiologist, son of Aldo Leopold, a noted ecologist. He is known for his research on soybeans which led to techniques allowing insulin to be dried ...
began studying this capability at the
Boyce Thompson Institute for Plant Research The Boyce Thompson Institute (previously: Boyce Thompson Institute for Plant Research) is an independent research institute devoted to using plant sciences to improve agriculture, protect the environment, and enhance human health. The Boyce Thom ...
at
Cornell University Cornell University is a private statutory land-grant research university based in Ithaca, New York. It is a member of the Ivy League. Founded in 1865 by Ezra Cornell and Andrew Dickson White, Cornell was founded with the intention to teac ...
in the mid-1980s. He found soybeans and corn to have a range of soluble carbohydrates protecting the seed's cell viability. Patents were awarded to him in the early 1990s on techniques for protecting biological membranes and proteins in the dry state.


Nitrogen-fixing ability

Like many legumes, soybeans can fix atmospheric nitrogen, due to the presence of
symbiotic Symbiosis (from Greek , , "living together", from , , "together", and , bíōsis, "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasi ...
bacteria from the
Rhizobia Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes (Fabaceae). To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In ...
group.


Chemical composition

Together, protein and soybean oil content account for 56% of dry soybeans by weight (36% protein and 20%
fat In nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such compounds, most commonly those that occur in living beings or in food. The term often refers specifically to triglycerides (triple est ...
, table). The remainder consists of 30% carbohydrates, 9% water and 5%
ash Ash or ashes are the solid remnants of fires. Specifically, ''ash'' refers to all non-aqueous, non-gaseous residues that remain after something burns. In analytical chemistry, to analyse the mineral and metal content of chemical samples, ash ...
(table). Soybeans comprise approximately 8% seed coat or hull, 90% cotyledons and 2% hypocotyl axis or germ.


Nutrition

A 100-gram reference quantity of raw soybeans supplies of
food energy Food energy is chemical energy that animals (including humans) derive from their food to sustain their metabolism, including their muscular activity. Most animals derive most of their energy from aerobic respiration, namely combining the carbohyd ...
and are 9% water, 30% carbohydrates, 20% total
fat In nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such compounds, most commonly those that occur in living beings or in food. The term often refers specifically to triglycerides (triple est ...
and 36% protein (table). Soybeans are a rich source of essential nutrients, providing in a 100-gram serving (raw, for reference) high contents of the Daily Value (DV) especially for protein (36% DV), dietary fiber (37%), iron (121%), manganese (120%), phosphorus (101%) and several
B vitamins B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism and synthesis of red blood cells. Though these vitamins share similar names (B1, B2, B3, etc.), they are chemically distinct compounds that often coexi ...
, including folate (94%) (table). High contents also exist for
vitamin K Vitamin K refers to structurally similar, fat-soluble vitamers found in foods and marketed as dietary supplements. The human body requires vitamin K for post-synthesis modification of certain proteins that are required for blood coagulation ...
, magnesium, zinc and potassium (table). For human consumption, soybeans must be cooked with "wet" heat to destroy the
trypsin inhibitor A trypsin inhibitor (TI) is a protein and a type of serine protease inhibitor ( serpin) that reduces the biological activity of trypsin by controlling the activation and catalytic reactions of proteins. Trypsin is an enzyme involved in the breakdow ...
s (
serine protease inhibitor Serpins are a superfamily of proteins with similar structures that were first identified for their protease inhibition activity and are found in all kingdoms of life. The acronym serpin was originally coined because the first serpins to be i ...
s). Raw soybeans, including the immature green form, are toxic to all
monogastric A monogastric organism has a simple single-chambered stomach (one stomach). Examples of monogastric herbivores are horses and rabbits. Examples of monogastric omnivores include humans, pigs, hamsters and rats. Furthermore, there are monogastric ca ...
animals.


Protein

Most soy protein is a relatively heat-stable storage protein. This heat stability enables soy food products requiring high temperature cooking, such as tofu, soy milk and
textured vegetable protein Textured or texturized vegetable protein (TVP), also known as textured soy protein (TSP), soy meat, or soya chunks is a defatted soy flour product, a by-product of extracting soybean oil. It is often used as a meat analogue or meat extender. ...
(soy flour) to be made. Soy protein is essentially identical to the protein of other legume seeds and
pulses In medicine, a pulse represents the tactile arterial palpation of the cardiac cycle (heartbeat) by trained fingertips. The pulse may be palpated in any place that allows an artery to be compressed near the surface of the body, such as at the nec ...
. Soy is a good source of protein for vegetarians and
vegans Veganism is the practice of abstaining from the use of animal product—particularly in diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan. Di ...
or for people who want to reduce the amount of meat they eat, according to the US Food and Drug Administration: Although soybeans have high protein content, soybeans also contain high levels of
protease inhibitors Protease inhibitors (PIs) are medications that act by interfering with enzymes that cleave proteins. Some of the most well known are antiviral drugs widely used to treat HIV/AIDS and hepatitis C. These protease inhibitors prevent viral replicat ...
, which can prevent digestion. Protease inhibitors are reduced by cooking soybeans, and are present in low levels in soy products such as tofu and soy milk. The
Protein Digestibility Corrected Amino Acid Score Protein digestibility-corrected amino acid score (PDCAAS) is a method of evaluating the quality of a protein based on both the amino acid requirements of humans and their ability to digest it. The PDCAAS rating was adopted by the US FDA and the F ...
(PDCAAS) of soy protein is the nutritional equivalent of meat, eggs, and
casein Casein ( , from Latin ''caseus'' "cheese") is a family of related phosphoproteins ( αS1, aS2, β, κ) that are commonly found in mammalian milk, comprising about 80% of the proteins in cow's milk and between 20% and 60% of the proteins in human ...
for human growth and health. Soybean protein isolate has a biological value of 74, whole soybeans 96, soybean milk 91, and eggs 97. All
spermatophytes A spermatophyte (; ), also known as phanerogam (taxon Phanerogamae) or phaenogam (taxon Phaenogamae), is any plant that produces seeds, hence the alternative name seed plant. Spermatophytes are a subset of the embryophytes or land plants. They inc ...
, except for the family of grasses and cereals ( Poaceae), contain 7S (vicilin) and 11S (legumin) soy protein-like globulin storage proteins; or only one of these
globulin The globulins are a family of globular proteins that have higher molecular weights than albumins and are insoluble in pure water but dissolve in dilute salt solutions. Some globulins are produced in the liver, while others are made by the immune ...
proteins. S denotes
Svedberg A Svedberg unit or svedberg (symbol S, sometimes Sv) is a non- SI metric unit for sedimentation coefficients. The Svedberg unit offers a measure of a particle's size indirectly based on its sedimentation rate under acceleration (i.e. how fast a ...
, sedimentation coefficients. Oats and rice are anomalous in that they also contain a majority of soybean-like protein.Seed Proteins; Peter R. Shewery and Rod Casey (Eds) 1999. Kluwer Academic Publishers, Dordrecht, The Netherlands Cocoa, for example, contains the 7S globulin, which contributes to cocoa/chocolate taste and aroma, whereas coffee beans (coffee grounds) contain the 11S globulin responsible for coffee's aroma and flavor. Vicilin and legumin proteins belong to the
cupin superfamily The cupin superfamily is a diverse superfamily of proteins named after its conserved barrel domain (''cupa'' being the Latin term for a small barrel). The superfamily includes a wide variety of enzymes as well as non-enzymatic seed storage ...
, a large family of functionally diverse proteins that have a common origin and whose evolution can be followed from bacteria to eukaryotes including animals and higher plants. 2S
albumins Albumin is a family of globular proteins, the most common of which are the serum albumins. All the proteins of the albumin family are water-soluble, moderately soluble in concentrated salt solutions, and experience heat denaturation. Albumins ...
form a major group of homologous storage proteins in many
dicot The dicotyledons, also known as dicots (or, more rarely, dicotyls), are one of the two groups into which all the flowering plants (angiosperms) were formerly divided. The name refers to one of the typical characteristics of the group: namely, ...
species and in some
monocots Monocotyledons (), commonly referred to as monocots, ( Lilianae ''sensu'' Chase & Reveal) are grass and grass-like flowering plants (angiosperms), the seeds of which typically contain only one embryonic leaf, or cotyledon. They constitute one of ...
but not in grasses (cereals). Soybeans contain a small but significant 2S storage protein. 2S albumin are grouped in the
prolamin Prolamins are a group of plant storage proteins having a high proline amino acid content. They are found in plants, mainly in the seeds of cereal grains such as wheat (gliadin), barley (hordein), rye ( secalin), corn ( zein), sorghum ( kafirin ...
superfamily. Other allergenic proteins included in this 'superfamily' are the non-specific plant lipid transfer proteins,
alpha amylase inhibitor In molecular biology, alpha-amylase inhibitor (or α-...) is a protein family which inhibits mammalian alpha-amylases specifically, by forming a tight stoichiometric 1:1 complex with alpha-amylase. This family of inhibitors has no action on plant ...
,
trypsin inhibitors A trypsin inhibitor (TI) is a protein and a type of serine protease inhibitor (serpin) that reduces the biological activity of trypsin by controlling the activation and catalytic reactions of proteins. Trypsin is an enzyme involved in the breakdown ...
, and prolamin storage proteins of cereals and grasses. Peanuts, for instance, contain 20% 2S albumin but only 6% 7S globulin and 74% 11S. It is the high 2S albumin and low 7S globulin that is responsible for the relatively low lysine content of peanut protein compared to soy protein.


Carbohydrates

The principal soluble carbohydrates of mature soybeans are the disaccharide sucrose (range 2.5–8.2%), the trisaccharide
raffinose Raffinose is a trisaccharide composed of galactose, glucose, and fructose. It can be found in beans, cabbage, brussels sprouts, broccoli, asparagus, other vegetables, and whole grains. Raffinose can be hydrolyzed to D-galactose and sucrose ...
(0.1–1.0%) composed of one sucrose molecule connected to one molecule of
galactose Galactose (, '' galacto-'' + ''-ose'', "milk sugar"), sometimes abbreviated Gal, is a monosaccharide sugar that is about as sweet as glucose, and about 65% as sweet as sucrose. It is an aldohexose and a C-4 epimer of glucose. A galactose molec ...
, and the tetrasaccharide
stachyose Stachyose is a tetrasaccharide consisting of two α--galactose units, one α--glucose unit, and one β--fructose unit sequentially linked as gal(α1→6)gal(α1→6)glc(α1↔2β)fru. Together with related oligosaccharides such as raffinose, stach ...
(1.4 to 4.1%) composed of one sucrose connected to two molecules of galactose. While the oligosaccharides raffinose and stachyose protect the viability of the soybean seed from desiccation (see above section on physical characteristics) they are not digestible sugars, so contribute to flatulence and abdominal discomfort in humans and other
monogastric A monogastric organism has a simple single-chambered stomach (one stomach). Examples of monogastric herbivores are horses and rabbits. Examples of monogastric omnivores include humans, pigs, hamsters and rats. Furthermore, there are monogastric ca ...
animals, comparable to the disaccharide
trehalose Trehalose (from Turkish '' tıgala'' – a sugar derived from insect cocoons + -ose) is a sugar consisting of two molecules of glucose. It is also known as mycose or tremalose. Some bacteria, fungi, plants and invertebrate animals synthesize it ...
. Undigested oligosaccharides are broken down in the intestine by native microbes, producing gases such as carbon dioxide, hydrogen, and methane. Since soluble soy carbohydrates are found in the whey and are broken down during fermentation, soy concentrate, soy protein isolates, tofu, soy sauce, and sprouted soybeans are without flatus activity. On the other hand, there may be some beneficial effects to ingesting oligosaccharides such as raffinose and stachyose, namely, encouraging indigenous
bifidobacteria ''Bifidobacterium'' is a genus of gram-positive, nonmotile, often branched anaerobic bacteria. They are ubiquitous inhabitants of the gastrointestinal tract though strains have been isolated from the vagina and mouth ('' B. dentium'') of ma ...
in the colon against putrefactive bacteria. The insoluble carbohydrates in soybeans consist of the complex polysaccharides
cellulose Cellulose is an organic compound with the formula , a polysaccharide consisting of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units. Cellulose is an important structural component of the primary cell wall ...
, hemicellulose, and pectin. The majority of soybean carbohydrates can be classed as belonging to dietary fiber.


Fats

Raw soybeans are 20% fat, including saturated fat (3%),
monounsaturated fat Monounsaturated fats are fatty acids that have one double bond in the fatty acid chain with all of the remainder carbon atoms being single-bonded. By contrast, polyunsaturated fats have more than one double bond. Molecular description Fatty acid ...
(4%) and polyunsaturated fat, mainly as
linoleic acid Linoleic acid (LA) is an organic compound with the formula COOH(CH2)7CH=CHCH2CH=CH(CH2)4CH3. Both alkene groups are ''cis''. It is a fatty acid sometimes denoted 18:2 (n-6) or 18:2 ''cis''-9,12. A linoleate is a salt or ester of this acid. L ...
(table). Within soybean oil or the lipid portion of the seed is contained four
phytosterol Phytosterols are phytosteroids, similar to cholesterol, that serve as structural components of biological membranes of plants. They encompass plant sterols and stanols. More than 250 sterols and related compounds have been identified. Free phyt ...
s:
stigmasterol Stigmasterol – a plant sterol (''phytosterol'') – is among the most abundant of plant sterols, having a major function to maintain the structure and physiology of cell membranes. In the European Union, it is a food additive listed with E numb ...
, sitosterol,
campesterol Campesterol is a phytosterol whose chemical structure is similar to that of cholesterol, and is one of the ingredients for E number E499. Natural occurrences Many vegetables, fruits, nuts, and seeds contain campesterol, but in low concentrat ...
, and
brassicasterol Brassicasterol (24-methyl cholest-5,22-dien-3β-ol) is a 28- carbon sterol synthesised by several unicellular algae ( phytoplankton) and some terrestrial plants, like rape. This compound has frequently been used as a biomarker for the presence of ...
accounting for about 2.5% of the lipid fraction; and which can be converted into steroid hormones. Additionally soybeans are a rich source of sphingolipids.


Other constituents

Soy contains
isoflavone Isoflavones are substituted derivatives of isoflavone, a type of naturally occurring isoflavonoids, many of which act as phytoestrogens in mammals. Isoflavones are produced almost exclusively by the members of the bean family, Fabaceae (Leguminosae) ...
s— polyphenolic compounds, produced by legumes including peanuts and
chickpea The chickpea or chick pea (''Cicer arietinum'') is an annual legume of the family Fabaceae, subfamily Faboideae. Its different types are variously known as gram" or Bengal gram, garbanzo or garbanzo bean, or Egyptian pea. Chickpea seeds are high ...
s. Isoflavones are closely related to flavonoids found in other plants, vegetables and flowers. Soy contains the
phytoestrogen A phytoestrogen is a plant-derived xenoestrogen (see estrogen) not generated within the endocrine system, but consumed by eating plants or manufactured foods. Also called a "dietary estrogen", it is a diverse group of naturally occurring nonster ...
coumestans, also are found in beans and split-peas, with the best sources being alfalfa, clover, and soybean sprouts.
Coumestrol Coumestrol is a natural organic compound in the class of phytochemicals known as coumestans. Coumestrol was first identified as a compound with estrogenic properties by E. M. Bickoff in ladino clover and alfalfa in 1957. It has garnered research ...
, an isoflavone
coumarin Coumarin () or 2''H''-chromen-2-one is an aromatic organic chemical compound with formula . Its molecule can be described as a benzene molecule with two adjacent hydrogen atoms replaced by a lactone-like chain , forming a second six-membered ...
derivative, is the only coumestan in foods. Saponins, a class of natural surfactants (soaps), are sterols that are present in small amounts in various plant foods, including soybeans, other legumes, and cereals, such as oats.


Comparison to other major staple foods

The following table shows the nutrient content of green soybean and other major staple foods, each in respective raw form on a dry weight basis to account for their different water contents. Raw soybeans, however, are not edible and cannot be digested. These must be sprouted, or prepared and cooked for human consumption. In sprouted and cooked form, the relative nutritional and anti-nutritional contents of each of these grains is remarkably different from that of raw form of these grains reported in this table. The nutritional value of soybean and each cooked staple depends on the processing and the method of cooking: boiling, frying, roasting, baking, etc.


Cultivation


Uses

During World War II, soybeans became important in both North America and Europe chiefly as substitutes for other protein foods and as a source of edible oil. During the war, the soybean was discovered as fertilizer due to
nitrogen fixation Nitrogen fixation is a chemical process by which molecular nitrogen (), with a strong triple covalent bond, in the air is converted into ammonia () or related nitrogenous compounds, typically in soil or aquatic systems but also in industry. A ...
by the United States Department of Agriculture.


Conditions

Cultivation is successful in climates with hot summers, with optimum growing conditions in mean temperatures of ; temperatures of below and over stunt growth significantly. They can grow in a wide range of soils, with optimum growth in moist
alluvial soil Alluvium (from Latin ''alluvius'', from ''alluere'' 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluv ...
s with good organic content. Soybeans, like most legumes, perform
nitrogen fixation Nitrogen fixation is a chemical process by which molecular nitrogen (), with a strong triple covalent bond, in the air is converted into ammonia () or related nitrogenous compounds, typically in soil or aquatic systems but also in industry. A ...
by establishing a
symbiotic Symbiosis (from Greek , , "living together", from , , "together", and , bíōsis, "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasi ...
relationship with the bacterium ''
Bradyrhizobium japonicum ''Bradyrhizobium japonicum'' is a species of legume- root nodulating, microsymbiotic nitrogen-fixing bacteria. The species is one of many Gram-negative, rod-shaped bacteria commonly referred to as rhizobia. Within that broad classification, whi ...
'' (
syn. The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnae ...
''Rhizobium japonicum''; Jordan 1982). This ability to fix nitrogen allows farmers to reduce nitrogen fertilizer use and increase yields when growing other crops in rotation with soy. There may be some trade-offs, however, in the long-term abundance of organic material in soils where soy and other crops (for example,
corn Maize ( ; ''Zea mays'' subsp. ''mays'', from es, maíz after tnq, mahiz), also known as corn (North American and Australian English), is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. The ...
) are grown in rotation. For best results, though, an inoculum of the correct strain of bacteria should be mixed with the soybean (or any legume) seed before planting. Modern crop cultivars generally reach a height of around , and take 80–120 days from sowing to harvesting.


Soils

Soil scientists Edson Lobato (Brazil), Andrew McClung (U.S.), and Alysson Paolinelli (Brazil) were awarded the 2006 World Food Prize for transforming the ecologically biodiverse savannah of the
Cerrado The ''Cerrado'' (, ) is a vast ecoregion of tropical savanna in eastern Brazil, particularly in the states of Goiás, Mato Grosso do Sul, Mato Grosso, Tocantins, Minas Gerais, and the Federal District. The core areas of the Cerrado biome are th ...
region of Brazil into highly productive cropland that could grow profitable soybeans.


Contamination concerns

Human sewage sludge can be used as fertilizer to grow soybeans. Soybeans grown in sewage sludge likely contain elevated concentrations of metals.


Pests

Soybean plants are vulnerable to a wide range of bacterial diseases, fungal diseases, viral diseases and parasites.


Bacteria

The primary bacterial diseases include
bacterial blight Blight refers to a specific symptom affecting plants in response to infection by a pathogenic organism. Description Blight is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organ ...
, bacterial pustule and downy mildew affecting the soybean plant.


Animals


=Nematodes

= Soybean cyst nematode is the worst pest of soybean in the US. Losses of 30% or 40%“You can literally have 40% yield loss with no symptoms,” says Greg Tylka, Iowa State University (ISU) Extension nematologist. are common even without symptoms.


=Arthropods

=


Insects

The corn earworm moth and bollworm is a common and destructive pest of soybean growth in Virginia.


=Vertebrates

=


Mammals

Soybeans are consumed by whitetail deer which may damage soybean plants through feeding, trampling and bedding, reducing
crop yield In agriculture, the yield is a measurement of the amount of a crop grown, or product such as wool, meat or milk produced, per unit area of land. The seed ratio is another way of calculating yields. Innovations, such as the use of fertilizer, the c ...
s by as much as 15%. Groundhogs are also a common pest in soybean fields, living in burrows underground and feeding nearby. One den of groundhogs can consume a tenth to a quarter of an acre of soybeans. Chemical repellents or firearms are effective for controlling pests in soybean fields.


Fungi

Soybeans suffer from ''
Pythium spinosum ''Pythium spinosum'' is a plant pathogen infecting a wide variety of crops. Hosts observed to by infected include rice in Taiwan, '' Primula'', ''Impatiens'', soil in Florida, ''Cucumis melo'' in South Korea (as damping off), and soybeans in Arka ...
'' in
Arkansas Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage la ...
and Indiana ( United States), and China.


Cultivars


Disease resistant cultivars

Resistant varieties are available.


=PI 88788

= The vast majority of cultivars in the US have SCN resistance, but rely on only one breeding line (PI 88788) as their sole source of resistance.Reliance on the main genetic source of SCN resistance (PI 88788)may be helping SCN to overcome SCN-resistant varieties. Out of 807 resistant varieties listed by ISU this year, just 18 had a genetic background outside of PI 88788. “We have lots of varieties to pick from, but the genetic background is not as diverse as we would like it to be,” says Tylka. (The resistance genes provided by PI 88788, Peking, and PI 90763 were characterized in 1997.) As a result, for example, in 2012 only 18 cultivars out of 807 recommended by the
Iowa State University Extension Iowa State University of Science and Technology (Iowa State University, Iowa State, or ISU) is a public land-grant research university in Ames, Iowa. Founded in 1858 as the Iowa Agricultural College and Model Farm, Iowa State became one of th ...
had any ancestry outside of PI 88788. By 2020 the situation was still about the same: Of 849 there were 810 with some ancestry from PI 88788, 35 from Peking, and only 2 from PI 89772. (On the question of exclusively PI 88788 ancestry, that number was not available for 2020.) That was speculated to be in 2012There have been cases where SCN has clipped yields of SCN-resistant varieties. Reliance on the main genetic source of SCN resistance (PI 88788)may be helping SCN to overcome SCN-resistant varieties.—and was clearly by 2020—producing SCN populations that are virulent on PI 88788.


Production

In 2020, world production of soybeans was over 353 million tonnes, led by Brazil and the United States combined with 66% of the total (table). Production has dramatically increased across the globe since the 1960s, but particularly in South America after a cultivar that grew well in low latitudes was developed in the 1980s. The rapid growth of the industry has been primarily fueled by large increases in worldwide demand for meat products, particularly in developing countries like China, which alone accounts for more than 60% of imports.


Environmental issues

In spite of the Amazon "Soy Moratorium", soy production continues to play a significant role in deforestation when its indirect impacts are taken into account, as land used to grow soy continues to increase. This land either comes from
pasture Pasture (from the Latin ''pastus'', past participle of ''pascere'', "to feed") is land used for grazing. Pasture lands in the narrow sense are enclosed tracts of farmland, grazed by domesticated livestock, such as horses, cattle, sheep, or swin ...
land (which increasingly supplants forested areas), or areas outside the Amazon not covered by the moratorium, such as the
Cerrado The ''Cerrado'' (, ) is a vast ecoregion of tropical savanna in eastern Brazil, particularly in the states of Goiás, Mato Grosso do Sul, Mato Grosso, Tocantins, Minas Gerais, and the Federal District. The core areas of the Cerrado biome are th ...
region. Roughly one-fifth of deforestation can be attributed to expanding land use to produce oilseeds, primarily for soy and palm oil, whereas the expansion of
beef Beef is the culinary name for meat from cattle (''Bos taurus''). In prehistoric times, humankind hunted aurochs and later domesticated them. Since that time, numerous breeds of cattle have been bred specifically for the quality or quantity ...
production accounts for 41%. The main driver of deforestation is the global demand for meat, which in turn requires huge tracts of land to grow feed crops for livestock. Around 80% of the global soybean crop is used to feed livestock.


History

Soybeans were a crucial crop in East Asia long before written records began. The origin of soy bean cultivation remains scientifically debated. The closest living relative of the soybean is ''
Glycine soja ''Glycine soja'', or wild soybean (previously ''G. ussuriensis'') is an annual plant in the legume family. It is the closest living relative of soybean The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native ...
'' (previously called ''G. ussuriensis''), a legume native to central China. There is evidence for soybean domestication between 7000 and 6600 BC in China, between 5000 and 3000 BC in Japan and 1000 BC in Korea. The first unambiguously domesticated,
cultigen A cultigen () or cultivated plant is a plant that has been deliberately altered or selected by humans; it is the result of artificial selection. These plants, for the most part, have commercial value in horticulture, agriculture or forestry. Bec ...
-sized soybean was discovered in Korea at the
Mumun The Mumun pottery period is an archaeological era in Korean prehistory that dates to approximately 1500-300 BC. This period is named after the Korean name for undecorated or plain cooking and storage vessels that form a large part of the pottery ...
-period Daundong site. Prior to
fermented Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. In biochemistry, it is narrowly defined as the extraction of energy from carbohydrates in the absence of oxygen. In food p ...
products such as fermented black soybeans (''
douchi ''Douchi'' () or ''tochi'' (also known as fermented black soybeans, Chinese fermented black beans (), salted black beans, salty black beans, or just black beans) is a type of fermented and salted black soybean most popular in the cuisine of ...
''), ''jiang'' (Chinese miso), soy sauce,
tempeh Tempeh or tempe (; jv, ꦠꦺꦩ꧀ꦥꦺ, témpé, ) is a traditional Indonesian food made from fermented soybeans. It is made by a natural culturing and controlled fermentation process that binds soybeans into a cake form. A fungus, '' Rhizo ...
,
nattō , spelled as natto in standard English language use, is a traditional Japanese food made from whole soybeans that have been fermented with ''Bacillus subtilis'' var. ''natto''. It is often served as a breakfast food with rice. It is served wit ...
, and
miso is a traditional Japanese seasoning. It is a thick paste produced by fermenting soybeans with salt and ''kōji'' (the fungus ''Aspergillus oryzae'') and sometimes rice, barley, seaweed, or other ingredients. It is used for sauces and sprea ...
, soy was considered sacred for its beneficial effects in
crop rotation Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. It reduces reliance on one set of nutrients, pest and weed pressure, and the probability of developing resistant ...
, and it was eaten by itself, and as
bean curd A bean is the seed of several plants in the family Fabaceae, which are used as vegetables for human or animal food. They can be cooked in many different ways, including boiling, frying, and baking, and are used in many traditional dishes thr ...
and soy milk. Soybeans were introduced to Java in Malay Archipelago circa 13th century or probably earlier. By the 17th century through their trade with Far East, soybeans and its products were traded by European traders (Portuguese, Spanish, and Dutch) in Asia, and reached Indian Subcontinent by this period. By the 18th century, soybeans were introduced to the Americas and Europe from China. Soy was introduced to Africa from China in the late 19th century, and is now widespread across the continent.


East Asia

The cultivation of soybeans began in the eastern half of northern China by 2000 BC, but is almost certainly much older. The earliest documented evidence for the use of Glycine of any kind comes from charred plant remains of wild soybean recovered from Jiahu in Henan province China, a Neolithic site occupied between 9000 and 7800 calendar years ago (cal bp). An abundance of archeological charred soybean specimens have been found centered around this region. According to the ancient Chinese myth, in 2853 BC, the legendary Emperor Shennong of China proclaimed that five plants were sacred: soybeans, rice, wheat, barley, and
millet Millets () are a highly varied group of small-seeded grasses, widely grown around the world as cereal crops or grains for fodder and human food. Most species generally referred to as millets belong to the tribe Paniceae, but some millets also ...
. Early Chinese records mention that soybeans were a gift from the region of
Yangtze River delta The Yangtze Delta or Yangtze River Delta (YRD, or simply ) is a triangle-shaped megalopolis generally comprising the Wu Chinese-speaking areas of Shanghai, southern Jiangsu and northern Zhejiang. The area lies in the heart of the Jiangnan re ...
and Southeast China.The History of Agriculture By Britannica Educational Publishing, p. 48 The '' Great Soviet Encyclopedia'' claims soybean cultivation originated in China about 5000 years ago. Some scholars suggest that soybean originated in China and was domesticated about 3500 BC. Recent research, however, indicates that seeding of wild forms started early (before 5000 BC) in multiple locations throughout East Asia. The oldest preserved soybeans resembling modern varieties in size and shape were found in
archaeological site An archaeological site is a place (or group of physical sites) in which evidence of past activity is preserved (either prehistoric or historic or contemporary), and which has been, or may be, investigated using the discipline of archaeology and ...
s in Korea dated about 1000 BC. Radiocarbon dating of soybean samples recovered through flotation during excavations at the Early
Mumun The Mumun pottery period is an archaeological era in Korean prehistory that dates to approximately 1500-300 BC. This period is named after the Korean name for undecorated or plain cooking and storage vessels that form a large part of the pottery ...
period Okbang site in Korea indicated soybean was cultivated as a food crop in around 1000–900 BC. Soybeans from the Jōmon period in Japan from 3000 BC are also significantly larger than wild varieties. Soybeans became an important crop by the Zhou Dynasty (c. 1046–256 BC) in China. However, the details of where, when, and under what circumstances soybean developed a close relationship with people are poorly understood. Soybean was unknown in South China before the Han period. From about the first century AD to the
Age of Discovery The Age of Discovery (or the Age of Exploration), also known as the early modern period, was a period largely overlapping with the Age of Sail, approximately from the 15th century to the 17th century in European history, during which seafaring ...
(15–16th centuries), soybeans were introduced into across South and Southeast Asia. This spread was due to the establishment of sea and land trade routes. The earliest Japanese textual reference to the soybean is in the classic '' Kojiki'' (''Records of Ancient Matters''), which was completed in AD 712.


Southeast Asia

Soybeans were mentioned as ''kadêlê'' (modern
Indonesian Indonesian is anything of, from, or related to Indonesia, an archipelagic country in Southeast Asia. It may refer to: * Indonesians, citizens of Indonesia ** Native Indonesians, diverse groups of local inhabitants of the archipelago ** Indonesian ...
term: ) in an
old Javanese Old Javanese or Kawi is the oldest attested phase of the Javanese language. It was spoken in the eastern part of what is now Central Java and the whole of East Java, Indonesia. As a literary language, Kawi was used across Java and on the island ...
manuscript, Serat
Sri Tanjung Sri Tanjung, also known as the tale of Banyuwangi ( Javanese for "fragrant water"), is a Javanese folktale about a faithful wife who was wrongfully accused. The story has been popular since the era of the Majapahit kingdom. The story is usually ...
, which dates to 12th- to 13th-century Java. By the 13th century, the soybean had arrived and cultivated in Indonesia; it probably arrived much earlier however, carried by traders or merchants from Southern China. The earliest known reference to it as "
tempeh Tempeh or tempe (; jv, ꦠꦺꦩ꧀ꦥꦺ, témpé, ) is a traditional Indonesian food made from fermented soybeans. It is made by a natural culturing and controlled fermentation process that binds soybeans into a cake form. A fungus, '' Rhizo ...
" appeared in 1815 in the
Serat Centhini ''Serat Centhini'' is a twelve volume compilation of Javanese tales and teachings, written in verse and published in 1814. The work was commissioned, directed and partially written by Crown Prince Mangkunegoro, later enthroned as Pakubuwono V of ...
manuscript. The development of tempeh fermented soybean cake probably took place earlier, circa 17th century in Java.


Indian subcontinent

By the 1600s, soy sauce spread from southern Japan across the region through the
Dutch East India Company The United East India Company ( nl, Verenigde Oostindische Compagnie, the VOC) was a chartered company established on the 20th March 1602 by the States General of the Netherlands amalgamating existing companies into the first joint-stock co ...
(VOC). The soybean probably arrived from southern China, moving southwest into northern parts of Indian subcontinent by this period.


Iberia

In 1603, " Vocabvlario da Lingoa de Iapam", a famous Japanese-Portuguese dictionary, was compiled and published by Jesuit priests in Nagasaki. It contains short but clear definitions for about 20 words related to soyfoods—the first in any European language. The Luso-Hispanic traders were familiar with soybeans and soybean product through their trade with Far East since at least the 17th century. However, it was not until the late 19th century that the first attempt to cultivate soybeans in the Iberian peninsula was undertaken. In 1880, the soybean was first cultivated in Portugal in the Botanical Gardens at Coimbra (Crespi 1935). In about 1910 in Spain the first attempts at Soybean cultivation were made by the Count of San Bernardo, who cultivated soybeans on his estates at Almillo (in southwest Spain) about 48 miles east-northeast of Seville.


North America

Soybeans were first introduced to North America from China in 1765, by
Samuel Bowen Samuel Bowen (died 30 December 1777) was an English entrepreneur and farmer who established an estate in Savannah, Georgia, where he cultivated the first soya beans in North America. While earlier sources credited Benjamin Franklin with the i ...
, a former East India Company sailor who had visited China in conjunction with James Flint, the first Englishman legally permitted by the Chinese authorities to learn Chinese. The first "New World" soybean crop was grown on Skidaway Island, Georgia, in 1765 by Henry Yonge from seeds given him by Samuel Bowen. Bowen grew soy near Savannah, Georgia, possibly using funds from Flint, and made soy sauce for sale to England. Although soybean was introduced into North America in 1765, for the next 155 years, the crop was grown primarily for
forage Forage is a plant material (mainly plant leaves and stems) eaten by grazing livestock. Historically, the term ''forage'' has meant only plants eaten by the animals directly as pasture, crop residue, or immature cereal crops, but it is also used m ...
. In 1831, the first soy product "a few dozen India Soy"
auce Auce (; lt, Aukė; german: Alt-Autz) is a town in southern Latvia, Dobele Municipality near the Lithuanian border. History Before 13th century the territory of Auce was a part of a Semigallian Spārnene county. After the partition of Semigal ...
arrived in Canada. Soybeans were probably first cultivated in Canada by 1855, and definitely in 1895 at Ontario Agricultural College. It was not until
Lafayette Mendel Lafayette Benedict Mendel (February 5, 1872 – December 9, 1935) was an American biochemist known for his work in nutrition, with longtime collaborator Thomas B. Osborne, including the study of Vitamin A, Vitamin B, lysine and tryptophan. ...
and Thomas Burr Osborne showed that the nutritional value of soybean seeds could be increased by cooking, moisture or heat, that soy went from a farm animal feed to a human food. William Morse is considered the "father" of modern soybean agriculture in America. He and
Charles Piper Charles Vancouver Piper (16 June 1867 – 11 February 1926) was an American botanist and agriculturalist. Born in Victoria, British Columbia, Canada, he spent his youth in Seattle, Washington Territory and graduated from the University of Washing ...
(Dr. C. V. Piper) took what was an unknown Oriental peasant crop in 1910 and transformed it into a "golden bean" for America, becoming one of America's largest farm crops and its most nutritious. Prior to the 1920 in the US, the soybean was mainly a
forage Forage is a plant material (mainly plant leaves and stems) eaten by grazing livestock. Historically, the term ''forage'' has meant only plants eaten by the animals directly as pasture, crop residue, or immature cereal crops, but it is also used m ...
crop, a source of oil, meal (for feed) and industrial products, with very little used as food. However, it took on an important role after World War I. During the Great Depression, the drought-stricken (
Dust Bowl The Dust Bowl was a period of severe dust storms that greatly damaged the ecology and agriculture of the American and Canadian prairies during the 1930s. The phenomenon was caused by a combination of both natural factors (severe drought) an ...
) regions of the United States were able to use soy to regenerate their soil because of its nitrogen-fixing properties. Farms were increasing production to meet with government demands, and Henry Ford became a promoter of soybeans. In 1931, Ford hired chemists Robert Boyer and Frank Calvert to produce
artificial silk Artificial silk or art silk is any synthetic fiber which resembles silk, but typically costs less to produce. Frequently, "artificial silk" is just a synonym for rayon. When made out of bamboo viscose it is also sometimes called bamboo silk. The ...
. They succeeded in making a textile fiber of spun soy protein fibers, hardened or tanned in a formaldehyde bath, which was given the name Azlon. It never reached the commercial market. Soybean oil was used by
Ford Ford commonly refers to: * Ford Motor Company, an automobile manufacturer founded by Henry Ford * Ford (crossing), a shallow crossing on a river Ford may also refer to: Ford Motor Company * Henry Ford, founder of the Ford Motor Company * Ford F ...
in paint for the automobiles, as well as a fluid for shock absorbers. Prior to the 1970s, Asian-Americans and Seventh-Day Adventists were essentially the only users of soy foods in the United States. "The soy foods movement began in small pockets of the counterculture, notably the Tennessee commune named simply The Farm, but by the mid-1970s a vegetarian revival helped it gain momentum and even popular awareness through books such as ''The Book of Tofu''." Although practically unseen in 1900, by 2000 soybean plantings covered more than 70 million acres, second only to corn, and it became America's largest cash crop. In 2021, 87,195 acres were planted, with the largest acreage in the states of Illinois, Iowa, and Minnesota.


Caribbean and West Indies

The soybean arrived in the Caribbean in the form of soy sauce made by Samuel Bowen in Savannah, Georgia, in 1767. It remains only a minor crop there, but its uses for human food are growing steadily.


Mediterranean area

The soybean was first cultivated in Italy by 1760 in the Botanical Garden of Turin. During the 1780s, it was grown in at least three other botanical gardens in Italy. The first soybean product, soy oil, arrived in Anatolia during 1909 under Ottoman Empire. The first clear cultivation occurred in 1931. This was also the first time that soybeans were cultivated in Middle East. By 1939, soybeans were cultivated in Greece.


Australia

Wild soybeans were discovered in northeastern Australia in 1770 by explorers Banks and Solander. In 1804, the first soyfood product ("Fine India Soy"
auce Auce (; lt, Aukė; german: Alt-Autz) is a town in southern Latvia, Dobele Municipality near the Lithuanian border. History Before 13th century the territory of Auce was a part of a Semigallian Spārnene county. After the partition of Semigal ...
was sold in Sydney. In 1879, the first domesticated soybeans arrived in Australia, a gift of the Minister of the Interior Department, Japan.


Western Europe

The soybean was first cultivated in France by 1779 (and perhaps as early as 1740). The two key early people and organizations introducing the soybean to France were the Society of Acclimatization (starting in 1855) and Li Yu-ying (from 1910). Li started a large tofu factory, where the first commercial soyfoods in France were made.


Africa

The soybean first arrived in Africa via Egypt in 1857. Soya Meme (Baked Soya) is produced in the village called Bame Awudome near Ho, the capital of the
Volta Region Volta Region (or Volta) is one of Ghana's sixteen administrative regions, with Ho designated as its capital. It is located west of Republic of Togo and to the east of Lake Volta. Divided into 25 administrative districts, the region is multi-e ...
of Ghana, by the
Ewe people The Ewe people (; ee, Eʋeawó, lit. "Ewe people"; or ''Mono Kple Volta Tɔ́sisiwo Dome'', lit. "Ewe nation","Eʋenyigba" Eweland;) are a Gbe-speaking ethnic group. The largest population of Ewe people is in Ghana (6.0 million), and the second ...
of Southeastern Ghana and southern Togo.


Central Europe

In 1873, Professor Friedrich J. Haberlandt first became interested in soybeans when he obtained the seeds of 19 soybean varieties at the
Vienna World Exposition The 1873 Vienna World's Fair (german: Weltausstellung 1873 Wien) was the large world exposition that was held in 1873 in the Austria-Hungarian capital Vienna. Its motto was "Culture and Education" (). History As well as being a chance to showca ...
(Wiener Weltausstellung). He cultivated these seeds in Vienna, and soon began to distribute them throughout Central and Western Europe. In 1875, he first grew the soybeans in Vienna, then in early 1876 he sent samples of seeds to seven cooperators in central Europe, who planted and tested the seeds in the spring of 1876, with good or fairly good results in each case.Shurtleff, W.; Aoyagi, A. 2015. "History of Soybeans and Soyfoods in Austria and Switzerland (1781–2015)." Lafayette, California: Soyinfo Center. 705 pp. (1444 references; 128 photos and illustrations). Free online. . Most of the farmers who received seeds from him cultivated them, then reported their results. Starting in February 1876, he published these results first in various journal articles, and finally in his ''magnum opus'', Die Sojabohne (The Soybean) in 1878. In northern Europe,
lupin ''Lupinus'', commonly known as lupin, lupine, or regionally bluebonnet etc., is a genus of plants in the legume family Fabaceae. The genus includes over 199 species, with centers of diversity in North and South America. Smaller centers occur ...
(lupine) is known as the "soybean of the north".


Central Asia

The soybean is first in cultivated Transcaucasia in Central Asia in 1876, by the Dungans. This region has never been important for soybean production.


Central America

The first reliable reference to the soybean in this region dates from Mexico in 1877.


South America

The soybean first arrived in South America in Argentina in 1882. Andrew McClung showed in the early 1950s that with soil amendments the
Cerrado The ''Cerrado'' (, ) is a vast ecoregion of tropical savanna in eastern Brazil, particularly in the states of Goiás, Mato Grosso do Sul, Mato Grosso, Tocantins, Minas Gerais, and the Federal District. The core areas of the Cerrado biome are th ...
region of Brazil would grow soybeans. In June 1973, when soybean futures markets mistakenly portended a major shortage, the Nixon administration imposed an embargo on soybean exports. It lasted only a week, but Japanese buyers felt that they could not rely on U.S. supplies, and the rival Brazilian soybean industry came into existence. This led Brazil to become the world's largest producer of soybeans in 2020, with 131 million tons.


Genetics

Chinese landraces were found to have a slightly higher diversity than inbred lines by Li et al. 2010. Specific locus amplified fragment sequencing ( SLAF-seq) has been used by Han et al. 2015 to study the genetic history of the domestication process, perform genome-wide association studies (GWAS) of agronomically relevant traits, and produce high-density linkage maps. An
SNP array In molecular biology, SNP array is a type of DNA microarray which is used to detect polymorphisms within a population. A single nucleotide polymorphism (SNP), a variation at a single site in DNA, is the most frequent type of variation in the g ...
was developed by Song et al. 2013 and has been used for research and
breeding Breeding is sexual reproduction that produces offspring, usually animals or plants. It can only occur between a male and a female animal or plant. Breeding may refer to: * Animal husbandry, through selected specimens such as dogs, horses, and rab ...
; the same team applied their array in Song et al. 2015 against the USDA Soybean Germplasm Collection and obtained mapping data that are expected to yield association mapping data for such traits.


Genetic modification

Soybeans are one of the "
biotech Biotechnology is the integration of natural sciences and engineering sciences in order to achieve the application of organisms, cells, parts thereof and molecular analogues for products and services. The term ''biotechnology'' was first used ...
food" crops that have been genetically modified, and genetically modified soybeans are being used in an increasing number of products. In 1995, Monsanto company introduced glyphosate-tolerant soybeans that have been genetically modified to be resistant to Monsanto's glyphosate herbicides through substitution of the ''
Agrobacterium ''Agrobacterium'' is a genus of Gram-negative bacteria established by H. J. Conn that uses horizontal gene transfer to cause tumors in plants. ''Agrobacterium tumefaciens'' is the most commonly studied species in this genus. ''Agrobacterium ...
sp.'' (strain CP4) gene EPSP (5-enolpyruvyl shikimic acid-3-phosphate) synthase. The substituted version is not sensitive to glyphosate. In 1997, about 8% of all soybeans cultivated for the commercial market in the United States were genetically modified. In 2010, the figure was 93%. As with other glyphosate-tolerant crops, concern is expressed over damage to
biodiversity Biodiversity or biological diversity is the variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic (''genetic variability''), species (''species diversity''), and ecosystem (''ecosystem diversity'') le ...
. A 2003 study concluded the "Roundup Ready" (RR) gene had been bred into so many different soybean cultivars, there had been little decline in genetic diversity, but "diversity was limited among elite lines from some companies". The widespread use of such types of GM soybeans in the Americas has caused problems with exports to some regions. GM crops require extensive certification before they can be legally imported into the European Union, where there is considerable supplier and consumer reluctance to use GM products for consumer or animal use. Difficulties with coexistence and subsequent traces of cross-contamination of non-GM stocks have caused shipments to be rejected and have put a premium on non-GM soy. A 2006 United States Department of Agriculture report found the adoption of genetically engineered (GE) soy, corn and cotton reduced the amount of pesticides used overall, but did result in a slightly greater amount of herbicides used for soy specifically. The use of GE soy was also associated with greater
conservation tillage Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shoveling, picking, mattock work, hoeing, ...
, indirectly leading to better soil conservation, as well as increased income from off-farming sources due to the greater ease with which the crops can be managed. Though the overall estimated benefits of the adoption of GE soybeans in the United States was $310 million, the majority of this benefit was experienced by the companies selling the seeds (40%), followed by biotechnology firms (28%) and farmers (20%). The patent on glyphosate-tolerant soybeans expired in 2014, so benefits can be expected to shift. In 2010, a team of American scientists announced they had sequenced the soybean genome—the first legume to be sequenced.


Uses

Among the legumes, the soybean is valued for its high (38–45%) protein content as well as its high (approximately 20%) oil content. Soybeans are the most valuable agricultural export of the United States. Approximately 85% of the world's soybean crop is processed into soybean meal and soybean oil, the remainder processed in other ways or eaten whole. Soybeans can be broadly classified as "vegetable" (garden) or field (oil) types. Vegetable types cook more easily, have a mild, nutty flavor, better texture, are larger in size, higher in protein, and lower in oil than field types. Tofu, soy milk and soy sauce are among the top edible commodities made using soybeans. Producers prefer the higher protein cultivars bred from vegetable soybeans originally brought to the United States in the late 1930s. The "garden" cultivars are generally not suitable for mechanical combine harvesting because there is a tendency for the pods to shatter upon reaching maturity.


Soybean oil

Soybean seed contains 18–19% oil. To extract soybean oil from seed, the soybeans are cracked, adjusted for moisture content, rolled into flakes and solvent-extracted with commercial hexane. The oil is then refined, blended for different applications, and sometimes hydrogenated. Soybean oils, both liquid and partially hydrogenated, are exported abroad, sold as "vegetable oil", or end up in a wide variety of processed foods.


Soybean meal

Soybean meal, or soymeal, is the material remaining after solvent extraction of oil from soybean flakes, with a 50% soy protein content. The meal is 'toasted' (a
misnomer A misnomer is a name that is incorrectly or unsuitably applied. Misnomers often arise because something was named long before its correct nature was known, or because an earlier form of something has been replaced by a later form to which the name ...
because the heat treatment is with moist steam) and ground in a
hammer mill A hammer mill, hammer forge or hammer works was a workshop in the pre-industrial era that was typically used to manufacture semi-finished, wrought iron products or, sometimes, finished agricultural or mining tools, or military weapons. The featur ...
. Ninety-seven percent of soybean meal production globally is used as livestock feed. Soybean meal is also used in some
dog food Dog food is food specifically formulated and intended for consumption by dogs and other related canines. Dogs are considered to be omnivores with a carnivorous bias. They have the sharp, pointed teeth and shorter gastrointestinal tracts of ca ...
s.


Livestock feed

One of the major uses of soybeans globally is as livestock feed, predominantly in the form of soybean meal. In the European Union, for example, though it does not make up most of the weight of livestock feed, soybean meal provides around 60% of the protein fed to livestock. Spring grasses are rich in omega-3 fatty acids, whereas soy is predominantly omega-6. The soybean hulls, which mainly consist of the outer coats of the beans removed before oil extraction, can also be fed to livestock, as well as whole soybean seeds after processing.


Food for human consumption

In addition to their use in livestock feed, soybean products are widely used for human consumption. Common soybean products include soy sauce, soy milk, tofu, soy meal, soy flour,
textured vegetable protein Textured or texturized vegetable protein (TVP), also known as textured soy protein (TSP), soy meat, or soya chunks is a defatted soy flour product, a by-product of extracting soybean oil. It is often used as a meat analogue or meat extender. ...
(TVP), soy curls,
tempeh Tempeh or tempe (; jv, ꦠꦺꦩ꧀ꦥꦺ, témpé, ) is a traditional Indonesian food made from fermented soybeans. It is made by a natural culturing and controlled fermentation process that binds soybeans into a cake form. A fungus, '' Rhizo ...
, soy
lecithin Lecithin (, from the Greek ''lekithos'' "yolk") is a generic term to designate any group of yellow-brownish fatty substances occurring in animal and plant tissues which are amphiphilic – they attract both water and fatty substances (and so ar ...
and soybean oil. Soybeans may also be eaten with minimal processing, for example in the Japanese food , in which immature soybeans are boiled whole in their pods and served with salt. In China, Japan, and Korea, soybean and soybean products are a common part of the diet. Tofu (豆腐 ''dòufu'') is thought to have originated in China, along with soy sauce and several varieties of
soybean paste Fermented bean paste is a category of fermented foods typically made from ground soybeans, which are indigenous to the cuisines of East, South and Southeast Asia. In some cases, such as the production of ''miso'', other varieties of beans, such a ...
used as seasonings. Japanese foods made from soya include ''
miso is a traditional Japanese seasoning. It is a thick paste produced by fermenting soybeans with salt and ''kōji'' (the fungus ''Aspergillus oryzae'') and sometimes rice, barley, seaweed, or other ingredients. It is used for sauces and sprea ...
'' (), ''
nattō , spelled as natto in standard English language use, is a traditional Japanese food made from whole soybeans that have been fermented with ''Bacillus subtilis'' var. ''natto''. It is often served as a breakfast food with rice. It is served wit ...
'' (), ''
kinako ''Kinako'' ( or ) is roasted soybean flour, a product commonly used in Japanese cuisine. In English, it is usually called "roasted soy flour". More precisely it is "roasted whole soy flour". Usage of the word ''kinako'' appeared in cookbooks fr ...
'' () and ''edamame'' (), as well as products made with tofu such as
atsuage is a Japanese food product made from twice-fried soybeans. It is produced by cutting tofu into thin slices and deep-frying them first at 110–120 °C, and then again at 180–200 °C. ''Abura-age'' is often used to wrap , and is added to mis ...
and
aburaage is a Japanese food product made from twice-fried soybeans. It is produced by cutting tofu into thin slices and deep-frying them first at 110–120 °C, and then again at 180–200 °C. ''Abura-age'' is often used to wrap , and is added to mis ...
. In China, whole dried soybeans are sold in supermarkets and used to cook a variety of dishes, usually after rehydration by soaking in water; they find their use in soup or as a savory dish. In Korean cuisine, soybean sprouts ( 콩나물 ''
kongnamul Soybean sprout is a culinary vegetable grown by sprouting soybeans. It can be grown by placing and watering the sprouted soybeans in the shade until the roots grow long. Soybean sprouts are extensively cultivated and consumed in Asian countries. ...
'') are used in a variety of dishes, and soybeans are the base ingredient in ''
doenjang ''Doenjang'' * (; "thick sauce") or soybean paste is a type of fermented bean paste made entirely of soybean and brine. It is also a byproduct of soup soy sauce production. It is sometimes used as a relish. History The earliest soybean fer ...
'', ''
cheonggukjang Cheonggukjang () is a traditional Korean food made by fermenting soybeans. It contains whole, as well as ground soybeans. Production It can be made in two to three days through fermentation of boiled soybeans, adding ''Bacillus subtilis'', wh ...
'' and ''ganjang''. In Vietnam, soybeans are used to make soybean paste ('' tương'') in the North with the most popular products are ''tương Bần'', ''tương Nam Đàn'', ''tương Cự Đà'' as a garnish for '' phở'' and '' gỏi cuốn'' dishes, as well as tofu ( or or ), soy sauce (), soy milk ( in the North or in the South), and (tofu sweet soup).


Flour

Soy flour refers to soybeans ground finely enough to pass through a 100-mesh or smaller screen where special care was taken during desolventizing (not toasted) to minimize denaturation of the protein to retain a high protein dispersibility index, for uses such as
food extrusion Extrusion in food processing consists of forcing soft mixed ingredients through an opening in a perforated plate or die designed to produce the required shape. The extruded food is then cut to a specific size by blades. The machine which forces ...
of
textured vegetable protein Textured or texturized vegetable protein (TVP), also known as textured soy protein (TSP), soy meat, or soya chunks is a defatted soy flour product, a by-product of extracting soybean oil. It is often used as a meat analogue or meat extender. ...
. It is the starting material for production of soy concentrate and soy protein isolate. Soy flour can also be made by roasting the soybean, removing the coat (hull), and grinding into a flour. Soy flour is manufactured with different fat levels. Alternatively, raw soy flour omits the roasting step. * Defatted soy flour is obtained from solvent
extracted ''Extracted'', also known as ''Extraction'' in the UK, is an independent 2012 American science fiction thriller directed and written by Nir Paniry. Sasha Roiz stars as a scientist whose consciousness becomes trapped in the mind of a convict (Domi ...
flakes, and contains less than 1% oil. * "Natural or full-fat soy flour is made from unextracted, dehulled beans, and contains about 18% to 20% oil." Its high oil content requires the use of a specialized Alpine Fine Impact Mill to grind rather than the usual
hammer mill A hammer mill, hammer forge or hammer works was a workshop in the pre-industrial era that was typically used to manufacture semi-finished, wrought iron products or, sometimes, finished agricultural or mining tools, or military weapons. The featur ...
. Full-fat soy flour has a lower protein concentration than defatted flour. Extruded Full-Fat soy flour, ground in an Alpine mill, can replace/extend EGGS in baking and cooking Full-fat soy flour is a component of the famous Cornell bread recipe (think pizza) * Low-fat soy flour is made by adding some oil back into defatted soy flour. Fat levels range from 4.5% to 9%. * High-fat soy flour can also be produced by adding back soybean oil to defatted flour, usually at the level of 15%.
Soy lecithin Lecithin (, from the Greek ''lekithos'' "yolk") is a generic term to designate any group of yellow-brownish fatty substances occurring in animal and plant tissues which are amphiphilic – they attract both water and fatty substances (and so ar ...
can be added (up to 15%) to soy flour to make lecithinated soy flour. It increases dispersibility and gives it emulsifying properties. Soy flour has 50% protein and 5% fiber. It has higher levels of protein, thiamine, riboflavin, phosphorus, calcium, and iron than
wheat flour Wheat flour is a powder made from the grinding of wheat used for human consumption. Wheat varieties are called "soft" or "weak" if gluten content is low, and are called "hard" or "strong" if they have high gluten content. Hard flour, or ''bread ...
. It does not contain gluten. As a result, yeast-raised
bread Bread is a staple food prepared from a dough of flour (usually wheat) and water, usually by baking. Throughout recorded history and around the world, it has been an important part of many cultures' diet. It is one of the oldest human-made food ...
s made with soy flour are dense in texture. Among many uses, soy flour thickens sauces, prevents
staling Staling, or "going stale", is a chemical and physical process in bread and similar foods that reduces their palatability - stale bread is dry and hard. Mechanism and effects Staling is not simply a drying-out process due to evaporation. One im ...
in baked food, and reduces oil absorption during frying. Baking food with soy flour gives it tenderness, moistness, a rich color, and a fine texture. Soy grits are similar to soy flour except the soybeans have been toasted and cracked into coarse pieces. ''
Kinako ''Kinako'' ( or ) is roasted soybean flour, a product commonly used in Japanese cuisine. In English, it is usually called "roasted soy flour". More precisely it is "roasted whole soy flour". Usage of the word ''kinako'' appeared in cookbooks fr ...
'' is a soy flour used in Japanese cuisine.


Soy-based infant formula

Soy-based
infant formula Infant formula, baby formula, or simply formula (American English); or baby milk, infant milk or first milk (British English), is a manufactured food designed and marketed for feeding to babies and infants under 12 months of age, usually prepar ...
(SBIF) is sometimes given to infants who are not being strictly breastfed; it can be useful for infants who are either allergic to pasteurized cow milk proteins or who are being fed a
vegan Veganism is the practice of abstaining from the use of animal product—particularly in diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan. ...
diet. It is sold in powdered, ready-to-feed, and concentrated liquid forms. Some reviews have expressed the opinion that more research is needed to determine what effect the phytoestrogens in soybeans may have on infants. Diverse studies have concluded there are no adverse effects in human growth, development, or reproduction as a result of the consumption of soy-based infant formula. One of these studies, published in the ''
Journal of Nutrition ''The Journal of Nutrition'' (or shortened as '' JN'' or '' J Nutr'') is a peer-reviewed scientific journal published by the American Society for Nutrition. Established in 1928, the journal publishes experimental research on human, animal, cellul ...
'', concludes that there are:
... no clinical concerns with respect to nutritional adequacy, sexual development, neurobehavioral development, immune development, or thyroid disease. SBIFs provide complete nutrition that adequately supports normal infant growth and development. FDA has accepted SBIFs as safe for use as the sole source of nutrition.


Meat and dairy alternatives and extenders

Soybeans can be processed to produce a texture and appearance similar to many other foods. For example, soybeans are the primary ingredient in many dairy product substitutes (e.g., soy milk,
margarine Margarine (, also , ) is a spread used for flavoring, baking, and cooking. It is most often used as a substitute for butter. Although originally made from animal fats, most margarine consumed today is made from vegetable oil. The spread was or ...
, soy ice cream, soy yogurt, soy cheese, and soy cream cheese) and meat alternatives (e.g.
veggie burgers A veggie burger is a hamburger patty that does not contain meat. It may be made from ingredients like beans, especially soybeans and tofu, nuts, grains, seeds or fungi such as mushrooms or mycoprotein. The patties that are the essence of a v ...
). These substitutes are readily available in most supermarkets. Soy milk does not naturally contain significant amounts of digestible
calcium Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar ...
. Many manufacturers of soy milk sell calcium-enriched products, as well. Soy products also are used as a low-cost substitute in meat and poultry products. Food service, retail and institutional (primarily school lunch and correctional) facilities regularly use such "extended" products. Extension may result in diminished flavor, but fat and cholesterol are reduced. Vitamin and mineral fortification can be used to make soy products nutritionally equivalent to animal protein; the protein quality is already roughly equivalent. The soy-based meat substitute
textured vegetable protein Textured or texturized vegetable protein (TVP), also known as textured soy protein (TSP), soy meat, or soya chunks is a defatted soy flour product, a by-product of extracting soybean oil. It is often used as a meat analogue or meat extender. ...
has been used for more than 50 years as a way of inexpensively extending
ground beef Ground beef, minced beef or beef mince is beef that has been finely chopped with a knife, meat grinder (American English), mincer or mincing machine (British English). It is used in many recipes including hamburgers, bolognese sauce, meatloaf, m ...
without reducing its nutritional value.


Soy nut butter

The soybean is used to make a product called soy nut butter which is similar in texture to peanut butter.


Sweetened soybean

Sweet boiled beans are popular in Japan and Korea and the sweet boiled soybeans are called as "Daizu no " in Japan and Kongjorim ( ko, 콩조림) in Korea. Sweet boiled beans are even used in sweetened buns, especially in . The boiled and pasted edamame, called , is used as one of the Sweet bean pastes in Japanese confections.


Coffee substitute

Roasted and ground soybeans can be used as a caffeine-free substitute for coffee. After the soybeans are roasted and ground, they look similar to regular coffee beans or can be used as a powder similar to instant coffee, with aroma and flavor of roasted soybeans.


Other products

Soybeans with black hulls are used in Chinese fermented black beans, ''
douchi ''Douchi'' () or ''tochi'' (also known as fermented black soybeans, Chinese fermented black beans (), salted black beans, salty black beans, or just black beans) is a type of fermented and salted black soybean most popular in the cuisine of ...
'', not to be confused with
black turtle bean The black turtle bean is a small, shiny variety of the common bean (''Phaseolus vulgaris'') especially popular in Latin American cuisine, though it can also be found in the Cajun and Creole cuisines of south Louisiana. Like all varieties of the ...
s. Soybeans are also used in industrial products, including oils, soap, cosmetics, resins, plastics, inks, crayons, solvents, and clothing. Soybean oil is the primary source of
biodiesel Biodiesel is a form of diesel fuel derived from plants or animals and consisting of long-chain fatty acid esters. It is typically made by chemically reacting lipids such as animal fat (tallow), soybean oil, or some other vegetable oil wit ...
in the United States, accounting for 80% of domestic biodiesel production. Soybeans have also been used since 2001 as fermenting stock in the manufacture of a brand of
vodka Vodka ( pl, wódka , russian: водка , sv, vodka ) is a clear distilled alcoholic beverage. Different varieties originated in Poland, Russia, and Sweden. Vodka is composed mainly of water and ethanol but sometimes with traces of impuriti ...
. In 1936, Ford Motor Company developed a method where soybeans and fibers were rolled together producing a soup which was then pressed into various parts for their cars, from the distributor cap to knobs on the dash board. Ford also informed in public relation releases that in 1935 over five million acres (20,000 km) was dedicated to growing soybeans in the United States.


Health effects


Reducing risk of cancer

According to the
American Cancer Society The American Cancer Society (ACS) is a nationwide voluntary health organization dedicated to eliminating cancer. Established in 1913, the society is organized into six geographical regions of both medical and lay volunteers operating in more than ...
, "There is growing evidence that eating traditional soy foods such as tofu may lower the risk of cancers of the breast, prostate, or endometrium (lining of the uterus), and there is some evidence it may lower the risk of certain other cancers." There is insufficient research to indicate whether taking soy dietary supplements (e.g., as a pill or capsule) has any effect on health or cancer risk. As of 2018, rigorous dietary
clinical research Clinical research is a branch of healthcare science that determines the safety and effectiveness (efficacy) of medications, devices, diagnostic products and treatment regimens intended for human use. These may be used for prevention, treatmen ...
in people with cancer has proved inconclusive.


Breast cancer

Although considerable research has examined the potential for soy consumption to lower the risk of
breast cancer Breast cancer is cancer that develops from breast tissue. Signs of breast cancer may include a lump in the breast, a change in breast shape, dimpling of the skin, milk rejection, fluid coming from the nipple, a newly inverted nipple, or a r ...
in women, as of 2016 there is insufficient evidence to reach a conclusion about a relationship between soy consumption and any effects on breast cancer. A 2011 meta-analysis stated: "Our study suggests soy isoflavones intake is associated with a significant reduced risk of breast cancer incidence in Asian populations, but not in Western populations."


Gastrointestinal and colorectal cancer

Reviews of preliminary clinical trials on people with
colorectal The large intestine, also known as the large bowel, is the last part of the gastrointestinal tract and of the digestive system in tetrapods. Water is absorbed here and the remaining waste material is stored in the rectum as feces before being rem ...
or
gastrointestinal cancer Gastrointestinal cancer refers to malignant conditions of the gastrointestinal tract (GI tract) and accessory organs of digestion, including the esophagus, stomach, biliary system, pancreas, small intestine, large intestine, rectum and anus. The ...
suggest that soy isoflavones may have a slight protective effect against such cancers.


Prostate cancer

A 2016 review concluded that "current evidence from observational studies and small clinical trials is not robust enough to understand whether soy protein or isoflavone supplements may help prevent or inhibit the progression of prostate cancer." A 2010 review showed that neither soy foods nor isoflavone supplements alter measures of bioavailable
testosterone Testosterone is the primary sex hormone and anabolic steroid in males. In humans, testosterone plays a key role in the development of male reproductive tissues such as testes and prostate, as well as promoting secondary sexual characteristic ...
or estrogen concentrations in men. Soy consumption has been shown to have no effect on the levels and quality of
sperm Sperm is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one). Animals produce motile sperm with a tail known as a flagellum, wh ...
. Meta-analyses on the association between soy consumption and prostate cancer risk in men concluded that dietary soy may lower the risk of prostate cancer.


Cardiovascular health

The Food and Drug Administration (FDA) granted the following health claim for soy: "25 grams of soy protein a day, as part of a diet low in saturated fat and cholesterol, may reduce the risk of
heart disease Cardiovascular disease (CVD) is a class of diseases that involve the heart or blood vessels. CVD includes coronary artery diseases (CAD) such as angina and myocardial infarction (commonly known as a heart attack). Other CVDs include stroke, h ...
." One serving, (1 cup or 240 mL) of soy milk, for instance, contains 6 or 7 grams of soy protein. An American Heart Association (AHA) review of a decade long study of soy protein benefits did not recommend isoflavone supplementation. The review panel also found that soy isoflavones have not been shown to reduce post-menopausal "hot flashes" and the efficacy and safety of isoflavones to help prevent cancers of the breast, uterus or prostate is in question. AHA concluded that "many soy products should be beneficial to cardiovascular and overall health because of their high content of polyunsaturated fats, fiber, vitamins, and minerals and low content of saturated fat". Other studies found that soy protein consumption could lower
LDL Low-density lipoprotein (LDL) is one of the five major groups of lipoprotein that transport all fat molecules around the body in extracellular water. These groups, from least dense to most dense, are chylomicrons (aka ULDL by the overall densi ...
.


Soy allergy

Allergy to soy is common, and the food is listed with other foods that commonly cause allergy, such as milk, eggs, peanuts, tree nuts, shellfish. The problem has been reported among younger children, and the diagnosis of soy allergy is often based on symptoms reported by parents and results of skin tests or blood tests for allergy. Only a few reported studies have attempted to confirm allergy to soy by direct challenge with the food under controlled conditions. It is very difficult to give a reliable estimate of the true prevalence of soy allergy in the general population. To the extent that it does exist, soy allergy may cause cases of
urticaria Hives, also known as urticaria, is a kind of skin rash with red, raised, itchy bumps. Hives may burn or sting. The patches of rash may appear on different body parts, with variable duration from minutes to days, and does not leave any long-lasti ...
and
angioedema Angioedema is an area of swelling (edema) of the lower layer of skin and tissue just under the skin or mucous membranes. The swelling may occur in the face, tongue, larynx, abdomen, or arms and legs. Often it is associated with hives, which are ...
, usually within minutes to hours of ingestion. In rare cases, true
anaphylaxis Anaphylaxis is a serious, potentially fatal allergic reaction and medical emergency that is rapid in onset and requires immediate medical attention regardless of use of emergency medication on site. It typically causes more than one of the follow ...
may also occur. The reason for the discrepancy is likely that soy proteins, the causative factor in
allergy Allergies, also known as allergic diseases, refer a number of conditions caused by the hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermat ...
, are far less potent at triggering allergy symptoms than the proteins of peanut and shellfish. An allergy test that is positive demonstrates that the immune system has formed IgE antibodies to soy proteins. However, this is only a factor when soy proteins reach the blood without being digested, in sufficient quantities to reach a threshold to provoke actual symptoms. Soy can also trigger symptoms via food intolerance, a situation where no allergic mechanism can be proven. One scenario is seen in very young infants who have vomiting and
diarrhoea Diarrhea, also spelled diarrhoea, is the condition of having at least three loose, liquid, or watery bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss. Signs of dehydration often begin w ...
when fed soy-based formula, which resolves when the formula is withdrawn. Older infants can suffer a more severe disorder with vomiting, diarrhoea that may be bloody,
anemia Anemia or anaemia (British English) is a blood disorder in which the blood has a reduced ability to carry oxygen due to a lower than normal number of red blood cells, or a reduction in the amount of hemoglobin. When anemia comes on slowly, t ...
, weight loss and failure to thrive. The most common cause of this unusual disorder is a sensitivity to cow's milk, but soy formulas can also be the trigger. The precise mechanism is unclear and it could be immunologic, although not through the IgE-type antibodies that have the leading role in urticaria and anaphylaxis. However, it is also self-limiting and will often disappear in the toddler years. In the European Union, identifying the presence of soy either as an ingredient or unintended contaminant in packaged food is compulsory. The regulation (EC) 1169/2011 on food-labeling lists 14 allergens, including soy, in packaged food must be clearly indicated on the label as part of the list of ingredients, using a distinctive typography (such as bold type or capital letters).


Thyroid function

One review noted that soy-based foods may inhibit absorption of thyroid hormone medications required for treatment of
hypothyroidism Hypothyroidism (also called ''underactive thyroid'', ''low thyroid'' or ''hypothyreosis'') is a disorder of the endocrine system in which the thyroid gland does not produce enough thyroid hormone. It can cause a number of symptoms, such as po ...
. A 2015 scientific review by the
European Food Safety Authority The European Food Safety Authority (EFSA) is the agency of the European Union (EU) that provides independent scientific advice and communicates on existing and emerging risks associated with the food chain. EFSA was established in February 2002, ...
concluded that intake of isoflavones from supplements did not affect thyroid hormone levels in postmenopausal women.


Research by constituent


Lignans

Plant
lignans The lignans are a large group of low molecular weight polyphenols found in plants, particularly seeds, whole grains, and vegetables. The name derives from the Latin word for "wood". Lignans are precursors to phytoestrogens. They may play a role ...
are associated with high fiber foods such as cereal brans and beans are the principal precursor to mammalian lignans which have an ability to bind to human estrogen sites. Soybeans are a significant source of mammalian lignan precursor
secoisolariciresinol Secoisolariciresinol is an organic compound. It is classified as a lignan, i.e., a type of phenylpropanoid. It is present in some cereals, e.g. rye, and together with matairesinol, has attracted much attention for its beneficial nutritional effect ...
containing 13–273 µg/100 g dry weight.


Phytochemicals

Soybeans and processed soy foods are among the richest foods in total
phytoestrogen A phytoestrogen is a plant-derived xenoestrogen (see estrogen) not generated within the endocrine system, but consumed by eating plants or manufactured foods. Also called a "dietary estrogen", it is a diverse group of naturally occurring nonster ...
s (wet basis per 100 g), which are present primarily in the form of the
isoflavone Isoflavones are substituted derivatives of isoflavone, a type of naturally occurring isoflavonoids, many of which act as phytoestrogens in mammals. Isoflavones are produced almost exclusively by the members of the bean family, Fabaceae (Leguminosae) ...
s,
daidzein Daidzein (7-hydroxy-3-(4-hydroxyphenyl)-4H-chromen-4-one) is a naturally occurring compound found exclusively in soybeans and other legumes and structurally belongs to a class of compounds known as isoflavones. Daidzein and other isoflavones a ...
and
genistein Genistein (C15H10O5) is a naturally occurring compound that structurally belongs to a class of compounds known as isoflavones. It is described as an angiogenesis inhibitor and a phytoestrogen. It was first isolated in 1899 from the dyer's broo ...
. Because most naturally occurring phytoestrogens act as
selective estrogen receptor modulators Selective estrogen receptor modulators (SERMs), also known as estrogen receptor agonist/antagonists (ERAAs), are a class of drugs that act on the estrogen receptor (ER). A characteristic that distinguishes these substances from pure ER agonists a ...
, or SERMs, which do not necessarily act as direct agonists of estrogen receptors, normal consumption of foods that contain these phytoestrogens should not provide sufficient amounts to elicit a physiological response in humans. The major product of daidzein microbial metabolism is
equol Equol (4',7-isoflavandiol) is an isoflavandiolThe structures of 7,4’-dihydroxy-isoflavan and its precursors is shown iStructural Elucidation of Hydroxylated Metabolites of the Isoflavan Equol by GC/MS and HPLC/MSby Corinna E. Rüfer, Hansruedi ...
. Only 33% of Western Europeans have a microbiome that produces equol, compared to 50–55% of Asians. Soy isoflavones— polyphenolic compounds that are also produced by other legumes like peanuts and
chickpea The chickpea or chick pea (''Cicer arietinum'') is an annual legume of the family Fabaceae, subfamily Faboideae. Its different types are variously known as gram" or Bengal gram, garbanzo or garbanzo bean, or Egyptian pea. Chickpea seeds are high ...
s—are under preliminary research. As of 2016, no
cause-and-effect Causality (also referred to as causation, or cause and effect) is influence by which one event, process, state, or object (''a'' ''cause'') contributes to the production of another event, process, state, or object (an ''effect'') where the cau ...
relationship has been shown in
clinical research Clinical research is a branch of healthcare science that determines the safety and effectiveness (efficacy) of medications, devices, diagnostic products and treatment regimens intended for human use. These may be used for prevention, treatmen ...
to indicate that soy isoflavones lower the risk of cardiovascular diseases.


Phytic acid

Soybeans contain
phytic acid Phytic acid is a six-fold dihydrogenphosphate ester of inositol (specifically, of the ''myo'' isomer), also called inositol hexakisphosphate (IP6) or inositol polyphosphate. At physiological pH, the phosphates are partially ionized, resulting in ...
, which may act as a
chelating agent Chelation is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central metal atom. These ligands a ...
and inhibit mineral absorption, especially for diets already low in minerals.


In culture

Although observations of soy consumption having a feminization effect on men are not conclusive, a pejorative term, "
soy boy ''Soy boy'' is a pejorative term sometimes used in online communities to describe men perceived to be lacking masculine characteristics. The term bears many similarities and has been compared to the slang terms '' cuck'' (derived from cuckold), ' ...
", has emerged to describe perceived emasculated young men with feminine traits.


Futures

Soybean
futures Futures may mean: Finance *Futures contract, a tradable financial derivatives contract *Futures exchange, a financial market where futures contracts are traded * ''Futures'' (magazine), an American finance magazine Music * ''Futures'' (album), a ...
are traded on the
Chicago Board of Trade The Chicago Board of Trade (CBOT), established on April 3, 1848, is one of the world's oldest futures and options exchanges. On July 12, 2007, the CBOT merged with the Chicago Mercantile Exchange (CME) to form CME Group. CBOT and three other excha ...
and have delivery dates in January (F), March (H), May (K), July (N), August (Q), September (U), November (X). They are also traded on other commodity futures exchanges under different contract specifications: * SAFEX:
The South African Futures Exchange The South African Futures Exchange (Safex) is the futures exchange subsidiary of JSE Limited, the Johannesburg-based exchange. It consists of two divisions; a financial markets division for trading of equity derivatives and an agricultural marke ...
* DC: Dalian Commodity Exchange * ODE:
Osaka Dojima Commodity Exchange Osaka Dojima Commodity Exchange (ODEX) is a futures exchange based in Osaka, Japan. It started as the Osaka Grain Exchange in 1952. In 1993 it merged with the Osaka Sugar Exchange and the Kobe Grain Exchange, taking the name Kansai Agricultural Co ...
(formerly Kansai Commodities Exchange, KEX) in Japan * NCDEX: National Commodity and Derivatives Exchange, India. * ROFEX: Rosario Grain Exchange in Argentina


See also

* Alternative fodders *
Cash crop A cash crop or profit crop is an agricultural crop which is grown to sell for profit. It is typically purchased by parties separate from a farm. The term is used to differentiate marketed crops from staple crop (or "subsistence crop") in subsisten ...
*
List of soy-based foods This is a list of soy-based foods. The soybean is a species of legume native to East Asia, widely grown for its edible bean which has numerous uses. The plant is classed as an oilseed rather than a pulse by the UN Food and Agriculture Organizatio ...
*
Organic infant formula Organic infant formulas are synthetic substitutes to natural breast milk. United States requirements Organic formulas manufactured in the United States must meet specific conditions regulated by the United States Department of Agriculture, the ...
* Soy molasses * Soybean in Paraguay * Soybean management practices *
Soybean agglutinin Soybean agglutinins (SBA) also known as soy bean lectins (SBL) are lectins found in soybeans. It is a family of similar legume lectins. As a lectin, it is an antinutrient that chelates minerals. In human foodstuffs, less than half of this lecti ...
, a lectin


References

* {{Authority control Chinese cuisine Crops Crops originating from China Edible legumes Energy crops Nitrogen-fixing crops Glycine (plant) Fiber plants Fodder Japanese cuisine Korean cuisine Phaseoleae
Soy products The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean, which has numerous uses. Traditional unfermented food uses of soybeans include soy milk, from which tofu an ...
Taxa named by Elmer Drew Merrill