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30-AUGUST-2008 03:13:07 - Soybean Redirected from Soy Soy redirects here. For other uses, see Soy disambiguation. May 2008 This article or section may be inaccurate or unbalanced in favor of certain viewpoints. Please improve the article by adding information on neglected viewpoints, or discuss the issue on the talk page. This article requires authentication or verification by an expert. Please assist in recruiting an expert or improve this article yourself. This article has been tagged since May 2008. Soybean Scientific classification Kingdom: Plantae Phylum: Magnoliophyta Class: Magnoliopsida Order: Fabales Family: Fabaceae Subfamily: Faboideae Genus: Glycine Species: G. max Binomial name Glycine max L. Merr. The soybean U.S. or soya bean UK Glycine max is a species of legume native to East Asia. It is an annual plant that has been used in China for 5,000 years as a food and a component of drugs. Soy contains significant amounts of all the essential amino acids for humans, and so is a good source of protein. Soybeans are the primary ingredient in many processed foods, including dairy product substitutes. Contents 1 Overview 2 Description and physical characteristics 3 Chemical composition of the seed 4 Cultivation 5 History 6 Soybean diseases 7 Genetic modification 8 Uses 8.1 Oil 8.2 Meal 8.3 Flour 8.4 Infant formula 8.5 Substitute for existing products 8.6 Other products 9 Nutrition 9.1 Protein, vitamins, and minerals 10 Role of soyfoods in disease prevention 10.1 Omega-3 fatty acids 10.2 Isoflavones 10.3 Claims of cholesterol reduction 11 Health risks 11.1 Phytoestrogen 11.1.1 Women 11.1.2 Men 11.2 Infant formula 11.3 Cancer 11.4 Allergy 11.5 Promotion as health food 11.6 Brain 11.7 Carcinogen 11.8 Iron 12 References 13 External links 13.1 Advocacy and nutritional information 13.2 Critical Overview Like some other crops of long domestication, the relationship of the modern soyabean to wild-growing species can no longer be traced with any degree of certainty. It is a cultural variety a cultigen with a very large number of cultivars. The genus Glycine Willd. is divided into two subgenera species, Glycine and Soja. The subgenus SojaMoench includes the cultivated soybean, G. max L. Merrill, and the wild soybean, G. soja Sieb. Zucc. Both species are annual. The soybean grows only under cultivation while G. soja grows wild in China, Japan, Korea, Taiwan and Russia. Glycine soja is the wild ancestor of the soybean: the wild progenitor. At present, the subgenus Glycine consists of at least 16 wild perennial species: for example, Glycine canescens, and G. tomentella Hayata found in Australia, Europe, and Papua New Guinea.1 Beans are classed as pulses whereas soybeans are classed as oilseeds. It is a versatile bean, having a diverse range of uses. The English word soy is derived from the Japanese pronunciation of 醤油 ã?—ょã?†ã‚†, shÅ?yu, the Japanese word for Soya sauce; soya comes from the Dutch adaptation of the same word.23 Description and physical characteristics Soy varies in growth, habit, and height. It may grow prostrate, not higher than 20 cm 7.8 inches, or grow up to 2 meters 6.5 feet high. The pods, stems, and leaves are covered with fine brown or gray hairs. The leaves are trifoliolate, having 3 to 4 leaflets per leaf, and the leaflets are 6-15 cm 2-6 inches long and 2-7 cm 1-3 inches broad. The leaves fall before the seeds are mature. The big, inconspicuous, self-fertile flowers are borne in the axil of the leaf and are white, pink or purple. The fruit is a hairy pod that grows in clusters of 3-5, each pod is 3-8 cm long1-3 inches and usually contains 2-4 rarely more seeds 5-11 mm in diameter. Soybeans occur in various sizes, and in many hull or seed coat colors, including black, brown, blue, yellow, green and mottled. 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 oil. Remarkably, seeds such as soybeans containing very high levels of protein can undergo desiccation yet survive and revive after water absorption. A. Carl Leopold, son of Aldo Leopold, began studying this capability at the Boyce Thompson Institute for Plant Research at Cornell University in the mid 1980s. He found soybeans and corn to have a range of soluble carbohydrates protecting the seed's cell viability.4 Patents were awarded to him in the early 1990s on techniques for protecting biological membranes and proteins in the dry state. Compare to tardigrades. Chemical composition of the seed The oil and protein content together account for about 60% of dry soybeans by weight; protein at 40% and oil at 20%. The remainder consists of 35% carbohydrate and about 5% ash. Soybean cultivars comprise approximately 8% seed coat or hull, 90% cotyledons and 2% hypocotyl axis or germ. The majority of soy protein is a relatively heat-stable storage protein. This heat stability enables Soya food products requiring high temperature cooking, such as tofu, soymilk and textured vegetable protein Soya flour to be made. The principal soluble carbohydrates, saccharides, of mature Soya beans are the disaccharide sucrose range 2.5-8.2%, the trisaccharide raffinose 0.1-1.0% composed of one sucrose molecule connected to one molecule of galactose, and the tetrasaccharide stachyose 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 Soya bean seed from desiccation see above section on physical characteristics they are not digestible sugars and therefore contribute to flatulence and abdominal discomfort in humans and other monogastric animals; compare to the disaccharide trehalose. Undigested oligosaccharides are broken down in the intestine by native microbes producing gases such as carbon dioxide, hydrogen, nitrogen, methane, etc. Since soluble Soy carbohydrates are found mainly in the whey and are broken down during fermentation, Soy concentrate, Soy protein isolates, tofu, Soy sauce, and sprouted Soya beans 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 in the colon against putrefactive bacteria. The insoluble carbohydrates in Soya beans consist of the complex polysaccharides cellulose, hemicellulose, and pectin. The majority of Soya bean carbohydrates can be classed as belonging to dietary fiber. Cultivation Varieties of soybeans are used for many purposes. Varieties of soybeans are used for many purposes. Soybeans are an important global crop, providing oil and protein. The bulk of the crop is solvent-extracted for vegetable oil and then defatted Soymeal is used for animal feed. A small proportion of the crop is consumed directly by humans. Soybean products do appear in a large variety of processed foods. Soybeans were a crucial crop in eastern Asia long before written records, and they remain a major crop in China, Japan, and Korea. Prior to fermented products such as Soy sauce, tempeh, natto, and miso, soy was considered sacred for its use in crop rotation as a method of fixing nitrogen. The plants would be plowed under to clear the field for food crops.citation needed Soya was first introduced to Europe in the early 1700s and what is now the United States in 1765, where it was first grown for hay. Benjamin Franklin wrote a letter in 1770 mentioning sending soybeans home from England. Soybeans did not become an important crop outside of Asia until about 1910. In America, soy was considered an industrial product only and not utilized as a food prior to the 1920s. Soy was introduced in Africa from China in the late 19th Century and is now widespread across the continent. Cultivation is successful in climates with hot summers, with optimum growing conditions in mean temperatures of 20 °C to 30 °C 68°F to 86°F; temperatures of below 20 °C and over 40 °C 68 °F, 104 °F retard growth significantly. They can grow in a wide range of soils, with optimum growth in moist alluvial soils with a good organic content. Soybeans, like most legumes, perform nitrogen fixation by establishing a symbiotic relationship with the bacterium Bradyrhizobium japonicum syn. Rhizobium japonicum; Jordan 1982. However, for best results an inoculum of the correct strain of bacteria should be mixed with the Soya bean or any legume seed before planting. Modern crop cultivars generally reach a height of around 1 m 3 ft, and take 80-120 days from sowing to harvesting. Top Soybean Producers in 2006 million metric tons Flag of the United States United States 87.7 Flag of Brazil Brazil 52.4 Flag of Argentina Argentina 40.4 Flag of the People's Republic of China China 15.5 Flag of India India 8.3 Flag of Paraguay Paraguay 3.8 Flag of Canada Canada 3.5 Flag of Bolivia Bolivia 1.4 World Total 221.5 Source: UN Food Agriculture Organisation FAO1 Soybeans are native to east Asia but only 45 percent of soybean production is located there. The other 55 percent of production is in the Americas. The U.S. produced 75 million tons of soybeans in 2000, of which more than one-third was exported. Other leading producers are Brazil, Argentina, China, and India. Environmental groups, such as Greenpeace and the WWF, have reported that both soybean cultivation and the probability of increased soybean cultivation in Brazil, has destroyed huge areas of Amazon rainforest and is encouraging further deforestation.5 American soil scientist Dr. Andrew McClung, who first showed that the ecologically biodiverse savannah of the Cerrado region of Brazil could grow profitable soybeans, was awarded the 2006 World Food Prize on October 19, 2006.6 The first research on soybeans in the United States was conducted by George Washington Carver at Tuskegee, Alabama, but he decided it was too exotic a crop for the poor black farmers of the South so he turned his attention to peanuts. History Soybean output in 2005 Soybean output in 2005 The origins of the soybean plant are obscure, but many botanists believe it to have derived from Glycine ussuriensis, a legume native to central China.7 The soybean has been used in China for 5,000 years as a food and a component of drugs. According to the ancient Chinese, in 2853 BC the legendary Emperor Shennong of China named five sacred plants - soybeans, rice, wheat, barley, and millet.8 Cultivation of soybeans, long confined chiefly to China, gradually spread to other countries.9 According to other sources, the earliest preserved soybeans were unearthed from archaeological sites in Korea.1011 Radiocarbon dating of soybean recovered through flotation during excavations at the Early Mumun Period Okbang site in Korea indicates that soybean was cultivated as a food crop in ca. 1000-900 BC.12 The best current evidence on the Japanese Archipelago suggests that soybean cultivation occurred in the early Yayoi period. From about the first century AD to the Age of Discovery 15-16th century, soybeans were introduced into several countries such as Japan, Indonesia, the Philippines, Vietnam, Thailand, Malaysia, Burma, Taiwan, Nepal and India. 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 712 AD. 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. In the United States they are now a leading crop, and Brazil, Argentina, and Paraguay also are significant soybean-exporting nations. Many people have claimed that soybeans in Asia, prior to modern times, were only used after a fermentation process, which alters the high increase in phytoestrogens found in the raw plant. However, this appears to be incorrect: Terms similar to soy milk have been in use since 82 AD 2, and there is evidence of tofu consumption that dates to 220.3 The genus name Glycine was originally introduced by Linnaeus 1737 in his first ion of Genera Plantarum. The word glycine is derived from the Greek-glykys sweet and very likely refers to the sweetness of the pear-shaped apios in Greek edible tubers produced by the native North American twining or climbing herbaceous legume, Glycine apios, now known as Apios americana. Alternative names include: ground nut, American potato bean, wild bean, Indian potato, ground bean, hopniss, and sea vines. The seeds are also edible. Soy saved the Massachusetts Bay Pilgrims from starvation.13 The cultivated soybean first appeared in the Species Plantarum, Linnaeus, under the name Phaseolus max L. The combination, Glycine maxL. Merr., as proposed by Merrill in 1917, has become the valid name for this useful plant. Soybean diseases Main article: List of soybean diseases Genetic modification Soybeans are one of the biotech food crops that have been genetically modified, and GM soybeans are being used in an increasing number of products. In 1995 Monsanto introduced Roundup Ready RR soybeans that have had a copy of a gene from the bacterium, Agrobacterium sp. strain CP4, inserted into its genome by means of a gene gun, that allows the transgenic plant to survive being sprayed by the non-selective herbicide, Roundup. Glyphosate, the active ingredient in Roundup, kills conventional soybeans. The bacterial gene is EPSP 5-enolpyruvyl shikimic acid-3-phosphate synthase. Soybeans also have a version of this gene, but the soybean version is sensitive to glyphosate, while the CP4 version is not.14 RR soybeans allow a farmer to spray widely the herbicide Roundup and so to reduce tillage or even to sow the seed directly into an unplowed field, known as no-till farming or conservation tillage. No-till agriculture has many advantages, greatly reducing soil erosion and creating better wildlife habitat;15 it also saves fossil fuels and sequesters CO2, a greenhouse effect gas.16 It should be noted that RR soybeans simplify the process, but are not a requirement for no-till agriculture. Roundup may be sprayed on the field and weeds before the non-RR soybeans have emerged from the soil. The wildlife advantage doesn't matter much, however: most of the time, no animals, except for moths, can be spotted anywhere near soybeans.citation needed The crops' nutritional needs assure that no other plants grow amidst them; and the humongous size of most fields ensures that animals won't venture there, for none eat soybeans and would starve.citation needed In 1997, about 8% of all soybeans cultivated for the commercial market in the United States were genetically modified. In 2006, the figure was 89%. As with other Roundup Ready crops, concern is expressed over damage to biodiversity.17 However, the RR gene has been bred into so many different soybean cultivars that the genetic modification itself has not resulted in any decline of genetic diversity, as demonstrated by a study on genetic diversity.18 The ubiquitous 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 extensive 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.19 Uses 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 and soymilk 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 they have a tendency for the pods to shatter on reaching maturity. Among the legumes, the soybean, also classed as an oilseed, is pre-eminent for its high 38-45% protein content as well as its high 20% oil content. Soybeans are the leading agricultural export in the United States. The bulk of the soybean crop is grown for oil production, with the high-protein defatted and toasted soy meal used as livestock feed. A smaller percentage of soybeans are used directly for human consumption. Immature soybeans may be boiled whole in their green pod and served with salt, under the Japanese name edamame æž?豆, edamame?. Soybeans prepared this way are a popular local snack in Hawaii, and are becoming increasingly popular in the continental United States. Because of the proclaimed health benefits of soy, edamame has been featured as an ideal snack alternative in fitness and healthy living magazines such as Real Simple. Edamame is sold in the frozen vegetable section at some larger grocery stores, and as ready-to-eat snackfood in many Asian delis. In China, Japan, and Korea the bean and products made from the bean are a popular part of the diet. The Chinese invented tofu 豆è…?, and also made use of several varieties of soybean paste as seasonings. Japanese foods made from soya include: miso 味噌, natto ç´?豆, and edamame æž?豆. In Korean cuisine, soybean sprouts, called kongnamul 콩나물 are also used in a variety of dishes such as doenjang, cheonggukjang and ganjang. The beans can be processed in a variety of ways. Common forms of soy or soya include soy meal, soy flour, soy milk, tofu, textured vegetable protein TVP, which is made into a wide variety of vegetarian foods, some of them intended to imitate meat, tempeh, soy lecithin and soybean oil. Soybeans are also the primary ingredient involved in the production of soy sauce or shoyu. Soybeans grow throughout Asia and North and South America. Soybeans grow throughout Asia and North and South America. Soybean fields in the United States Soybean fields in the United States Archer Daniels Midland ADM is among the largest processors of soybeans and soy products. ADM along with Dow Chemical Company, DuPont and Monsanto support the industry trade associations United Soybean Board USB and Soyfoods Association of North America SANA. These trade associations have increased the consumption of soy products dramatically in recent years. Oil In processing soybeans for oil extraction and subsequent soy flour production, selection of high quality, sound, clean, dehulled yellow soybeans are very important. Soybeans having a dark colored seed coat, or even beans with a dark hilum will inadvertently leave dark specks in the flour, and are undesirable for use in commercial food products. All commercial soybeans in the United States are yellow or yellow brown. To produce soybean oil, 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. The remaining soybean husks are used mainly as animal feed. The major unsaturated fatty acids in soybean oil triglycerides are 7% linolenic acid C18:3; 51% linoleic acid C-18:2; and 23% oleic acidC-18:1. It also contains the saturated fatty acids 4% stearic acid and 10% palmitic acid. Soybean oil has a relatively high proportion, 7-10%, of oxidation prone linolenic acid, which is an undesirable property for continuous service, such as in a restaurant. In the early nineties, Iowa State University developed soybean oil with 1% linolenic acid in the oil. Three companies, Monsanto, DuPont/Bunge, and Asoyia in 2004 introduced low linolenic, C18:3; cis-9, cis-12, cis-15 octadecatrienoic acid Roundup Ready soybeans. In the past, hydrogenation was used to reduce the unsaturation in linolenic acid, but this produced the unnatural trans-fatty acid configuration, whereas in nature the configuration is cis see trans fat. This external picture from North Dakota State University compares soybean oil fatty acid content with other oils. In the 2002-2003 growing season, 30.6 million tons of soybean oil were produced worldwide, constituting about half of worldwide edible vegetable oil production, and thirty percent of all fats and oils produced, including animal fats and oils derived from tropical plants.20 While soybean oil has no direct insect repellent activity, it is used as a fixative to extend the short duration of action of essential oils such as geranium oil in several commercial products.2122 Meal It has been suggested that Soybean meal be merged into this article or section. Discuss Main article: Soybean meal Soybean meal, the material remaining after solvent extraction of soybean flakes, with a 50% soy protein content, toasted a misnomer because the heat treatment is with moist steam and ground in a hammer mill, provided the energy for the American production method, beginning in the 1930s, of growing farm animals such as poultry and swine on an industrial scale; and more recently the aquaculture of catfish. Flour Soy flour refers to defatted soybeans where special care was taken during desolventizing not toasted in order to minimize denaturation of the protein to retain a high Nitrogen Solubility Index NSI, for uses such as extruder texturizing TVP. It is the starting material for production of soy concentrate and soy protein isolate. Defatted soy flour is obtained from solvent extracted flakes, and contains less than 1% oil. Full-fat soy flour is made from unextracted, dehulled beans, and contains about 18% to 20% oil. Due to its high oil content a specialized Alpine Fine Impact Mill must be used for grinding rather than the more common hammer mill. Low-fat soy flour is made by adding back some oil to defatted soy flour. The lipid content varies according to specifications, usually between 4.5% and 9%. High-fat soy flour can also be produced by adding back soybean oil to defatted flour at the level of 15%. Lecithinated soy flour is made by adding soybean lecithin to defatted, low-fat or high-fat soy flours to increase their dispersibility and impart emulsifying properties. The lecithin content varies up to 15%. Infant formula Infant formulas based on soy SBIF are used by lactose-intolerant babies and for babies that are allergic to cow milk proteins. The formulas are sold in powdered, ready-to-feed, or concentrated liquid forms. Some reviews express the opinion that more research is needed to answer the question of what effect the phytoestrogens contained in soy formula may have on infants,2324 but did not find any adverse effects. Diverse studies conclude there are no adverse effects in human growth, development, or reproduction as a result of the consumption of soy-based infant formula.252627 One of these studies, published at the Journal of Nutrition,27 concludes that: ...there is 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. Substitute for existing products Open package of a soy-based cream cheese alternative with chives Open package of a soy-based cream cheese alternative with chives Soybeans are the primary ingredient in many processed foods, including dairy product substitutes e.g., margarine, soy ice cream, soy milk, soy yogurt, soy cheese and soy cream cheese, as well as Crisco, soybean oil, tofu, veggie burgers, soynut butter, soy crisps, among others. Soybeans are processed to produce a texture and appearance similar to other foods e.g., butter, ice cream, milk, yogurt, cheese, lard, olive oil, ground beef, peanut butter, potato chips, etc. and are readily available in most supermarkets. Soy milk does not contain significant amounts of calcium, since the high calcium content of soybeans is bound to the insoluble constituents and remains in the pulp. Many manufacturers of soy milk now sell calcium-enriched products as well. Other products Soybeans are the bean used in Chinese fermented black beans, douchi, not the sometimes confused black turtle beans. 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 in the United States, accounting for 80% of domestic biodiesel production 28. Soybeans are also used as fermenting stock to make a brand of vodka.citation needed Henry Ford promoted the soybean, helping to develop uses for it both in food and in industrial products, even demonstrating auto body panels made of soy-based plastics. Ford's interest led to two bushels of soybeans being used in each Ford car as well as products like the first commercial soy milk, ice cream and all-vegetable non-dairy whipped topping. The Ford development of so-called soy-based plastics was based on the addition of soybean flour and wood flour to phenolformaldehyde plastics. In 1931, Ford hired chemists Robert Boyer and Frank Calvert to produce artificial silk. 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 by the Federal Trade Commission. Pilot production of Azlon reached 5000 pounds per day in 1940, but never reached the commercial market. Today, very high quality textile fibers are made commercially from okara soy pulp, a by-product of tofu production. Nutrition Soybean, green raw Nutritional value per 100 g 3.5 oz Energy 30 kcal 130 kJ Carbohydrates 5.94 g - Sugars 4.13 g - Dietary fiber 1.8 g Fat 0.18 g - saturated 0.046 g - monounsaturated 0.022 g - polyunsaturated 0.058 g Protein 3.04 g Water 90.4 g Vitamin A equiv. 1 μg 0% Vitamin B6 0.088 mg 7% Vitamin B12 0 μg 0% Vitamin C 13.2 mg 22% Vitamin K 33 μg 31% Calcium 13 mg 1% Iron 0.91 mg 7% Magnesium 21 mg 6% Phosphorus 54 mg 8% Potassium 149 mg 3% Sodium 6 mg 0% Zinc 0.41 mg 4% Percentages are relative to US recommendations for adults. Source: USDA Nutrient database Protein, vitamins, and minerals Main article: soy protein Soybeans are considered by some to be a source of complete protein, thus having no need for protein combining,29 although this is contested by other sources.303132 A complete protein is one that contains significant amounts of all the essential amino acids that must be provided to the human body because of the body's inability to synthesize them. For this reason, soy is a good source of protein, amongst many others, for many vegetarians and vegans or for people who cannot afford meat. The gold standard for measuring protein quality, since 1990, is the Protein Digestibility Corrected Amino Acid Score PDCAAS and by this criterion soy protein is near to being the nutritional equivalent of meat and eggs for human growth and health. Soybean protein isolate has a Biological Value of 74, whole soybeans 96, soybean milk 91, and eggs 97.33 Soy protein is similar to that of other legume seeds, but has the highest yield per square meter of growing area, and is the least expensive source of dietary protein. Consumption of soy may also reduce the risk of colon cancer, possibly due to the presence of sphingolipids.34 Role of soyfoods in disease prevention Omega-3 fatty acids Roasted soybeans Roasted soybeans Omega-3 fatty acids, for example, alpha-linolenic acid C18-3, all cis, 9,12,15 octadecatrienoic acid where the omega-3 refers to carbon number 3 counting from the hydrocarbon tail whereas C-15 refers to carbon number 15 counting from the carboxyl acid head are special fat components that benefit many body functions. However, the effects which are beneficial to health are associated mainly with the longer-chain, more unsaturated fatty acids eicosapentaenoic 20:5n-3, EPA and docosahexaenoic acid 22:6n-3, DHA found in fish oil and oily fish. For instance, EPA and DHA, inhibit blood clotting, while there is no evidence that alpha-linolenic acid aLNA can do this. Soybean oil is one of the few common vegetable oils that contains a significant amount of aLNA; others include canola, walnut, and flax. However, soybean oil does not contain EPA or DHA. Soybean oil does contain significantly greater amount of omega-6 fatty acids in the oil: 100g of soybean oil contains 7g of omega-3 fatty acids to 51g of omega-6: a ratio of 1:7. Flaxseed, in comparison, has an omega-3:omega-6 ratio of 3:1. Isoflavones Main article: Isoflavone Soybeans also contain the isoflavones genistein and daidzein, types of phytoestrogen, that are considered by some nutritionists and physicians to be useful in the prevention of cancer and by others to be carcinogeniccitation needed and endocrine disruptivecitation needed. Soy's content of isoflavones are as much as 3 mg/g dry weight.citation needed Isoflavones are polyphenol compounds, produced primarily by beans and other legumes, including peanuts and chickpeas. Isoflavones are closely related to the antioxidant flavonoids found in other plants, vegetables and flowers. Isoflavones such as genistein and daidzein are found in only some plant families, because most plants do not have an enzyme, chalcone isomerase which converts a flavone precursor into an isoflavone. In contradiction to well known benefits of isoflavones, Genistein acts as an oxidant stimulating nitrate synthesis,35 as well as it blocks formation of new blood vessels antiangiogenic effects.36 Some studies show Genistein to act as inhibitor of the activity of substances in the body that regulate cell division and cell survival growth factors. Claims of cholesterol reduction The dramatic increase in soyfood sales is largely cred to the Food and Drug Administration's FDA approval of health claims for soy in which studies are conflicting as to their cholesterol lowering ability.37 From 1992 to 2003, sales have experienced a 15% compound annual growth rate, increasing from $300 million to $3.9 billion over 11 years, as new soyfood categories have been introduced, soyfoods have been repositioned in the market place, thanks to a better emphasis on marketing nutrition. In 1995, the New England Journal of Medicine Vol. 333, No. 5 published a report from the University of Kentucky entitled, Meta-Analysis of the Effects of Soy Protein Intake on Serum Lipids. It was financed by the PTI division of DuPont,The Solae Co.38 St. Louis, Missouri, a soy producer and marketer. This meta-analysis concluded that soy protein is correlated with significant decreases in serum cholesterol, Low Density Lipoprotein LDL bad cholesterol and triglyceride concentrations. However, High Density Lipoprotein HDLgood cholesterol did not increase by a significant amount. Soy phytoestrogens isoflavones: genistein and daidzein adsorbed onto the soy protein were suggested as the agent reducing serum cholesterol levels. On the basis of this research PTI, in 1998, filed a petition with FDA for a health claim that soy protein may reduce cholesterol and the risk of heart disease. It should be noted that only subjects with serum cholesterol of 250 mg/dl and higher showed any improvement in the study. The FDA granted this 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.39 One serving, 1 cup or 240 mL of soy milk, for instance, contains 6 or 7 grams of soy protein. Solae resubmitted their original petition, asking for a more vague health claim, after their original was challenged and highly criticized. Solae also submitted a petition for a health claim that soy can help prevent cancer. They quickly withdrew the petition for lack of evidence and after more than 1,000 letters of protest were received. In February 18, 2008 Weston A. Price Foundation submitted a petition for removal of this health claim.40 In January, 2006 an American Heart Association review in the journal Circulation of a decade long study of soy protein benefits casts doubt on the FDA allowed Heart Healthy claim for soy protein. This review of the literature compared soy protein and its component isoflavones with casein isolated milk protein, wheat protein, and mixed animal proteins.41 The review panel also found that soy isoflavones have not been shown to reduce post menopause hot flashes in women and the efficacy and safety of isoflavones to help prevent cancers of the breast, uterus or prostate is in question. Thus, soy isoflavone supplements in food or pills is not recommended. Among the conclusions the authors state, In contrast, soy products such as tofu, soy butter, soy nuts, or some soy burgers 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. Using these and other soy foods to replace foods high in animal protein that contain saturated fat and cholesterol may confer benefits to cardiovascular health.42 The original paper is in the journal Circulation: January 17, 2006.43 Health risks Phytoestrogen Main article: Phytoestrogens Soybeans contain isoflavones called genistein and daidzein, which are one source of phytoestrogens in the human diet. Because most naturally occurring estrogenic substances show weak activity, normal consumption of foods that contain these phytoestrogens should not provide sufficient amounts to elicit a physiological response in humans.citation needed Plant lignans 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 containing 13-273 µg/100 g dry weight.44 Another phytoestrogen in the human diet with estrogen activity is coumestans, which are found in beans, split-peas, with the best sources being alfalfa, clover, and soybean sprouts. Coumestrol, an isoflavone coumarin derivative is the only coumestan in foods.4546 Soybeans and processed soy foods do not contain the highest total phytoestrogen content of foods. A study in which data were presented on an as-is wet basis per 100 g and per serving found that food groups from highest to lowest levels of total phytoestrogens per 100 g are nuts and oilseeds, soy products, cereals and breads, legumes, meat products, various processed foods that may contain soy, vegetables, and fruits.47 Women A 2001 literature review suggested that women with current or past breast cancer should be aware of the risks of potential tumor growth when taking soy products, based on the effect of phytoestrogens to promote breast cancer cell growth in animals.48 A 2006 commentary reviewed the relationship with soy and breast cancer. They stated that soy may prevent breast cancer, but cautioned that the impact of isoflavones on breast tissue needs to be evaluated at the cellular level in women at high risk for breast cancer.49 Men Because of the phytoestrogen content, some studies, but not all, have suggested that there is an inverse correlation between soybean ingestion and testosterone in men.50 For this reason, they may protect against the development of prostate cancer.51 A theoretical decrease in the risk of prostate cancer should, however, be weighed against the possible side-effects of decreased testosterone, which are still unclear. The popular fear that soybeans might cause reduced libido and even feminine characteristics in men has not been indicated by any study; the popularity of the notion seems to be based on the simplistic misapprehension that estrogen and testosterone have a simple, inverse relationship in sexual hormone systems and sex-related behaviour. Their interplay is very complicated and largely still unknown.52 Studies published in July 2008 show that Soy products and, more specifically, the phytoestrogen they contain might lower a man's sperm count.53 Infant formula There are some studies that state that phytoestrogen in soy can lead to alterations in the proliferation and migration of intestinal cells. The effects of these alterations are unknown.54 However, some studies conclude there are no adverse effects in human growth, development, or reproduction as a result of the consumption of soy-based infant formula.55 Other reviews agree, but state that more research is needed to answer the question of what effect phytoestrogens have on infants.5657 Soy formula has also been linked to autoimmune disorders of the thyroid gland.58 Cancer The soy industry companies claim soy to have anticancer benefits. The statement is mainly based on statistics which shows that Japanese, who have soy based products as a part of a daily nutrient, suffer less from breast cancer, uterus and prostate. The fact that Asian population, with the Japanese among them, have much higher rates of cancer related to dejection system and thyroid are less popularized.citation needed Allergy Main article: Soy allergy Allergy to soy is often said to be rather common, and the food is listed with other foods that commonly cause allergy, such as milk, eggs, peanuts, tree nuts, shellfish. However, a critical review of medical literature reveals surprisingly little solid information on the topic. The problem has been reported amongst younger children and the diagnosis of soy allergy is often based on symptoms reported by parents and/or 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. In these circumstances it is clear that skin/blood tests considerably overestimate the problem, as do parental reports. 59. 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 and angioedema swelling, usually within minutes to two hours of ingestion of the food. In rare, severe cases true anaphylaxis may occur, a condition that is much more common with allergy to foods such as peanut and shellfish. The reason for the discrepancy is likely that soy proteins, the causative factor in allergy, are far less potent at triggering allergy symptoms than the proteins of peanut and shellfish. 60. An allergy test that is positive demonstrates that the immune system has formed IgE antibodies to soy proteins. However, when soy is ingested proteins must evade digestion and be absorbed in a form capable of triggering allergy and also in sufficient quantities to reach a threshold to provoke actual symptoms. The low potency of soy proteins as allergens may help explain why allergy skin/blood tests suggest that soy allergy is common, yet few cases are confirmed when the food is eaten under observation.and also soybean gives you acne. Soy can also trigger symptoms via food intolerance, a situation where no immunologic allergic mechanism can be proven. One scenario is seen in very young infants who have vomiting and diarrhoea when fed soy-based formula. The symptoms resolve when the formula is withdrawn and recur when it is re-administered. That said, the intolerance resolves in most cases in a matter of months. Older infants can suffer a more severe disorder with vomiting, diarrhoea that may be bloody, anemia, weight loss and failure to thrive. The commonest cause of this unusual disorder is a sensitivity to cow's milk, but there is no doubt that 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. Fortunately it is also self-limiting and will often disappear in the toddler years.61 Promotion as health food Soy consumption has been promoted by natural food companies and the soy industry's aggressive marketing campaign in various magazines, television ads and in health food markets. Research has been conducted examining the validity of the beneficial health claims with regard to the increase in consumption of soybeans which mimic hormonal activity. A practice guideline published in the journal Circulation questions the efficacy and safety of soy isoflavones for preventing or treating cancer of the breast, endometrium, and prostate although the same study also concludes that soy in some foods should be beneficial to cardiovascular and overall health and does not recommend usage of isoflavone supplements in food or pills.62 A review of the available studies by the United States' Health and Human Services' Agency for Healthcare Research and Quality AHRQ found little evidence of substantial health improvements and no adverse effects, but also noted that there was no long-term safety data on estrogenic effects from soy consumption.63 Brain Estrogen helps protect and repair the brain during and after injury.64 The mimicry of estrogen by the phytoestrogens in soy has introduced a controversy over whether such a replacement is harmful or helpful to the brain. Several studies have found soy to be harmful for rats.65 Nevertheless the cited study was based on rats fed with concentrated phytoestrogens and not common soybeans and it is already well known that concentrated estrogens cause negative effects in males. The common amounts of phytoestrogens in soy beans are not to be compared to concentrated estrogen. One study followed over 3000 Japanese men between 1965 and 1999, and that showed a positive correlation between brain atrophy and consumption of tofu.66 Carcinogen Raw soy flour is known to cause pancreatic cancer in rats.67 Whether this is also true in humans is unknown because no studies comparing cases of pancreatic cancer and soy intake in humans have yet been conducted, and the doses used to induce pancreatic cancer in rats are said to be larger than humans would normally consume. Heated soy flour may not be carcinogenic in rats.6869 Existing cancer patients are being warned to avoid foods rich in soy because they can accelerate the growth of tumours.70 Iron A study conducted in Taiwan found that a vegetarian diet that is rich in soybean products and restricted in animal foods is limited in bioavailable iron and is not adequate for maintaining iron balance in men and women71. References ^ http://www.nsrl.uiuc.edu/news/nsrl_pubs/sbr1995/ArticleID.pdf ^ soy, n.¹ The Oxford English Dictionary: Second ion. 1989. Accessed December 14, 2007. ^ soya, n. The Oxford English Dictionary: Second ion. 1989. Accessed December 14, 2007. ^ Blackman first = SA; Obendorf RL, Leopold AC Sept 1992. Maturation Proteins and Sugars in Desiccation Tolerance of Developing Soya bean Seeds 1.2M PDF, or scanned pages. Plant Physiol. 100 1: 225-30. PMID 16652951. Full text at PMC: 1075542. Retrieved on 2006-10-21. ^ Land Clearing and the Biofuel Carbon Debt. Joseph Fargione, Jason Hill, David Tilman, Stephen Polasky, and Peter Hawthorne. Published online 7 February 2008 DOI: 10.1126/science.1152747 in Science Express Reports Environment, the National Science Foundation DEB0620652, Princeton Environmental Institute, and the Bush Foundation. We thank T. Searchinger for valuable comments and insights, and J. Herkert for providing references. Supporting Online Material www.sciencemag.org.Abstract Supporting Online Material. ^ Lang, Susan 2006-06-21. Cornell alumnus Andrew Colin McClung reaps 2006 World Food Prize, Cornell University. Retrieved on 2006-10-21. ^ Soybean. Encyclopædia Britannica Online. Accessed January 15, 2008 ^ History of Soybeans. Soya - Information about Soy and Soya Products. Accessed January 15, 2008 ^ Soybean. Columbia Encyclopedia, Sixth ion. 2001-07. Accessed January 15, 2008 ^ Crawford, Gary W. 2006. East Asian Plant Domestication. In Archaeology of East Asia, ed by Miriam Stark. Blackwell, Oxford, pp. 81. ^ Crawford and Lee 2003 ^ Crawford and Lee 2003:90 ^ Groundnut ^ Padgette SR, Kolacz KH, Delannay X, Re DB, LaVallee BJ, Tinius CN, Rhodes WK, Otero YI, Barry GF, Eichholz DA, Peschke VM, Nida DL, Taylor NB, Kishore GM 1995 Development, identification, and characterization of a glyphosate-tolerant soybean line. Crop Sci 35:1451-1461 ^ Conservation Technology Information Center, http://www.conservationinformation.org/ ^ Brookes G and Barfoot P 2005 GM crops: The global economic and environmental impact-the first nine years 1996-2004. AgBioForum 8:187-195 ^ Liu, KeShun 1997-05-01. Soybeans: Chemistry, Technology, and Utilization Hardcover, Springer, 532. ISBN 0-8342-1299-4. ^ Sneller CH 2003 Impact of transgenic genotypes and subdivision on diversity within elite North American soybean germplasm. Crop Sci 43:409-414. ^ EU caught in quandary over GMO animal feed imports The Guardian, 7 December 2007 ^ United States Department of Agriculture, Agricultural Statistics 2004. Table 3-51. ^ Barnard, D.R. and R. Xue. 2004. Laboratory evaluation of mosquito repellents against Aedes albopictus, Culex nigripalpus, and Ochlerotatus triseriatus Diptera: Culicidae. J. Med. Entomol. 414:726-730. ^ Fradin, M.S. and J.F. Day. 2002. Comparative efficacy of insect repellents against mosquito bites. N. Engl. J. Med. 347:13-18. ^ Soy-based formulas and phytoestrogens: a safety profile review article PMID 14599051 ^ Isoflavones in soy infant formula: a review of evidence for endocrine and other activity in infants PMID 15189112 ^ Soy protein formulas in children: no hormonal effects from long-term feeding PMID 15055353 ^ Exposure to soy-based formula in infancy and endocrinological and reproductive outcomes in young adulthood. PMID 11497534 ^ a b Safety of Soy-Based Infant Formulas Containing Isoflavones: The Clinical Evidence PMID 15113975 ^ Sustainability Fact Sheet National Biodiesel Board, April 2008. http://biodiesel.org/resources/sustainability/pdfs/SustainabilityFactSheet.pdf ^ http://www.truestarhealth.com/members/cm_archives12ML3P1A8.html The Scoop on Protein Powders By Sofia Segounis, Nutritionist ^ THE DOWNSIDE OF SOYBEAN CONSUMPTION ^ Protein Means Power and a Whole Lot More ^ http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940015664_1994015664.pdf ^ Protein Quality-Report of Joint FAO'/WHO Expert Consultation, Food and Agriculture Organisation, Rome, FAO Food and Nutrition Paper 51, 1991. ^ Symolon H, Schmelz E, Dillehay D, Merrill A 2004. Dietary soy sphingolipids suppress tumorigenesis and gene expression in 1,2-dimethylhydrazine-treated CF1 mice and ApcMin/+ mice.. J Nutr 134 5: 1157-61. PMID 15113963. ^ British Journal of Nutrition. 895:607-616, May 2003. ^ UROLOGY official journal of the Société Internationale d'UrologieVolume 64, Issue 2, Pages 389-393 August 2004 ^ Cornell University Food and Brand Lab Article ^ The Solae Company ^ Henkel, John. Soy:Health Claims for Soy Protein, Question About Other Components. Food and Drug Administration. Retrieved on February 16, 2008. ^ Docket No. 2007N0-464. Retrieved on 2008-03-08. ^ Protein, Isoflavones, and Cardiovascular Health: An American Heart Association Science Advisory for Professionals From the Nutrition Committee -- Sacks et al. 113 7: 1034 -- Circulation ^ Soy Protein, Isoflavones, and Cardiovascular Health: An American Heart Association Science Advisory for Professionals From the Nutrition Committee -- Sacks et al. 113 7: 1034 -- Circulation ^ Soy Protein, Isoflavones, and Cardiovascular Health. An American Heart Association Science Advisory for Professionals From the Nutrition Committee -- Sacks et al., 10.1161/CIRCULATIONAHA.106.171052 -- Circulation ^ Adlercreutz H, Mazur W, Bartels P, et al 2000. Phytoestrogens and prostate disease. J. Nutr. 130 3: 658S-9S. PMID 10702603. ^ de Kleijn MJ, van der Schouw YT, Wilson PW, Grobbee DE, Jacques PF 2002. Dietary intake of phytoestrogens is associated with a favorable metabolic cardiovascular risk profile in postmenopausal U.S.women: the Framingham study. J. Nutr. 132 2: 276-82. PMID 11823590. ^ Valsta LM, Kilkkinen A, Mazur W, et al 2003. Phyto-oestrogen database of foods and average intake in Finland. Br. J. Nutr. 89 Suppl 1: S31-8. doi:10.1079/BJN2002794. PMID 12725654. ^ Lawrence Erlbaum Associates, Inc. - Nutrition and Cancer - 542:184 - Abstract ^ de Lemos ML 2001. Effects of soy phytoestrogens genistein and daidzein on breast cancer growth. Ann Pharmacother 35 9: 1118-21. PMID 11573864. ^ Messina M, McCaskill-Stevens W, Lampe JW 2006. Addressing the soy and breast cancer relationship: review, commentary, and workshop proceedings. J. Natl. Cancer Inst. 98 18: 1275-84. doi:10.1093/jnci/djj356. PMID 16985246. ^ Dillingham BL, McVeigh BL, Lampe JW, Duncan AM 2005. Soy protein isolates of varying isoflavone content exert minor effects on serum reproductive hormones in healthy young men. J. Nutr. 135 3: 584-91. PMID 15735098. ^ Heald CL, Ritchie MR, Bolton-Smith C, Morton MS, Alexander FE 2007. Phyto-oestrogens and risk of prostate cancer in Scottish men. Br. J. Nutr. 98 2: 388-96. doi:10.1017/S0007114507700703. PMID 17403269. ^ Serum prostate-specific antigen but not testostero...Eur J Clin Nutr. 2006 - PubMed Result ^ AOL News - Soy Linked to Lower Sperm Count ^ Chen AC, Donovan SM 2004. Genistein at a concentration present in soy infant formula inhibits Caco-2BBe cell proliferation by causing G2/M cell cycle arrest. J. Nutr. 134 6: 1303-8. PMID 15173388. ^ Merritt RJ, Jenks BH 2004. Safety of soy-based infant formulas containing isoflavones: the clinical evidence. J. Nutr. 134 5: 1220S-1224S. PMID 15113975. ^ Miniello VL, Moro GE, Tarantino M, Natile M, Granieri L, Armenio L 2003. Soy-based formulas and phyto-oestrogens: a safety profile. Acta Paediatr Suppl 91 441: 93-100. PMID 14599051. ^ Chen A, Rogan WJ 2004. Isoflavones in soy infant formula: a review of evidence for endocrine and other activity in infants. Annu. Rev. Nutr. 24: 33-54. doi:10.1146/annurev.nutr.24.101603.064950. PMID 15189112. ^ Fort P, Moses N, Fasano M, Goldberg T, Lifshitz F 1990. Breast and soy-formula feedings in early infancy and the prevalence of autoimmune thyroid disease in children. J Am Coll Nutr 9 2: 164-7. PMID 2338464. ^ Cantani, A Aug 1997. Natural history of soy allergy and/or intolerance in children, and clinical use of soy-protein formulas. Pediatr Allergy Immunol 8 2: 59-74. ^ Cordle, C T May 2004. Soy protein allergy: incidence and relative severity.. Journal of Nutrition 134 5: 1213S-1219S. ^ Sampson, H A May 1999. Food allergy. Part 1: Immunopathogenesis and clinical disorders. Journal of Allergy and Clinical Immunology 103 5: 717-728. ^ Sacks, FM; Lichtenstein A, Van Horn L, et. al Feb 2006. Soy protein, isoflavones, and cardiovascular health: an American Heart Association Science Advisory for professionals from the Nutrition Committee.. Circulation 113 7: 1034-44. doi:10.1161/CIRCULATIONAHA.106.171052. PMID 16418439. Retrieved on 2006-10-21. ^ Study Casts Doubt On Soy's Health Benefits. Consumer Affairs 2005-08-03. ^ Eberling JL, Wu C, Haan MN, Mungas D, Buonocore M, Jagust WJ 2003. Preliminary evidence that estrogen protects against age-related hippocampal atrophy. Neurobiol. Aging 24 5: 725-32. doi:10.1016/S0197-45800200056-8. PMID 12885580. ^ File SE, Hartley DE, Alom N, Rattray M 2003. Soya phytoestrogens change cortical and hippocampal expression of BDNF mRNA in male rats. Neurosci. Lett. 338 2: 135-8. doi:10.1016/S0304-39400201391-5. PMID 12566171. ^ White LR, Petrovitch H, Ross GW, et al 2000. Brain aging and midlife tofu consumption. J Am Coll Nutr 19 2: 242-55. PMID 10763906. ^ Dethloff L, Barr B, Bestervelt L, et al 2000. Gabapentin-induced mitogenic activity in rat pancreatic acinar cells. Toxicol. Sci. 55 1: 52-9. doi:10.1093/toxsci/55.1.52. PMID 10788559. ^ Roebuck BD, Kaplita PV, Edwards BR, Praissman M 1987. Effects of dietary fats and soybean protein on azaserine-induced pancreatic carcinogenesis and plasma cholecystokinin in the rat. Cancer Res. 47 5: 1333-8. PMID 3815341. ^ Roebuck BD 1986. Enhancement of pancreatic carcinogenesis by raw soy protein isolate: quantitative rat model and nutritional considerations. Adv. Exp. Med. Biol. 199: 91-107. PMID 3799291. ^ www.news.com.au/dailytelegraph/story/0,22049,21054484-5001021,00.html Soy cancer warning By Clair Weaver January 14, 2007 The Daily Telegraph ^ http://jn.nutrition.org/cgi/reprint/125/2/212 Shaw N, Chin C and Pan W, 1995. A Vegetarian Diet Rich in Soybean Products Compromises Iron Status in Young Students, J Nutr 1252:212-219 While other studies shows that soybeans are high in phytic acid, which forms insoluble complexes with minerals such as iron, calcium, magnesium and especially zinc 1 i.e. blocks the uptake of essential minerals. External links Wikimedia Commons has media related to: Soybean Advocacy and nutritional information American Soybean Association Cornell University Food and Brand Lab Evaluation of Anti-Soy Data and Anti-Soy Advocates Guardian - There's no risk to humans from soya IITA has CGIAR global mandate for Soybean research for development International Institute of Tropical Agriculture Soy information at Soyatech Soy Heart healthy claims in dispute Soyinfo Center - SoyaScan database and books United Soybean Board Critical AlterNet: Health Wellness: The Dark Side of Soy Concerns Regarding Soybeans Guardian - Should we worry about soya in our food? 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