Soybean and Its Usages

Soybean is the most widely grown and utilized legume in the world and one of the most well researched, health-promoting foods available today. Containing about 40% on the dry weight-base of protein, 35% of carbohydrate, 20% of oil and about 5% of ash, it is one of the richest and cheapest sources of vegetable protein provided for millions of people, an important source of vegetable oil and also ingredients for hundreds of chemical products.

As an excellent source of protein, economically soybean is the most important bean in the world, the most nutritious and most easily digested food of the bean family. It contains a significant amount of essential amino acids, as well as a high levels of essential fatty acids including omega-3, numerous vitamins and minerals, including magnesium and iron, isoflavones, and fiber. Soy protein is the nutritional equivalent of meat and eggs for human growth and health, and with less saturated fat and cholesterol content, consuming soy protein tends to lower cholesterol levels, while consuming protein from animal sources tends to raise them. Just one cup of soybeans provides 57.2% of the Daily Value for protein for less than 300 calories and only 2.2 grams of saturated fat. Also, because soybean contains no starch, it is a good source of protein for diabetics.

Many processed foods use soybean as the primary ingredient, including many meat and dairy product substitutes, and baby foods. In Asia it is extensively consumed in the forms of soybean milk and tofu, fermented products such as soy sauce, tempeh, natto, and miso, sprouted for use as a salad ingredient or a vegetable and may be eaten roasted as a snack food.

Soybean may reduce the risk of colon cancer, possibly due to the presence of sphingolipids as well as fiber. The fiber in soybean is able to bind to cancer-causing toxins and remove them from the body. It also provides preventative therapy for several other cancers, including breast and prostate cancer. Soybean may also prevent high blood pressure, atherosclerosis, cardiovascular diseases, diabetes and obesity.

However, as with many dietary health claims, there are opposing viewpoints on the health benefits of soybeans. Some negative effects of soybean are reported, including allergic reactions, kidney or gallbladder problems due to measurable amount of oxalates, and thyroid problems. For human consumption, soybean must be cooked with "wet" heat in order to destroy the trypsin inhibitors{serine protease inhibitors}. It is not advisable to eat raw soybeans.

Soybean’s oil can be processed into vegetable oil, margarine, shortening, and vegetarian cheeses. It is also the primary source of bio-diesel in the United States. Industrially, the oil is used as an ingredient in paints, adhesives, fertilizers, sizing for cloth, linoleum backing, insect sprays, and fire extinguisher fluids. Soybean is also used in soap, cosmetics, resins, plastics, inks, crayons, and solvents. Since 2001 it has also been used as fermenting stock in the manufacture of a brand of vodka.