Soybean is a leguminous plant, which is a kind of abundant food in China. There are many kinds. According to skin color, it can be divided into soybeans, green beans and black beans. Among them, soybeans are the main ones. Because soybean is rich in nutrition, it has the reputation of "king of beans" and "flower of nutrition". Soybean is rich in protein, which can be compared with animal foods such as meat, eggs and milk in quality and quantity, so it is also called "plant meat" and "green cow".

Soybean contains about 40% of protein, among which 8 kinds of essential amino acids are complete and suitable, so it is a high-quality protein. Soybean is rich in lysine, which can supplement the deficiency of lysine in cereals. The fat content in soybeans is also as high as 20%. It is superior to animal fat because it is rich in oleic acid and linoleic acid. This unsaturated fatty acid has the function of lowering cholesterol, which is of great benefit to prevent arteriosclerosis, hypertension and coronary heart disease. Soybean is also rich in phospholipids, choline and other substances that have health care effects on the nervous system, as well as anti-aging substances such as vitamin E. Soybean also contains arginine, which is an important raw material for making sperm. Soybean saponin can prevent the formation of lipid peroxide and delay the aging of the body. Soybean phospholipids have special effects on preventing and treating Alzheimer's disease and memory loss. Eating more beans can prevent obesity and enhance endurance. According to reports, many people live long in places rich in soybeans, so soybeans are an indispensable food for the elderly and recommended by longevity food for health care. In recent years, medical researchers have found that soybeans also have anti-cancer effects. Soybean, licorice and chemical drugs can reduce the side effects of anticancer drugs, so it can be used as adjuvant therapeutic food for chemotherapy or radiotherapy.

Chinese medicine believes that soybean is sweet in taste and flat in nature, and has the effects of invigorating spleen and appetizing, moistening dryness and promoting diuresis, expelling pus and detoxifying, reducing swelling and relieving pain. "Secret Records of Life Extension" states that "taking soybeans" can make people "grow skin and benefit qi and color. Make up bone marrow, add strength, make up deficiency and eat. " People often use soybeans to prevent and treat diseases, such as preventing and treating colds: soybeans 1 bar, 50 grams of dried coriander (or 3 onions), 3 slices of radish, warm soup; Treatment of habitual constipation: soybean phospholipid 1 dose, daily 1 dose, decocted in water for 3 times; Treatment of diarrhea: use soybean skin to burn charcoal and grind it into powder, take 15g each time, twice a day.