Black beans are rich in nutrients, including protein 36. 1g, fat 15.9g, dietary fiber 10.2g, carbohydrate 23.3g, calcium 224mg, magnesium 243mg, potassium 1377mg and phosphorus 500mg, which are essential vitamin B for human body. Black beans are the most abundant health products in plants. The content of protein in black beans is more than twice that of beef, chicken and pork, and 12 times that of milk, which is not only high in protein, but also of good quality. The amino acid composition of black bean protein is similar to animal protein, and it is rich in lysine, which is close to the proportion needed by human body and easy to digest and absorb. Black bean fat contains more unsaturated fatty acids, has a low melting point, is easy to digest and absorb, and will not be deposited on the blood vessel wall. Its biggest feature is that it contains phytosterol, which is not only absorbed by human body, but also inhibits the absorption of cholesterol. Therefore, black beans are ideal health care products for middle-aged and elderly people with arteriosclerosis. The calcium rich in black beans is an excellent source of calcium supplement for human body. Potassium has the function of maintaining osmotic pressure inside and outside cells and acid-base balance of human body, and can eliminate excess sodium in human body, thus effectively preventing and reducing hypertension. Iron in black beans can prevent iron deficiency anemia, and iodine can prevent goiter. Molybdenum can inhibit the synthesis of nitrosamines, a strong carcinogen in human body. Studies have shown that isoflavones in black beans are phytoestrogens, which can effectively inhibit breast cancer, prostate cancer and colon cancer, and are also helpful for the prevention and treatment of osteoporosis in middle-aged and elderly people. Bean skin and bean dregs contain cellulose, hemicellulose and other substances, which can prevent constipation and enhance gastrointestinal function. The glycemic index of black beans is very low, only 18, while the staple food of China people, rice and wheat steamed bread, is as high as 88, which is nearly five times that of black beans. Therefore, black beans are very suitable for diabetics, people with impaired glucose tolerance and people who want to control blood sugar. The nutrition and health care of soybean protein contains more lysine and less methionine. In rural areas dominated by plant foods, attention should be paid to the use of soy products with foods rich in methionine, such as rice, flour and other cereals and eggs such as chickens, ducks, pigeons and quails, which can improve the utilization rate of soy protein. When eggs and beans are eaten together, their nutritional value is comparable to that of meat protein. Soybean contains a fatty substance called linoleic acid, which can promote children's nerve development. Linoleic acid can also lower blood cholesterol, so it is a good food to prevent hypertension, coronary heart disease and arteriosclerosis. In addition, soybean is rich in B vitamins and inorganic salts such as calcium, phosphorus and iron. Although dried soybeans do not contain vitamin C, they can produce vitamin C after germination, which can be supplemented in the off-season of vegetables. Raw soybean contains antitrypsin factor, which affects the absorption of nutrients in soybean. Therefore, the cooking time of soybeans and foods made from soybeans should be longer than that of ordinary foods, and the nutritional value of soybean protein should be improved by destroying these factors at high temperature. The protein content of soybean is as high as 40%, and the quality can reach about 50%, which is more than twice that of lean pork and three times that of eggs. The amino acid composition of soybean protein is close to the amino acid needed by human body, which belongs to complete protein, in which Lai contains more amino acids, about 35.8 mg of iron and 4 mg of phosphorus per 100 g of soybean. Some modern medical researches such as vitamin B 1b2de believe that soybean contains no cholesterol, which can reduce the occurrence of arteriosclerosis and prevent heart disease. Soybean also contains a substance that inhibits pancreatic enzyme, which has certain curative effect on diabetes. Therefore, soybean is recommended by nutritionists to prevent and treat coronary heart disease. Ideal health care products for diseases such as hypertension and atherosclerosis. Soft phospholipids contained in soybeans are an important part of brain cells. Eating soybeans regularly plays an important role in increasing and improving brain skills. Chinese medicine believes that taking soybeans can make people grow skin, benefit color, replenish essence, strengthen strength, replenish deficiency and stimulate appetite. It is a nourishing food suitable for the weak, and has the effects of invigorating qi and nourishing blood, invigorating spleen and regulating stomach, strengthening body constitution, calming heart, benefiting large intestine, moistening dryness and promoting diuresis.