Soybean is rich in protein and calcium, with less saturated fat and no cholesterol than meat. Proper consumption contributes to the health of silver-haired people. Some scholars in China also suggest eating whole soybeans with complete nutrients as much as possible. Jiang, a professor at National Taiwan University's Institute of Food Science and Technology, pointed out that lecithin contained in soybeans can reduce the body's low-density lipoprotein, which is bad cholesterol, and reduce the risk of cardiovascular disease. Isoflavones contained in beans can not only supplement hormones for menopausal women, but also help prevent osteoporosis. Therefore, moderate consumption is beneficial to the health of silver-haired people. According to the research of scholar Zhang Huizhen, soybean not only contains many important nutrients, including protein, oil, sugar, vitamins and minerals, but also contains dietary fiber and lecithin, which are not enough in modern people's diet. Recently, researchers reported that soybean also contains some trace substances with medicinal functions, such as saponins with weight loss function, phytosterols with blood cholesterol lowering function, and vitamin E with antioxidant and anti-aging functions. At the same time, soybean oil also contains linolenic acid which can inhibit platelet aggregation and prevent arteriosclerosis. This fatty acid has also been found to have an important relationship with immunity. Data show that the Chinese nation is the first nation to know and use soybeans. According to Li Shizhen's Compendium of Materia Medica in the Ming Dynasty, the production of tofu was invented by King Huainan in the Western Han Dynasty, and the history of eating soybeans has been known for at least 2,000 years. Some people call this protein-containing food "the meat of the poor" and it becomes a cheap source of plant protein and oil. Many vegetarians don't eat fish, meat or even milk and eggs. Most of the protein they need every day is obtained from soybeans and their products. Therefore, soybeans are often called "meat grown from farmland". Some studies have pointed out that soybean contains about 25% sugar, but it is not starch. But cellulose and hemicellulose of polysaccharide and pentose of oligosaccharide. These sugars have the benefit of improving the glucose tolerance of diabetic patients. Scientists have confirmed that soybean fiber is beneficial to regulating blood sugar, even if the intake is 25~30g, it will not affect the absorption of minerals. It is estimated that every 100g soybean contains about 5g fiber. If you eat a little cooked soybean (about 2 tablespoons) every day, it will not affect the absorption of minerals, but also get some dietary fiber and a variety of good food ingredients, which is good for preventing diabetes and obesity. Abroad, the US Food and Drug Administration has allowed soybean food to be labeled as "Eating 25 grams of soybean protein every day with a diet low in saturated fatty acids and cholesterol can reduce the risk of heart disease". Jiang said that silver-haired people can achieve health care by drinking one or two cups of 500 ml soybean milk every day.