There are many kinds of food which are beneficial to human health and can help people live longer, and soybean and peanut are two best examples.

First of all, soybean contains a large number of proteins, and the quality and quantity of these proteins can even be compared with that of meat, egg, milk and other animal products. As a result, it is known as a kind of "plant meat".

Soybean not only contains eight kinds of essential amino acids needed by human body, but is also rich in lysine, so it can supplement the lack of lysine in cereals. At the same time, soybean also contains plenty of oleic acid and linoleic acid. These two kinds of unsaturated fatty acids can lower the level of cholesterol, and is very beneficial for the prevention of vascular sclerosis, hypertension and coronary heart disease. What's more, soybean also contains a large number of phospholipids, choline and other nutrients which have some health-care effects on the nervous system.

In addition, soy saponin can prevent the formation of lipid peroxide and slow down the aging of the body. Soybean lecithin has special effect in the prevention and treatment of memory loss and senile dementia. According to the report, people who eat more soybeans tend to live longer than other people. As a result, soybean is an indispensable food for the elderly people.

Besides soybean, peanut is also a good "longevity food" for elderly people. Early in the ancient China, it has been believed that peanut has the effect of nourishing the body and prolonging human life. Peanut is as nutritious as soybean. It contains a high content of protein, which is up to about 30%, and its nutritional value can even be comparable to some animal food such as egg, milk, lean meat and so on. What's more, peanut is rich in fat, lecithin, arginine, vitamin A, vitamin B, vitamin E, vitamin K, as well as calcium, phosphorus, iron and other elements.

Peanut also has very high medicinal value. Traditional Chinese medicine believes that eating peanuts can promote appetite, nourish spleen, eliminate phlegm, nourish vitality, and so on. It is especially suitable for people who suffer from malnutrition, stomach disorders and cough. According to modern medical research and clinical application, it is found out that peanut oil contains a high content of unsaturated fatty acids, which not only can lower the level of cholesterol in the body, but is also very effective in the prevention of atherosclerosis and coronary heart disease. In addition, peanut can inhibit the dissolution of fibrin, promote the neogenesis of platelets and strengthen the contractile function of capillaries. As a result, it can be used to treat thrombocytopenia, urinary tract bleeding, gum bleeding and other bleeding disorders.