Walnuts are rich in protein, fat, carbohydrates, and contain essential trace elements and minerals such as calcium, phosphorus and iron, as well as carotene, riboflavin and other vitamins. The main component of the fat contained in them is glycerol linoleate, which does not raise cholesterol after eating, and can also reduce the absorption of cholesterol in the intestine. Therefore, it can be used as a tonic for patients with high blood pressure and arteriosclerosis. For elderly people with loss of appetite, weakness of the waist and knees, and general weakness, 1-2 walnuts can be eaten in the morning and evening every day, which can play a tonic therapeutic role. Walnuts can be eaten in a variety of ways, i.e. raw, cooked, or as a medicinal congee, decoction, etc.