Walnut has the functions of tonifying kidney, strengthening waist, warming lung and relieving asthma, relaxing bowels, promoting glucose utilization, cholesterol metabolism and protecting cardiovascular system. It is mainly used to treat cough and asthma, lumbago, limp feet, impotence, nocturnal emission, frequent urination, stranguria, dry stool and other symptoms caused by kidney deficiency, and has excellent curative effect on patients with chronic bronchitis and asthma in winter. Eating walnuts regularly can not only strengthen the body, but also resist aging.