Walnuts are not fruits, but dried fruits. Walnut is rich in protein, fat, carbohydrates and various trace elements and minerals, among which linoleic acid and DHA are essential nutrients for the development of brain and visual function, and trace elements zinc and manganese are important components of pituitary gland. Therefore, eating walnuts in moderation has certain brain-strengthening and intelligence-improving effects.

Walnut also contains a lot of unsaturated fatty acids, which can effectively reduce the human body's resistance to insulin, so it can effectively reduce the human blood sugar and has a certain therapeutic effect on diabetic patients.

Walnuts are also rich in walnut oil, which can soften stools and lubricate intestines. It also contains a lot of crude fiber, which can absorb water and expand, stimulate intestinal movement, and is very effective in treating constipation.