Walnut is a "rich mine" of copper, in which every100g of walnut kernel contains about 2mg of copper.
Walnuts are sweet and warm, and enter the lungs, kidneys and large intestine. As food, it is more suitable for mental workers who are physically weak, neurasthenia, forgetfulness, insomnia and dreaminess, accompanied by backache, fatigue and constipation, because it has the function of strengthening the brain and waist. Because walnut is a warm product, it is not suitable for people with yin deficiency and fire. Moreover, walnuts contain more vegetable oil components and have a good laxative effect. It is advisable to eat 2 ~ 4 tablets a day, not too much.