Walnuts as food, there is no efficacy and effects and contraindications. However, walnuts have high nutritional value, appropriate intake can supplement the body’s fat and other nutrients needed, more favorable to health. Walnuts belong to a kind of food with high nutritional value, in which every 100g of walnuts, protein is 15.8g, fat is 65.5g, carbohydrate accounts for 12.1g, as well as varying amounts of copper, iron, vitamins, folic acid and other nutrients. Since the food does not have any efficacy or effect, there is no effect as well as contraindication of walnuts. If a normal person consumes walnuts appropriately, it can replenish more nutrients and have certain benefits to the human body. However, it should be noted that the need to combine their own situation, appropriate intake of walnuts, do not overeat, so as not to aggravate the burden on the gastrointestinal tract, is not conducive to good health; or lead to excessive calorie intake, triggering obesity. If there are symptoms of physical discomfort, it is recommended to go to the regular hospital in a timely manner, so as to clarify the cause of the disease, and actively take relevant treatment measures. People who are allergic to walnuts should not eat walnuts.