Diabetes mellitus is a group of metabolic diseases characterized by high blood glucose. The main clinical manifestations of diabetes are excessive drinking, excessive urination, excessive eating and weight loss (“three more and one less”), as well as high blood glucose and glucose in the urine (normal urine should not contain glucose). Diet therapy is the basis of treatment for all types of diabetes. A part of light diabetes patients can control their disease with diet therapy alone, and the following are the dietary principles of diabetes. 1.Frequently use foods with high fiber content, such as unprocessed fruits and vegetables, etc. 2, it is advisable to eat grains and cereals; bean products food; mushrooms, pumpkin, bitter melon, etc. 3, eat less refined sugar food, such as condensed milk, preserves. 4, eat less fried, fried, crispy and pig, chicken, duck skin and other foods containing high fat. 5, should not be sugar; animal fat and high cholesterol food; drinking alcohol. 6, the diet should not be too salty, and eat less cholesterol-rich foods. Such as cashew, liver, kidney and other animal offal food. 7, cooking more steamed, boiled, cold, shabu-shabu, baked, roasted, stewed, brined and other ways. 8, cooking preferably with vegetable fats. 9, avoid obesity, maintain the ideal and appropriate weight. 10.Timing and rationing, each meal in accordance with the planned amount of food, not arbitrary increase or decrease. 11, high starchy food and Chinese and Western snacks should be eaten according to the planned portions, not at will. 12.Rice and fruits should be eaten appropriately, especially sweets should be paid extra attention. 13.Cooperate with long-term, appropriate exercise, medication and diet control. 14.If necessary, a little sugar substitute can be used to replace sugar flavoring.