[Introduction] 1. Controlling total heat energy is the first principle of diet therapy for diabetes. Second, supply the right amount of carbohydrates. Third, supply adequate dietary fiber. Fourth, supplement adequate vitamins and inorganic salts. Fifth, people with diabetes should not drink alcohol. Sixth, diabetic patients should arrange three meals a day reasonably, and each meal should contain carbohydrate, fat and protein, which is beneficial to slow down the absorption of glucose. Seven, should be controlled.