Modern medicine proves that normal people, after diet, as blood sugar rises, insulin secretion also increases, so that blood sugar drops and is maintained in the normal range, and therefore, diabetes does not occur. In the case of diabetic patients, due to the decreasing function of pancreatic islets, insulin secretion is absolutely or relatively insufficient, and insulin cannot increase with the rise of blood glucose after diet, so it cannot play an effective role in lowering blood glucose, so blood glucose exceeds the normal range. At this time, if you eat like a normal person, without diet control, or even excessive diet, it will make the blood sugar rise too high, and will have a negative impact on the islet tissue that is not secreted enough, so that the islet function is more reduced, the secretion of insulin is more reduced, thus further aggravating the condition. Therefore, the diabetic patients should be reasonable dietary control. First, the purpose of dietary therapy 1, reduce the burden on the pancreas, so that blood glucose, lipids to reach or close to normal values, and to prevent or delay the occurrence and development of complications. 2.To maintain health, so that adults can engage in various normal work and activities, and children can grow and develop normally. 3.Maintain normal weight. Obese people reduce energy intake, which can improve the body’s sensitivity to insulin. Lean people can make weight gain and enhance the body resistance. Second, the application of diet therapy points 1, diet therapy is the basis and cornerstone of the treatment of diabetes. Regardless of the type of diabetes, the severity of the disease or the presence of complications, whether treated with insulin or oral hypoglycemic drugs, should be strictly carried out and long-term adherence to diet control. For obese type 2 diabetic patients or older/lighter cases, diet therapy can be the main treatment method, and with the appropriate combination of oral hypoglycemic drugs, effective control of the disease can be achieved. For type 1 diabetes and severe cases, strict dietary control should be provided on the basis of insulin and other medication in order to get effective control of blood glucose and prevent deterioration of the disease. Only when the diet is well controlled can oral hypoglycemic drugs or insulin be used to better effect. Otherwise, relying on the so-called new drugs and ignoring food therapy, it is difficult to achieve good clinical results. 2, diet therapy should be adjusted at any time according to the condition, flexible control. Lean patients can be relaxed to ensure the total calories. Obese patients must strictly control the diet, mainly low-calorie fat diet, to reduce weight. For those treated with insulin, care should be taken to add meals at 9-10 a.m., 3-4 p.m. or before bedtime as appropriate to prevent hypoglycemia. Attention should also be paid to increase the main meal or additional meals when physical work or activities are more. 3. Diet therapy should be scientific and reasonable, not too much and not enough. Neither subjective arbitrary, nor too strict restrictions, carbohydrate daily intake of at least 150 grams, a little carbohydrates are afraid to eat, but aggravate the condition, and even ketosis. According to the patient’s condition, weight and height, strict calculation should be made, and the diet should be arranged scientifically and reasonably under the premise of controlling the total calories, so as to achieve the purpose of meeting the minimum needs of the human body and controlling the total calories at the same time. 4.Scientifically arrange the main food and side food, and do not pay attention to the main food and ignore the side food. Although the main food is the main source of blood sugar and should be controlled, but the protein and fat in the side food can also be turned into blood sugar and become the source of blood sugar through the role of gluconeogenesis in the body as usual. Studies have shown that 58% and 10% of protein and fat are turned into glucose in metabolism respectively. These two types of side dishes too much, but also can make weight gain, the disease is not conducive, so the diet should also be a reasonable mix, in order to achieve the desired results. 5, choose good food suitable for diabetic patients, is very important for the control of diabetes. 6, eat less or no fruit. Because the fruit contains more carbohydrates, and mainly glucose, sucrose, starch. After eating digestion and absorption of fast, can quickly lead to a rise in blood sugar, is not good for diabetic patients. So diabetes generally should not eat more fruit. However, because fruits contain more pectin, which has the effect of delaying the absorption of glucose, you can eat less fruits when your condition is stable. When eating fruits, the principle of selection should be low in sugar content. Also, calculate its caloric energy according to its sugar content. Convert it into staple food and reduce or deduct the amount of staple food to keep the total calories unchanged. It is not advisable to eat fruit at every meal, and it is generally considered appropriate to consume small amounts between meals (when blood sugar is well controlled). Specifically refer to the nutrient composition table and use as appropriate according to your condition. 7.Limit the content of cholesterol in the diet. Because such foods tend to raise serum cholesterol, resulting in diabetic vascular complications, such as coronary heart disease. Therefore, diabetic patients should limit the intake of cholesterol in their diet, generally advocating that the cholesterol limit is less than 300 mg per day, and should not use or use less fatty meat and animal offal, such as heart, liver, kidney, brain, etc., because these foods are rich in high cholesterol. In contrast, you can consume lean meat and fish and shrimp, which are high protein and low fat foods.