Diabetes is a metabolic disease, the so-called “lifestyle disease”, “rich disease”, is “eaten out” of the disease. We must adhere to a scientific diet, so how should we eat? What is the best diet for the body? Strict dietary control is a key part of the patient’s basic treatment. For diabetic patients, what can and cannot be eaten must ask the doctor to develop a plan. A good diet plan should be strictly enforced, only then can we prevent food hyperglycemia and drug hypoglycemia from occurring. Most of the diabetic patients around us are type 2 diabetic, and most of them are obese. A scientific diet plan is good for reducing weight, improving disorders of sugar and lipid metabolism and hypertension as well as reducing the dose of glucose-lowering drugs. We all know: sugar, fat and protein are the three major energy-supplying substances we need, and it is important to plan the amount of these three types of substances reasonably. Sugar accounts for about 50% to 60% of the total calories in the diet, fat accounts for about 30% of the total calories, while the protein content generally does not exceed 15% of the total calories. Sugar advocates the use of coarse rice, noodles and a certain amount of mixed grains, like corn porridge, nest, etc. Do not eat glucose, cane sugar, honey and its products (all kinds of candy, sweet pastry cookies, ice cream, sugary drinks), and do not eat high sugar content of groundnuts, and pumpkins sold in the market now, the pumpkin now contains too much sugar, which is not conducive to blood sugar control. Sugar consumption is generally about a steamed bun. The use of insulin or hypoglycemic drugs must be linked to the timing, amount and structure of the diet. Protein adult daily 0.8~1.2g per kilogram of ideal body weight [ideal body weight (kg) = height (cm) – 105]. The composition of protein should account for 1/3 of animal protein to ensure the supply of essential amino acids. Protein should also choose high-quality protein, such as fish can be consumed. The intake of saturated fatty acids in fat should not exceed 7% of the total energy of the diet, and minimize the intake of trans fatty acids. Monounsaturated fatty acids are a better source of dietary fat, and the energy supply ratio in total fat intake should reach 10% to 20%. The intake of polyunsaturated fatty acids should not exceed 10% of the total energy intake, and the intake of n-3 fatty acids rich in fatty acids should be increased appropriately. Vegetable oils contain more unsaturated fatty acids, but do not consume cottonseed oil. In addition, a variety of foods rich in soluble edible fiber can slow down the absorption of blood sugar after meals, thus reducing the postprandial blood sugar peak, and also improve gastrointestinal motility and prevent constipation, which is good for elderly people with combined cardiovascular and cerebrovascular diseases. The daily fiber content in the diet should not be less than 40g, advocating the consumption of green leafy vegetables, beans, root tubers, coarse grains, fruits with low sugar content, etc. Salt should be limited to 6g or less per day and alcohol consumption should be restricted. Developing a medication and diet plan may seem simple, but actually requires guidance from a medical professional with specialized medical knowledge. If diabetes is combined with hypertension and cerebrovascular disease, patients should be more cautious and careful to prevent complications.