The basic purpose of dietary regulation in renal diseases: To reduce the retention of blood urea nitrogen. To prevent protein breakdown in the body and maintain the total nitrogen balance. Ensure the necessary nutrition, enhance resistance, slow down the development of the disease and reduce the combined evidence. Four principles of nutritional therapy for kidney disease I. Limit protein intake and provide as much high quality protein as possible. Limit cereal protein (vegetable protein), such as beans and their products, hard fruits and grains, etc. Use wheat starch (or corn starch) as the main food. Supplement with high-quality proteins, such as eggs, milk, lean meat, etc. And they are evenly distributed in three meals to better play the complementary role of protein. You can choose any food: potato, white potato, lotus root, water chestnut, yam, taro, pumpkin, vermicelli, lotus root powder, doughnut powder, rhizome powder, water chestnut powder, etc. Second, sufficient daily calories must be ensured. Take staple food as the main source of calories. If the patient eats less, sugar and vegetable oil can be added to the diet to meet the calorie intake. Patients in the acute stage usually cannot eat for the first 2~3 days, so intravenous fluids can be used to supplement the calorie and nutrient needs. The supply of potassium and sodium should be flexible according to the patient’s edema and condition. Fruits and vegetables should be used with caution in case of hyperkalemia, while the rest of patients can choose them at will. In cooking, a large amount of water can be used to remove some of the potassium. The amount of sodium intake depends on the patient’s degree of edema, and a salt-restricted diet should be used if there is sodium retention. If the urine volume exceeds 1500 ml in 24 hours, potassium should be supplemented as appropriate. For patients on dialysis therapy, the diet should be supplemented with protein as appropriate. Fourth, inorganic salts and vitamins should be consumed adequately.