Why should patients with chronic kidney disease have a low protein diet? When kidney function is normal, protein in food is digested, absorbed and decomposed, and some of the protein and amino acids are absorbed and used by the body to maintain the normal physiological function of the body, and some of them are decomposed to produce nitrogenous waste products such as urea nitrogen, which are excreted from the kidneys. In chronic kidney disease, the ability of the kidneys to excrete these metabolic wastes is greatly reduced, so the protein catabolic wastes such as urea, creatinine, guanidine, etc. will accumulate in the blood and become uremic toxins. Reducing the protein intake of food, i.e. low protein diet, can reduce the production and accumulation of proteolytic metabolites, thus reducing the high workload of damaged kidneys and delaying the progression of renal insufficiency. Therefore, low-protein diet therapy is an important tool for non-dialysis treatment of patients with chronic kidney disease. When is it appropriate to start a low protein diet? The onset and progression of chronic kidney disease is a very slow process. Early treatment of chronic kidney disease is very important for the development and prognosis of the disease. The current accepted view is that protein restriction in the diet should be started as soon as kidney function is impaired. What should I pay attention to when adhering to a low protein diet for a long time? A reasonable low-protein diet can enable patients with chronic kidney disease to avoid malnutrition, and the following points need to be noted in daily life: 1. A low-protein diet is not an unlimited low: in general, ensure 0.6~0.8g protein/kg body weight per day. 2, low protein diet must have 50% from high quality protein: such as milk, eggs, fish, poultry, meat and soybean products. The rest of the protein is provided by cereals, vegetables, fruits, etc. 3.Must ensure enough calories: 30~35 kcal//kg body weight per day to maintain the ideal weight as the principle. 4.Foods with high calories and low protein content should be consumed as much as possible: such as white potato, yam, taro, pumpkin, lotus root powder, potato, etc. When patients eat less calories, they can add some foods with high sugar content such as honey, glucose, or vegetable oil to increase calories and meet the basic needs of the body. In addition to this, pay attention to calcium supplementation, 1g~1.5g of calcium per day, while limiting the intake of phosphorus. Vitamin supply should be sufficient.