We advocate appropriate dietary control in patients with renal disease based on the following considerations: long-term control of dietary protein and purine intake can significantly reduce glomerular hyperfiltration and hypermetabolism, thereby reducing the high pressure load on the residual renal units and delaying the deterioration of renal function. For patients with impaired renal function, controlling protein intake can also help to reduce proteinuria and improve metabolic acidosis; it has a better effect on preventing or improving endocrine disorders such as secondary hyperparathyroidism, directly or indirectly regulating the production of certain cell growth factors and certain vasoactive substances, and reducing inflammatory reactions in renal tissues, all of which are also beneficial to patients with chronic kidney disease in reducing their workload of the residual renal units. Since the salt intake of our population is significantly higher than the physiological metabolic needs of normal people, and since a high-salt diet is at the same time an important trigger for hypertension and calcium loss in the body, particular emphasis is placed on the control of salt in the diet. From the questions raised, it can be seen that the majority of patients have a general understanding of dietary therapy, and there are doubts about individual details. Generally speaking, kidney disease is divided into three groups of people, one is those who have been in remission and are still taking medication; the second is those who are not in remission but have normal renal function; and the third is those who have renal impairment, which can be divided into subgroups according to the status of residual renal function. All these patients are also categorized into two major groups based on normal or excessive body mass index (BMI). Whether patients with kidney disease need to control their diet depends mainly on three aspects: whether their condition is stable, whether their renal function is normal, and the degree of body mass index, blood pressure, blood glucose and proteinuria. If the condition has been controlled and stabilized, as long as the body mass index is normal, there is no need to strictly control the diet, but the salt intake should not exceed the standard (no more than 5-6 g/day). If the disease has not been controlled and stabilized, especially if there is a large amount of proteinuria, there is no need to strictly control the diet under the premise of actively cooperating with the treatment, only that it is not recommended to continue the high protein diet, because the long-term high protein diet will increase the workload of the kidneys and the degree of proteinuria, which will bring about unnecessary injuries. Those who really need to control their diet are those who have impaired renal function and/or are significantly overweight, as well as those with poor blood pressure and blood glucose control.