Life aging is a process of gradual evolution with age, and the kidney is one of the organs that age earlier and more prominently. The study found that after the age of forty, the weight of the kidney began to decrease gradually, the renal tissue shrank, or renal cysts formed. Renal blood flow decreased progressively, and glomerular filtration rate decreased by about 1% every year. At the age of 80, the glomerular sclerosis rate increased significantly, the filtration rate was only half that of young people, and the renal reserve capacity decreased significantly. Once vomiting, diarrhea, fever and blood volume decrease, it is easy to cause a sharp decline in renal function and endanger life. There are two main aspects that affect the renal function of middle-aged and elderly people: First, obesity, hypertension, diabetes, hyperlipidemia and high uric acid are well known, that is, metabolic syndrome is a common disease of middle-aged and elderly people, which not only leads to cardiovascular and cerebrovascular sclerosis, but also is the culprit of renal arteriosclerosis. These diseases accelerate the process of kidney aging, and early and timely treatment and diet adjustment can prevent the development of diseases. Second, diet plays an important role in health care. Chinese medicine believes that overeating is a health taboo. With the development of China's economy and the adjustment of diet structure, the disease spectrum has also changed. According to statistics, diabetic nephropathy ranks first among dialysis patients with chronic kidney disease in developed countries; At present, chronic nephritis still accounts for the first cause of uremia in China, but the proportion of diabetic nephropathy is increasing year by year, which can exceed in a few years.