According to the biological principle, there is a large amount of protein in eggs, which is digested in the digestive tract, and the surplus kidney is deaminated by deamination to generate urea, which is excreted with urine. Excessive intake of protein, the excess protein is first converted into sugar, and then into fat, so an egg a day is the best, which can not only meet the needs, but also will not increase the weight and burden on the kidneys.