1. From the point of view of nutrition, it shows that normal adults can supplement the decomposition of protein and maintain the total balance of nitrogen by ingesting 30-50g of protein from food every day, so the minimum physiological requirement of normal adults for protein is to supplement 30-50g of protein every day. Young men need about 56g in protein and 45g in protein every day. China Nutrition Society recommended that the daily protein requirement of adults is 80g. 2. For people after exercise, the intake of protein can be higher than that of ordinary people. But it is also best not to exceed 3g/kg human body mass. Ordinary bodybuilders are inferior to professional bodybuilders in terms of exercise intensity and amount of exercise, so they should make recipes according to their own conditions, and keep the daily intake of protein at about 2g/kg body mass. 3. Eating too much or too little in protein will not improve the effect of bodybuilding training. It will bring many side effects. The research shows that the intake of protein should not be too much, because protein has high special power function. Excessive intake of protein will increase metabolic rate, increase water demand and make the body easy to lose water. Ammonia is a metabolite of protein, which is a toxic substance. It is converted from the liver to urea, transported to the kidney through blood, and excreted with urine. It can be seen that excessive intake of protein will increase the burden of liver and kidney, which is not good for athletes. If the intake of protein is insufficient, it will often lead to the decrease of hemoglobin content and sports anemia. Therefore, the intake of protein should be balanced during exercise.