Bodybuilders use 5-7 meals a day because they find that it can achieve better results. Eating more meals a day can make amino acids and glycogen flow into the body continuously. Amino acids can repair muscle tissue, and glycogen can ensure the high content of insulin and prevent muscle decomposition. On the other hand, if you only eat 3-4 meals a day, but at the same time, you should pay attention to adequate nutrition intake, which will promote the increase of body fat and make the blood sugar content fluctuate.