The human body needs to consume a certain amount of heat energy when maintaining life and various activities, and the energy consumed by the human body is greatly increased during bodybuilding training. The growth of muscle requires sufficient calories, because for every 0.45 kg (about 1 lb) of muscle, the body needs about 2500 kilocalories. In order to promote muscle growth, bodybuilders must consume more than 50 kcal/kg body weight/day. For example, a person weighing 60 kilograms needs to eat food that can provide 3000 kilocalories every day to gain 1 pound of muscle. If you eat less calories than you burn, you can't gain weight. Therefore, you need to eat more calories to maintain increased muscles.