For example: dieting to lose weight. It is very dangerous to eat fruit instead of staple food. Not only can it not play a role in beauty, but it may also cause anorexia. The essential nutrients for the human body are not only contained in fruits and vegetables, but also can meet the needs of the human body. The metabolism of the human body needs a certain amount of energy to supplement it. The energy of human body comes from three nutrients: protein, fat and carbohydrate. Therefore, it is very important for people's health and bodybuilding not to be overnourished, but also to meet the needs of human metabolism to ensure the nutritional balance, pH balance and electrolyte balance of human body. Therefore, it is not advisable to take dieting as the main means to achieve the purpose of slimming. In the long run, it is not only bodybuilding, but also harmful to the body.