Sugar is one of the main sources of human energy, but too much sugar intake will lead to weight gain, high blood sugar and excessive insulin secretion. In the process of fitness, too much sugar intake will affect the recovery and growth of muscles, because glycogen is one of the main energy sources of muscles. In addition, too much sugar intake will also lead to increased inflammatory response in the body, thus affecting the body's immune system.

Therefore, it is recommended to reduce the intake of sugar during fitness. If you need to replenish energy, you can choose some healthy snacks, such as fruits, nuts, yogurt and so on. These foods are rich in protein, fiber and other nutrients, which can help you control your weight better and keep healthy.