Carbohydrate is the main source of energy needed by organisms to maintain life activities. It is not only a nutrient, but also some carbohydrates with special physiological activities, which are mainly divided into effective carbohydrates and ineffective carbohydrates. Effective carbohydrates can be absorbed and utilized by the human body, such as starch and sugar, while ineffective carbohydrates cannot be digested and absorbed by the human body, such as cellulose.

The main food sources of carbohydrates are sugars and grains, such as brown rice, wheat, corn, barley oats, sorghum and so on. Fruits, such as sugarcane, melons, watermelons, bananas and grapes, are also rich in carbohydrates. Dried fruits, dried beans and root vegetables, such as carrots and sweet potatoes, are also sources of carbohydrates.

In fitness, the role of carbohydrates is mainly reflected in the following aspects:

Provide energy: carbohydrate is one of the main energy sources of the body and is very important to maintain the ability of high-intensity training. Eating enough carbohydrates during training can provide enough energy to support muscle movement and prevent fatigue and premature stop training.

Promote muscle repair and growth: carbohydrate intake can also increase insulin level and promote protein synthesis and muscle repair. After strength training, the body needs a lot of protein and carbohydrates to repair and recover, so that muscles can grow and adapt to training.