Carbohydrate staple foods include rice, brown rice, glutinous rice, noodles, cereals, bread, steamed bread and so on. Carbohydrates are a large class of compounds composed of three elements: carbon, hydrogen and oxygen, which is a basic substance for maintaining human life activities, and the content of carbohydrates is relatively high among daily staple foods. People can absorb and utilize part of it to maintain their physiological activities. Carbohydrates per 100g of food: 25.9g in rice, 25.58g in brown rice, 78.3g in glutinous rice, 59.5g in noodles, 69.4g in cereals, 58.6g in bread, and 49.8g in steamed bread. In addition to staple foods, some starchy vegetables also contain some carbohydrates, such as sweet potatoes, potatoes, purple potatoes, pumpkin and so on. It is recommended to enrich the variety of food as much as possible in the daily diet, to balance the nutrition, and to absorb all kinds of nutrients in a comprehensive way.