Carbohydrates exist in many foods, and common carbohydrate-rich foods include rice, noodles, and steamed bread. Carbohydrates are an organic compound composed of three elements: carbon, hydrogen and oxygen. Carbohydrates are able to provide the body with heat energy and are the main source of energy required to maintain all life activities of the organism. Carbohydrate-rich foods are mainly rice, noodles, steamed buns, rolls and other daily staples, but also include some miscellaneous grains, such as corn, sweet potatoes, potatoes and so on. In daily life, should be appropriate to eat carbohydrate-rich foods, dietary carbohydrate supply should account for 50% to 60% of the total calories, if eating too much may cause obesity, eating too little may cause insufficient energy supply.