Carbohydrate is an essential nutrient for the body and is composed of three elements: carbon, hydrogen and oxygen. It provides heat to the body and is contained in many foods. However, the body needs a limited amount of carbon water, and excessive intake or insufficient intake can affect health. Carbohydrate is the cheapest nutrient that can provide the body with heat. The ratio of hydrogen to oxygen in this component is 2:1, which is similar to the nature of water, so it is also known as carbohydrate. There are many foods that contain carbohydrates, such as cereals, fruits, candies, dried fruits, beans, root vegetables, etc., which can help the body to replenish carbohydrate nutrition. But the amount of carbohydrate intake should be controlled, the intake of too much will be converted into fat accumulation in the body, making people too obese. However, if you do not consume enough carbohydrates in your diet, it can lead to weakness, fatigue, low blood sugar and other problems that can cause dizziness and coma. Adults need 50-100 grams of carbohydrate nutrition per day, so the intake of carbohydrate in the diet should not be lower than this standard. Only by consuming sufficient amount of carbohydrates can carbohydrate deficiency be effectively prevented. However, it is also important to control the intake, which can prevent obesity.