Carbohydrates are the most abundant organic compounds in nature, composed of three elements: carbon, hydrogen and oxygen, and are called carbohydrates because they contain the same ratio of hydrogen to oxygen as water. It is one of the three basic substances in the biological world, providing the main energy for biological growth, movement and reproduction, and is one of the important substances essential to the survival and development of human beings.

The first type of carbohydrate-containing food is often eaten cereals, such as rice, millet, oats, buckwheat, corn. The second type of food is potato food, such as sweet potatoes, white potatoes, potatoes, taro. The third food group is often eaten fruits, such as apples, peaches, bananas, pears, these sweet-flavored fruits also contain a lot of carbohydrates, providing the body with a very rich sugar. The fourth food group dairy products: lactose in dairy products is also one of the disaccharides, and is therefore also a source of carbohydrates.