2, carbohydrates (carbohydrate) is composed of carbon, hydrogen and oxygen three elements, because it contains the ratio of hydrogen and oxygen for two to one, and water, it is called carbohydrates. It is the cheapest of the three main nutrients that provide heat for the body. Carbohydrates in food are divided into two categories: effective carbohydrates that can be absorbed and utilized by human beings, such as monosaccharides, disaccharides and polysaccharides, and ineffective carbohydrates that can not be digested by human beings, such as cellulose, which is a necessary substance for the human body.
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