If you don't eat foods rich in carbohydrates, it may cause insufficient supply of carbohydrates in your body. In the long run, hypoglycemia will come uninvited. Hypoglycemia is very harmful to human body, especially to nervous system. Slight hypoglycemia can lead to dizziness, cold sweat and bad mood.

Carbohydrate consists of three elements: carbon, hydrogen and oxygen. Because the ratio of hydrogen to oxygen is two to one, which is the same as water, it is called carbohydrate. It is the cheapest of the three main nutrients that provide heat energy for human body. Carbohydrates in food can be divided into two categories: effective carbohydrates that people can absorb and utilize, such as monosaccharides, disaccharides, polysaccharides and ineffective carbohydrates that people can't digest, such as cellulose, which are essential substances for human body.