1. It is not advisable to lose weight by cutting off carbohydrates, which is very harmful to health. Carbohydrate is composed of carbon, hydrogen and oxygen, and 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 all essential substances for human body.

2. Carbohydrate is the main source of energy for all living things to sustain life activities. It is not only a nutrient, but also some of them have special physiological activities. For example, heparin in the liver has anticoagulant effect; The sugar in blood type is related to immune activity, so it can be said that carbohydrates are necessary to maintain the normal physiological function of the body.