They are the main types of carbohydrates. (l) Monosaccharide, the simplest sugar that cannot be hydrolyzed, is divided into C, D, E and hexose according to the number of carbon atoms in its molecule. For example, glucose and fructose (C6H 12O6) are hexose, and ribose (C5H 10O5) is pentose. According to the structure, it can be divided into aldose (glucose, ribose) and ketose (fructose). Monosaccharide has the commonness of aldehyde or ketone, and also has the commonness of alcohol. Monosaccharide is reducible and can react with newly generated copper oxide suspension by silver mirror. Monosaccharide is a sweet colorless crystal. (2) disaccharide-an organic substance condensed from two monosaccharide molecules, is the product of hydrolysis of the most common oligosaccharide (also known as disaccharide). The most important ones are sucrose and maltose (c12h2o11), which are isomers of each other. They are all sweet colorless crystals, the difference is that maltose is reducing while sucrose is not. (3) Polysaccharide-a polymer formed by condensation of many monosaccharides, which can be obtained after hydrolysis. The molecular weight of polysaccharide is not fixed, and the relative molecular weight of a polysaccharide has a certain range. Polysaccharides are amorphous, insoluble (cellulose) or only soluble in hot water (starch), and have no sweetness and reducibility. The important polysaccharides are starch and cellulose, and their molecular general formula is (C6H10O5) n.

Eating in moderation when losing weight is a necessary supplement to maintain the normal operation of the body, and it must be moderate.