Carbohydrate can save protein: the carbohydrate in food is insufficient, and the body has to use protein to meet the energy required for physical activities, which will affect the body's use of protein to synthesize new protein and tissue renewal.

Therefore, it is totally inappropriate to eat meat instead of staple food, because there are few carbohydrates in meat, so that body tissues will use protein to generate heat, which is not good for health. Therefore, the minimum carbohydrate intake of dieters or diabetics should not be lower than 150g staple food.

Glycoproteins and proteoglycans in carbohydrates have lubricating effects. In addition, it can control the permeability of meninges. It is also the precursor of some synthetic biomacromolecules, such as purine, pyrimidine and cholesterol.

Extended data:

Carbohydrates ingested by the human body are digested into glucose or other monosaccharides, which participate in the metabolism of the body. There is no specific amount of carbohydrates in everyone's diet. Nutrition experts in China believe that the calories generated by carbohydrates should account for 60-65% of the total calories.

Usually, the carbohydrate intake is mainly polysaccharide, which is high in staple foods such as rice and noodles. While ingesting carbohydrates, other nutrients such as protein, lipids, vitamins, minerals and dietary fiber can also be obtained. However, the intake of monosaccharides or disaccharides such as sucrose cannot supplement other nutrients except calories.

References:

Baidu encyclopedia-carbohydrates