The sugar content of wheat is about 75%, and protein accounts for about 10%. It has high nutritional value and is an important source of supplementing calories and plant protein.

2. Rice:

Protein amino acid composition in rice is relatively complete, which is easily digested and absorbed by human body. The disadvantage is low lysine content. (Generally, foods rich in protein contain lysine, such as meat, dairy products and beans, and yam, ginkgo, jujube, sesame, honey, grapes and lotus seeds also contain more lysine); The contents of inorganic salts, dietary fiber and B vitamins (especially vitamin B 1) in brown rice are higher than those in polished rice. The contents of protein, fat, vitamin B 1, vitamin B2, vitamin PP and minerals in rice with high processing precision are obviously lower than those in standard rice.

3. potatoes:

Potatoes are rich in vitamin A, vitamin C and minerals. The content of high-quality starch is about 16.5%, and it also contains a lot of lignin, which is known as the "second bread" of human beings. Its vitamin content is twice that of carrots, three times that of Chinese cabbage and four times that of tomatoes, and its vitamin C content is the highest among vegetables.

4. Corn:

Corn contains a variety of nutrients, among which the content of carotene, vitamin B2 and fat ranks first in cereals, and the fat content is twice that of rice and flour. Its fatty acid composition contains more than 50% essential fatty acid (linoleic acid), and contains more lecithin, sitosterol and abundant vitamin E. Therefore, corn has the functions of lowering cholesterol, preventing atherosclerosis and hypertension, stimulating brain cells, and enhancing brain power and memory. Corn also contains a lot of dietary fiber, which can promote intestinal peristalsis, shorten the time of food in the digestive tract, and reduce the stimulation of poison to the intestine, so it can prevent intestinal diseases.