plays an important role in the process of fighting against diseases. The level of human immunity is affected by many factors, among which nutrition plays a very important role. Nutrition of

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is the material basis for maintaining normal immune function and health of human body. Malnutrition can lead to the impairment of immune system function and the decline of resistance to pathogens, thus promoting the occurrence and development of infection. Therefore, reasonable nutrition can improve the immune status of the human body, enhance the resistance to diseases, which is of great significance to prevent the occurrence of diseases. Nutrients closely related to immune function include protein, vitamin A, vitamin C, vitamin E, iron, zinc and selenium. Protein

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are the material basis of immune function. Insufficient protein intake affects tissue repair, reduces the local immunity of skin and mucous membrane, and weakens the ability to eliminate pathogens, which is easy to cause the propagation and diffusion of pathogens and reduce the ability of anti infection. With the improvement of living conditions, protein deficiency is not common, but it is easy to appear in diet and partial diet. The protein contained in animal food (including the protein in soybean and its products) is easier to be fully utilized by human body than plant protein. Therefore, we should eat some animal food properly every day. Vitamin A plays an important role in the immune system. Vitamin A deficiency can cause keratosis of respiratory, digestive, urinary and reproductive epithelial cells, destroy its integrity, and be vulnerable to bacterial invasion, which increases the susceptibility of the body to respiratory and intestinal infectious diseases. Foods rich in vitamin A mainly include animal liver, such as sheep’s liver, pig’s liver, chicken’s liver, etc. plant food can only provide vitamin a protocarotenoids, which can be converted into vitamin A in the body. Carotene is mainly found in dark green or red yellow vegetables and fruits, such as carrots, spinach, celery, mango, sweet potato and so on. Vitamin E

vitamin E can improve the immune function and the resistance to infection. The main food sources of vitamin E are vegetable oil, germ of plant seeds, nuts, beans and cereals. Vitamin C is an essential vitamin for the human immune system, which can enhance the body’s ability to resist infection in many ways. The deficiency of vitamin C will reduce the function of immune system. Vitamin C is an essential auxiliary substance for collagen synthesis, which can improve the blocking effect of organism tissues against foreign pathogens. Vitamin C can also promote the production of lymphoblasts and immune factors. Vitamin C can promote the production of interferon, inhibit the synthesis of new viruses, and has antiviral effect. Fresh vegetables and fruits are rich in vitamin C. Such as fresh jujube, green pepper, kiwi fruit, spinach, hawthorn, citrus, grapefruit, strawberry, etc. Iron deficiency may lead to anemia and reduce the ability of anti infection. Iron rich foods are: animal blood, liver, soybeans, black fungus, sesame paste is rich in iron. Zinc

6. Zinc

zinc has a variety of physiological functions, especially in the development of the immune system and the maintenance of normal immune function. Proper intake of zinc can enhance the immune function of children, the elderly and some special patients. It plays an important role in the prevention and treatment of gastrointestinal and respiratory tract infectious diseases and parasitic diseases. Shellfish, red meat and animal viscera are good sources of zinc.

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7. Selenium

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selenium exists in almost all immune cells, and selenium supplementation can significantly improve the immunity of the body. In recent years, it has been found that selenium intake below the optimum amount can damage the development and function of the immune system and reduce the ability of anti infection. Previous studies have shown that the effects of vitamin E and selenium on the immune system are independent of each other, but the combination of vitamin E and selenium can enhance the immune response. On the contrary, the simultaneous deficiency of vitamin E and selenium can lead to a significant decline of immune response.

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