Skin is also a member of the human immune system, and it is the first barrier for the human body to resist external invasion such as bacteria and viruses. Vitamin A plays an important role in the process of connecting skin tissues. The best way to supplement vitamin A is to get beta carotene from food. Sweet potato is the fastest way to get this kind of nutrition, which is rich in beta carotene and low in calories.

2, beef: zinc supplementation to enhance immunity

Zinc is very important in the diet. It can promote the growth of white blood cells, and then help the human body to prevent harmful substances such as viruses and bacteria. Even a slight zinc deficiency will increase the risk of infectious diseases. Beef is an important source of zinc supplement for human body, so in winter, appropriate beef supplement can not only keep out the cold, but also prevent the flu.

3, mushrooms: promote white blood cells to fight infection

Eating mushrooms can promote the production and activity of white blood cells, making them more preventive. Mushrooms are foods with high protein, low fat, low calorie and high cellulose, which are suitable for middle-aged and elderly people suffering from hypertension and hyperlipidemia.

4. Fish and shellfish: Selenium supplementation to prevent viruses.

Selenium mainly comes from seafood such as oysters, lobsters, crabs and clams. Omega-3 in Atlantic salmon and other fish can help the blood to produce a large number of antiviral cells, and also help to improve human immunity.

5. Oats: Fiber-containing antioxidants.

Oats contain β-glucan, which has antibacterial and antioxidant effects. Eating oats can enhance immunity, accelerate wound healing and help antibiotics play a better role.

People's Network-World Immunization Week: Food to Enhance Immunity