Preface: Influenza is a common problem that people will suffer from nearly in any season. This article will recommend you five kinds of food, which can improve human immunity, and keep you away from a cold, so as to make you much healthier.

First, mushroom: promote white blood cells and fight against infection.
For a long time, mushroom has been regarded as a kind of food to improve human immunity. At present, the researchers have found out the reason for this: eating mushroom can promote the formation and activity of white blood cells, and make them more defensive.

Second, sweet potato: improve the resistance of the skin.
The skin is also a member of the human immune system. It is the primary protective screen of the body to resist against bacteria, viruses and other exterior violations. Vitamin A plays an important role in the connective skin tissue, while the best way to supplement vitamin A is to obtain enough beta-carotene from daily food. Sweet potato is the quickest way to get this kind of nutrition. It not only contains a large number of beta-carotene, but is also low in calorie.

Third, tea: fight against bacteria and prevent the flu.
The researchers of Harvard University have found out that, if people keep drinking five cups of black tea every day for two successive weeks, there will be a large number of antiviral interferon produced in their body. This kind of anti-infection protein can effectively help human protect against flu. At the same time, it can also reduce the symptoms of food poisoning, wound infection, beriberi and even tuberculosis and malaria. Of course, drinking green tea also has the same effect.

Fourth, garlic: allicin can resist against infection and bacteria.
The experimental results made by British researchers show that, eating garlic can reduce the occurrence of influenza by 2/3. In addition, people who often eat garlic are less likely to suffer from colon cancer and stomach cancer. As a result, it is suggested to eat some raw garlic every day. What's more, it is also a good choice to add some garlic when you are cooking the dishes.

Fifth, yogurt: probiotic bacteria can protect the intestinal tract.
Yogurt contains a high content of probiotics, which can protect the intestinal tract and avoid the generation of pathogenic bacteria. In addition, some yogurt contains lactobacillus, which can promote the growth of white blood cells in the blood.