Human immunity is greatly influenced by the environment, such as diet, sleep, exercise, and stress. Among them, diet has an important influence because food components can help stimulate the immune system and enhance immunity. Lack of these important nutrients can seriously affect the body’s immune system function. Here we list some immune enhancing foods: 1. Garlic. The allicin in it has a strong bactericidal effect and can kill cold and flu viruses. Allicin, which is commonly used in transplant patients, is extracted from garlic. 2, mushrooms. It is rich in the mineral selenium and antioxidants and B vitamins, riboflavin and niacin, which can promote the production and activity of white blood cells. Among them, white mushrooms antiviral, antibacterial, anti-tumor effect is particularly significant. 3, fish and shellfish. Oysters, lobsters, crabs and clams and other seafood products can improve the body’s immunity to viruses by supplementing with selenium. Omega-3 in fish oil can help the blood to produce a large number of antiviral cells, also help to improve the body’s immunity. Omega-3 fish oil fat milk injection has anti-inflammatory and immunomodulatory effects in clinical practice. 4. Yogurt. It contains probiotics to protect the intestinal tract from disease-causing bacteria. Leukemia patients several long-term intestinal disinfection drugs are used can be complicated by intestinal flora dysbiosis, lactobacillus / bifidobacteria yogurt on human intestinal flora can maintain the intestinal flora ecological balance, protect the intestinal biological barrier, so that the invasion of harmful bacteria on the intestine is inhibited. Clinically commonly used Bifidobacterium trisporus enteric solution capsule is bifidobacterium, lactobacillus acidophilus, enterococcus faecalis by the appropriate combination of live bacteria preparations for intestinal flora imbalance caused by diarrhea and abdominal distension. 5, sweet potato. Rich in antioxidants, vitamins, folic acid, calcium, copper, iron and potassium. For the immune system to enhance the role of self-evident, which antioxidants play a role in the prevention of heart disease and cancer. Sweet potatoes are an excellent food source of beta carotene, which plays an important role in the repair of connective skin tissue. In addition sweet potatoes help the body make enough white blood cells to fight infections caused by the invasion of cold and flu viruses. 6.Grapefruit. Rich in vitamin C and a large number of flavonoids, can increase the vitality of the immune system, and can treat colds and flu and other diseases. 7, broccoli. The chemicals in it can stimulate the immune system and improve the vitality of the immune system. Rich in vitamin A, vitamin C and glutathione, it is very useful for vision protection, immune system improvement and fighting aging. Nutrition, disease and immunity are causative and complementary to each other. Food is the material basis for improving the defense function of our immune system, enhancing the immune function of the body, improving the body’s ability to fight diseases, and denying various diseases from taking advantage of the situation.