Citrus fruits are rich in vitamin C, which can increase the number of phagocytes. Strengthen the vitality of natural killer cells; Establish and maintain mucosa and collagen tissue to help wound healing. From the aspects of antivirus, antioxidation, protection and immunity enhancement, you can try grapefruit, watermelon and lemon. But eating more fruits can certainly improve your resistance, but it can only be effective if you stick to your usual eating habits, and the effect is slow.

You can also eat some vegetables, such as

Carrots, mangoes, sweet potatoes and other dark orange fruits and vegetables are rich in beta carotene, which can be converted into vitamin A in human body. Vitamin A can maintain the integrity of epithelial cells and mucosal tissues and reduce infection. Improve antibody reaction and promote leukocyte production; And participate in capturing free radicals that destroy cells.

Other fruits and vegetables that nourish the immune system include tomatoes, cruciferous vegetables, garlic and mushrooms.