When immunity is low, you can supplement the following foods: First, supplement high-quality protein. When the body is infected with bacteria or viruses, B lymphocytes can differentiate into plasma cells, which secrete antibodies to fight against viruses and bacteria, and protein-based foods can increase the synthesis of antibodies. Secondly, when the immunity is low, you can increase the food such as enoki mushroom, mushroom, shiitake mushroom and fungus, which can effectively improve the immune function of the body. Third, you can eat strawberries, blueberries and other foods, these foods are rich in anthocyanins, which can improve the body’s metabolism and enhance immunity.