During the epidemic, the public is prone to reduced immunity due to inconvenient shopping and reduced exercise. A rich and reasonable diet can improve immunity appropriately. The general population should pay attention to the diversity of diet, mainly cereals, more fruits and vegetables, dairy, soybeans, moderate consumption of fish, poultry, eggs, lean meat. The elderly should try to ensure the supply of protein, and children should pay attention to vitamin D and vitamin A. When stocking up on food, you should also choose foods with high protein and easy storage to ensure balanced nutrition. At the same time, when cooking food should pay attention to less oil, less salt, the best way to cook more steamed, stewed, boiled, less fried, fried, grilled, drink more warm water, try not to drink high-sugar drinks.