The foods that middle-aged and elderly people often eat to improve human immunity mainly include the following categories:

1. Animal proteins, such as fish, shrimp, milk and poultry;

Second, coarse grains, such as millet, wheat, soybeans, etc.

3. Fresh vegetables and fruits, such as okra, spinach, bitter gourd, blueberry and pitaya. Fresh fruits and vegetables are rich in vitamin A and vitamin B.

1, vitamin B 1

2, vitamin C, vitamin E, etc. It can obviously improve the immunity of the human body. Intravenous injection of thymosin and gamma globulin can also improve human immunity. Conditional middle-aged and elderly people can also buy supplements such as Ganoderma lucidum, Cordyceps sinensis, mushrooms, fungus, bird's nest and protein powder to improve immunity.