Adults with poor resistance can take vitamin help, including multivitamins or Vc, or take food supplements, such as:

(1) Fruits: oranges, kiwis, apples, cherries, grapes, bananas, etc.

(2) Fish: crucian carp, snakehead, sparerib soup and chicken soup.

(3) Fungi: mushrooms, straw mushrooms, fungus, etc.

At the same time, some milk, garlic and onions can be eaten together, so don't be picky about food. We should also exercise properly.