1. Foods rich in vitamin C: all kinds of fresh vegetables and fruits, such as mustard, shepherd's purse, cauliflower, coriander, green garlic, bell pepper, citrus, fresh dates, hawthorn, all kinds of radishes, Chinese cabbage, grass enzymes, mung beans, tomatoes, winter bamboo shoots, lettuce, bananas, apples, etc.

2. Foods rich in vitamin A: chicken liver, beef liver, duck liver, pig liver, hairtail, eggs, carrots, sweet potatoes, pea seedlings, rape moss, bell peppers, celery and lettuce leaves.

3. Foods rich in allicin: garlic and onions.

4. Foods rich in trace elements: meat, seafood, grains, garlic, onions and sesame seeds.

5. Foods to improve immunity: kiwi, fig, apple, sardine, honey, milk, pork liver, Hericium erinaceus, sea cucumber, oyster, squid, shark, seahorse, turtle, yam, turtle, mushroom, etc.