How can one improve immunity and resistance?

1. Eat more foods rich in antioxidants, such as fresh fruits and vegetables, red grains, soy products, and ocean fish. 2. Exercise regularly to enhance oxygen circulation in the body, boost immune system function, and promote metabolic balance. 3. Maintain sufficient sleep; rest and sleep help bodily maintenance and recovery, effectively enhancing immune system activity. 4. Supplement with adequate vitamin D, which helps cells support normal immune system function and thereby improves resistance. 5. Eat smaller meals and chew thoroughly; thorough chewing increases saliva secretion, enhances digestive system function, and aids nutrient absorption and overall health. 6. Consume more foods rich in vitamin C, such as oranges, tomatoes, celery, and other vegetables, which help strengthen immunity and resistance.