If it is not bad health, but weak resistance, you can try to bask in the sun. Often not sunbathing or less sunbathing will lead to the lack of vitamins A and E in the body, thus reducing resistance. Eat more seasonal fruits and vegetables, and eat fresh ones. In fact, seasonal vegetables and fruits provided by nature are the best sources of resistance and health. Drink more warm water at ordinary times, and keep the intake of more than 2L every day. When drinking water, put a few jujubes, scratch them with a knife, soak them, and replenish qi and blood. Also have a good living habit, don't smoke or drink, sleep at least 8 hours a day, it would be better if you could take a nap, don't be too anxious, don't be impatient, be normal. If you often face the computer, it may also be the original intention of the decline in resistance, because the radiation of the computer will absorb red blood cells, leading to an increase in white blood cells. Putting a pot of green plants next to the computer can prevent radiation and is good for your eyes. The balance of vitamins is also a way to improve immunity. Buy him a bottle of 2 1 gold and eat something nutritious. You can eat some every week, such as fish soup, chicken soup and tremella soup. Improving immunity means adhering to good living habits and eating habits for a long time. Wish you good health.