1. Whole grains. In summer, you must eat a bowl of whole grains every day, which is not only good for your health, but also has a cosmetic effect, which can maintain the elasticity of your skin and delay aging. Whole grain rice, cereal buns and whole wheat foods can be eaten more, which can enhance the ability of metabolism and regulate the human immune system.

2. propolis. Propolis can improve the ability of human macrophages to swallow viruses and bacteria, and make the immune system in the best dynamic balance state, so it is called "natural immune enhancer".

3. spirulina. Its protein content is as high as 60%-70%, and it is rich in carotene, vitamin E and vitamin C, which can correct acidic constitution and improve human immunity.

4. mushrooms. Can promote leukocyte anti-infection. For a long time, people regard mushrooms as food to improve immunity. Now, researchers have found a reason to do this: eating mushrooms can promote the production and activity of white blood cells, making them more preventive.

5. Tomatoes tomatoes contain a variety of antioxidant factors, such as lycopene, carotene, vitamins E and C, which can improve human immunity. Experiments show that when people eat tomato juice for two weeks, the lycopene in their bodies will increase obviously and the immune function of lymphocytes will also be enhanced.

Extended data:

Middle-aged and elderly people should do outdoor sports reasonably and enhance their resistance. Outdoor activities can promote heat production, regulate metabolic function, enhance cerebral cortex excitement and thermoregulation. Exercise muscles properly, sweat and keep fit in winter. Exercise should be combined with exercise, and it is good to run and do exercises as long as you sweat slightly, which is contrary to the way of hiding the sun in winter.

Exercise should also be different according to individual physique and age. For example, patients with cardiovascular and cerebrovascular diseases should put an end to strenuous exercise such as playing ball and climbing mountains; People with respiratory diseases, such as chronic bronchitis, emphysema, pulmonary heart disease, etc. Sunny mornings and afternoons should be chosen to avoid cold stimulation and acute diseases.

The elderly should pay more attention to keep warm and avoid getting up early to exercise, so as to prevent stroke caused by insufficient blood supply to the brain.

Xinhuanet-What foods can enhance immunity?