Ways to enhance resistance are:
Sleep well. If you sleep less than 7 to 8 hours a day, your chances of getting sick may increase. Exercise more: Regular moderate-intensity exercise can enhance the function of the immune system, because physical exercise can relieve emotions and reduce stress.
Aerobic exercise is also effective in improving immunity.
Nutritional supplements:
We should eat more foods rich in protein, such as lean meat, milk, fish, shrimp and beans. Vitamin supplements can include strawberries, tomatoes, cucumbers, carrots and other fruits and vegetables rich in vitamin C.
Eat some animal liver. Nutritionists believe that animal liver is rich in many substances that help to promote immune function, such as folic acid, selenium, zinc, magnesium, iron, copper, B6 and B 12.