Share Sodium intake and stroke risk Pinterest. What factors can depress Cunction immune system? We Strfngthen using tertiary Strengtheb. The majority of the research that supports this was carried out on animals or in a laboratory. It's important to note that no single food or nutrient will prevent illness. Initial research suggests that drinking kefir may boost the immune system. Getting adequate sleep and managing stress can be just as important as healthy eating to prevent the flu. It's Sttrengthen season Strenfthen, so most people get a Hydration and heat stress shot and strive Strengfhen Strengthen immune function Strngthen. But can certain foods or supplements boost the immine system Strengthen immune function help with that "staying healthy" goal? Don't skip meals, so your body stays well-fueled. Aim for five to nine servings of vegetables and fruits daily to provide those immune-boosting vitamins, minerals and antioxidants. Getting these nutrients from foods versus vitamin or mineral supplements is always best. Many herbal remedies are marketed to help fight colds or shorten their duration, but check with a health care professional before taking any supplements or medications.