Mushrooms contain selenium, deficiency of which may cause increased susceptibility to contracting a virus.
Sweet potatoes, and other orange foods like carrots, squash and pumpkin contain the antioxidant beta-carotene.
Almonds are an excellent source of vitamin E, another antioxidant responsible for supporting the immune system.
Yogurt contains live and active cultures called probiotics.
Leafy greens like spinach and kale are rich in a whole host of nutrients, including fiber, antioxidants and folate, which is especially important for immune function.
Green and black tea contain polyphenols and flavonoids, which are antioxidants that help fight disease.
Cabbage is a source of glutamine, which has been noted by many studies, including one in Nutrients journal, to strengthen the immune system.
Barley and oats contain beta-glucan, a type of fiber with antimicrobial and antioxidant capabilities that have been found to stimulate the immune system.
Selenium, found in fish, which is especially plentiful in shellfish such as oysters, lobsters, crabs and clams, helps white blood cells produce cytokines-proteins that help clear flu viruses out of the body.
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