7. Sweet Potatoes
Being rich in beta-carotene, sweet potatoes also play a key role in preventing common colds. When consumed, beta-carotene is converted into vitamin A, which is essential for maintaining a strong immune system and a well-functioning body.
Vitamin A also keeps the mucous membranes that line the nose and throat healthy and functioning properly. So if you do get a cold, symptoms will be mild and you will recover faster.
Eat one-half cup of boiled or roasted sweet potatoes on regular basis to improve your immune system and fight off common colds.
8. Brazil Nuts
These rich, creamy nuts are high in selenium, a mineral that improves the immune system and helps fight infections including common colds. Selenium also helps prevent cellular damage from free radicals by helping to form infection-fighting T-cells.
In addition, Brazil nuts contain minerals like zinc and iron as well as vitamin C that are essential for maintaining a strong immune system.
Just one or two Brazil nuts daily will provide your body with the required dose of selenium for preventing the common cold and flu.