7. Brazil Nuts
A single ounce of Brazil nuts contains well above your recommended daily value for selenium, a mineral that helps boost your immunity. Having enough selenium in your body increases its production of cytokines, which help remove the flu virus, says James A. Duke, PhD, the author of The Green Pharmacy Guide to Healing Foods.
Other primo sources of selenium include lobster, oysters, clams, crabs, and tuna.
8. Red Wine
The resveratrol and polyphenols in red wine work the same way that beneficial bacteria in yogurt do, says Duke: When cold and flu viruses enter you system, they start to multiply, and these compounds prevent that from happening.