A single ounce of Brazil nuts contains well above the daily value for selenium, a mineral that helps boost your immunity. In fact, the average Brazil nut contains about 70 micrograms of selenium, which is why we recommend this nut as a top choice. Having enough selenium in your body increases its production of cytokines, which help remove the flu virus. You can get your selenium through other means, such as seafood. Lobster, oysters, clams, crabs, tuna, and cod all contain selenium.

Read more: 5 Super-Healthy, Selenium-Rich Recipes

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