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10 flu-fighting foods

Jan. 10, 2011, 7:11 a.m.
wild-caught salmon

Photo: Marxfoods.com/Flickr

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Wild-caught salmon

In a recent study, participants with the lowest levels of vitamin D were about 40 percent more likely to report a recent respiratory infection than those with higher levels of vitamin D. Increase your intake with salmon. A 3.5-ounce serving provides 360 IU, and some experts recommend as much as 800 to 1000 IU each day.