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10 flu-fighting foods

By: Julie Knapp on Jan. 10, 2011, 7:11 a.m.
oysters on the half shell

Photo: avlxyz/Flickr

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Zinc is critical for the immune system — it rallies the troops, or white blood cells, to attack bacteria and viruses like flu or cold. One medium oyster provides nearly all of the zinc you need for a day, while a portion of six gives you over five times the recommended amount.