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10 flu-fighting foods

By: Julie Knapp on Jan. 10, 2011, 7:11 a.m.
sweet potatoes

Photo: Gallant/Flickr

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Sweet potato

Beta-carotene improves your body’s defenses. It’s instrumental in the growth and development of immune system cells and helps neutralize harmful toxins. Sweet potatoes and other orange foods like carrots, squash, pumpkin, egg yolks and cantaloupe are top sources.