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10 flu-fighting foods

By: Julie Knapp on Jan. 10, 2011, 7:11 a.m.
A cup of hot tea in a clear glass

Photo: voraphong/Shutterstock

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Tea

Researchers at Harvard University found that drinking five cups of black tea a day quadrupled the body’s immune defense system after two weeks, probably because of theanine. Tea also contains catechins, including ECGC, which act like a cleanup crew against free radicals. Grotto suggests drinking one to three cups of black, green or white tea every day.