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10 flu-fighting foods

yogurt with fruit and granola

Photo: SanFranAnnie/Flickr

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Yogurt

The digestive tract is one of your biggest immune organs, so keep disease-causing germs out with probiotics and prebiotics, found in naturally fermented foods like yogurt. One serving a day labeled with “live and active cultures” will enhance immune function according to a study from the University of Vienna in Austria.