Superfoods That Fight Colds

Trying to avoid colds and flu? From oysters to sweet potatoes, these foods can help.
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Yogurt and kefir

We usually think of bacteria as a bad thing, but some of these microorganisms are essential for good health. Eating probiotic foods, such as yogurt and kefir, is a good way to replenish beneficial strains of bacteria, which promote digestive health and help prevent stomach ailments. "There are over 10 trillion bacteria living in our gastrointestinal tract, so you want to make sure the good ones outnumber the bad ones," Ansel says.

The benefits of good bacteria may go beyond our gut. A 2011 review of the research found that consuming probiotics—whether in food or supplement form—lowers the risk of upper respiratory tract infections better than a placebo.

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