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Kefir, or fermented milk, helps create healthy gut microbes in your body, which make up a large part of your body’s defense system. "In fact, your digestive system is 80 percent of your immune system," says Shemek, so the consumption of kefir not only improves immune-cell function but builds a fortress in your intestinal tract against bugs.

Looking for a delicious way to use kefir? Use it as a leavening agent in this Homemade Pizza Dough recipe by substituting the water and yeast with kefir.

(Credit: Thinkstock/Hemera)
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