This thick and tangy yogurt-like beverage contains a wide variety of probiotic bacteria and 11g of protein per cup. Kefir is made by adding kefir grains to milk, which causes fermentation to occur. Have a cup of kefir as an on-the-go breakfast, or add to your cereal instead of milk. Look for kefir in the dairy or natural-foods section of your grocery store; it's available in plain and fruit flavors.
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