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The Mayo Clinic reports that yogurt is surprisingly good for you. One 8-ounce cup of plain low-fat yogurt provides around 400 mg of calcium, more than the 300 mg in an 8-ounce glass of milk. Yogurt also has as much potassium as a banana and as much protein as an egg or ounce of meat. To make yogurt, warm milk is fermented with two types of beneficial bacteria.
Yogurt is also more digestible than milk for peple who are lactose intolerant. And the The live bacteria in yogurt aid in digestion. But don't rule out apples—eating an apple a day can protect you from breast cancer!
Some yogurt makers heat the yogurt after it's cultured to increase the shelf life, but that kills the bacteria. Look for the official National Yogurt Association's seal on the container that says "Live and Active Cultures."