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Yogurt

Why it's super: Yogurt contains probiotics, which are bacteria that live in the intestine, aid in digestion, boost the immune system, diminish bad breath, and are even associated with longer life spans. A 1-cup serving also supplies one-third of your daily calcium requirement, as well as 14 grams of satisfying protein.

How to enjoy it: Opt for low-fat or nonfat versions to minimize saturated fat, and try substituting plain yogurt for a healthier alternative to sour cream. Lactose intolerant? Look for soy or rice milk varieties.