Nonfat plain Greek yogurt is one of the most diet-friendly foods you can eat. Greek yogurt has twice as much satisfying protein and half the sugar of regular yogurt. One study reported that when dieters upped their protein by 15%, they ate up to 441 less calories per day. Another study found that dieters who included 24 ounces of fat free yogurt daily shed 81% more belly fat. Try your hand at creating your own toppings for Greek yogurt or try the recipe below.