"Greek yogurt is a great portable protein and it can also help you quell hunger," says Katherine Brooking, MS, RD. "What's more, Greek yogurt may also help fight belly fat, according to a recent study presented at the annual Society for Endocrinology conference. Researchers found that when protein is digested and broken down, one of the resulting amino acids, phenylalanine, triggers hormones that help reduce appetite, which can lead to weight loss."