6 Fat-Fighting Superfoods

Smoothies

Sipping a smoothie can stoke your fat-burning fires, as long as it contains whey protein powder. New research suggests that this substance triggers satiety hormones, including cholecystokinin, which sends your brain a "Hey, I'm full" signal. Plus, whey, a protein found in milk, contains the muscle-building amino acid leucine. "When you're losing weight, eating whey protein can help reduce the loss of lean muscle mass, which keeps your metabolism revved," Dr. Gerbstadt says.

Whey protein powder isn't just for smoothies. Mix it into yogurt and pudding or add it to the dry ingredients when you're baking muffins or cookies.