Someone at your gym swears protein powder melts fat. Someone else calls it expensive milk. Neither is right. Protein powder won't burn fat on its own, but it can make a calorie deficit far easier to stick to. Here's how. How It Helps It keeps you full. Protein is the most filling macronutrient. A shake between meals can stop the 5 pm snack raid before it starts. It protects muscle. When you...