Protein is an essential macronutrient that helps build muscle, repair tissue, and make enzymes and hormones. Using protein powder may also aid weight loss and help people tone their muscles. There are many different types of protein powder, including dairy-based and plant-based powders. Protein is an important nutrient for weight loss. Getting enough can boost your metabolism, reduce your appetite and help you lose body fat without losing muscle.Protein shakes are an easy way to add more protein to your diet, and have been shown to help with weight loss.