The human body needs protein for required brain and body functions. It also needs protein to balance the absorption of sugar into the bloodstream, and works beautifully in conjunction with the right amount of carbs and fats.
Protein powders are an excellent way to add protein to your diet. It's also a very convenient way. And in many cases protein powders provide the right ratios of carbs, fats and sugars that provide a healthy balance for sustained energy and satiety.