3 More Types of Protein Powder. But there's a third reason why whey protein is recommended for people trying to lose weight: âIt's the most effective food you can eat to help you turn on a process called protein synthesis, which starts the building new muscle,â says Arciero.n layman's terms, extra protein will ensure that you hold on to the muscle you already haveâmuscle mass is often a casualty during weight-loss attemptsâand it will help you gain muscle more easily too.