Protein shakes do not make dieters shed excess pounds, despite the claims of some protein powder manufacturers that their products cause weight loss, according to Mayo Clinic. However, consuming protein shakes may aid in weight loss if they are used for meal replacements, creating a calorie deficit.
There are many different types of protein shakes to choose between. Whey protein, which is easily digested and contains approximately 130 calories and 25 grams of protein per serving, is an option for those who are lactose intolerant. Egg, soy and plant-based protein shakes may also be desirable to those who are allergic to, or choose not to consume, milk products. Casein, the protein found in milk, digests slowly. This protein is found in milk protein powders and some blended protein powders as well.
Consuming protein shakes in addition to one's regular diet instead of using them as meal replacements may lead to excess calorie intake, resulting in weight gain. Those wishing to lose weight should opt for meal replacement protein shakes.
Meal replacement protein powders are intended to be ingested in larger quantities than regular protein powders, and these formulations generally contain a blend of both whey and casein powders and have 250-300 calories per serving. Meal replacement protein powders also contain added carbohydrates, fiber and vitamins.