answer:Protein shakes are meant to supplement your normal diet, they aren’t intended to replace real food all together. I’ve used them when I’m trying to eat several small meals as something that’s portable and convenient when you don’t have time or facilities for a better alternative. There are different mixes, using different types of protein, and intended for different purposes. Most are marketed as either meal replacement shakes, weight gainers, or diet shakes. So there’s no one answer to which is right. The best way to find one that works for you is to try small samples of several and see which you like the taste of. Usually places that sell them have either single serving packets of the powder or ready to drink single servings so you can figure out what works for you. Please don’t try to live off of them, they aren’t designed or meant to provide everything your body needs, especially if you’re exercising regularly.