At Metabolic, the reason that they recommend the protein drinks, is because they are SELLING them. They are a business, and they are automatically going to recommend products that will make them money. (Just like the woman at the Clinique makeup counter is going to recommend other products to you, when you are just coming in to buy a lipstick.)
It isn't the protein DRINKS that are so important...it is the daily amount of protein in your diet in general. If you are exercising and want to keep or build your lean muscle mass, your body needs protein to feed that muscle-just like your car needs fuel.
However, you don't have to have it in drink form. Meat, fish, eggs, soy...all of these things are wonderful protein sources. The drinks are fine if you don't get enough protein in your diet, but they are not necessary.
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