Stupid Question
I am not an expert but I believe it's because when you lose so much weight quickly, you also lose muscle. Protein helps you maintain or build muscle. And of course, muscle helps burn fat so you always want to try and keep all the muscle you can. If you don't keep up the protein, you will be exhausted. And I think protein drinks are an easy way to get the amount you need without upsetting your tummy with a lot of meat, eggs, etc.
Protein = Muscle = Good Things
Protein = Muscle = Good Things
It probably depends on your doctor's diet plan also. I am on clear liquids for the 1st 2 weeks after surgery. Its kind of hard to get protein from clear liquids, lol. But i think once i start eating real food they don't want me drinking protein drinks anymore. I am sure just as long as you are getting the recommended protein they don't care how you get it :o)