Why is pre-digested Protein made from Animal Collagen bad for post-op RNY?

Hi - I have a very hard time getting in enough protein post-op and have found a lot of success using Proteinex as a protein supplement. Protein shakes make me too full to eat, and the isopure stuff simply tastes aweful. I like the Proteinex (the pre-digested stuff that I'm taking) because I can literally do a shot in the AM and one at night and get 18g with each shot. I feel so much better after having drank it. Then, I read somewhere on this website that protein from collagen is #1 bad and #2 not digestible properly. I find this strange since it is what they put into feeding tubes when people cannot eat themselves, and because it is "predigested", it is supposed to support full absorption. I'm still relatively new (5 months out), but I've done great with the weight loss and this is really helping. Can anyone shine some light on this subject? Much appreciated!

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