Protein supplements cause weight regain?

Does anyone know of a specific study about supplemental protein use after WLS? I have been reading the comments and especially Barb D and Michelle C. as long time post-ops recommend the supplements. My Dr. recommends Carnation instant and then food. But I am afraid on not getting in enough protein. A specific study would be helpful. I don't see how using supplements can make you regain the weight? Thanks,

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