I am post-op 3 weeks after RNY gastric bypass. First 2 weeks I lost total of 13 lbs, this 3rd week I only lost 1 pound. I am ONLY on Protein drinks, I did increase the standard requirement of 60-80 grams protein to about 90 grams. Does anyone know if the extra protein caused this OR any other ideas what I am doing wrong? (Premier Protein 30 grams x 160 calories each totals 90 grams protein and 480 calories)