Protein making me nauseous in PRE-Operation Weight Loss Surgery Q&A Posted April 27, 2019 · Edited April 27, 2019 by jg7979 Isopure Low or Zero Carb powders , Unjury chicken Soup Flavor, and Unflavored powder are my post surgery choices. Premier shakes were okay for me pre-surgery and I could chug them from the carton and not taste too much (a shaker bottle is great to avoid tasting them too much too). I felt like I was quitting smoking again with withdrawls from food/flavor variety by being limited to so few textures and flavors--the struggle is real, but part of the surgery process involves retraining your brain. After surgery I had to start using powders in skim milk or Water because the thickness of the premade shakes made me gag. I spent a week on nothing but chicken soup flavor because anything sweet made me nauseous (I had to buy different chewable vitamins too). Expect your tastes to change to bit as the process moves on. Trying mixing in unsweetened cocoa powder, Decaf coffee crystals, cinnamon,and peanut powder too. The clear drinks leave a pasty film in your mouth that is worse than the shakes to me.