Has anyone found what protein shake they are going to use (pre- op and/or post)? I'm trying to make a spread sheet to compare brand's calories, protein, price, carbs, and finally sodium. My nutritionist said not to worry about carbs and sodium, but I'm a bit concerned about a very high sodium level. I need to do a two week pre op liquid and a two week post op liquid diet. Just want to see if people are starting to look around