As I read different post I read of all the different kinds of pre op diets required. Some are all liquid , some have none at all, some like mine just require low carb high protein and no sugar as seen below, don't know why?

Different bariatric centers, different surgeons and most importantly different patient circumstances.

Stick to your surgeon's plan and you won't get barked at by them. Go in there and tell them that you deviated to something you saw on the internet........and you'll see their blood pressure rise.