I began keto the Monday after my surgery info session at the end of Feb. I have lost 65 lbs since then following the keto diet. My nutritionist didn't recommend it but she said as long as it was working I could do it. She wanted me to follow a high protein low fat diet. I stayed keto up until the start of my liquid diet, which was Monday 8/21. My surgery is 8/31. I questioned whether or not I wanted to have surgery since I was so successful with the keto diet... but I still have 100+ lbs to lose and I'm not getting any younger. I plan to stay low carb following surgery, eventually transitioning to keto if my body allows it. My labs have improved dramatically and I'm no longer pre-diabetic thanks to keto.