I had surgery on August 1st. I didn't have to attend lifestyle classes and never needed a food log but if you aren't losing weight as they think you should they will require one. Liz, the case manager, has a difficult personality but I found once I made her my "friend" she was much nicer and if she likes you everything will go better. Honestly, I just told myself to do what I had to do get my surgery, after you have your surgery they can't take it away.