When I went in for my surgery the girl in the hospital bed next to me had changed clothes into her gown and laid down for her pre-op routine. She had put on 5lbs since she had seen the doctor last and swore up and down she lost weight on her liquid diet. The doctor sent her home and said "we will reschedule your surgery for when you want to take this more seriously."
I guess what I'm saying is don't go overboard. I'm two months post op (70lbs lost) and I've dabbled with things like ice cream, Taco Bell, chick fil a, whataburger, alcohol, etc. You must realize your relationship with food moving forward is not a "never again" type scenario but is most certainly a "in extreme moderation" one.