I cheated a few times on the Pre-Surgery diet. Once I had a really low BG reading and so I had a party size butterfinger (the best candy bar I've ever had in my life). I also snuck some chicken in on mother's day and a small plate of food a few days later. It's not recommended but it's also not the end of the world. Just try to do the right thing most of the time and the liver is probably going to be small enough to do the procedure. That being said, I was warned that a patient of my doctor's really liked cream of chicken soup. So much so, that when it came time to do her procedure her liver was too big and they had to stop her procedure. Like I said, I tried to do the right thing for the most part and I was able to get my sleeve. Just keep your eye on the prize!