Be been doing good on my preop diet and I have 4 days till surgery my sister left out some McDonald's cause she bought to much and I ate it :/ I was feeling so hungry I'm ashamed I did it. But anyway I ate basically a kids meal does anyone think this will affect my surgery in 4 days? Anyone slip during preop diet?

Get back on track, and you are probably ok.

Many of us have made mistakes along the way. Different surgeons have different requirements, but from most posts it seems like as long as you get yourself back on track, you will be fine. If you're really worried about it you could always call and fess up, but they'll probably just tell you to stay strictly to the diet from now on =) My doctor didn't make me do a pre-op diet and everything went fine. Don't beat yourself up about it, just accept it and move on from here.