Just One More Bite, Or A Situation That Would Bite?

I would choose an all you can eat buffet for my last meal. I figure as long as I keep eating, I stay alive.... right? Worse case scenario, once I am stuffed and feel really sick, I wouldn't have to deal with that feeling for long. However, if I wound up so sick that I started throwing up, would they delay the execution? Sure I'm toast anyway, but would they want to deal with a bigger mess?