Absolutely no food. I'll allow drinks as long as they are in a bottle or cup with a lid, and being drank by an adult. Of course, I'm 25 & single with no kids, so it's not like kids are ever in my car. I've been like this since I bought my Saab a few years ago (sister totalled it, I bought a Camaro
)
Was a bit of a culture shock to friends & family because my other cars were pretty much open game. Of course, they weren't new either....