Homeslice. Watch that video that Sean posted:
http://www.youtube.com/watch?v=dBnniua6-oM
(Yes, it's long as hell, boring at times, but it's the final word on ALL of this, with all of the science checked backwards, and forwards to back it up)
It's not the fat, the cheese, the salt, or the flour...it's the fructose. It metabolizes very much like alcohol (ethanol), exclusively in the liver. It does not tell the brain it was fed (bypasses leptin), actually MAKING you hungry and is...in a word; TOXIC.
I also defy you to find more than 3 breads in your supermarket that DON'T have HFCS added. It's in nearly everything, and unless you become a fucking food freak, you'd be hard pressed to avoid this shit entirely.