I think you can see what's in them on the side of the box - there's about 48 or so different ingredients, most of them chemical...softeners and dough conditioners, etc and etc.; maybe even trans fats. They were all the rage around here as well, but they've all closed down permanently...once you know what's in them and how they clog up your arteries, your taste for them vanishes quickly enough!
Anyhow, I think there is a Krispy Kreme calendar on the net somewhere with one girl for each month - each woman is between 300 and 500 pounds - quite the sight - I'll see if I can find the link if it's still around....