BusinessWeek interview with Krispy Kreme CEO Scott Livengood

Q: How many doughnuts do you eat a week?

A: It'll vary week by week. I don't eat one every day, but I may eat three in a day, which I did yesterday. My advice is to eat everything in good measure. If you eat a doughnut or two a day, you've probably earned it.
Taking diet advice from a doughnut company CEO sounds like a good idea to me.