I used to work at a donut shop- we'd get free donuts all the time, but after working with them for like 9 hrs, you don't really want any right away. However, later in the day I would partake.
I also used to do an early AM Sunday morning radio show (like 4-6am) and would run to Dunkin donuts afterward and get a dozen and pretty much live off them all day long. It always felt like I did some damage to my insides by eating nothing but donuts and milk all day, but I was a student and didn't really have the money (nor cared enough) to eat right. I don't do this any more, even though every once in a while I get the urge to. First half of college, i was still eating crappy, and it wasn't until the second half that i actually got into halfdecent shape.