I went 23 hours once without eating something, and I was so scared I'd end up anorexic, despite wanting to eat all day (I was craving barbeque at one point, even though I hate it xD)

Then the next day, I wasn't hungry, so that was more freakout :O

I remember reading on some website years ago about some people that will go on juice fasts for like a month; it was some crazy stuff yo.