I've been tossing around the idea in my head of having a cheat day once a week, especially after a co-worker who's lost a good amount of weight suggested it. Not because I want the "bad" food and feel deprived, but because I've heard a few places that if you're really strict with dieting you're body adapts and you're weight loss slows down. I started out doing 2000 cals a day and that worked for about a month and then I stalled so I dropped to about 1500 a day and that's still working fine, but if a cheat day would help to keep my body from adapting then I would do it.