In the years when I was a pretty serious (non-pro) ballet dancer, I managed to stay on a very low calorie diet for months on end by always allowing a single Hershey bar at the end of every day. If I DIDN'T do that, I learned early on, it was like holding my breath---I would diet for, say, two weeks, and then have a MAJOR binge day. It was much more manageable to diet for a long time once I'd learned to build in a treat every day.