Unfortunately, the promise of change—like the promise of reward and the promise of relief—rarely delivers what we’re expecting. Unrealistic optimism may make us feel good in the moment, but it sets us up to feel much worse later on. The decision to change is the ultimate in instant gratification—you get all the good feelings before anything’s been done. But the challenge of actually making a change can be a rude awakening, and the initial rewards are rarely as transformative as our most hopeful fantasies (“I lost five pounds, and I still have a crappy job!”).