Nothing. If you love chocolate - the sweet type, above 60-70% it gets too bitter to be really satisfying, even if it's still good and healthier - as much as I do you will always miss it, even if you manage to stop eating it or limit it to a level where it doesn't make you gain weight (I've fortunately managed the latter most of my life).
In the summer when it's hot ice cream - chocolate ice cream - can be a good, equally unhealthy substitute.
In the summer when it's hot ice cream - chocolate ice cream - can be a good, equally unhealthy substitute.