Some say it's because the body wants its alcohol sugar and sweets are a good substitute. I craved dark chocolate a lot in the early months. I let myself have it and didn't gain any weight from it.
I considered it was more important for me to stay sober and the chocolate was just one way to stay sober.
I still like dark chocolate but don't have it nearly as much anymore, certainly not to extremes.
One popular remedy for cravings is to eat ice cream.
It really does kill the craving for alcohol. At least, it did for me.