I am powerless to Nutella. I can't walk past the jar, even if it's hidden away in the cupboard, without getting another spoonful...
I had half a jar in my cupboard once and had had a bad week, weight wise, and when I got back from my SW meeting, I was feeling low and I thought "sod it" I'll just eat some Nutella, I have a week to work it off. And had several spoonfuls of it. As I was getting near to the end, I didn't really want anymore, but I made myself eat it so I could feel sick of it and not crave it anymore. I haven't bought it since. Though I know the whole cycle would start again if I did!