I recently came across this very interesting "New Yorker" article about the differences between individuals who are able to delay their gratification (essentially those who have self-control) and those who aren't. There are big differences and it interesting to see how something like self-control, which is a learned behavior, can impact so many facets of our lives and how well we do or to what extent we succeed (whatever your definition of success is). It basically comes down to the ability to distract yourself from whatever is trying to get your attention (junk food, alcohol, or any other vice you "can't" say no too).
I know that one of the big changes I had to make in my life was to finally get a grip on my self-control. I had to learn not to give in every time I wanted to eat something that was bad for me; to train myself to not go for the cookie and instead have something healthy. To not give in to emotional eating, and to recognize that was the reason I was consuming and not actual hunger. It is funny to me that when I look back I had so much self-control in some facets of my life and yet when it came to food I was at a complete loss. I cannot say for sure that I would've been like one of the children in the study who licked the filling out of the Oreo and then put it back on the plate before the researcher came back in the room, but something tells me that I probably would have been.
Anyway, check out the aritcle HERE. It's a worthwhile read.