There is a motivational image somewhere about this very topic. It says something along the lines of giving up and binging because you had a treat is like saying "oh, I dropped my cell phone, might as well pick it up and keep throwing it on the ground until it smashes to bits". In other words, indulging a little isn't the same as totally falling off the wagon.
Maybe good for people to keep in mind, so they don't feel anxious about food.
In my case, though I'm not overweight, I do tend to completely consume junk when it's in front of me. So, sometimes I try to have a couple of bites of a treat, pause, and calm down a bit, as opposed to just eating until it's all gone. Typically, I'll end up giving the rest of the snack to somebody else, and not end up feeling sick.