I pig out on party foods every now and then. Sometimes it's worth it. Sometimes I'm disappointed. Sometimes I wake up 2lbs lighter, sometimes 2 lbs heavier. It's never been more than a blip in my weight loss trajectory. I don't sweat it. Knowing which foods are good for me and which are not so good for me doesn't mean I'm forbidden to ever again make a bad choice. Over time you will probably feel less and less inclined to make bad choices. That seems to be pretty typical.
CW-125, part calorie counting, part transition to primal
GW- Goals are no longer weight-related