Just being aware of what you are about to do greatly diminishes the tendency to do what you don't want to. You will pull your hand back from that pizza slice, tell the waitress that you are passing on dessert, put on your gym shoes instead of going under the comforter, and take several deep breaths instead of screaming at your daughter
I just loved being in the gym. It was tough at times. Sometimes I wanted to quit, but I'm glad I stuck with it