Weightwatchers and many other diets work because they make you apply the one characteristic you appear to have let slip - discipline. I'm the same most times - head in the fridge, mmm that looks good, just a quick bite then. But once I get into a diet regime and STICK TO IT the weight drops off. An exercise worth doing is trunk curls, or anything else that tightens up the stomach muscles, as this reduces the amount of space left for your stomach to expand into and so makes you feel full sooner.