How to stop my hunger pangs?

For the past two over years, it's been the same habit. Munching something,be it chips, pickled fruits, buns, muffins, bread, occassionally the healthy fruits, you name it, at hours which is supposed to be sinful for eating. Of course, it shows on my waistline but who cares when I still look reasonably 'ok' for someone my age. I could have looked better and more attractive though. But, with my kind of lifestyle, it's rather tough to always look radiant and cheery. Once in a blue moon, I don't munch but that is if blue moon appears more often. Nothing is impossible! I do believe this. It just takes determination which I lack unless...