If you’re in the mood to munch, but feel low on energy (which means you have no intention of going for a walk) consider logging onto the computer and playing a word game, or puzzle, or card game. There are a lot of free ones out there. If you’re on Facebook, you can find a lot of games (called applications). Sometimes you can even play with friends.
Try sipping some water while you play and see if that stops the craving. If not, hopefully, by the time you’re done playing, you’ll have to be on to another activity and you won’t have time to munch.