It's natural to graze when it's cold. You grab a handful of salted peanuts here, a chocolate brownie there, some buttery popcorn over there -- pretty soon you've unknowingly added 1,500 calories to your diet. The act of grazing isn't the problem; it's what you're grazing on. Pumpkin and sunflower seeds are great options.
Sunflower seeds are rich in potassium, Vitamin E and fiber. You can roast them yourself or buy them (ideally without salt) at your local health food store. Add some pumpkin seeds for snacking variety. Some research has even indicated that pumpkin seeds are helpful in relieving anxiety and lessening depression that can be associated with cold weather months [source: e-swastya].