I've taken a real liking to sugar snap peas, raw, straight from the bag. I'll eat an entire bag while watching a movie. Now that my taste buds have awakened from their salt-sugar-oil induced haze, I find vegetables taste much sweeter and with more range of taste than I used to notice. Peas (from frozen bag) is another good filler. Just peas, no salt or butter or anything. They're quite sweet. A green smoothie can also fill me up. I toss in as many greens (romaine, kale, spinach, celery, etc) as I can fit in my old VitaMix, along with a fruit or two. An orange is pretty filling, I think. If I can spare the calories, I munch on celery with peanut butter on it (plain old ground up peanuts, no extra salt or oil or sugar). Two tablespoons of peanut butter can fill six or seven celery stalks.
When all else fails, I have a pot of tea (usually decaf) with some soy milk in it. Soothing.