There are such wide variations in what folks consider filling; I'm really interested in reading the answers to this thread because it's fascinating to me that we're all so different physiologically.
For me, getting full on volume alone is impossible. A salad that would fill a small bathtub wouldn't assuage my hunger. I know because I've tested it, and even the biggest pile of "rabbit food" leaves me miserably full--yet still hungry at the same time. But for other people, that volume trick really works, so if you're one of those people, eat huge amounts of veggies and you'll thrive.
I used to see only one "Full-O-Meter," but now I realize I have two: actual physical fullness is one, but the "Satiety-O-Meter" is just as important for me. In order to get sated as well as full, I have to eat at least two and preferably all three types of foods together--fat, protein, and carbohydrate. (I have to watch the "fat + carb" combos, though, because some of those taste too good to stop eating.
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I do find that some volume is necessary, though, so along with the at-least-two-food-types guideline, I also try to live up to a suggestion I read here: NO meal is complete without a fruit or vegetable, not even snacks. I don't always manage it, but most of the time I do find that topping all my wraps and sandwiches with vegetables or eating an orange with my breakfast eggs and toast makes me feel fuller longer. I also credit this new habit with feeling better in general; I think it's the first time in my adult life that I'm being truly well-nourished.
Some of my most satisfying meals include red beans and rice (I go light on the rice), vegetable-laden soups, vegetable pizzas, chili and a turkey wrap on the side, egg "McMuffins" with tomato instead of meat, omelets (with--yep, you guessed it--plenty of vegetables inside), mini fruit-and-cheese plates as snacks, hummus and vegetables to dip into it, black bean tacos and burritos, pulled pork with various vegetable sides, and popcorn.
What doesn't fill me up: any cereal that doesn't have plenty of protein and fiber (too much of one food type to stick to my ribs well), oatmeal by itself (ditto), a cup of yogurt (too little volume), salad as a meal unless they're loaded with nuts and chicken for protein, liquid calories from shakes or smoothies (I start full, but feel hollow quickly after finishing), most pre-packaged "diet" or "snack" bars (candy bars with a few vitamins sprinkled in--I'd rather eat a Snickers for the same caloreis), and non-fat cheese (tastes far too bad to use as food).