here's something i've noticed: if i scramble or just fry three eggs in coconut oil or butter, they fill me up much less than if i eat three hard boiled eggs without the added fat. there's something about hard boiled eggs that's uniquely filling, at least as far as eggs go.
but is there a larger meaning here in terms of satiety? are we more filled by 'firmer' foods, rather than looser foods? could this concept be of aid to people looking to feel fuller, or get in tune with their appetite?
Sounds like food reward to me. Make something taste better and you'll want to eat more of it. For example, take steak, how fast do you think you'd get full eating very well done steak compared to medium rare (or however you like it, I like it rare).