When we eat a meal, we have a reasonable expectation that the food will make us feel full. But we know from our experience that this expectation is not always fulfilled.
It depends on what we eat even more than on how much we eat.
Feeling hungry after a meal does seem to be counterintuitive. So much so that I didn’t believe it until I experienced what it was like not to feel hungry for many hours after eating.
I’m certainly not asking you to take what I write on faith. Only experience counts.