And getting hungry from a tiny food when there isn’t more is against that. If I find a little food, I must fast as it’s more pleasant than eating it… (Okay, maybe in a survival situation I would rather suffer than not eating the precious morsel but in my current life, NO WAY. Even my SO who handles hours of hunger every day just fine, refuses to eat a meal if it’s small. Staying hungry feels much better than feeling totally starved.)
But both kind (being fine with a little food or not) makes some sense. But why we humans are so different? Most people are fine with eating little food. They eat a sandwich over fasting while the latter is way more pleasant and logical to me. If I eat, that is better a proper sized meal! But not everyone is like this. (What I always fail to understand and I wonder if it’s a movie/novel/fanfic thing or real for someone is when people eat an apple when hungry. It’s the last thing I would eat then as an apple has the power to make me starving when I am perfectly satiated and would be for several hours… At least it was years ago. And anyway, apple isn’t food, it’s a sugary drink with crunch or something. Nature’s non-satiating candy - though I understand satiation is extremely individual, there aren’t really any truly general rules about it. Maybe some people get satiated by an apple. I needed 1kg banana and it only lasted for an hour… And it was banana, a special, somewhat satiating fruit. Most fruits make me hungry, no matter what.)
This is an interesting topic 
I suppose our appetite and hunger and need for fuel are more or less influenced by the previous day(s) for most of us… It’s very weak for me and my SO basically have tabula rasa, apparently (though he doesn’t have extremely unusual days. like, fast day or 2 times the usual amount of food. there is still a significant variance but it doesn’t seem to do anything with the next day). If I massively overeat one day, I still desire a lot of food the next day, sadly 
If I fast, I do feel it 
Carbs have an impact, though, I am almost always super satiated after a carby day (not all day but until my normal first meal or a bit longer), it makes perfect sense to me. My cravings are smaller if I indulge before, that’s logical too.
But yours make perfect sense as well, we are just different.
By the way difference… Do people really desire different food in different seasons? Because I totally don’t. Or my SO. Or his Mom… My body wants exactly the same food all year around, I merely get tempted by fresh produce in summer, I don’t need it. And I surely need my more or less fatty pork in the hottest weather too. But I am a human, with a human body with its needs, don’t our body needs the same nutrients all year long? WHY is the “we want light food like salads in summer” come from then? And I saw it more than once that people claimed they barely eat more than some fruit in hot summer days… But don’t they get hungry, weak or something? I don’t function when I don’t get my nutrients and I doubt it’s very individual, it’s how our body should work… It needs the essential nutrients, maybe some can skip it for weeks (I theoretically could but I would hate it very much) but eventually (soon) we need to resume eating at least remotely properly I would think…
I am in my egg phase now. I could eat eggs when perfectly satiated… But I always could eat a lot without hunger. I need appetite for that, my satiation/hunger/need for fuel has little to do with it!
But making they simple egg dish - that’s nothing. I easily cook way more difficult things in a state where I am physically and mentally unable to eat! Cooking is a reward in itself, well not always or any kind. I prefer simpler things. Or fun things like bread making.
Of course hunger helps. But I can (and often very eager to) eat any of my staple food without hunger and I may not stomach of most of them when starving. So these kind of tests never worked for me. But I don’t need those, I am perfectly aware if I am hungry and if I desire something.
JUST READING that sentence caused a growl in my stomach and the thought of making eggs was like that anticipation I get when I’m about to start an art project. I’m all giddy, and for the flavor too. Lmaooo - guess I’m hungry!