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My theory is that "naturally thin" people do not love food like heavy people do. I have two obese friends and two thin friends at my gym. The two obese (and me!) talk about recipes, restaurants, what we are dying for; while the thin ones talk about their families, exercising, the news, the weather.
I know a serious foodie (the guy is OBSESSED with food, he loves to make it and he loves to eat it), who eats (according to my estimates when we worked together and I was staying at his house, therefore seeing everything he eats) about 3400-4000 cals/day, and is super skinny. There are people with ridiculous metabolisms, and they may love food just as much as heavier people. His partner goes on WW, makes 4 serving recipes...and this guy eats 3/4 servings while his partner eats one. And he still maintains his weight.
I know other thin people who don't eat all day, run around like crazy, forget about food, and then eat what seems like a lot at night, but that really equates to 1600-2000 calories worth of food for the day.
I know other thin people who do the stopping when full, but eat throughout the day. They just have a strong "off" button when full.
There are as many kinds of "thin people" as there are "fat people". They have in common that they eat a number of calories appropriate to what their metabolism burns. They vary widely in how they eat those calories, their relationship to food, the speed at which that metabolism burns and therefore how many calories they can actually eat. Just as heavier people have many reasons and ways for becoming fat (some ate more healthy foods, some have genuinely slower metabolic rates ie with PCOS or thyroid disorders, some get stuck in binge/starve cycles, etc), thinner people have many reasons and ways that they maintain normal weights.
Which is why debates like this make me crazy. There is no one "naturally thin" archetype, and to me it's just as offensive as assuming that every fat person got fat by watching too much TV and eating Twinkies.