ladyj779 said:
There's also this: people spend basically their entire lives being told by "the experts" that 2000 calories per day is the average they should eat. So when they're told they need to eat less than that just to "be healthy" or simply to avoid being fat, it comes across as both unfair and unreasonable.
Yet much of what passed for nutrition and food science across the past hundred years or so is largely nonsense, and it was shaped in no small part by economic forces — agriculture, fuel, war, and so on.
On top of that, plenty of that guidance assumed a population that, on average, did far, far, far more physical labor than most people do now. And today's food differs enormously from anything before it in human history, in what it's made of and in how easily we can get it.
Setting aside all these modern shifts, there's another plain fact: with age, even the strongest among us lose muscle, metabolism gets slower, and all of that adds up to needing fewer calories. Be it at 45 or at 70, time eventually catches everyone.
I know I'm rambling, but lately I've also been turning over this thought: watching most civilizations worldwide grow heavier and heavier across three or four decades, I genuinely believe that those of us — the majority — are probably the metabolically normal humans. We're driven to eat constantly, and our bodies store fat efficiently. That would have made us the ones who flourished when food was briefly abundant, and therefore survived the scarce stretches — which, across year after year and age after age, was most of human history. Meanwhile, the people who "forget to eat" are the ones who, most of the time, fared worst — which also explains why there are fewer of them.
In the west, food is so wildly abundant that we subsidized much of the developing world for fifty years, and the result is lots and lots of fat people, even in very poor areas. I think that's how humans evolved — keep hunting for food, eat it the moment you find it, since you never know when famine will strike.
Blah blah blah, sorry for the essay