We inherit all habits of our evolutional ancestors. And starvation was a way more common reason of death than obesity.
Animals in the natural conditions don’t get a chance to eat much too often so they try to accumulate as much calories as possible. This is why high-calorie food tastes good for us. Fats and sugar are tasty because our senses were trained to consume more. There was literally no reason not to evereat till the very recent times.
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