Because the food we eat is over-processed and engineered to make us crave it. It also has way more nutrients and calories than the food we used to eat.
Combined with lower amounts of physical labour, our bodies hormonal systems get disordered and we lose the ability to regulate our food intake properly.
Contrary to what others are saying, there were many human societies that did not have a lack of food.
For example, prior to WW2, the Netherlands had not had a famine for centuries.
Multiple generations of humans grew up with more than enough food.
The nutritional value was lower, which is why people nowadays are taller and fatter than back then.
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