Fat is an extremely dense supply of calories. We evolved to find calorie sources like fats and sugars delicious because resources were scarce for 99.9% of our evolutionary history, meaning plenty of our ancestors died from starvation while virtually nobody ever had enough food to become obese. The surplus of calories we enjoy in today’s modern world is a very new development, and evolution works far too slowly for us to have lost our calorie-craving instincts.
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