Because at the end of the day we are still mentally and biologically wilderness animals that can never be assured of our next meal. If you can find calorically dense food (fat, sugar, etc…) then you go for it. Your brain will reward you for making this “good” decision that will assuredly keep you alive, and drive you to do it again next time you get the chance. The problem is that our genetics never foresaw a world in which we would ever have nearly limitless opportunities to eat absurd amounts of calories at will, every day, for decades. This has caused some issues, certainly.
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