It’s not just kids, adults like unhealthy foods, too…we just hopefully show some discipline and keep our cravings in check. It goes back to when the human species was evolving, when food was far harder to acquire than it is now. The nutrients in fruits are of high value to our metabolism, so nature gave us a sweet tooth so we’d go out of our way to search out fruits. Fats are of even higher value, so nature made us love that flavor, too. If you’re not motivated to chase down a rabbit for dinner, you won’t get those nutrients and the energy they represent. So nature made us “like” the foods of high value, but which are hard to get.
Nowadays, the local minimart has as much sugar and fat as you want, for very reasonable prices. The cravings for sweet and fatty foods is pretty much obsolete, but we haven’t evolved out of them. Foods that cater to our innate sense of taste are trivially easy to get, and too much of them has become very much a bad thing.
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