In the same vein, humans don't eat calories, like we don't eat vitamins, minerals, protein, etc: we eat food. Even today when there is more popular knowledge (t

In the same vein, humans don't eat calories, like we don't eat vitamins, minerals, protein, etc: we eat food. Even today when there is more popular knowledge (though to be fair, mainly confusion) about the nutrient content of food, most people will gravitate to what they are used to eating culturally, and what tastes good. Which, incidentally, is how we end up eating a lot of stuff that's really not good for us at all.