Modern humans over-eat sugar because we love it so much.  One might ask, “why are we designed by evolution to love sugar when sugar is so bad for us?” How does the concept of the “environment of evolutionary adaptation” (EEA) help us explain this and some otherwise puzzling behaviors of modern humans? Please explain EEA first.

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Evolutionary adaptations

Evolutionary adaptation is the process through which organisms adapt or adjust to their surroundings to increase the chances of survival, mating, and reproduction. An organism's behavior, physiology, and structure are adjusted or changed to make it more suited to its environment.