As our brains evolved, we lived in places where so much was limited to us. We had limited access to sugar, fat. Life was a constant struggle—kill or be killed. But nowadays you can text your dealer, you can shop to your heart’s content, eat as much sweet and fatty foods as you want. Pretty much any substance you want to engage in you can, and without limit. Our brains tightly regulate how much endorphins they produce. Endorphins don’t last very long in the brain. But when these substances or stimuli are available from the outside, there’s no regulation to keep things in moderation. Our brain
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