> If it was that simple, why didn't the human body just evolve That's easy to answer. We exist today in a very different environment to that we evolved in. It

> If it was that simple, why didn't the human body just evolve That's easy to answer. We exist today in a very different environment to that we evolved in. It makes perfect sense that there could be a hormone that wouldn't provide a net reproductive benefit to hunter-gatherers or subsistence farmers but provides an immense health benefit to sedentary humans eating unlimited food. In fact, it would be surprising if there wasn't.