When humans lived in caves, they didn’t know anything about preserving and storing food. They spent all their waking time and energy hunting and gathering food. When they had it, they gobbled it down fast. Instead of storing food in pantries or cupboards, they stored energy in their bodies in the form of fat to burn during periods when there was little or nothing to eat. Each year, it was absolutely vital for them to put on a good layer of fat during the warm sprint and summer months. That was the only way they could guarantee their survival during the lean and mean winter months. And since women bore the young, they needed more energy to sustain themselves and their babies, and that meant they were usually heavier. Keep reading to find out more!