What is Health?: Allostasis and the Evolution of Human Design

Homo sapiens emerged as a species about 200,000 years ago and soon--with fire, simple tools, and an egalitarian social system--we inhabited every continent. But now our infinitely elaborated tools and our highly non-egalitarian social system threaten sustainability. Many at the bottom lose the desire to live, committing suicide or succumbing to drugs, alcohol, and obesity. As women gain education and contraception, they lose the desire to reproduce, and our species' total fertility plummets...