Why we get sick

by Randolph M. Nesse

"We can cure hundreds of ailments, but we understand remarkably little about why diseases exist at all. Why do we crave the very things that make us sick? Why, after thousands of generations, hasn't natural selection eliminated cancer, schizophrenia, and other scourges and evolved us into perfect human beings?"--BOOK JACKET. "Such questions are at the heart of the new discipline called Darwinian medicine, which applies the principles of evolutionary biology to the problems of medicine. The result of a unique collaboration between the chief architects of this new science - a groundbreaking Darwinian physician and one of the pioneers of modern evolutionary theory - Why We Get Sick offers a whole new set of scientific questions and suggests new ways of understanding illness."--BOOK JACKET. "Finding evolutionary explanations for why we get sick - infectious agents that evolve faster than we do, environmental novelties, genes that are selected despite the fact that they cause disease, defen