My question: Why did natural selection leave us so vulnerable to disease?
My fields: Evolutionary medicine and evolutionary psychiatry

Research Professor of Life Sciences, and Founding Director (2014-2019), The Center for Evolution and Medicine, Arizona State University; Professor Emeritus, Departments of Psychiatry and Psychology, and Institute for Social Research, The University of Michigan; Founding President: The International Society for Evolution, Medicine, and Public Health
Core Principles for Evolutionary Medicine, 2019

How to frame and test an evolutionary hypothesis about a disease. Two page version
Diseases do not have direct evolutionary explanations, but traits that make a species vulnerable to disease need evolutionary explanation, and several may be needed.

Tacit Creationism: A current focus

Good Reasons for Bad Feelings:

Insights from the Frontier of Evolutionary Psychiatry

Buy on Amazon Full Book Information Here

• The Economist "Books of the Year"

• This book will surely change the face of medicine -- and deservedly so. —Robin Dunbar

• This is a wise, accessible, highly readable exploration of an issue that goes to the heart of human existence. —Robert Sapolsky

• A bold book that would have made Darwin proud. Cutting-edge and compassionate at the same time —Lee Dugatkin

• It is no exaggeration to say that he opens the door to a new paradigm in thinking about human beings and their conflicted lives. —Michael Ruse

• A provocative book full of intriguing explanations about human nature in all its strengths and weaknesses. —Carl Zimmer

• Someday nearly all psychiatry will be identified as evolutionary psychiatry. If so, Randolph Nesse’s book should be seen as the field’s founding document. — David Barash in The Wall Street Journal