Daniel Lieberman is an American evolutionary biologist at Harvard whose The Story of the Human Body explains why modern humans are chronically ill through the lens of evolutionary mismatch — diseases caused by living in environments our bodies were not designed for.
Daniel Lieberman is a professor of human evolutionary biology at Harvard who has spent his career studying how the human body evolved — particularly how bipedalism and endurance running shaped human anatomy. His research on barefoot running attracted significant popular attention and influenced the barefoot running movement of the 2010s.
The Story of the Human Body (2013) synthesizes this research into an accessible account of how the human body was shaped by millions of years of evolution for conditions that bear little resemblance to modern life. Lieberman’s central argument is that many of the chronic diseases that kill most people in developed countries — type 2 diabetes, heart disease, osteoporosis, certain cancers, chronic back pain — are evolutionary mismatches: the consequences of living in environments and with behaviors that our bodies were not adapted for. We evolved to run long distances, sleep on the ground, eat a varied diet, and experience regular physical hardship; the modern world has removed most of these stressors.
The book is both diagnosis and implicit prescription: understanding why our bodies react as they do to sedentary life, processed food, and modern sleep environments suggests interventions more effective than simple willpower. Lieberman writes with the enthusiasm of a scientist who finds his subject genuinely important and his prose is accessible without being condescending. Exercised (2020), his follow-up, applied similar thinking specifically to physical activity and its role in health.
