The Ezra Klein Show

Robert Sapolsky is a Stanford neuroscientist and primatologist. He’s the author of a slew of important books on human biology and behavior, including most recently Behave: The Biology of Humans at Our Best and Worst. But it’s an older book he wrote that forms the basis for this conversation. In Why Zebras Don’t Get Ulcers, Sapolsky works through how a stress response that evolved for fast, fight-or-flight situations on the savannah continuously wears on our bodies and brains in modern life. But stress isn’t just an individual phenomenon. It’s also a social force, applied brutally and unequally across our society. “If you want to see an example of chronic stress, study poverty,” Sapolsky says. I often say on the show that politics and policy need to begin with a realistic model of human nature. This is a show about that level of the policy conversation: It’s about how poverty and stress exist in a doom loop together, each amplifying the other’s effects on the brain and body, deepening their harms. And this is