Dr. Robert Sapolsky: Science of Stress, Testosterone & Free Will | Huberman Lab Podcast #35

In this episode, I interview Dr. Robert Sapolsky, Ph.D., Professor of Biology, Neurology & Neurosurgery at Stanford University. We discuss stress, what defines short-term versus long-term stress, and how stress can be beneficial or detrimental, depending on the context. We also discuss stress mitigation and how our sense of control over stress mitigation techniques, including exercise, determine health outcomes. Dr. Sapolsky explains some of the key effects of the hormone testosterone — how it can amplify pre-existing tendencies for aggression or sexual behavior, but that it does not produce those behaviors per se. He also explains how testosterone impacts our social hierarchies, sense of confidence, and willingness to embrace challenges of different kinds. He also explains how our behaviors and perceptions shape testosterone levels. And we discuss estrogen and the powerful role it plays in brain development, health and longevity. Finally, we discuss free will, what it means to have free will, and if we have any free will, including how knowledge alone might allow us to make better decisions for ourselves and society. #HubermanLab #Testosterone #Stress Thank you to our sponsors: ROKA - - use code “huberman“ InsideTracker - Belcampo - Our Patreon page: Supplements from Thorne: Social: Instagram - Twitter - Facebook - Website - Join Newsletter - Links: Dr. Sapolsky’s most recent book, “Behave: The Biology of Humans At Our Best & Worst“: Support Research in the Huberman Lab at Stanford on Stress, Sleep & Human Performance: Timestamps: 00:00:00 Introduction: Dr. Robert Sapolsky 00:02:26 Sponsors: Roka, InsideTracker, Belcampo 00:06:30 Stress: Short & Long-Term, Good & Bad 00:09:11 Valence & Amygdala 00:11:00 Testosterone: Common Myths vs. Actual Truths 00:15:15 Behaviors that Affect Testosterone 00:17:20 Mindsets & Contexts that Affect Testosterone 00:20:28 How Finger Length Ratios Reflect Prenatal Hormone Levels 00:22:30 Aggression: Male-Female, Female-Male, & Female-Female 00:24:05 Testosterone: The Challenge Hypothesis 00:29:20 How Dopamine Impacts Testosterone & Motivation 00:32:32 Estrogen: Improves Brain & Longevity BUT TIMING IS KEY 00:39:40 Are Testosterone & Sperm Counts in Males Really Dropping? 00:42:15 Stress Mitigation & Our Sense of Control 00:51:35 How Best to Buffer Stress 00:57:04 Power of Perception, Choice & Individual Differences 01:00:32 Context-Setting, Prefrontal Cortex & Hierarchy 01:11:20 How Dr. Sapolsky Accomplishes Deep Thinking 01:13:17 Do We Have Free Will? 01:20:50 How to Apply Knowledge & Learning 01:23:44 Robert’s New Book: “Determined: The Science of Life Without Free Will” 01:28:27 Reflections, Support of Podcast, & Supporting Stress Research Please note that The Huberman Lab Podcast is distinct from Dr. Huberman’s teaching and research roles at Stanford University School of Medicine. The information provided in this show is not medical advice, nor should it be taken or applied as a replacement for medical advice. The Huberman Lab Podcast, its employees, guests and affiliates assume no liability for the application of the information discussed. Photo credit: Linda A. Cicero (used with permission from Stanford Medicine Media)