The Doctor's Farmacy With Mark Hyman, M.d.

Friendship isn’t just a feel-good concept—it’s essential for your health, happiness, and longevity. In this episode of The Doctor’s Farmacy, I sit down with world-renowned author and leadership expert Simon Sinek to explore the science and psychology of friendship—why we need it, how it impacts our biology, and what it takes to build deep, meaningful relationships in an increasingly disconnected world. In this fascinating conversation, we discuss: The surprising link between friendship and physical health—how loneliness drives inflammation, chronic disease, and even early death. Why your five closest friends determine your habits, health, and overall well-being. The social contagion effect—how behaviors like diet, exercise, and even emotions spread through friend groups. Why food, fitness, and lifestyle interventions won’t work unless we also address social health. The biggest friendship mistakes people make—and how to fix them. The missing conversation in longevity research—why friendship might be t