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Birth of a Parent

Birth of a Parent

Ep. 3 - The Dad Bod Theory (with Lee Gettler)

Jul 22, 2026 · 44m

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Why would evolution redesign a man's body after he has children? Anthropologist Lee Gettler helped uncover a surprising answer. His research on hormone changes including testosterone suggests that fatherhood doesn't just change how men think and feel, it changes their biology too. Shownotes: Lee’s landmark study Longitudinal Evidence that Fatherhood Decreases Testosterone in Human Males showed that men's testosterone levels decline after becoming fathers, helping reshape our understanding of paternal biology. The Cebu Longitudinal Health and Nutrition Survey ( CLHNS ) is one of the world's longest-running birth cohort studies, following thousands of families in the Philippines. Many of…