In this episode, Dr. Brandon & Dr. Morgentaler talk about studies reporting parental brain “shrinkage” and lower testosterone in new fathers, arguing these are likely effects of sleep deprivation and stress—not adaptive evolution—and usually rebound as life normalizes. 00:11 – The doctors introduce today’s topic, exploring how becoming a parent can literally change your brain and hormones. 00:41 – They break down the research showing brain volume shrinks in new parents, comparing fathers and mothers and what that might mean. 11:08 – A lively discussion about testosterone drops in dads, why it’s probably sleep deprivation, and why calling it “evolutionary” is a stretch. 17:52 – They share honest stories about those hazy newborn months, feeling “brain-dead,” and how things eventually go back to normal. 19:52 – Wrapping up, they reassure listeners that brains and hormones bounce back and encourage enjoying parenthood without fear. With Dr. Abraham Morgentaler and Dr. Marianne Brandon Listen to the podcast on all of your favorite platforms: Apple: https://podcasts.apple.com/ec/podcast/the-sex-doctors/id1761813985?l=en-GB Spotify: https://open.spotify.com/show/0apSFzquJXKoOGnmI6ndgT?si=e5a1e482c7ca46c7 Find us on: Instagram: https://www.instagram.com/thesexdoctors?utm_source=ig_web_button_share_sheet&igsh=ZDNlZDc0MzIxNw== Facebook: https://www.facebook.com/thesexdoctors YouTube: https://www.youtube.com/@thesexdoctorspod TikTok: https://www.tiktok.com/@thesexdoctor LinkedIn (Dr. Abraham): https://www.linkedin.com/in/abraham-morgentaler-md-81628b6 LinkedIn (Dr. Marianne): https://www.linkedin.com/in/mariannebrandon-59224513 X (Dr. Abraham): https://x.com/DrMorgentaler X (Dr. Marianne): https://x.com/drbrandon #NewParentBrainChanges #EvolutionaryAdaptationDebate #PostnatalHormonalShifts