875 episodes
The Scientist Who Scans Fathers' Brains: Parenthood Shrinks Your Brain, And Drops Testosterone 25%!
2026/08/24 | 1h 28 mins.What actually happens to your brain, and how fast or slow do you age when you become a parent? Dr. Darby Saxbe reveals the surprising science of the "parental brain" and how fatherhood physically reshapes a man's mind, why dads lose grey matter, what really happens to testosterone, and why the "dad bod" might be nature's design.
Dr. Darby Saxbe is a professor of psychology and a leading researcher on the neuroscience of parenthood. She is the founder and director of the NEST (Neuroendocrinology of Social Ties) Lab at the University of Southern California, where her pioneering work studies how the transition to parenthood changes the brains, hormones and relationships of both mothers and fathers. Her research has reshaped how scientists understand fatherhood, men's mental health, and what it really takes to raise a child.
Chapters
00:00:00 Intro
00:02:13 Role Of Fathers In Parenting
00:06:10 What Happens To The Brain When You Become A Father?
00:09:09 Why Testosterone Drops When Men Become Fathers
00:11:22 Should Men Be Worried About Lower Testosterone?
00:15:39 What Fatherhood Can Change In A Man’s Personality
00:19:00 The Upsides And Downsides Of Parenting
00:21:30 What Happens When We Make Parents Fight?
00:23:48 Why The Birth Experience Can Shape Your Relationship
00:27:25 Are People Waiting For The Perfect Time To Have Kids?
00:30:44 Why Fewer People May Be Choosing Parenthood
00:35:12 Ads
00:37:34 Do Parents Actually Have Healthier Brains?
00:45:02 What Does Daycare Really Mean For Children?
00:47:17 Why Mothers Become The Default Parent
00:49:10 Maternal Gatekeeping And Weaponized Incompetence
00:52:04 What Really Happens To Relationships After A Baby
00:54:27 Why Fathers Can Experience Postpartum Depression
00:56:45 Can Your Personality Predict Whether You’ll Divorce?
01:00:51 Why Women’s Ovulation May Be Harder To Detect
01:03:06 How Can You Increase Your Chances Of Conceiving?
01:04:03 What Every New Father Needs To Know
01:04:51 Ads
01:05:51 How Should Parents Divide Baby Care?
01:07:54 What Couples Should Do Before Having Kids
01:13:26 How To Protect Your Relationship After Having Children
01:15:24 Is The Dad Bod More Attractive?
01:18:36 What Does Your Childhood Teach You About Parenting?
01:20:30 How Divorce Can Affect Children
01:20:47 Are Humans Really Meant To Be Monogamous?
01:22:09 What Are The Biggest Concerns About Modern Parenthood?
01:23:54 What Systemic Change Could Transform Parenting?
She explains:
◼ Why a father's brain physically shrinks when you become a dad
◼ Why testosterone drops in new fathers
◼ Why the "dad bod" may signal a more attentive hands-on father
◼ Why men experience postpartum depression
◼ Why raising a child was never meant to be done by two people alone
Follow Dr. Darby Saxbe:
X: https://x.com/darbysaxbe
NEST Lab: https://www.nestlab.ca
Her research: https://dornsife.usc.edu/nestlab/
Her book ‘Dad Brain: The New Science of Fatherhood and How It Shapes Men's Lives: https://a.co/d/03Qhspxt
Join her US based ‘Daddy Stroller Social Club’: https://daddystrollersocialclub.com
The Diary Of A CEO:
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2026/08/21 | 30 mins.What if getting better sleep has less to do with sleeping longer, and more to do with your daily habits?
Dr. Kristen Holmes is a performance scientist whose work focuses on sleep, recovery, circadian rhythms and the everyday behaviours that influence how well our bodies and minds perform.
In this moment, Dr. Kristen Holmes opens up about her childhood and the catalyst to her passion for health and human potential. She reveals the overlooked habits that can quietly disrupt recovery and answers common questions about sleep disruption. Is one glass of wine really going to impact my sleep? What about caffeine? If I don't have time for 9 hours of sleep every night, can my sleep still be restorative?
Order Dr Kristen Holmes’ new book, Aligned, here: https://linkly.link/2qdKk
Listen to the full episode here!
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Watch the Episodes On YouTube: https://www.youtube.com/c/%20TheDiaryOfACEO/videosKonstantin Kisin & The Financial Crash Expert: Our Leaders Have Lost Control, It's TOO LATE To Stop!
2026/08/20 | 1h 33 mins.Is the West collapsing, or is the planet? Political commentator Konstantin Kisin and rebel economist Steve Keen go head-to-head on the biggest questions facing the West: immigration, the debt crisis, climate change, Trump, China and the future of AI.
Konstantin Kisin is a satirist, social commentator and author, best known as the co-host of the Triggernometry podcast and the author of ‘An Immigrant’s Love Letter to the West’. Born in the Soviet Union and now based in Britain, he has become one of the most prominent voices on free speech, culture and the rise of populism.
Steve Keen is an economist, author and one of the most vocal critics of mainstream economic thinking. A former Professor of Economics, he is the author of several books including ‘Debunking Economics’ and ‘The New Economics: A Manifesto’, and is currently writing his upcoming book ‘How Economists Will Destroy Capitalism’. He is known for his work on private debt, financial crises and the failures of conventional economic models, and for correctly warning of the 2008 financial crash.
They debate:
◼ Why almost everything governments tell you about debt and borrowing could be wrong
◼ Whether a socialist government could actually be good for the economy
◼ Why AI could quietly strip away human free will
◼ Why Konstantin believes mass immigration is pushing the West toward civil unrest
◼ Why Steve thinks climate change, not politics, is the real threat that dwarfs everything else
Chapters
00:00:00 Intro
00:02:05 We're on the Road to Civil Unrest
00:08:04 Where This Leads: Unrest and Violence
00:11:11 I Grew Up in the Soviet Union
00:12:12 Steve Keen: Capitalism Is About to Fail
00:20:49 "We're Not Spending Enough"
00:23:58 Should Britain Drill in the North Sea?
00:28:39 "You Can't Defend Yourself Against This"
00:32:48 The World Government Admission
00:36:55 "Brace for Impact" - Climate Change Is Here
00:40:03 "It's Too Late" - What Breakdown Looks Like
00:45:11 The Trap Trump Walked Into
00:48:49 The Famine He Says Is Coming
00:50:53 How Does Trump Get Out of This?
00:53:35 Does America Need a Socialist President?
00:55:37 Why China Works and the Soviet Union Didn't
01:01:10 "Would You Prefer the Chinese System?" — "Yes"
01:05:09 Will Andy Burnham Change Britain's Trajectory?
01:11:00 Wokeism: A Hierarchy of Oppression
01:13:30 AI, Mass Unemployment and The Hunger Games
01:17:21 Best Case a Pet, Worst Case a Cow
01:20:54 Can You Program Love Into an AI?
01:26:07 Nobody Can Stop It So How Do You Live?
Follow Konstantin:
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You can purchase ‘An Immigrant’s Love Letter to the West’, here: https://link.thediaryofaceo.com/97WXGH2
Follow Steve Keen:
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You can purchase 'Debunking Economics', here: https://link.thediaryofaceo.com/CaG0mQJ
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2026/08/17 | 2h 11 mins.Professor Brian Greene reveals the biggest questions science still can’t answer, whether we’re living in a simulation, why AI may deserve human rights, and what happens at the end of the universe!
Professor Brian Greene is a theoretical physicist, mathematician, and Professor of Physics and Mathematics at Columbia University, where he also directs the Center for Theoretical Physics. He is a leading researcher in string theory, the co-founder of the World Science Festival, and the bestselling author of several books, including ‘Until the End of Time: Mind, Matter, and Our Search for Meaning in an Evolving Universe’.
He explains:
◼ Why most physicists believe time travel into the future is already possible
◼ Why he believes humans don't actually have free will
◼ How string theory could reveal what everything in the universe is really made of
◼ Why the "Pale Blue Dot" changes how you see your own life and problems
◼ Why the search for meaning may matter more than finding the answer itself
Chapters
00:00:00 Intro
00:02:22 The Big Question Science Is Trying to Answer
00:03:49 How String Theory Could Explain Our Universe
00:04:44 How Could We Ever Prove String Theory Is Real?
00:06:17 What Makes the Strings in String Theory Vibrate?
00:07:52 Can String Theory Explain Why We’re Here?
00:09:16 What If We’re Living in a Simulation?
00:11:23 How Can Physics Explain Human Emotions?
00:17:23 Could Humans One Day Manufacture Emotions?
00:18:53 Would Knowing We’re in a Simulation Change Anything?
00:20:24 Could Humans and AI Eventually Merge?
00:20:59 Could Humans Ever Achieve Immortality?
00:24:57 How Knowing We’ll Die Shapes Every Decision We Make
00:26:59 Why Are We Here? The Optimistic and Pessimistic Answers
00:30:24 How Did Gods and Religions First Emerge?
00:33:33 What’s the Most Compelling Case for a God?
00:36:41 How Can We Comprehend Billions of Years?
00:40:12 Does Our Place in the Universe Make Us Insignificant?
00:42:48 How Big Is the Observable Universe, Really?
00:46:59 What Exists Beyond the Observable Universe?
00:47:56 Why Are Humans So Obsessed With Aliens?
00:51:45 Ads
00:54:26 What Is the Meaning of Life?
00:56:26 Is Free Will Actually Real?
01:00:41 What If Consciousness Is the Foundation of Reality?
01:08:05 Are Animals Conscious Like We Are?
01:10:11 What If the Universe Isn’t Infinite?
01:12:12 Could Aliens Have Already Visited Earth?
01:13:03 Could Humans Ever Travel Across the Universe?
01:15:53 How Time Travel Could Actually Be Possible
01:18:55 Who Was the Smartest Person Who Ever Lived?
01:21:26 Could AI Become the Next Einstein or Newton?
01:24:37 Ads
01:28:20 How AI Could Accelerate Science—and Even Tackle Mortality
01:29:48 Could AI Evolve Faster Than Humans Ever Could?
01:32:47 Could AI Become an Existential Threat to Humanity?
01:40:51 Can AI Ever See the World the Way Humans Do?
01:45:01 What Happens to Humanity in an Age of Abundance?
01:47:39 Could AI Ever Become Truly Conscious?
01:50:29 Why Go Vegan? The Case for Rethinking What We Eat
01:53:56 What Happens at the End of Time?
01:56:38 What Could Matter More Than What You Value Most?
Follow Professor Brian:
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World Science Festival - https://link.thediaryofaceo.com/4ltduUF
You can purchase Brian’s book, ‘Until the End of Time: Mind, Matter, and Our Search for Meaning in an Evolving Universe’, here: https://link.thediaryofaceo.com/GQngff0
The Diary Of A CEO:
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2026/08/14 | 25 mins.What if fear isn’t something you need to overcome?
Alex Honnold is the legendary professional rock climber behind Free Solo, best known for becoming the first person to free solo Yosemite’s 3,000-foot El Capitan without ropes or safety equipment.
In this moment, Alex explains why he still feels fear, and how decades of repeatedly confronting it have changed the way he responds to it. He reveals how to make seemingly impossible challenges feel manageable, and shares a provocative perspective on modern life and what it means to feel free.
Listen to the full episode here!
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About The Diary Of A CEO with Steven Bartlett
Steven Bartlett is a British entrepreneur, investor, and author. He’s the founder of Flight Story – a media company – and Flight Fund, an investment fund backing the next generation of category-defining businesses.
He created The Diary Of A CEO to share the unfiltered pages of the personal diaries of the world’s most fascinating CEOs, experts, therapists, and leaders – with the hope that their lessons will help both you and him live better lives.
DOAC is a double acronym: Diary Of A CEO, but also Dreamers, Open-minded, Awareness, and Connection. This is your corner of the internet to dream boldly, think openly, expand your awareness, and feel more connected.
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