Reading time: 5 minutes
What I Discuss:
Daniel Baird — Endocrine Disruptors, Microplastics & the Birth of NADS
- How a fractured C4 vertebra at 21 set Dan on a path through chronic inflammation, hormonal imbalance, and functional medicine, leading to a low testosterone diagnosis at 23…08:17
- Why endocrine-disrupting chemicals (EDCs) in everyday items like food storage, cosmetics, cookware, and especially your clothing may be sabotaging testosterone production…10:19
- Why polyester may be the last thing you want against your skin, given that scrotal skin has the highest absorption rate in the body…11:39
- How NADS filled a gap in the market: organic, non-toxic underwear that holds up to athletic training…13:13
- Why studies point to a growing reproductive health crisis in men, driven by microplastics in penile and testicular tissue…15:30
Katy Bowman — The Case Against the Chair
- Why not all sitting is equal, and how small changes like ditching the backrest can turn sitting into a more metabolically active position…17:01
- The “Kama Sutra of seated positions“: how dozens of other cultures rest in ways that double as passive stretching, and why Katy redesigned her home to discourage default chair use…18:20
- Eyes, sleep, and the static position problem: why varying your gaze and sleep positions may matter as much as your time in the gym…25:10
- Why ground sleeping forces your body out of the flexed, cushioned positions it holds all day, and how she spent 18 months transitioning her neck away from a pillow…26:25
Justin Roethlingshoefer — Owning Your Health Data Before It's Too Late
- From a hockey scholarship to NHL performance coach: how one sentence from Justin's father sparked an obsession with consistency and health data…30:45
- Why he has studied HRV for decades, and how he uses the metric to drive training, recovery, and supplementation decisions…31:26
- How he discovered precancerous polyps in his colon, and an ulcer the size of a quarter at age 32, and how it became his calling to advocate for gaining control of your health…33:50
- The difference between performing well and being well, and why high-functioning leaders are often the worst at monitoring their bodies and how they feel…37:00
- How a near-death diagnosis redirected Justin to start sharing his message to the public at large…39:17
Dr. Cate Shanahan — How Vegetable Oils Damage Your Cells from the Inside Out
- What 4-HNE actually is: a highly toxic alpha-beta unsaturated aldehyde produced when vegetable oils are heated, and why a single fast food fry may carry the oxidative load of an entire cigarette…40:44
- Why plant antioxidants don't protect you from vegetable oil damage: they're designed for plant biology, not human cells, and your liver and kidneys simply eliminate them…42:11
- Why you can't always trust a study that shows a supplement “helps” without asking what it was compared to, and why adding spirulina to a diet of processed junk tells you nothing about spirulina itself…43:20
- What Whole Foods isn't telling you about “cold-pressed” canola oil: why the term doesn't mean what it does in olive oil, and why their organic version is still refined like the conventional product…45:47
- Hormetic oxidative stress (exercise, sauna, and wine) vs. the irreversible cell membrane damage from processed vegetable oils, and why Dr. Shanahan sees the distinction as more nuanced than “good stress vs. bad stress”…47:12
- Why exercise is healthy for reasons far beyond oxidative stress (muscle growth, blood vessel generation, and hormone release)…50:36
Julie Gibson Clark — Biohacking on a Budget
- From childhood swim meets with her astronaut father to a brutal stretch of stress, acid reflux, breast lumps, heavy metal toxicity, and a near-abduction, and how it all led Julie to functional medicine…53:44
- The naturopath who ended her acid reflux by cutting wheat and dairy, and how this one change became the gateway to decades of health research…56:05
- What 15 rounds of chelation therapy felt like and why the fog lifting on week six changed everything…57:25
- From the Autoimmune Protocol (AIP) to a fasting-mimicking diet and David Sinclair's senolytics: how Julie self-educated her way to holding second place at the Rejuvenation Olympics for over a year…1:01:29
- NOVOS, fisetin, glycine, and the supplement stack that's driven her impressive biological age scores, and why consistent, compound effort beats any single intervention…1:02:58
James Pieratt — What the Spartans Can Teach You About Training
- Why the Spartans were the only culture in history fully devoted to war and physical perfection as a civilizational project, and what an 80-year stretch of Olympic pankration dominance reveals about their training…1:04:11
- The haltere: a stone hand weight used for weighted plyometrics, and why the Spartans were doing loaded jumps centuries ago…1:08:24
- The hoplitodromos: a 200 to 400 meter foot race in full armor with a shield, and the theory that it was engineered to train Greek soldiers to sprint through arrow fire at the Battle of Marathon…1:09:26
- Why the “300 Spartan Workout” is not historically accurate, and what an honest reconstruction of Spartan training would actually demand of a modern athlete…1:12:03
In this special “Best Of” episode, you'll explore some of my most impactful conversations on what grows long-term “roots” of health. If you're dealing with low energy, hormonal issues, chronic inflammation, or just a nagging sense that something's off despite doing all the right things, this episode gives you a clear roadmap.
You'll hear from Daniel Baird on how the synthetic fabric in your underwear may be disrupting your hormones and why microplastics are becoming one of the biggest threats to male reproductive health, while Katy Bowman from Nutritious Movement makes the case that your chair, your mattress, and your home environment are doing more damage than you think.
Additionally, Justin Roethlingshoefer shares how a serious diagnosis at 32 (after years of optimizing elite athletes while ignoring his own health) completely rewired his approach, and why tracking your health data is the foundation most high performers are still missing.
Dr. Cate Shanahan breaks down exactly how the oils in your kitchen are being incorporated into your cell membranes and why that matters far more than most people realize, and Julie Gibson Clark shows how she rebuilt her health from scratch in her 40s using sustainable habits that anyone can follow.
Finally, James Pieratt closes things out with a deep dive into what Spartan warriors actually trained like, and why their model of total physical preparation, built around weighted plyometrics, armoured sprinting, and no-rules combat, still holds up as one of the most complete blueprints for human performance ever devised.
Whether you listen start to finish or jump straight to the section that speaks to you most, you'll discover something in here that changes the way you think about the base layers of your health.
Episode Sponsors:
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Episode Resources:
People
Podcasts
- Toxic Underwear ALERT! What Your Underwear Is Doing To Your Balls (& Bloodstream) & How To Protect Yourself, With Daniel Baird
- Why You Should Try Sleeping On The Floor, The “Furniture-Free” Home, Building A Better Butt, Smartphone Solutions & More With Katy Bowman
- How To Listen To Your Body Better, The Best Way To Use HRV Data, Spartan DEKA FIT Training, The Power Of Ownership & More With Justin Roethlingshoefer
- DARK Calories! How Vegetable Oils Destroy Your Health (& How You Can Get It Back) With Dr. Cate Shanahan
- The 55-Year-Old Mom Who Spends Just $106 Per Month On The Gym & Supplements Is Reversing Her Age Faster Than Biohackers & Tech Billionaires: Julie Gibson Clark
- Ancient Spartan Training Secrets, The Most Biologically Badass US Presidents, Who Was *Really* The Greatest Athlete Of All Time & More, With James Pieratt
Products
- NADS Underwear (use code BENGREENFIELD for 15%)
- NOVOS
- Back Belt
- Fisetin
- Glycine
Books
- Move Your DNA by Katy Bowman
- Dark Calories by Dr. Cate Shanahan
- The Power of Ownership by Justin Roethlingshoefer
- Preparing for War by James Pieratt
Studies & Resources
- Detection of microplastics in the human penis
- 53 Ways to Take A Seat
- Valter Longo’s Fasting Mimicking Diet
Do you have questions, thoughts or feedback for me? Leave your comments below and I will reply!