In this episode, I sit down with Dr. David Klurfeld—longtime USDA scientist and one of the few insiders to publicly challenge the WHO's classification of red meat as a carcinogen. We go deep into the flawed evidence behind the infamous 2015 IARC report, why nutritional epidemiology often fails to prove causality, and how a small group of researchers helped shape global policy with low-quality science. If you've ever felt confused about meat, saturated fat, or dietary guidelines, this conversation will help you think critically about what “counts” as evidence—and who gets to decide.

We cover:

• Dr. Klurfeld’s personal journey and lessons from a career in public health
• Why the 2015 IARC red meat classification was based on weak and inconsistent evidence
• How observational studies and “allegiance bias” mislead nutrition science
• The politics of dietary guidelines and the role of the USDA and WHO
• What the media got wrong—and why red meat remains a nutrient-dense food

Whether you're a clinician, dietitian, or simply trying to make better nutrition decisions, this episode is a powerful reminder that bias, groupthink and weak data can distort science and mislead the public. We need to be discerning about the nutrition and health advice we follow.

Who is Dr. David Klurfeld?

Dr. David Klurfeld is a nutritional scientist and former National Program Leader for Human Nutrition at the USDA’s Agricultural Research Service. He also served as Professor and Chair of Nutrition and Food Science at Wayne State University and Associate Editor of The American Journal of Clinical Nutrition. He has authored more than 200 scientific publications and was one of 22 experts invited to the 2015 IARC working group on red meat and cancer. He is a longtime advocate for scientific integrity in public health policy.

This episode is brought to you by:

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Find Dr. David Klurfeld at:

• Indiana University Bloomington - https://publichealth.indiana.edu/about/directory/David-Klurfeld-dmklurfe.html
• Google Scholar - https://scholar.google.ca/citations?user=Ym5Og20AAAAJ&hl=en
• LinkedIn - https://www.linkedin.com/in/david-klurfeld-812845209/

Find me at:

• Instagram:@drgabriellelyon
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Dr. Larry Lipshultz. is one of the world's leading experts in men's reproductive health. In this week's episode, we discuss testosterone therapy, male fertility, and the hidden environmental factors threatening men’s health. Dr. Lipshultz shares groundbreaking insights into why male fertility is declining, common myths surrounding testosterone and prostate cancer, and innovative strategies to safely enhance men's reproductive and overall health.

We cover:

• The alarming 50% drop in male fertility since the 1980s—and what’s driving it
• Testosterone therapy myths: prostate cancer, fertility, and what’s actually true
• Practical treatments for restoring fertility while on testosterone therapy
• Anabolic agents: risks, benefits, and smart use
• Personalized, patient-centered care to optimize male reproductive and overall health

If you care about men's health, fertility, or hormone optimization, this conversation is a must-listen.

Who is Dr. Larry Lipshultz?

Dr. Lipshultz’s research focuses on male reproductive dysfunction, testosterone therapy, cardiovascular risk, and the genetics of infertility. He has pioneered innovations in testicular sperm extraction, vasectomy reversal, and testosterone optimization therapies. With over 460 peer-reviewed publications and as co-author of a foundational textbook on andrology, his contributions have significantly enhanced diagnostic approaches in male infertility. An early recipient of the American Urological Association Research Scholar award, he advocates for integrative andrologic health as a foundation for lifelong wellness.

This episode is brought to you by:

• Puori - Get 20% off sitewide with Code DRLYON - https://Puori.com/DRLYON
• Cozy Earth - Use code DRLYON for up to 40% off - https://cozyearth.com
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• Manukora - Get $25 off the Starter Kit - https://manukora.com/DRLYON

Find Dr. Lipshultz at:

• Website - https://www.larrylipshultz.com/
• Baylor College of Medicine - https://www.bcm.edu/people-search/larry-lipshultz-25437
• LinkedIn - https://www.linkedin.com/in/larry-lipshultz-md-93977344/

Find Me At:

• Instagram:@drgabriellelyon
• TikTok: @drgabriellelyon
• Facebook: facebook.com/doctorgabriellelyon
• YouTube: youtube.com/@DrGabrielleLyon
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• Apply to become a patient – https://drgabriellelyon.com/new-patient-inquiry/
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What if your biggest challenge isn’t motivation but missing structure? In this episode, I sit down with Brian Johnson to unpack the science and philosophy of lasting behavior change. We explore the power of ancient wisdom, stoicism, and the neuroscience of excellence, and why most wellness apps fail to deliver real transformation.

Brian shares his personal journey from startup success to creating a global movement around character, discipline, and identity-based habits. We talk about the science of anti-fragility, how muscle mirrors virtue, and why the gap between who you are and who you could be is the true source of suffering. Whether you're a high performer or someone who wants to stop breaking promises to yourself, this conversation will help you build the structure to show up as your best—no matter the circumstance.

What You’ll Learn:

• Why most behavior change fails—and what the science says works
• The philosophy of Areté: how to close the gap between potential and action
• How ancient stoicism aligns with modern recovery, resilience, and muscle
• Why building muscle is a metaphor (and mechanism) for building character
• The true definition of anti-fragility—and how to train it

If you're ready to bridge the gap between knowing and doing, this episode is the roadmap you've been looking for.

Who is Brian Johnson?

Brian Johnson has spent half of the last 25 years as a Founder/CEO and the other half as a Philosopher. As a Founder/CEO, he’s made crowdfunding history and built and sold two market-leading social platforms. As a Philosopher, he created Philosopher’s Notes, wrote the bestselling book Areté: Activate Your Heroic Potential, and developed a protocol integrating ancient wisdom, modern science, and practical tools that has been scientifically proven to help people change their lives. Brian is featured in the documentary Finding Joe on the modern Hero’s Journey and has trained some of the world’s most elite performers. He lives in the country outside of Austin with his wife and two kids and is all in on fulfilling Heroic’s mission to help create a more noble and virtuous world in which 51% of humanity is flourishing by 2051.

This episode is brought to you by:

• LMNT- Free Sample Pack with any purchase, visit https://DrinkLMNT.com/DRLYON
• AG1 - FREE bottle of AG D3K2, an AG1 Welcome Kit + 5 travel packs with your first order – https://drinkAG1.com/DRLYON
• OneSkin - Use Code DRLYON for 15% off OneSkin – https:// www.oneskin.co
• Timeline - 20% off your order of Mitopure visit https://timeline.com/LYON

Find Brian Johnson at:

• Learn more about Brian Johnson and Heroic and get some free content just for my listeners: heroic.us/drlyon
• Tiktok: https://www.tiktok.com/@heroicbrian
• Instagram: https://www.instagram.com/heroicbrian/
• Facebook: https://www.facebook.com/heroicbrian/
• Linkedin: https://www.linkedin.com/in/heroicbrian/
• YouTube: