Grey Zone Longevity

About Grey Zone Longevity

Are you fully healthy, or are your cells in the Grey Zone between health and disease? GZL explores the latest longevity science to uncover what we can do now to detect risk earlier, restore resilience, and move aging cells back towards optimal health. Hosted by pharma scientist Jon Brudvig, PhD, and longevity physician Grant Fraser, MD, the show features conversations with scientists, physicians, biotech founders, and leaders in prevention and aging biology. GZL examines the interventions, biomarkers, drugs, lifestyle strategies, and emerging ideas that help us extend healthspan and change how we think about healthy aging.

Publisher

Jon Brudvig and Grant Fraser

Category

health & fitness · science

Language

en

Explicit

Yes

First episode

1 May 2026

Latest episode

17 Aug 2026

Latest episodes

3 episodes in the feed.

1. 

   17 Aug 2026

   The Intake Assessment - The Foundation of Longevity Medicine

   Longevity medicine is full of exciting ideas: rapamycin, peptides, supplements, and emerging therapies. But before worrying about any of them, have you actually assessed the diseases most likely to kill or disable you? In this episode, Jon Brudvig, PhD and Dr. Grant Fraser walk through Dr. Fraser's approach to longevity-focused primary care: identifying disease early, measuring risk more directly, and addressing the fundamentals before moving on to more speculative interventions. From cardiovascular imaging and metabolic health to cancer screening, bone density, frailty, infections, hearing loss, and cognitive decline, this conversation lays out a practical framework for understanding where you stand today—and what may be worth doing about it. In this episode: • Why “normal” labs and conventional risk scores don’t necessarily mean you’re disease-free • Why Dr. Fraser puts cardiovascular and metabolic health at the top of the longevity hierarchy • The role of coronary CT angiography, brain and vascular MRI, and other advanced imaging • ApoB, lipoprotein(a), insulin sensitivity, blood pressure, omega-3 index, hsCRP, and other biomarkers • Whole-body MRI for cancer screening—and the real tradeoff between early detection and false positives • Why Grant uses low-dose lung CT even in some nonsmokers • DEXA scans for bone density, visceral fat, body composition, and sarcopenia • How infections and vaccination become increasingly important with age • Hearing loss, dental health, vascular disease, and other overlooked contributors to cognitive decline • Why diet, exercise, sleep, stress, and conventional prevention should come before the “clever” longevity interventions Follow the hosts: Jon Brudvig, PhD — Translation on Substack https://jonbrudvig.substack.com (https://jonbrudvig.substack.com) Grant Fraser, MD — Longevity & Precision Primary Care https://www.grantfrasermd.com (https://www.grantfrasermd.com)

2. 

   17 Jul 2026

   Immune Aging with Natalia Mitin, PhD

   Can You Measure Immune Aging? Natalia Mitin on Immune Resilience, Senescence, and Personalized Longevity In this episode, Jon Brudvig and Dr. Grant Fraser sit down with Dr. Natalia Mitin, co-founder and CEO of Sapere Bio, to explore one of longevity medicine’s biggest blind spots: how do we measure immune function and immune aging in an individual—and use that information to make better decisions? From immune resilience, T-cell exhaustion, and cellular senescence to thymic regeneration, fisetin, rapamycin, GLP-1 drugs, exercise, and gut health, this conversation examines what it will take to move beyond population averages and toward truly personalized longevity medicine. In this episode Why immune health is better understood as balanced or unbalanced—not simply strong or weak How immune resilience may relate to infection, chronic disease, healthspan, and longevity What happens to the thymus and T cells as we age The promise and unanswered questions surrounding TRIIM and thymic regeneration How SapereX measures immune resilience and cellular senescence What the evidence says about fisetin, rapamycin, GLP-1 drugs, exercise, and other interventions Why measuring first may be wiser than blindly expanding a longevity stack About Dr. Natalia Mitin Natalia Mitin, PhD, is the co-founder and CEO of Sapere Bio. Her work focuses on cellular senescence, immune aging, and biomarkers designed to evaluate immune resilience and monitor how it changes over time. SapereX Longevity testing (https://www.saperex.com/saperex-longevity) Sapere Bio (https://www.saperex.com/) Natalia Mitin on LinkedIn (https://www.linkedin.com/in/nataliamitin) Research discussed Immune resilience despite inflammatory stress promotes longevity and favorable health outcomes including resistance to infection (https://www.nature.com/articles/s41467-023-38238-6) Profiling an integrated network of cellular senescence and immune resilience measures in natural aging (https://pubmed.ncbi.nlm.nih.gov/37693401/) Thymic health consequences in adults (https://www.nature.com/articles/s41586-026-10242-y) Thymic health and immunotherapy outcomes in patients with cancer (https://www.nature.com/articles/s41586-026-10243-x) Reversal of epigenetic aging and immunosenescent trends in humans—the TRIIM trial (https://pmc.ncbi.nlm.nih.gov/articles/PMC6826138/) TRIIM-X clinical-trial registration (https://clinicaltrials.gov/study/NCT04375657) Fisetin is a senotherapeutic that extends health and lifespan (https://pmc.ncbi.nlm.nih.gov/articles/PMC6197652/) Follow the hosts Jon Brudvig, PhD — Translation on Substack (https://jonbrudvig.substack.com/) Grant Fraser, MD — Longevity and Precision Medicine (https://www.grantfrasermd.com/)

3. 

   1 May 2026

   Diet & Lifestyle Factors with Gary E. Fraser, MBChB, PhD

   Are the biggest longevity gains hiding in plain sight? In this episode, Jon Brudvig and Dr. Grant Fraser sit down with Dr. Gary Fraser, a pioneering epidemiologist behind the Adventist Health Studies, to explore what decades of human data reveal about diet, lifestyle, disease risk, and lifespan. From plant-based diets and nuts to exercise, body weight, dairy, fish, and processed foods, this conversation cuts through the noise to ask a simple question: what actually seems to help people live longer, healthier lives?

Reach and audience

Public platform figures. Ratings count people who left a rating, not total listeners.

Apple Podcasts (US)

5.0 / 5

4 ratings

Spotify

5.0 / 5

3 ratings

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Guest appearances

Books guests

Based on episode analysis; this does not confirm that the show is currently accepting guests.