About this episode
1,700 Americans will die from cancer today. 70 every single hour. Professor Thomas Seyfried says it doesn't have to be this way, and that mainstream oncology has misunderstood cancer for 100 years. Thomas Seyfried, PhD, is a professor of biology at Boston College and one of the world's leading researchers on the metabolic origins of cancer. He is author of the book 'Cancer as a Metabolic Disease: On the Origin, Management, and Prevention of Cancer' and co-developer of the Glucose Ketone Index (GKI) and the “press-pulse” therapeutic strategy. He explains: ◼ Why he believes cancer is a mitochondrial metabolic disease, not a genetic one ◼ Why cancer cells feed on two fuels and the strategy his team uses to starve tumors ◼ How a ketogenic diet could lower your GKI and make chemo and immunotherapy work better ◼ The environmental drivers quietly damaging your mitochondria ◼ How his team is keeping glioblastoma patients alive for years, and why almost no patient is ever told this option exists The views expressed are those of the guest, and this conversation is intended for general informational purposes only. This podcast and its associated materials should not be used as a substitute for professional medical advice, diagnosis, or treatment. Chapters 00:00:00 Intro 00:02:22 The New Discovery About Cancer 00:03:23 What Role Do Mitochondria Play in Cancer? 00:07:52 ATP & Fermentation: How Your Cells Make Energy 00:14:40 The Oncogenic Paradox Finally Explained 00:19:59 Ghost Mitochondria: Cancer Under the Microscope 00:24:59 Glucose & Glutamine: The Fuels That Feed Cancer 00:26:12 Why Do Children & Babies Get Cancer? 00:29:05 Why Wealthy Countries Have More Cancer 00:32:35 Is Cancer Genetic? 00:37:38 The Prescription: The Glucose Ketone Index 00:40:03 How Stress & Poor Sleep Fuel Cancer 00:44:34 What's Inside the Confidential Envelope? 00:45:38 The Patient Who Inspired the Discovery 00:50:05 Measuring Your Glucose Ketone Index Live 00:52:41 The 'Red Zone' Link To Cancer 00:57:42 The Man Who Survived Glioblastoma for 10 Years 00:58:35 Using the Keto Diet to Supercharge Chemo 01:07:12 The Experiment That Could Prove Cancer Isn't Genetic 01:08:10 1,700 Cancer Deaths a Day: Seyfried's Warning 01:13:21 Seyfried's Plan to End the Cancer Epidemic 01:16:05 What Foods You Should Actually Eat 01:21:38 Fasting Protocols & Hitting 'The Wall' 01:26:28 Hyperbaric Oxygen Therapy & Cancer 01:28:10 Microplastics & 'Forever Chemicals' 01:30:27 How Cancer Spreads: Metastasis Explained 01:37:07 The #1 Actionable Takeaway 01:39:25 Energy, Hope & Final Words Independent Fact Check: https://stevenbartlett.com/wp-content/uploads/2026/07/DOAC-Dr.-Thomas-N.-Seyfried-Independent-Research-Further-Reading.pdf Thomas Seyfried's Metabolic Health Assessment: https://stevenbartlett.com/wp-content/uploads/2026/07/Proposed-glucose-ketone-index-GKI-zones.webp Thomas' latest research paper https://link.thediaryofaceo.com/7btDwc6 Follow Professor Thomas: ◼Instagram - https://link.thediaryofaceo.com/1MRuOwr ◼X - https://link.thediaryofaceo.com/DDF9xxr ◼Substack - https://link.thediaryofaceo.com/HKsGFcF ◼ Professor Seyfried's Biology Department - https://link.thediaryofaceo.com/HKwWhwD ◼ Foundation for Cancer Metabolic Therapies - https://link.thediaryofaceo.com/6Ehj3Hh ◼ Elizabeth Ann Weathers Breast Cancer Research Fund - https://link.thediaryofaceo.com/Bf10aHy A message from Professor Seyfried: “If you would like to support research on the mitochondrial metabolic theory of cancer, please consider donating to our research. Please remember that no donation amount is too small or too large.” The Diary Of A CEO: ◼ Join DOAC circle here - https://doaccircle.com/ ◼ Buy The Diary Of A CEO book here - https://smarturl.it/DOACbook ◼ The 1% Diary is back - limited time only: https://bit.ly/3YFbJbt ◼ The Diary Of A CEO Conversation Cards: https://linkly.link/2hm7r ◼ Get email updates - https://bit.ly/diary-of-a-ceo-yt ◼ Follow Steven - https://g2ul0.app.link/gnGqL4IsKKb Sponsors: Wispr - Get 14 days of Wispr Flow for free at https://wisprflow.ai/steven Eight Sleep - http://eightsleep.com/steven use code STEVEN for up to $350 off. 30-day at-home trial. Free returns. Ekster Link: https://link.thediaryofaceo.com/GSNEWnm
Episode summary
I open on sleep as the bedrock of performance and recovery, then point to a sealed envelope on the table and ask what’s inside.
It’s an embargoed paper laying out a low‑toxicity strategy to manage cancer far more effectively, grounded in decades of science and giving real hope to people who’ve felt hopeless.
You say your view on cancer and metabolic disease isn’t mainstream; help us understand it plainly.
Cancer begins with injured mitochondria, the cell’s energy network that also helps decide when cells divide, repair, or die; when these structures falter, everything from neighboring tissues to the nucleus is affected.
So when mitochondria get stressed or damaged, what actually happens inside the cell?
If oxidative energy production weakens, the cell falls back on ancient fermentation, pumping out lactic and succinic acid even when oxygen is present; acute hits can kill a cell fast, but chronic, low‑grade hits push cells toward dysregulated growth.
Name the hits that push us there, and explain why even kids can get cancer.
Chronic inflammation, intermittent hypoxia from poor sleep, processed carbs, inactivity, stress hormones, viruses, microplastics, and forever chemicals all chip away at mitochondria; fat‑soluble toxins can cross the placenta, so damage can begin before birth.
Why do wealthier countries see more cancer while some traditional societies see less?
Our biology was forged for scarcity and movement, but we now live with constant calories, refined sugars, poor sleep, and sitting; think wolves in the wild versus apartment‑bound dogs, and you see how lifestyle reshapes disease risk.
Give people a practical way to protect mitochondria, not just theory.
Use the glucose‑ketone index to gauge mitochondrial health by dividing blood glucose by ketones; lower ratios signal a Paleolithic‑like state where chronic disease is harder to spark.
Walk me through why ketosis helps, and where glucose and glutamine fit in.
Healthy cells burn ketones efficiently, but cancer cells can’t; to compensate for mitochondrial inefficiency, tumors guzzle glucose and the amino acid glutamine, so lowering glucose with ketosis weakens tumors while your normal cells get more resilient.
Does that alone stop cancer, and how does it work with standard treatments?
Ketosis starves tumors of glucose, but you still need to target glutamine with repurposed drugs; in this metabolic state, even low‑dose chemo, select immunotherapies, and hyperbaric oxygen can hit harder while healthy cells are better shielded.
Many oncologists push back on ketogenic diets, citing cachexia and a genetics‑first model of cancer.
They’re trained to see cancer as a mutation disease, but nucleus‑swap experiments and modern imaging show mitochondrial control; therapeutic fasting or ketosis causes intentional, protective weight loss, which is different from cancer‑driven wasting.
What everyday choices keep us in the prevention zone rather than the danger zone?
Prioritize real food, regular movement, good sleep, and stress reduction; avoid ultra‑processed carbs, reduce exposure to forever chemicals, and filter water because many contaminants erode oxidative phosphorylation over time.
Can people self‑monitor without becoming obsessive, and what about fasting?
Use finger‑prick checks or a brief CGM stint to learn how meals move your GKI, then track less; a short zero‑carb phase can make water‑only or fasting‑mimicking protocols more tolerable and may enhance therapy by lowering glucose and inflammatory byproducts.
What about spread, and what’s the takeaway for families facing a diagnosis right now?
Metastasis likely involves immune‑tumor hybrids that are heavily glutamine‑driven, which is why glucose restriction plus glutamine targeting can help; for patients today, learn the GKI framework, aim for the green zone, pair it with thoughtful, lower‑dose standards of care, and use imaging to steer the plan.
This approach isn’t easy, and it’s not one-size-fits-all. Work with a medical professional, especially if you’ve got other conditions, so the plan can be adjusted safely.
Some people don’t respond well to ketogenic dieting, and comorbidities can make it risky, so please consult your doctor.
Carnitine deficiencies can block ketone production, and targeted supplementation may help, but that needs a clinician’s eye.
Our closing tradition: what’s given you the most energy, and what’s been the biggest drain?
This work gives me energy—seeing biology made measurable and giving people a real chance when they were told there wasn’t one. It’s not about money; it’s about turning evidence into hope and hearing from people years later who are still living their lives.
If people want to support, where should they go?
Our research runs on private foundations listed in my papers, and donations are optional and appreciated when the approach has helped. We’re publishing steadily across journals, including work on breast cancer and our broader metabolic strategy.
I respect the science; speak to your clinician and use the best tools you can find.
Oncology still holds a lot of misunderstandings here, but other medical fields show how fast practice can evolve with good evidence.
Our last episode reached about fifteen million people, and the comments became a community for those looking for hope. If you’re listening now, please share support, rigorous resources, and what helped you—no one should feel alone after a diagnosis.
Thank you for amplifying this, because public awareness will drive change as more successful case reports emerge. We’re committed to this work, we’re teaching it at Boston College, and scientific literacy—and smart use of new tools—will help people navigate what comes next.