What if one of the most basic ideas in nutrition — that a calorie is a calorie — is the wrong way to think about metabolic health?

For decades, Robert Lustig has argued that obesity, diabetes and other chronic metabolic diseases cannot be understood through energy balance alone. His central argument: what happens to food after we eat it matters, and added sugar — particularly fructose — can disrupt metabolic function in ways calorie counting fails to capture.

In this episode of Return on Health, hosts Niko Hems and Miguel Medina challenge Robert on how strong that case actually is. They discuss his research on sugar restriction, controlled feeding trials that appear to contradict some of his conclusions, food-industry influence on nutrition science, ultra-processed food, agricultural subsidies and the incentives shaping what we eat.

The conversation also turns to Ozempic, Wegovy and other GLP-1 drugs.

━━━━👤 ABOUT THE GUEST━━━━━

Robert H. Lustig, MD, MSL is a pediatric endocrinologist and Professor Emeritus of Pediatrics at UCSF.

He spent decades researching childhood obesity, diabetes and metabolic disease. His 2009 lecture “Sugar: The Bitter Truth” has been watched more than 25 million times on YouTube and made him one of the most prominent and debated voices in nutrition.

He is also the author of Metabolical, Fat Chance, and The Hacking of the American Mind.

━━━━🎙️ ABOUT THE HOSTS━━━━

Niko Hems is Head of Strategy & Medical Communications at YEARS, a preventive medicine company using longitudinal and multi-modal health data to make prevention more personalized and data-driven.

Miguel Medina is co-host of Return on Health, a podcast built around a simple idea: a system produces the outcomes it is incentivized to produce — so better health outcomes require better incentives.

━━━━⏱ CHAPTERS━━━━━

00:00 Who Is Robert Lustig?
00:52 What Is Metabolic Disease?
04:02 Mitochondrial Dysfunction Explained
09:11 What Does Metabolism Actually Mean?
10:45 Is “A Calorie Is A Calorie” Wrong?
15:35 Why Robert Thinks Fructose Damages Mitochondria
17:08 What Happened When His Team Removed Added Sugar?
22:49 Niko Challenges Robert On Contradictory Fructose Studies
29:23 Does Food Industry Funding Distort Nutrition Research?
33:10 How The Food Industry Shapes Science
35:20 The Center To End Corporate Harm
38:23 How Do We Fix The Food System?
41:18 What Can Ordinary People Actually Do?
44:50 Microplastics, PFAS & Other Metabolic Exposures
48:02 Can We Feed 10 Billion People Without Ultra-Processed Food?
51:47 The Most Underrated Metabolic Biomarker
52:45 Why Robert Refuses To Share His Personal Diet
53:14 What Foods Should People Eat More — And Less — Of?
54:46 What Robert Lustig Changed His Mind About
56:59 What Would He Change About US Food Policy?
58:09 How Food Subsidies Shape What We Eat
01:01:50 Robert Lustig On Ozempic, Wegovy & GLP-1 Drugs
01:04:35 The Potential Downsides Of GLP-1s
01:08:30 Why Robert Says We Still Have To Fix The Food
01:09:35 What Should Change About Healthcare?

━━━━━💡 KEY QUESTIONS ANSWERED━━━━━

• Is “a calorie is a calorie” biologically misleading?
• Why does Robert consider fructose different from glucose?
• What happened when his team restricted sugar without reducing calories?
• Why do some controlled feeding trials reach different conclusions?
• Does food-industry funding distort nutrition research?
• How much does ultra-processed food contribute to metabolic disease?
• Is fasting insulin an underrated biomarker?
• How do food subsidies influence what we eat?
• Are Ozempic and Wegovy solving obesity or treating the symptom?
• What concerns does Robert have about widespread GLP-1 use?
• Why does he think healthcare should spend far more on prevention?

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Connect with Robert:

Website: https://robertlustig.com/
LinkedIn: https://www.linkedin.com/in/robert-lustig-8904245/
UCSF: https://profiles.ucsf.edu/robert.lustig

What if aging is less like an inevitable biological process.. and more like damage that can eventually be repaired?

For more than two decades, Aubrey de Grey has argued that aging should be treated as a medical problem driven by the accumulation of molecular and cellular damage. His most famous idea, longevity escape velocity.

In this episode of Return on Health, hosts Niko and Miguel challenge Aubrey on how realistic that vision actually is, what his latest mouse rejuvenation experiments can tell us about humans, why his first major study fell short of its ultimate goal, and what would have to happen before rejuvenation becomes real medicine.

Aubrey also explains why he believes aging can be approached through repair, why combining interventions may matter more than testing them one by one, why current biological age clocks are still limited, what he thinks the Hallmarks of Aging get wrong, and why he believes the first person to live to 1,000 years has probably already been born.

━━━━👤 ABOUT THE GUEST━━━━━

Aubrey de Grey is a biomedical gerontologist and one of the most prominent voices in longevity science. He is the founder and President of the Longevity Escape Velocity Foundation, where his work focuses on developing and testing combinations of rejuvenation therapies aimed at repairing different forms of age-related damage.

He is also known for developing the SENS framework and popularizing the concept of longevity escape velocity: the idea that sufficiently effective rejuvenation therapies could extend healthy life long enough for progressively better therapies to arrive.

━━━━🎙️ ABOUT THE HOSTS━━━━

Niko Hems is a longevity expert and Head of Growth at YEARS, a company building a longitudinal, multi-modal health dataset to make prevention personal and data-driven.

Miguel Medina is co-host of Return on Health, a podcast built on a simple idea: a system always produces the outcomes it's incentivized to produce.

━━━━⏱ CHAPTERS━━━━━

00:00 Is Aging Actually A Disease?

02:17 Aubrey's Latest Mouse Rejuvenation Study

08:23 What Actually Counts As Age-Related Damage?

13:59 Can Mouse Longevity Research Translate To Humans?

16:25 How Do We Measure Anti-Aging Effects In Humans?

20:36 Can The First Person To Live To 1,000 Already Be Alive?

23:18 Longevity Escape Velocity Explained

28:16 Did Aubrey's First Mouse Rejuvenation Study Work?

32:11 How Do You Choose Which Longevity Interventions To Combine?

37:37 SENS vs The Hallmarks Of Aging

43:32 What Has Aubrey Changed His Mind About?

45:39 What Should People Actually Do Today?

47:54 Why Longevity Research Struggles To Get Funded

53:32 Prevention vs Rejuvenation

55:35 What Aubrey Would Change About Science

57:16 The Strongest Argument That Aging Can Be Repaired

58:08 Aubrey's Personal Longevity Protocol

58:41 Are Biological Age Clocks Actually Useful?

01:00:18 How Should Healthcare Change?

━━━━━💡 KEY QUESTIONS ANSWERED━━━━━

• Is aging actually a disease?

• What does Aubrey de Grey mean by accumulated biological damage?

• Can age-related damage actually be repaired?

• What is longevity escape velocity?

• Could the first person to live to 1,000 already be alive?

• What happened in Aubrey's first robust mouse rejuvenation experiment?

• Why is he now testing a combination of eight interventions?

• Can longevity results in mice realistically translate to humans?

• How can we test rejuvenation therapies without waiting decades for mortality data?

• What is the difference between the SENS framework and the Hallmarks of Aging?

• Are biological age and epigenetic clocks reliable enough for clinical trials?

• What has Aubrey changed his mind about after more than two decades?

• Why does he think current research funding creates the wrong incentives?

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Connect with Aubrey:

Longevity Escape Velocity Foundation: https://www.levf.org/

X / Twitter: https://x.com/aubreydegrey

LinkedIn: https://www.linkedin.com/in/aubrey-de-grey-24260b/

What if one of the most popular ideas about cancer is simply wrong?

For years, social media has promoted the idea that cancer is primarily a metabolic disease - one that can be starved, hacked, or even reversed through diet. But cancer geneticist Dr Moritz Przybilla argues that decades of genomic research tell a very different story.

In this episode of Return on Health, hosts Niko Hems and Miguel Medina explore why cancer is fundamentally a disease of DNA, why aging remains its greatest risk factor, what the evidence really says about ketogenic diets and sugar, and where cancer research is genuinely moving next.

Moritz also explains why most people misunderstand cancer prevention, why early detection may save far more lives than chasing miracle cures, how healthy tissues quietly accumulate mutations throughout life, and why the future of cancer medicine may lie in predicting risk decades before a tumor ever appears.

━━━━👤 ABOUT THE GUEST━━━━━

Dr. Moritz Jakob Przybylla is a cancer researcher at the Wellcome Sanger Institute in Cambridge. His research focuses on cancer genomics, early cancer evolution, and developing new approaches for cancer risk prediction, prevention, and early detection. Alongside his research, Moritz is passionate about making cancer science accessible and combating misinformation with evidence-based education.

━━━━🎙️ ABOUT THE HOSTS━━━━

Niko HemsNiko Hems is a longevity expert and Head of Growth at YEARS, a company building a longitudinal, multi-modal health dataset to make prevention personal and data-driven.

Miguel MedinaMiguel Medina is co-host of Return on Health, a podcast built on a simple idea: a system always produces the outcomes it's incentivized to produce - so if we want better health outcomes, we need better incentives.

━━━━⏱ CHAPTERS━━━━━

00:00 The Biggest Cancer Myth

00:57 Meet Cancer Geneticist Dr. Moritz Gerstung

02:04 Why He Left The Lab To Build A Public Voice

07:58 What Cancer Actually Is (Explained Simply)

12:21 Can You Really Prevent Cancer?

15:32 Which Infections Increase Cancer Risk?

17:15 Driver vs Passenger Mutations Explained

19:57 Thomas Seyfried's Metabolic Theory Of Cancer

28:49 Do Ketogenic Diets Help Treat Cancer?

32:59 Are 60% Of Cancers Really Unpreventable?

41:18 Metformin, Aging & Cancer Prevention

43:07 If We Could Slow Aging, Would We Prevent Cancer?

46:14 The Most Overhyped Cancer & Longevity Trends

47:11 Which Cancer Screening Test Should You Actually Get?

48:16 Moritz's Dream Cancer Research Project

49:35 How Healthcare Should Change

━━━━━💡 KEY QUESTIONS ANSWERED━━━━━

• Is cancer really a genetic disease?• Is the metabolic theory of cancer supported by current evidence?• Can sugar actually "feed" cancer?• Does the ketogenic diet help treat cancer?• Why are around 60% of cancers currently unavoidable?• Why is aging the biggest risk factor for cancer?• What are driver mutations and passenger mutations?• Can we predict cancer decades before it develops?• Which cancer screening tests are actually worth doing?• What is the future of cancer prevention?• How should healthcare shift from treating disease to preventing it?

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Connect with Moritz:

Linkedin: https://www.linkedin.com/in/moritz-jakob-przybilla/?locale=en

Instagram: https://www.instagram.com/dr.moritzprzy/?hl=en