Mikkipedia

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This week on the podcast, Mikki speaks to Dr Matt Nagra, a naturopathic doctor and researcher known for his evidence-based perspective on nutrition, with a particular focus on plant-based diets and chronic disease.

In this episode, the conversation tackles one of the most debated topics in nutrition right now: protein. Matt helps unpack why protein has become such a focal point, how to interpret the current evidence, and what outcomes actually matter when we’re talking about intake and health. They explore the long-standing protein RDA and what it was designed to represent.

The discussion then moves into protein quality, addressing common claims around plant versus animal protein, and why mechanistic research doesn’t always align with long-term health outcomes. Matt also provides important context around dietary patterns and chronic disease risk, helping to separate the role of protein itself from the broader way people eat.

They finish with a dive into choline, covering its role in the body, how it interacts with other nutrients like folate and betaine, and what this means for people following predominantly plant-based diets.

It’s a thoughtful, nuanced conversation that cuts through the noise and brings clarity to some of the biggest questions in modern nutrition.

Dr Matt Nagra is a naturopathic doctor who graduated from the Boucher Institute after completing a Bachelor of Science in Microbiology at the University of Victoria. He holds additional board certifications in prescriptive authority, immunisations, advanced injection therapies, intravenous therapies, and acupuncture. Using an evidence-based approach, he creates individualised treatment protocols tailored to each patient’s health goals and lifestyle.

He has a particular passion for plant-based and vegan nutrition, physical medicine, and chronic disease treatment. With additional training in nutrition, he holds a Plant-Based Nutrition Certification from Cornell University and the T. Colin Campbell Center for Nutrition Studies, where he has also authored multiple articles. His work aims to support individuals in thriving on plant-based diets, while bridging the gap between lifestyle-based interventions and medical care.

Choline paper: https://www.academia.edu/3067-1345/2/4/10.20935/AcadNutr8085

Instagram: @dr.matthewnagra

Dr. Nagra’s website

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In this Mini Mikkipedia episode, Mikki explores the concept of metabolic memory—a powerful and often overlooked driver of long-term health. Drawing on landmark studies like DCCT and UKPDS, she explains how periods of poor metabolic health can leave a lasting imprint, continuing to influence disease risk even after markers like blood glucose are brought back under control. But it’s not all bad news. Mikki also unpacks the flip side: how positive adaptations from training, nutrition, and metabolic challenges can create a beneficial “memory” that helps the body rebound faster and perform better over time. From epigenetics to mitochondrial function, this episode highlights why timing matters and why early intervention—and consistency—can shape your metabolic future. 

Highlights:

•  What metabolic memory is and where the concept originated 
•  The “legacy effect” in diabetes research and why early control matters 
•  Cellular mechanisms: epigenetics, oxidative stress, and AGEs 
•  The positive side: training, ketosis, and metabolic flexibility 
•  Why your past habits—good or bad—continue to influence your health

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This week on the podcast Mikki speaks to returning guest Professor Emeritus Don Layman, a leading nutrition scientist whose work has been central to how we understand protein, metabolism, and the role of diet in long-term health.

In this episode, the conversation starts at the top—unpacking what dietary guidelines actually are, why they exist, and how they came to shape the way we think about food at a population level. Don walks through the historical context behind early guidelines, including where things may have gone off track, particularly around the treatment of fat, cholesterol, and protein-rich foods.

From there, the discussion moves into the science. Don outlines the limitations of relying heavily on observational nutrition research and contrasts this with findings from controlled trials, particularly in relation to protein requirements and metabolic health. He explains why he recommended a shift to the new protein targets to better support muscle, satiety, and overall health.

Dr. Donald Layman is Professor Emeritus in the Department of Food Science & Human Nutrition at the University of Illinois at Urbana-Champaign. Dr. Layman has been a leader in research about protein, nutrition for athletic performance, obesity, diabetes and cardiovascular health. Dr. Layman has over 100 peer-reviewed publications.

He has received numerous awards for his research from the American Society for Nutrition and the National Institutes for Health and for his nutrition teaching. Dr. Layman currently serves as Associate Editor of the Journal of Nutrition Education and Behavior and on the editorial boards of Nutrition & Metabolism, and Nutrition Research and Practice. Dr. Layman has an extensive consulting background including work with NASA, the Shriners Children’s Hospital, the US Air Force plus numerous food companies and organizations including Kraft Foods, Nestlé, Agropur and the National Dairy Council. Dr. Layman earned his doctorate in human nutrition and biochemistry at the University of Minnesota.

Prof Layman publications: https://www.researchgate.net/profile/Donald-Layman

Conversations with Dr Lyon: https://www.youtube.com/playlist?list=PLx1_K-1RwcGTt25RbHqXYcRaQm6rD3Ce7

Prof Layman on Twitter: https://twitter.com/donlayman

Previous podcasts

 https://podcast.mikkiwilliden.com/55

 https://podcast.mikkiwilliden.com/238

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In this Mini Mikkipedia episode, Mikki breaks down one of the most persistent nutrition debates: are high-protein diets actually harmful? Drawing on a recent perspective paper published in the American Journal of Clinical Nutrition, she unpacks common claims around kidney damage, bone loss, diabetes risk, and reduced longevity. Rather than dismissing concerns outright, Mikki walks through what the research truly shows, highlighting key methodological flaws, the limits of observational data, and the importance of context. From overfeeding studies to real-world dietary patterns, this episode challenges headline-driven narratives and brings nuance back into the conversation. If you’ve ever questioned whether your protein intake is “too high,” this is a grounded, evidence-informed discussion to help you cut through the noise and make more confident decisions.

Highlights:

•  Why the “protein turns to fat” claim doesn’t hold up in real-world studies 
•  The truth about protein intake and kidney health in healthy individuals 
•  How higher protein diets impact bone density and fracture risk 
•  The nuance behind protein, insulin resistance, and type 2 diabetes 
•  Why observational data often misleads protein-related health claims

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This week on the podcast, Mikki speaks to naturopath Rachel Arthur, who specialises in micronutrients and their role in human health and performance. In this conversation, they take a step back from the noise around supplements and dig into what actually matters when it comes to nutrient status.

Rachel shares her perspective on how we assess whether people are truly well nourished, why intake doesn’t always reflect what the body is using, and where common gaps can arise even in those eating a generally “good” diet. They explore the nuance of absorption, bioavailability, and individual requirements, along with the limitations of current guidelines and standard testing.

The discussion also moves into practical territory, covering how to think about supplementation, the importance of nutrient forms and interactions, and what active individuals and those pursuing fat loss should keep in mind when it comes to optimising micronutrient status without overcomplicating the process.

Rachel https://rachelarthur.com.au/rachel/

Nutrient Prescriber course: https://rachelarthur.com.au/product/the-nutrient-prescribers-program-full-access-13hrs-video-notes/

Rachel Arthur is a seasoned naturopath and registered nutritionist with a specialisation in integrative nutrition and diagnostics. With three decades of experience spanning clinical practice and educational settings, Rachel has established herself as a leading educator in the field of nutritional medicine. Her work is deeply rooted in evidence-based practices, contributing to renowned texts such as the award-winning Herbs & Natural Supplements – An Evidence-Based Guide across all four editions.

Delivering advanced training and mentorship to a wide range of healthcare professionals, including doctors, pharmacists, dietitians, and naturopaths, her educational initiatives, such as the popular Update in Under 30 podcast, reflect her dedication to providing practical, actionable insights that empower clinicians to integrate nutritional strategies into their practice effectively.

With a passion for integrative health and an ongoing dedication to professional development, Rachel's presentations are not only informative but also transformative, making a significant impact on the practitioners she mentors.

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This week, Mikki breaks down one of the most common (and misunderstood) questions in fat loss and health: what should your body fat percentage actually be? Drawing on current research, she explains why body fat isn’t just “dead weight” but an active endocrine organ that plays a critical role in metabolism, hormones, and overall health. Mikki unpacks the difference between subcutaneous and visceral fat, why where you store fat matters, and how risk increases at higher levels. She also explores the lack of a universal “ideal” number, highlighting how factors like age, sex, and ethnicity influence healthy ranges. Finally, she cuts through the noise on body composition measurements, from DEXA to BIA, and offers practical guidance on what to focus on instead of chasing a single number. 

Key Highlights:

•  Why body fat is metabolically active and essential for health 
•  The critical difference between subcutaneous and visceral fat 
•  Evidence-based body fat ranges for men and women 
•  Limitations of common measurement tools like BIA and DEXA 
•  Why health is more than just a body fat percentage 

Contact Mikki:
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This week on the podcast, Mikki speaks to David Scott, Professor of Clinical Epidemiology at Monash University and a leading expert in muscle health, ageing, and body composition.

In this episode, the conversation centres on one of the most important areas of metabolic health: skeletal muscle. Prof Scott unpacks why muscle mass and function are critical for healthy ageing, and how this becomes increasingly complex in the context of obesity, weight loss, and modern treatment approaches.

Mikki and Prof Scott explore the tension between improving metabolic health and preserving muscle, including what happens to lean mass during weight loss and why muscle quality matters as much as quantity. They also discuss practical strategies around resistance training and protein, and how these may need to shift across the lifespan.

The discussion then turns to GLP-1 receptor agonists and their growing role in obesity management, examining what we know so far about their impact on muscle mass, strength, and long-term health outcomes.

This is a broad, evidence-based conversation that brings muscle back to the centre of the metabolic health discussion, with clear takeaways for both clinicians and individuals.

David Scott is a Professor of Clinical Epidemiology at Monash University, with a research focus on musculoskeletal health, ageing, and body composition.

His work centres on understanding and preventing age-related declines in muscle mass and function, including sarcopenia and frailty. He has a particular interest in how lifestyle factors such as nutrition, physical activity, and body weight influence muscle quality, strength, and overall functional capacity across the lifespan.

Professor Scott’s research also explores the intersection of obesity and muscle health, including the concept of sarcopenic obesity, as well as the effects of weight loss and emerging therapies on lean mass and physical function. His work contributes to the development of evidence-based strategies to support healthy ageing, maintain independence, and reduce the burden of chronic disease.

Professor Dave Scott: https://www.monash.edu/medicine/scs/researchers/david-scott 

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This week, Mikki breaks down a major 2025 study using UK Biobank wearable data to challenge one of the most widely accepted rules in exercise science. For decades, we’ve been told that one minute of vigorous activity equals two minutes of moderate activity. But the data tells a very different story. Drawing from over 73,000 participants, this episode unpacks how vigorous movement may be four to ten times more effective depending on the health outcome. Mikki explains what actually counts as “vigorous” (it’s more accessible than you think), the physiological mechanisms driving these benefits, and how small bursts of effort throughout your day can meaningfully impact long-term health. This is a practical, evidence-based rethink of how to approach movement for metabolic health, cardiovascular fitness, and longevity.

Key Highlights:

•  Why the long-standing 1:2 activity ratio doesn’t hold up 
•  What “vigorous” really means in real-world terms 
•  How short bursts of effort impact cardiovascular and metabolic health 
•  The surprising limits of light activity for disease risk reduction 
•  Practical ways to incorporate high-value movement into daily life

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This week on the podcast, Mikki speaks to returning guest Associate Professor José Areta to unpack one of the most debated topics in sports nutrition: energy availability, and what really happens when intake drops below demand.

José takes a clear, physiology-first approach to explaining what energy availability actually means, why it has become such a dominant concept in exercise science, and whether the current narrative has become overly black-and-white. They explore his recent study examining the effects of a short, aggressive energy deficit, including what happens not just at a whole-body level, but deep within muscle tissue itself.

In this conversation, they discuss the hormonal and metabolic responses to rapid weight loss, surprising findings around mitochondrial protein synthesis, and what changes in muscle and connective tissue might actually represent. José also reframes energy deficit as a biological stressor — one that may be adaptive in the right context — and challenges assumptions around how common and harmful low energy availability truly is.

This is a nuanced, evidence-driven discussion that cuts through the noise and offers a more balanced perspective on energy deficit, performance, and long-term health.

José L Areta currently works as an associate professor in Sports Nutrition and Metabolism at the School of Sport and Exercise Sciences at LJMU.

José examines how nutrition interacts with exercise to shape both performance and health, with a focus on macronutrient timing and composition, the role of supplements in optimisation, and the hormonal and metabolic responses to energy restriction.

José can be found at:https://profiles.ljmu.ac.uk/13460-jose-areta 

Paper: https://pubmed.ncbi.nlm.nih.gov/41182317/

Previous appearance https://podcast.mikkiwilliden.com/124 

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In this Mini Mikkipedia episode, Mikki unpacks one of the most common yet misunderstood issues in modern health: the interplay between cortisol, stress, poor sleep, and elevated heart rate. Using a real community question as the foundation, she explains why feeling “wired but tired” isn’t a personal failing, but a physiological response to chronic, unresolved stress.

Mikki walks through how cortisol actually works, why both exercise and life stress use the same biological pathways, and what happens when your system never fully downregulates. She also explores the role of the HPA axis, autonomic nervous system imbalance, and why tools like HRV and resting heart rate can offer insight—but also create more stress if misused.

Most importantly, this episode delivers practical, evidence-based strategies to help restore balance and build resilience. 

Key Highlights:

•  Why cortisol is not the villain—and what it actually does 
•  The difference between acute stress and chronic, unresolved stress 
•  What a high morning heart rate is really telling you 
•  How lifestyle, hydration, and training load impact your stress response 
•  Practical tools to downregulate your nervous system

Contact Mikki:
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