Sigma Nutrition Radio
The podcast for lovers of nutrition science! Listen to detailed discussions with researchers and leading experts about the science of nutrition, dietetics and health.
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#584: EAT-Lancet: Does the Planetary Health Diet Improve Human Health?
11/18/2025
#584: EAT-Lancet: Does the Planetary Health Diet Improve Human Health?
How should we think about diets that claim to optimise both human and planetary health? Can a single “reference diet” really balance the complex trade-offs between nutrition adequacy, chronic disease prevention, and environmental sustainability? These questions have gained renewed attention with the release of the 2025 update to the EAT-Lancet Planetary Health Diet. The original 2019 report proposed a mostly plant-based dietary pattern designed to improve population health while staying within planetary boundaries. But since then, new data have emerged—on nutrient requirements, disease risk, and environmental modelling—that complicate many of the original assumptions. What does the updated evidence actually say about the health impacts of eating in line with this framework? How have the environmental projections changed? And what do these evolving targets mean for individuals, policymakers, and researchers trying to translate broad sustainability goals into practical dietary guidance? These are some of the questions explored in this episode of Sigma Nutrition, which examines the 2025 EAT-Lancet update, its scientific foundations, and what it reveals about the intersection of nutrition, health, and planetary sustainability. Timestamps [01:46] Focus on the 2025 EAT-Lancet report [02:27] Overview of the Planetary Health Diet [03:13] Comparing 2019 and 2025 reports [03:40] Dietary recommendations and nutrient targets [04:14] Health and environmental impacts [09:12] Scoring methods and dietary patterns [27:00] Mortality and chronic disease outcomes [40:01] Type 2 diabetes [44:13] Neuroimaging and cognitive outcomes [49:48] Conclusions and practical implications [58:55] Key ideas segment (Premium-only) Links & Resources Go to Join the for free Subscribe to Alan Flanagan’s Enroll in the next cohort of our course Report:
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#583: Ultra-Processed Foods & Fixing the Food Environment – Kevin Hall, PhD
11/11/2025
#583: Ultra-Processed Foods & Fixing the Food Environment – Kevin Hall, PhD
Ultra-processed foods have become central to the way we eat and to many of the challenges we face in public health nutrition. They dominate supermarket shelves, shape population diets, and often appear as the prime suspect in rising obesity and metabolic disease rates. But beyond the label itself, what exactly makes these foods problematic? Is it their nutrient composition, their texture and palatability, the rate at which we consume them, or the broader environments that make them so accessible and appealing? The debate around ultra-processed foods sits at the intersection of metabolic science, behaviour, and policy. It raises uncomfortable questions about how food systems evolved to prioritise convenience and profit, and what it might take to meaningfully change that trajectory. In this episode, Dr. Kevin Hall joins the podcast to examine the evidence from controlled feeding studies and population research, exploring what we really know about ultra-processed foods, overeating, and how we might begin to fix the food environment. Timestamps [04:24] Dr. Hall’s background and career [06:47] Ultra processed foods and health [15:10] Mechanisms behind ultra processed foods [27:00] Healthy ultra processed foods: a possibility? [30:43] Minimizing ultra processed foods in different cultures [33:03] Policy and regulation for better food quality [44:26] The importance of pilot studies in policy implementation [49:10] Future of food and sustainable diets [51:50] Key ideas segment (Premium-only) Links & Resources Go to Join the for free Subscribe to Enroll in the next cohort of our course X: Book: Previous episodes with Dr. Hall: #429, 376, 165, 88
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SNP45: Antioxidants – What You Need To Know
11/04/2025
SNP45: Antioxidants – What You Need To Know
This is a Premium-exclusive episode of the podcast. To listen to the full episode you need to be subscribed to . What exactly are “antioxidants,” and why do they get so much hype? We often hear that blueberries, dark chocolate, and red wine are healthy because they’re packed with antioxidants – but is the story really as simple as “more antioxidants = better health”? In this episode, Danny explores the true role of antioxidants in the body, challenging simplistic narratives. Are antioxidants magic molecules that single-handedly prevent aging and disease? Or is the reality more nuanced, with context and balance being key? We delve into these intriguing questions to clarify what antioxidants are, how they work, and what the current consensus tells us about using them for health. Antioxidants are frequently credited as the reason why colorful fruits and vegetables are beneficial. Yet, as past Sigma episodes on polyphenols have noted, the benefits of those plant foods aren’t primarily due to direct antioxidant effects. Here we untangle common misconceptions (e.g., “antioxidants = health, always”), distinguish between different types of antioxidants, and explain why simply taking high-dose antioxidant supplements isn’t a guarantee of protection – and in some cases might even backfire. By the end, health professionals and science-savvy listeners will understand the diverse roles of antioxidants, the importance of balance, and how to apply this knowledge in practice. Timestamps [01:27] Understanding antioxidants [04:19] The role of free radicals [08:43] Endogenous antioxidant systems [09:58] Dietary antioxidants [16:03] Polyphenols and their impact [24:28] Health benefits of polyphenols [27:39] Antioxidants in cognitive function [36:47] Practical takeaways on antioxidants Links & Resources: Subscribe to Go to the Join the for free Become a member of Alan Flanagan’s Enroll in the next cohort of our course See all our other Instagram: X:
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#582: GLP-1 Agonists: Side Effects, Management and Diet – Dr. Spencer Nadolsky
10/28/2025
#582: GLP-1 Agonists: Side Effects, Management and Diet – Dr. Spencer Nadolsky
GLP-1 receptor agonists have emerged as a groundbreaking tool in obesity treatment. In this episode, Dr. Spencer Nadolsky (an obesity specialist) explains how these medications are now yielding unprecedented weight loss outcomes in people with obesity. The discussion centers on GLP-1 agonist drugs like semaglutide and tirzepatide: how they work, how much weight loss they can produce, and why they represent a paradigm shift in obesity management. Importantly, the conversation addresses practical aspects of using these drugs, including managing their side effects and optimizing patients’ diet and lifestyle while on therapy. This topic is of great significance to nutrition science, clinical practice, and public health. Obesity is a chronic, relapsing condition that has proven difficult to treat with lifestyle changes alone. The advent of GLP-1 agonists offers new hope by inducing weight loss levels previously seen only with surgical interventions. Understanding these medications is crucial for healthcare professionals: it enables evidence-based prescribing, proper patient counseling on diet and side effects, and integration of medication with lifestyle interventions. Discussing safety and long-term use is vital, as millions more patients might use these drugs in coming years. From a public health perspective, GLP-1 agonists prompt debates about access and cost, given their high price and life-changing potential. Timestamps [03:25] Conversation with Dr. Spencer Nadolsky begins [05:24] Mechanism and types of GLP-1 medications [07:55] Efficacy and weight loss results [16:53] Common side effects and management [22:57] Muscle loss concerns and clinical insights [28:09] Addressing nutritional concerns with GLP-1 medications [29:38] Exploring potential benefits beyond weight loss [33:48] Marketing and misconceptions around GLP-1 [36:59] Public health and accessibility issues [43:25] Future research [46:16] Key ideas segment (Premium-only) Related Resources Go to Join the for free Subscribe to Enroll in the next cohort of our course Instagram: Related episodes:
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#581: What Is Successful Public Nutrition Policy? And Why Is It So Hard to Achieve? – Emily Callahan, RD, MPH
10/21/2025
#581: What Is Successful Public Nutrition Policy? And Why Is It So Hard to Achieve? – Emily Callahan, RD, MPH
Public nutrition policy plays a critical role in shaping population health through laws, guidelines, and programs that influence what people eat. In this episode, Emily Callahan, an expert in nutrition policy, talks about why public nutrition policies often fall short and what “success” looks like. They discuss how evidence-based nutrition interventions can stall due to political or practical barriers, and explore examples ranging from federal food assistance programs to sodium reduction initiatives. Crucially, they address how to evaluate if a policy has worked and highlight emerging strategies (like integrating “food as medicine” into healthcare) that offer hope for better outcomes. This conversation is highly relevant for researchers, clinicians, and nutrition professionals, as it underscores the importance of policy in addressing nutrition challenges at the population level and examines how to design effective, data-driven policies for public health impact. Timestamps [05:09] Understanding public health nutrition policy [08:44] Examples of public nutrition policies [21:27] Challenges in implementing nutrition policies [31:24] Evaluating the success of nutrition policies [34:58] Sustainability and political viability of health policies [38:07] Food Is Medicine: a promising policy target [44:50] Medically tailored meals: evidence and implementation [48:55] The MAHA commission report and its implications [56:42] Future directions in nutrition policy [01:04:49] Key ideas segment (premium-only) Related Resources Join the for free Subscribe to Go to Enroll in the next cohort of our course JAMA Commentary:
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#580: Sodium Bicarbonate for Sports Performance – Prof. Lewis Gough
10/14/2025
#580: Sodium Bicarbonate for Sports Performance – Prof. Lewis Gough
Sodium bicarbonate is one of the most consistently supported ergogenic aids in sports nutrition research, yet its underlying mechanisms and real-world applications remain widely misunderstood. More recent developments have focused on how to optimise both the timing and formulation of supplementation. The “individualised ingestion timing” approach has emerged as a practical strategy, recognising that the time-to-peak blood bicarbonate concentration varies considerably between individuals. Similarly, novel formulations are being explored to address issues with gastrointestinal distress and practicality of dosing. These include topical approaches such as sodium bicarbonate lotion, and commercial products like Maurten’s “Bicarb System.” In this episode, Prof. Lewis Gough joins to discuss the latest evidence on sodium bicarbonate and performance, its mechanisms, novel delivery systems, and the key directions for future research. Dr. Lewis Gough is a Professor of Nutrition and Physiology at Birmingham City University. He is globally recognized for his research on sodium bicarbonate supplementation in sport, and his work spans applied sport and exercise nutrition, exercise metabolism, acid–base balance, and fatigue. Timestamps [03:12] Professor Gough’s academic journey [06:29] Mechanisms of sodium bicarbonate and historical perspective on lactate [11:21] Sodium bicarbonate’s role in performance [22:45] Individual responses to sodium bicarbonate [26:53] Timing strategies for sodium bicarbonate [32:38] Individualized approach to sodium bicarbonate timing [36:47] Traditional vs. novel delivery methods [44:27] Practical recommendations for athletes [51:18] Future research directions [01:02:08] Key Ideas segment Resources Go to (w/ links to relevant studies) Subscribe to Join the for free Enroll in the next cohort of our course See all of Sigma's
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#579: Is Your Chronotype Hard-Wired or Modifiable? And What Does It Mean for Health?
10/07/2025
#579: Is Your Chronotype Hard-Wired or Modifiable? And What Does It Mean for Health?
In this episode, we explore the concept of chronotype, which reflects an individual’s biological circadian timing and how it manifests in preferred sleep–wake patterns. Understanding chronotype is important because it differs from simple diurnal preference, which may be shaped by lifestyle or psychological factors rather than biology. We examine how chronotype is measured, from gold-standard laboratory methods to validated questionnaires used in field studies. The discussion also highlights the importance of accounting for sleep debt when estimating true biological timing. Finally, we consider the limitations of consumer devices and the practical implications of assessing chronotype in real-world settings. Timestamps [02:02] Understanding chronotypes [06:26] Measuring chronotypes [15:12] Genetic and environmental influences on chronotypes [28:34] Health implications of chronotypes [52:21] Practical applications Related Resources Join the for free Subscribe to Become a member of Alan Flanagan’s Enroll in the next cohort of our course Related previous episodes: 495, 470, 469
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#578: Creatine For Brain Health: Overhyped Trend or Science-based Intervention? – Prof. Eric Rawson
09/30/2025
#578: Creatine For Brain Health: Overhyped Trend or Science-based Intervention? – Prof. Eric Rawson
Creatine is best known as a sports supplement for enhancing muscle strength and high-intensity performance. But could it also improve brain health and cognitive function? Or are such claims overhyped? If creatine can support brain health, it could have implications for aging, neurodegenerative diseases, concussion recovery, and mental fatigue. In this podcast episode, Professor Eric Rawson discusses what current science says about creatine’s effects on the brain, including memory, executive function, and protection against neurological stress. Professor Rawson provides context on how creatine works in the body, why the brain might benefit, and what evidence exists so far. Eric Rawson, PhD is Professor and Chair in the Department of Health, Nutrition & Exercise Science at Messiah University. For over twenty years, his research has centered on the interplay between nutrition and skeletal muscle, notably investigating how creatine supplementation affects both muscle and brain function. Timestamps [03:14] Understanding creatine: biochemistry and history [07:55] Creatine supplementation and muscle performance [09:35] Creatine and brain health: emerging research [14:03] Measuring brain creatine: challenges and techniques [19:58] Cognitive benefits of creatine supplementation [26:23] Evaluating the evidence: caution and promise [30:45] Mega dosing and brain health protocols [32:04] Creatine for brain health: context matters [38:54] Creatine for brain injury and aging [51:25] Key ideas segment (Premium-only) Related Resources Join the for free Subscribe to Enroll in the next cohort of our course (see Related Resources section)
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Is There a Limit to Energy Expenditure? And What Happens When We Push It? (SNP44)
09/23/2025
Is There a Limit to Energy Expenditure? And What Happens When We Push It? (SNP44)
Energy expenditure is one of the most fundamental yet often misunderstood aspects of human physiology. A central question is whether there is a ceiling to how many calories we can burn, and what happens when activity levels approach that limit. Grasping these dynamics is essential for health professionals and researchers, as energy balance directly influences body weight regulation, metabolic health, and athletic performance. Emerging research shows that our bodies regulate calorie burn not in a fixed manner, but through adaptation and compensation, revealing that the “calories in vs. calories out” model is far more dynamic than it may first appear. In this episode, we revisit key insights from experts such as Dr. Herman Pontzer, Dr. Brent Ruby, Dr. Mark Hopkins, Dr. Eric Trexler, and Dr. Chris Melby. These perspectives cover how the body adapts to different levels of physical activity, the metabolic adjustments during weight loss (often called adaptive thermogenesis), and the concept of energy flux in weight maintenance. Note: This episode is one of our Premium-exclusive episodes. To listen to the full episode, you’ll need to be a and access the episode on the private Premium feed. Otherwise, you can hear a preview of the episode on the public feed of the podcast. Timestamps [03:36] Contrained model of energy expendiure [12:33] What is the ceiling of human energy expenditure? [13:05] Reconciling energy intake and expenditure [13:32] Variability in metabolic rates [15:16] Adaptive thermogenesis and weight loss [18:37] Metabolic adaptation explained [31:51] Energy flux and weight maintenance Resources Go to Article: Included episodes: 208 – Herman Pontzer, PhD | Constrained Energy Expenditure Model & Evolutionary Biology of Energy Balance 124 – Brent Ruby, PhD | The Human Ceiling of Energy Expenditure 299 – Mark Hopkins, PhD | Compensatory Eating & Activity Energy Expenditure 377 – Herman Pontzer, PhD | Metabolism, Mitochondria & Measuring Energy Expenditure 484 – Eric Trexler, PhD | Is Metabolic Adaptation an Illusion? 318 – Chris Melby, DrPH | Impact of Energy Flux on Weight Management
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#577: Ultra-processed vs. Minimally Processed Diets: UPDATE Trial – Samuel Dicken, PhD
09/16/2025
#577: Ultra-processed vs. Minimally Processed Diets: UPDATE Trial – Samuel Dicken, PhD
Recently a new trial was published in Nature Medicine comparing the effect of ultra-processed versus minimally processed diets. Specifically, the UPDATE trial compared these two diets in the context of a healthy dietary pattern (in line with the UK’s EatWell Guide). This eight-week randomized, crossover trial generated a lot of discussion and was largely seen as being a really useful addition to the evidence base, and providing answers to some previously unexamined questions. In this episode the study’s lead author, Dr. Samuel Dicken, explains the background context for the UPDATE trial, provides an insight into its execution, and puts some of the results in context. There is also a discussion about the current state of evidence more broadly and the leading hypotheses around the mechanisms that drive the observations seen with consuming ultra-processed foods. This episode is particularly noteworthy because it provides fresh evidence on an important question: does following dietary guidelines with minimally processed foods confer extra benefits over following the same guidelines with ultra-processed foods? Timestamps [02:48] Interview with Dr. Samuel Dicken [03:08] Background and research interests of Dr. Samuel Dicken [04:31] Details of the update trial [09:48] Trial design and methodology [15:45] Results and findings of the update trial [18:46] Secondary outcomes and craving control [25:43] Hypotheses and mechanisms behind UPF effects [40:28] Policy implications and future research directions Related Resources Subscribe to Go to Join the for free Enroll in the next cohort of our course Study: LinkedIn: X:
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#576: The Social Psychology of Health Beliefs and Misinformation – Matthew Facciani, PhD
09/09/2025
#576: The Social Psychology of Health Beliefs and Misinformation – Matthew Facciani, PhD
In this episode, Dr. Matthew Facciani explores how social psychology influences health beliefs and the spread of misinformation. The conversation delves into why people adopt certain nutrition or health beliefs so strongly, how identity and group membership shape our interpretation of evidence, and what makes us susceptible to false or misleading health claims. Dr. Facciani’s interdisciplinary background (spanning neuroscience, psychology, and sociology) allows him to offer a unique evidence-informed perspective on these issues. The episode centers on understanding the social forces behind health-related attitudes and how we might improve communication and critical thinking in the face of rampant misinformation. This topic is highly relevant for health professionals and researchers because misinformation about nutrition, health, and medicine can lead to poor decisions, vaccine hesitancy, or harmful fad diets. By understanding the psychological drivers that cause people to cling to unscientific beliefs, practitioners can better address patients’ concerns and correct false claims. Matthew Facciani is a postdoctoral researcher at The University of Notre Dame in the Computer Science and Engineering Department. He is an interdisciplinary social scientist with a background in neuroscience and psychology and holds a PhD in sociology. His research focuses on media literacy, misinformation, social networks, political polarization, identities, and artificial intelligence. Timestamps [01:41] Interview start [06:57] The role of identities in belief formation [16:01] Health attitudes and political identities [25:28] Improving dialogue and addressing misinformation [31:59] Does fact-checking work? [35:41] Media literacy and pre-bunking [44:03] Optimism and pessimism for the future [52:28] Key ideas segment (premium-only) Related Resources Go to Join the for free Subscribe to Enroll in the next cohort of our course Matthew’s book: Matthew’s Recommended episode:
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#575: How Does Dairy Impact Cardiometabolic Health? – Prof. Jean-Philippe Drouin-Chartier
09/02/2025
#575: How Does Dairy Impact Cardiometabolic Health? – Prof. Jean-Philippe Drouin-Chartier
Dairy is often treated as a single food group, yet milk, yogurt, cheese, and butter can have very different effects on health. Some evidence links yogurt to favourable outcomes, while butter is known to raise LDL cholesterol. And then there’s the paradox of cheese: high in saturated fat, but not consistently associated with higher heart disease risk. These complexities raise the question of whether the “dairy matrix” (the combination of nutrients and food structure) explains why not all dairy acts the same. In this episode, Prof. Jean-Philippe Drouin-Chartier, a nutrition researcher and registered dietitian, is on the show to examine what recent trials and large population studies tell us about dairy foods and cardiometabolic health. The discussion covers blood lipids, blood pressure, glucose metabolism, and how guidelines should interpret this evolving evidence. Timestamps [02:18] Interview start [09:38] Dairy consumption and type 2 diabetes [16:06] Dairy and cardiovascular disease [21:42] Dairy, blood pressure, and hypertension [25:56] Dietary guidelines and dairy [43:30] Key ideas segment (Premium-only) Related Resources Subscribe to Join the for free Website: Enroll in the next cohort of our course Referenced studies
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#574: Microplastics & Health: What Do We Know? – Prof. Ian Mudway
08/26/2025
#574: Microplastics & Health: What Do We Know? – Prof. Ian Mudway
They’re in our oceans, our air, our food, and now even in our bodies. Microplastics, once a distant environmental issue, have become a topic of urgent relevance in medicine, public health, and nutrition. The idea that tiny plastic particles are circulating through the food chain and accumulating in human tissues has sparked headlines, speculation, and concern. But how much of this fear is grounded in solid science? And how much is still unknown? As the research into microplastics rapidly grows, so too does the confusion. Claims range from the plausible to the alarmist, yet the real picture is far more complex. What does current evidence actually tell us about the health implications of microplastic exposure? How do we weigh these emerging signals against the backdrop of other environmental threats we understand much better? And how should scientifically-minded practitioners think about this issue, especially when patients begin asking questions? This is a conversation that calls for clarity, nuance, and a rigorous look at what we know versus what remains speculative. In this episode, Professor Ian Mudway, an environmental toxicologist, discusses the current scientific understanding of microplastics and human health. Timestamps [03:31] The public’s fascination with microplastics [08:35] Defining microplastics and nanoplastics [11:35] Environmental presence of microplastics [14:54] Human exposure to microplastics [18:23] Challenges in measuring microplastics [21:38] Public perception vs. scientific reality [27:08] Challenges in microplastic research [29:53] Environmental impact and human health [33:08] Complexities of plastic additives [40:34] Future directions in microplastic research [48:09] Key ideas segment (Premium-only) Resources Subscribe to Join the for free Enroll in the next cohort of our course Go to
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#573: A Philosophy of Elite Performance Nutrition – Daniel Davey
08/12/2025
#573: A Philosophy of Elite Performance Nutrition – Daniel Davey
In this episode, performance nutritionist Daniel Davey discusses how his approach to elite sports nutrition has evolved over his career. Davey reflects on his decade working with top Irish teams (Dublin GAA/football and Leinster Rugby) and how stepping away from those environments led him to rethink the role of a nutrition practitioner. The central theme is a shift from a traditional prescriptive model, where the expert provides meal plans and quick solutions, to a philosophy centered on athlete empowerment, education, and long-term habit development. Davey emphasizes that true high performance is achieved not by spoon-feeding athletes every nutrient, but by cultivating their independence, adaptability, and ownership of the process. This episode delves into practical strategies for fostering that ownership, such as encouraging self-reflection, building a supportive “nutrition culture,” and focusing on sustainable habits over short-term fixes. This discussion is highly relevant to nutrition science and clinical practice because it addresses the often-overlooked behavioral and cultural aspects of dietary change. Health professionals will recognize parallels to coaching clients in any setting: the importance of engaging individuals in their own nutrition planning, the value of reflective practice, and the balance between providing support and encouraging autonomy. Timestamps [02:38] Interview start [07:29] Empowering athletes [12:36] Challenges and reflections [16:53] Practical applications and philosophy [23:33] Building sustainable habits [28:00] Empowering decision-making through clarity [30:03] The importance of consistency and planning [31:47] Leadership and team dynamics [34:38] Personal growth and overcoming challenges [40:27] The concept of non-negotiables [52:31] Key ideas segment Resources Join the for free Subscribe to Enroll in the next cohort of our course See Sigma's Daniel Davey’s previous appearences on the podcast: go to episodes 306 and 194
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#572: Can You Trust Industry-Funded Nutrition Studies? Here’s How to Tell
08/05/2025
#572: Can You Trust Industry-Funded Nutrition Studies? Here’s How to Tell
Nutrition science plays a pivotal role in shaping public health advice, but the influence of industry funding on research has become a pressing concern. In this episode we want to examine whether we can trust nutrition studies funded by food and beverage companies, and how you can discern study credibility. The discussion is highly relevant in today’s landscape, where conflicts of interest and bias in research are under scrutiny amidst debates on sugar, processed foods, and diet recommendations. By exploring how industry sponsorship might skew results or interpretations, this episode speaks to broader issues of scientific trustworthiness and evidence-based policy in nutrition and public health. In this episode, we take a look at some recent publications that showed how study results and reporting differed significantly depending on if industry had funded the study or not. We delve into how this happens. As most often it is not a case of data fabrication or corruption, but rather how bias leads to studies being designed and reported differently. We walk through some examples, as well as highlighting some industry-funded studies that didn’t provide a “pro-industry” result and conclusion. The hope is that the episode allows you to understand why this is a problem, how to spot it, and how to know if you can trust the results of an industry-funded study. Timestamps [00:36] Alan’s upcoming study [04:47] Discussion on industry funding in nutrition research [15:06] Case study: industry influence on red meat research [30:43] Case study: artificial sweeteners and industry influence [36:37] Case study: sugar industry’s role in research [38:06] Critical appraisal of industry-funded studies [51:58] Case study: when industry-funded study results can be trusted [01:01:51] Guidelines for assessing research quality [01:07:14] Key ideas segment (premium-only) Related Resources Join the for free Subscribe to Join Alan's Enroll in the next cohort of our course Recommended episode: Studies mentioned: Tobias, 2025 –
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#571: Is Zone 2 Training Actually Best for Health? – Prof. Brendon Gurd
07/29/2025
#571: Is Zone 2 Training Actually Best for Health? – Prof. Brendon Gurd
In recent years “Zone 2 training” has gained immense popularity in fitness and health circles, often being proclaimed the “best” cardiovascular training for metabolic health. Zone 2 training is sustained, low-intensity exercise below the lactate threshold that is commonly employed by many elite level endurance athletes, with a variety of proposed performance benefits. This led to interest from health-conscious folks about its ability to improve markers like VO2 max and mitochondrial function, which are associated with better health outcomes and longevity. Prof. Brendon Gurd, an exercise physiologist at Queen’s University, is the co-author of a recent review published in Sports Medicine that examined some of the claims made around zone 2 training and health in the general population. This episode looks at whether the evidence truly supports Zone 2 as a uniquely effective training zone or if this hype has outpaced the research. These insights help professionals and individuals make evidence-based recommendations and avoid unintended negative consequences of following certain ideas. About The Guest Dr. Brendon Gurd is a Professor in the School of Kinesiology and Health Studies at Queen’s University, where his research focuses on exercise physiology and skeletal muscle adaptation. His work explores how different intensities and types of exercise influence mitochondrial content and function in muscle tissue, with the goal of understanding how to optimize health and performance through training. Timestamps [03:23] Discussion with Professor Brendan Gurd [05:56] Zone two training: Mechanisms and misconceptions [10:56] Practical applications and recommendations [22:16] Research gaps and future directions [35:47] Key ideas segment (Sigma Nutrition Premium) Links to Resources Subscribe to Join the for free Enroll in the next cohort of our course List of Sigma's Review paper: Lecture Slides:
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#570: Fructose: Metabolism, Claims & Context for Risk – Scott Harding, PhD
07/22/2025
#570: Fructose: Metabolism, Claims & Context for Risk – Scott Harding, PhD
Fructose has often been labeled a uniquely damaging nutrient, blamed for obesity, diabetes, and other metabolic diseases. But does fructose truly have unique harmful effects or are the risks associated with it related to context and quantity? The episode explores how fructose is metabolized in the body, why it gained a reputation for being problematic, and what the scientific evidence says about fructose in our diets. You will gain insight into why fructose was singled out in the past (e.g., its unique pathway in the liver and lack of insulin response), and how newer studies put those concerns into context. It covers important nuances for practitioners and health-conscious individuals, especially given public confusion and fear around fructose (even in fruit). Guest Information Dr. Scott Harding, Ph.D., is an Associate Professor of Nutritional Biochemistry in the Department of Biochemistry at Memorial University of Newfoundland. His research explores the complex interactions between diet, metabolism, and chronic disease, with a particular emphasis on the metabolic effects of dietary sugars (especially fructose), the role of fats and phytosterols in lipid metabolism, and how public health policies like sugar taxation influence population health outcomes. Timestamps [02:58] Dr. Harding’s academic background [08:45] Fructose metabolism in detail [12:51] Fructose in diet and public health [23:07] Current research [29:53] Identifying biomarkers for fructose overconsumption [31:12] Fructose impact on health [40:58] The food matrix [45:10] Personalized nutrition and future research directions [54:06] Key ideas segment (premium-only) Related Resources Subscribe to Join the for free Enroll in the next cohort of our course Related podcast episodes: #476, #468, #155 See Sigma's
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SNP42: Is Vitamin A Good or Bad for Bone Health?
07/15/2025
SNP42: Is Vitamin A Good or Bad for Bone Health?
Vitamin A is often one of the less-discussed micronutrients in relation to bone health, taking a back seat to nutrients like calcium and vitamin D. Yet this fat-soluble vitamin plays a fundamental role in skeletal development, remodeling, and mineral homeostasis. It influences gene expression in both osteoblasts and osteoclasts, and contributes to the regulation of bone turnover throughout the lifespan. But what makes vitamin A particularly interesting, and controversial, is that its effects on bone appear to follow a double-edged pattern. While it’s essential for bone formation, several large epidemiological studies have suggested that chronically high intakes of preformed vitamin A may actually increase the risk of osteoporosis and fracture, especially when consumed as retinol from supplements or high-liver diets. And yet, the picture is not so clear-cut. This raises compelling questions: Is the concern over vitamin A and bone health justified, or is it a case of context-dependent risk? Can vitamin A, when combined with adequate levels of D and K, actually support bone strength? And are there thresholds above or below which risk increases? In this episode, we explore the human evidence on vitamin A and skeletal health, looking not only at fracture outcomes and bone mineral density data, but also at nutrient interactions, mechanistic plausibility, and the implications for supplement use in well-nourished populations. Note: This is a Premium-exclusive episode, so you will only hear a preview on this public feed. Timestamps [00:23] Vitamin A and bone health: an overview [02:50] Forms of vitamin A: retinol and carotenoids [04:16] Mechanisms of vitamin A in bone physiology [17:52] Nutrient interactions: vitamin A, D, and K [31:03] Practical takeaways and recommendations Related Resources Subscribe to Join the for free Go to Enroll in the next cohort of our course
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#569: The History of Fat, Cholesterol & Heart Disease
07/08/2025
#569: The History of Fat, Cholesterol & Heart Disease
The idea that saturated fat might be harmful to our health has sparked controversy for decades. In recent years, counter-narratives have surged: suggesting that concerns over saturated fat were overblown, that LDL cholesterol doesn’t matter, or that the original diet-heart hypothesis has been debunked. These claims have become especially popular in online wellness spaces and certain dietary communities, often wrapped in compelling but misleading rhetoric. So what does the best available evidence actually say? And how should we think about saturated fat, LDL cholesterol, and cardiovascular risk in the current day? In this wide-ranging interview, originally recorded for the Chasing Clarity podcast, Alan and Danny explore the scientific consensus around saturated fat’s impact on blood lipids, why LDL and apoB are central to atherosclerotic disease, and how dietary patterns can meaningfully reduce risk. Importantly, they also address some of the most persistent myths and half-truths that fuel confusion, from flawed interpretations of the Seven Countries Study to misrepresentations of newer meta-analyses. Timestamps [03:41] How do we know saturated fat impacts LDL-C? [05:28] Metabolic ward studies and key findings [11:13] The Keys equation and subsequent research [17:17] Epidemiology and long-term studies [31:48] The Seven Countries Study [44:25] Understanding the impact of saturated fat on blood lipids [47:23] Historical and research perspectives on saturated fat [50:43] Practical dietary strategies for improving blood lipids [53:48] The Portfolio Diet and other dietary interventions [58:07] The role of pharmacology in managing blood lipids [01:00:58] Addressing misconceptions and common claims [01:13:57] Key ideas segment (premium-only) Related Resources Subscribe to Join the for free Enroll in the next cohort of our course Alan Flanagan’s Related episodes to add to your podcast queue: 532, 525, 515, 493, 481, 439
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#568: Does the Maternal Diet Impact Risk of ADHD & Autism? – David Horner, PhD
07/01/2025
#568: Does the Maternal Diet Impact Risk of ADHD & Autism? – David Horner, PhD
To what extent can maternal nutrition during pregnancy influence a child’s later cognitive or behavioural development? While genetic and environmental factors are known to contribute to neurodevelopmental outcomes such as ADHD and autism, growing attention is being paid to the potential role of prenatal exposures, including dietary patterns. Yet, evidence in this area remains limited, and causality is difficult to establish. One recent study aimed to explore this question by analysing how maternal diet quality during pregnancy (specifically, adherence to a Western-style dietary pattern) related to neurodevelopmental outcomes in children assessed clinically at age 10. In this episode, Dr. David Horner discusses the findings from this prospective cohort study, the use of metabolic markers to complement dietary data, and the implications for future research into modifiable prenatal risk factors. About The Guest Dr. David Horner is a researcher in maternal nutrition and cardiometabolic health, based at the University of Copenhagen, Denmark. He is also a qualified medical doctor from Queen’s University of Belfast. His research is driven by a keen interest in modifiable determinants of health, aiming to better understand and improve health outcomes. Having worked as a medical doctor for 2 years in the UK, in 2017 Dr. Horner then moved to Copenhagen, where he completed a Master’s in Global Health and a PhD examining the impact of maternal dietary patterns during pregnancy on child health. Timestamps [02:47] Introduction to the study [07:08] Strengths and findings of the study [21:17] Genetic factors and gene-environment interactions [25:42] Metabolomics and potential mechanisms [30:12] Interpreting the study’s findings [38:03] Future research directions [42:50] Key ideas segment (Sigma Nutrition Premium) Related Resources Subscribe to Join the for free Enroll in the next cohort of our course See Sigma's Email: david.horner@dbac.dk Study: (with discussion in the comments)
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#567: Did Big Sugar Hijack the Food Pyramid? Were Low-fat Diets a Scam that Damaged Our Health?
06/24/2025
#567: Did Big Sugar Hijack the Food Pyramid? Were Low-fat Diets a Scam that Damaged Our Health?
For decades, dietary guidelines—and the Food Pyramid in particular—have been at the center of heated debates and considerable controversy. These guidelines have often been accused of being influenced by industry interests, oversimplifying nutritional nuance, or even directly contributing to rising obesity and metabolic disease rates. In this episode, we critically assess common claims surrounding the Food Pyramid, including whether it was truly shaped by vested industry interests, if it encouraged harmful dietary shifts toward excessive carbohydrate and sugar consumption, and whether the subsequent health outcomes seen at the population level can be fairly attributed to these guidelines. Additionally, we evaluate the role of the sugar industry in funding key studies and publications, examining the implications such conflicts of interest may have had on nutritional science. Drawing on historical context, rigorous examination of scientific evidence, and an evaluation of how nutritional recommendations have evolved, this discussion aims to clarify misunderstandings, highlight legitimate criticisms, and separate fact from persistent myths regarding dietary guidance and its implications for health. Timestamps [01:37] Common claims and narratives [03:15] Historical context of dietary guidelines [21:57] Sugar industry influence on dietary research [36:17] The mcgovern report [40:49] Misconceptions about dietary guidelines [44:28] Changes in food supply and consumption [58:15] Critiques and conflicts of interest [01:06:47] Key ideas segment (Premium-only) Links & Resources Go to (with linked resources) Subscribe to Join the for free Do you want to be skilled in reading nutrition studies? Enroll in the next cohort of our course Alan Flanagan’s - latest training and nutrition research relevant to strength trainees is the best online database for looking at the evidence of diets, foods and supplements on a range of health outcomes.
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SNP41: Do Certain Foods Really Cause Inflammation – And Are Anti-Inflammatory Diets the Answer?
06/17/2025
SNP41: Do Certain Foods Really Cause Inflammation – And Are Anti-Inflammatory Diets the Answer?
Inflammation has become a nutrition buzzword, often used in extreme or misleading ways. This episode aims to clarify what inflammation is, how it relates to diet and health, and whether specific foods truly provoke inflammatory responses in the body. The episode provides a nuanced, evidence-based look at inflammation and diet. It explains the difference between acute and chronic inflammation, outlines the role of chronic low-grade inflammation in disease, and emphasizes that overall dietary patterns – rather than any single food – are what influence our inflammatory status. Commonly demonized foods (such as sugar, wheat, and dairy) are scrutinized, and the conversation debunks myths about them being uniformly “inflammatory.” In this episode, Danny takes a look at what the scientific evidence actually shows about anti-inflammatory diets. Note: This is a -exclusive episode. Timestamps 01:06 Understanding Inflammation: Basics and Biomarkers 04:02 Acute vs. Chronic Inflammation 14:21 Biomarkers of Inflammation 22:51 Dietary Patterns and Inflammation 34:53 Specific Foods and Nutrients Impacting Inflammation 47:01 Practical Takeaways for an Anti-Inflammatory Diet 51:30 Conclusion Related Resources Subscribe to Enroll in the next cohort of our course Related podcast episodes: Sigma Statement:
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#566: Can We Maintain Weight Loss? Pharmacology and Behavior – Tara Schmidt, RD
06/10/2025
#566: Can We Maintain Weight Loss? Pharmacology and Behavior – Tara Schmidt, RD
GLP-1 receptor agonists have changed the landscape of obesity treatment, offering levels of weight loss once thought unattainable without surgery. But what happens after the weight is lost? And can we really talk about success without talking about maintenance? While much of the public discourse fixates on dramatic weight loss numbers, the harder question is what comes next. Can lifestyle interventions alone sustain weight loss after GLP-1 cessation? How do metabolic adaptations and behavioral relapse factor in? And what does the data actually show about relapse rates, nutritional adequacy, and lean mass preservation when using these medications? In this episode, Danny sits down with Tara Schmidt, dietitian at the Mayo Clinic, to examine the intersection of pharmacology and behavior in long-term weight management. Tara Schmidt is a registered dietitian and an instructor of nutrition at Mayo Clinic. As the lead dietitian for the Mayo Clinic Diet, she provides guidance rooted in evidence-based principles. She hosts the Mayo Clinic On Nutrition podcast and co-authored The Mayo Clinic Diet: Weight Loss Medications Edition. Timestamps [05:17] Understanding weight loss maintenance [08:44] Defining success in weight loss maintenance [11:54] Predictors of maintenance: self-monitoring and behavioral strategies [23:37] Pharmacological interventions: GLP-1 receptor agonists [31:06] Dietary considerations for those taking GLP-1 RAs [37:07] Addressing misconceptions about weight loss drugs [42:48] Final thoughts and takeaways [48:49] Key ideas (Premium-only) Links/Resources Subscribe to Go to Join the for free Enroll in the next cohort of our course Visit
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#565: How Zinc Insufficiency Impacts Inflammation, Immunity & Aging – Prof. Emily Ho
06/03/2025
#565: How Zinc Insufficiency Impacts Inflammation, Immunity & Aging – Prof. Emily Ho
Zinc is an essential micronutrient that often flies under the radar, despite being vital for hundreds of enzymes and transcription factors involved in immunity, antioxidant defense, and DNA repair. A surprisingly large segment of the population may not get enough – an estimated 10% of U.S. individuals consume less than half the recommended zinc intake, putting them at risk of deficiency. In this episode, Prof. Emily Ho discusses how even mild zinc insufficiency can impair immune function, promote chronic inflammation, and accelerate aspects of aging. She delves into the concept of “inflammaging” – the chronic, low-grade inflammation that develops with age – and explains how inadequate zinc status can aggravate this process. The conversation also highlights emerging research on zinc’s role in DNA integrity and how restoring zinc levels can reverse certain damage, underscoring zinc’s broader significance in healthy aging and disease prevention. Overall, this episode provides a deep scientific look at why maintaining adequate zinc status is crucial for immune resilience and mitigating age-related inflammatory and oxidative damage. About the Guest Emily Ho, PhD is the Director of the Linus Pauling Institute and professor in the College of Health at Oregon State University. Her research focuses on understanding the mechanisms by which nutrient status and healthy foods affect the initiation and/or progression of chronic diseases such as cancer. Her work has helped drive dietary requirements and recommendations for micronutrients such as zinc for communities with susceptibility to poor nutrition. Timestamps [02:10] Interview begins [03:58] The roles of zinc [06:31] Zinc deficiency and insufficiency [14:26] Prevalence and risk factors of zinc deficiency [21:12] Zinc and age-related inflammation [29:39] Zinc’s impact on chronic diseases [31:20] Practical advice on zinc supplementation [41:14] Final thoughts Related Resources Go to (includes related research) Join the for free Subscribe to Enroll in the next cohort of our course
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#564: Is Protein’s Appetite-Suppressing Power Overstated?
05/27/2025
#564: Is Protein’s Appetite-Suppressing Power Overstated?
In this episode, we take a deep dive into the commonly held belief that protein is the most satiating macronutrient. It’s an idea that shows up frequently in both clinical guidance and popular nutrition discourse: if you want to feel fuller, eat more protein. But how robust is that claim when you drill into the details of the evidence? To explore this, Alan and Danny examine the complex interplay between protein intake, satiety, and energy intake. We look at both historical and recent literature, including work from Kevin Hall’s group, that raises important questions about how much of protein’s supposed appetite-suppressing effect is due to the protein itself versus other influential variables—such as eating rate, food texture, and energy density. This is an important topic, not just for academic curiosity, but for its practical implications. If our assumptions about protein and satiety are oversimplified or overstated, that has knock-on effects for how we design diets aimed at appetite regulation, weight management, or obesity prevention. So whether you’re a researcher, a clinician, or simply someone interested in understanding the mechanisms behind how we eat, this episode aims to provide clarity on where the science currently stands—and where it might be leading. Timestamps [03:18] The impact of protein on satiety [04:49] Historical context of protein and satiety [07:30] Mechanisms of protein-induced satiety [16:31] Research methods and measurements [21:39] Studies on protein and satiety [27:51] Analyzing specific studies [35:51] Understanding high protein meals and their effects [37:31] Acute vs. chronic effects of high protein intake [45:59] Other meal characteristics [53:21] Real-world implications of protein intake [01:01:19] Summarizing the impact of protein on satiety Related Resources Subscribe to Join the for free Enroll in the next cohort of our course Go to Related studies:
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#563: The Financialization of the Food System – Prof. Martin Caraher
05/20/2025
#563: The Financialization of the Food System – Prof. Martin Caraher
Global food systems have been increasingly subjected to financial speculation, leading to adverse consequences for growers, consumers, and public health. But what are the systemic vulnerabilities that impact food security, equitable access to nutritious food, and the broader socio-political frameworks influencing these outcomes? Understanding the financial mechanisms shaping food production and distribution is highly relevant for health professionals, policy makers, and researchers concerned with nutrition, equity, and global health systems. This episode urges a critical re-evaluation of current food policies and invites consideration of more ethical, resilient approaches to safeguarding food systems. Professor Martin Caraher is Emeritus Professor of Food and Health Policy at the Centre for Food Policy, City St. Georges, University of London. His research encompasses food poverty, food security, the role of food aid, and the broader implications of food systems on public health. Timestamps [01:12] Financialization of food: an overview [05:27] Speculation and its impact on food prices [13:10] Global food security and policy responses [17:20] Corporate concentration in food systems [34:03] Potential solutions and future directions Related Resources Go to Join the for free Subscribe to Enroll in the next cohort of our course Episode #344: X: and
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SNP40: Do Seed Oils Cause Inflammation & Chronic Disease?
05/13/2025
SNP40: Do Seed Oils Cause Inflammation & Chronic Disease?
Seed oils have recently become a hotly debated topic in nutrition, fueled by sensational claims on social media. In this episode, the central theme is examining whether seed oils are truly harmful or if they’ve been unjustly demonized. The discussion tackles prevalent claims – that seed oils drive inflammation, oxidation, and chronic disease – and compares them against the current scientific evidence. This is highly relevant to nutrition science and clinical practice today, as many patients and practitioners are encountering conflicting information about vegetable oils. By exploring the origins of seed oils, their biochemical effects, health outcome data, and the misinformation ecosystem, the episode aims to clarify how omega-6 rich seed oils fit into a healthy diet and what evidence-based guidelines say. Timestamps 01:00 Understanding terms: PUFA, Linoleic Acid, Omega-6 05:20 Do seed oils cause inflammation? 12:44 Omega-3 and omega-6 16:43 Inflammatory markers and linoleic acid 19:22 Oxidation and cooking oils 26:25 Refining processes and health concerns 30:32 Health outcomes and polyunsaturated fats 35:18 Evidence cited by anti-seed oil proponents 43:48 Conclusions Related Resources Join the for free Subscribe to Enroll in the next cohort of our course Sigma Statement: Related podcast episodes:
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#562: How to Detoxify Yourself – Quack Asylum Special
05/06/2025
#562: How to Detoxify Yourself – Quack Asylum Special
In this Quack Asylum episode, Danny and Alan critically examine the claims surrounding “detoxification protocols” – specialized diets, cleanses, or supplements marketed to eliminate toxins from the body for better health. The central theme is whether these detox plans actually improve health outcomes or if they’re built on pseudoscience and fear. Many alternative health proponents argue that modern life exposes us to countless toxins that accumulate in our bodies, causing chronic diseases, and thus we must undergo periodic detox regimens to cleanse ourselves. There is genuine concern about environmental pollutants and chemicals – indeed, numerous substances in our food, water, and air can be harmful at sufficient doses. Nutritional science also recognizes that certain nutrients (e.g. vitamins, antioxidants) play roles in the body’s natural detox pathways. However, there’s a large gap between acknowledging real toxic exposures versus endorsing commercial “detox” diets or products. Many people, including health professionals, encounter patients or clients interested in detox plans, so understanding the science (or lack thereof) behind these claims is important. Timestamps [03:20] Claim 1 – Mark Hyman [06:10] The purpose of today’s episode [08:22] Claim 2 – Chris Kresser [11:30] Detoxification Pathways in the Body [25:46] Glutathione, heavy metals and other nutrients [50:30] Do nutrients support detox pathways [55:20] Unhinged claims: Mold and mycotoxin toxicity [01:04:54] One more unhinged claim [01:09:10] Conclusions Related Resources Subscribe to Join the for free Go to Enroll in the next cohort of our course
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#561: Emulsifiers in the Modern Diet: Health Risk or Harmless Additive?
04/29/2025
#561: Emulsifiers in the Modern Diet: Health Risk or Harmless Additive?
Emulsifiers are a ubiquitous component of the modern food supply, found in everything from salad dressings and dairy products to pastries and sauces. Traditionally regarded as safe by regulatory agencies, emulsifiers play a vital role in enhancing the texture, stability, and shelf-life of countless processed foods. Yet, in recent years, emerging research has prompted a reevaluation of this assumption, raising intriguing questions about whether regular consumption of these additives might have previously overlooked health consequences. Recent epidemiological studies have suggested possible associations between higher emulsifier intake and chronic health issues. Concurrently, mechanistic research has provided some biological pathways through which emulsifiers could disrupt gut health. This episode aims to critically examine the scientific literature surrounding dietary emulsifiers, differentiating credible evidence from speculation, and outlining what can—and cannot—be concluded about their potential risks. Timestamps [01:18] Emulsifiers in food: definition, function, and common uses [05:15] Regulatory approval and traditional safety evaluations [09:32] Epidemiological studies on emulsifiers: nutriNet-santé cohort [14:55] Emulsifiers and cardiovascular disease risk [26:12] Emulsifiers and type 2 diabetes risk [30:01] Emulsifiers and cancer risk [35:05] Mechanistic insights: emulsifiers, gut health, and inflammatory bowel disease (IBD) [47:15] Practical recommendations and clinical implications Related Resources Subscribe to Go to (with study links) Join the for free Enroll in the next cohort of our course
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#560: Neurodiversity & Nutrition: Choline, ADHD, Dyslexia, and Beyond – Emma Derbyshire, PhD
04/22/2025
#560: Neurodiversity & Nutrition: Choline, ADHD, Dyslexia, and Beyond – Emma Derbyshire, PhD
Nutrition is increasingly being considered as a modifiable factor that may influence neurodevelopmental outcomes. While severe deficiencies in certain nutrients are known to have dramatic effects, there is growing interest in the potential impact of more subtle insufficiencies — particularly during critical windows such as pregnancy, infancy, and early childhood. In conditions like ADHD, dyslexia, and autism spectrum condition (ASC), questions have been raised around whether specific nutrients may play a role in cognitive performance, attention, or learning. Could low choline intake be a contributing factor to altered brain function? Are individuals with neurodevelopmental conditions more likely to have different nutrient needs or metabolic profiles? And how might practical dietary strategies fit into a broader management approach? In this episode, Dr. Emma Derbyshire discusses the evidence on choline and other brain-related nutrients in the context of neurodiversity. Timestamps [02:02] Guest background [05:38] Choline: what it is and why it matters [07:26] Research challenges: measuring choline and study design issues [10:49] Maternal intake: choline’s role in fetal brain development [14:24] Choline & neurodevelopmental disorders (ADHD, ASC, dyslexia) [17:14] The choline gap: intake vs. requirements [23:05] Supplementation: adequacy vs. excess and safety concerns [25:05] Food sources: choline in the diet & intake planning [30:14] Nutrition as a tool in ADHD and dyslexia management [38:45] Other key nutrients (omega-3s, iron, iodine, magnesium, water) Related Resources Go to Join the for free Subscribe to Enroll in the next cohort of our course Book: Dr. Derbyshire’s website:
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