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PODCAST

Sigma Nutrition Radio

Discussions about the science of nutrition, dietetics and health. The podcast that educates through nuanced conversations, exploring evidence and cultivating critical thinking. Hosted by Danny Lennon.

health & fitness nutrition

All Episodes

59:07

#432: Bill Harris, PhD - Omega-3 Fatty Acids & Health

Sigma Nutrition Radio ·

2022/03/30

Omega-3 fatty acids have long been associated with various health outcomes. A type of omega-3 called alpha-linolenic acid (ALA) is found in various plant foods such as flax seeds or chia seeds. Other omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are found typically in marine food sources such as oily fish (e.g. salmon, mackerel) and algae. And while higher intakes of such foods have shown benefit, there has been some confusion over the benefit of such nutrients due

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01:24:26

#431: Artificial Sweeteners - Health Impacts and...

Sigma Nutrition Radio ·

2022/03/24

There is now widespread use of various "artificial sweeteners" in foods and beverages. Most commonly non-nutritive sweeteners are used to sweeten a products, whilst having less sugar and calories than a traditionally sugar-sweetened version of that product. For example, diet drinks (e.g. diet soda) are most commonly associated with artificial sweeteners. However, they are also in a wide variety of food products and supplements. For a long-time there has been skepticism and alarm raised about their

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21:19

SNP1: "Don’t Eat Vegetables" [Preview]

Sigma Nutrition Radio ·

2022/03/17

In this Premium episode Alan and Danny aim to address the idea that you shouldn’t eat vegetables, or that they aren’t beneficial. Two related ideas have been circulated in some nutrition/health communities on the internet: Vegetables aren’t beneficial for health (or that there is no health benefit to high vegetable intake). Vegetables are actually detrimental to health, and their removal improves health. Such advice is usually defended through some combination of the following claims, which we

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01:20:15

#430: Soy - Yes, No, Maybe?

Sigma Nutrition Radio ·

2022/03/14

Click here to subscribe to Sigma Nutrition Premium The popularity of soy foods and soy-based products has been increasing in recent times. This has been particularly the case as a dairy alternative, with people switching to using soy ‘milk’ and soy-based yogurts and cheese. Additionally, soy has become popular as a meat alternative in a variety of dishes for those looking to reduce meat intake. Soy foods such as tofu can be used in recipes in place of meat, and soy-based ‘meat alternatives’ that are

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01:46:40

#429: Kevin Hall, PhD & Stephan Guyenet, PhD -...

Sigma Nutrition Radio ·

2022/03/08

Click here to subscribe to Premium The pathogenesis of obesity is clearly complex. And the need to have a comprehensive model to explain this pathogenesis is important. One such model, termed the Energy Balance Model, has largely been the consensus paradigm of obesity scientists to this point. Specifically, a recently published paper in the American Journal of Clinical Nutrition by Dr. Kevin Hall and his colleagues outlined the various nuances of the model, as well as common misconceptions about

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01:28:37

#428: Food Environments

Sigma Nutrition Radio ·

2022/03/02

Click here to subscribe to Sigma Nutrition Premium Clearly the food choices one makes over time directly impacts health. However, choices are not made in a vacuum; that is, they are not always concious decisions made for rational reasons based on free will. Rather, the choices we make about food are shaped by the contexts within which they are made. The term "food environment" is used to describe the physical, economic, political and socio-cultural contexts in which choices are made about acquiring,

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27:52

Can You ‘Study’ Nutrition Science with a Podcast?...

Sigma Nutrition Radio ·

2022/02/28

Subscribe to Sigma Nutrition Premium: https://sigmanutrition.com/premium/ You love listening to, and learning from, nutrition podcasts. Sigma Nutrition Premium allows you to more effectively do that. Understand topics more deeply Retain more of what you hear Recall specific details long after listening Study nutrition science in an enjoyable way As a Premium subscriber you get exclusive access to: Detailed Study Notes ‘Key Ideas’ Segments Hand-crafted Transcripts Premium-only Episodes Subscribe

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01:03:09

#427: Jacob Schepis – Evidence-Based Coaching:...

Sigma Nutrition Radio ·

2022/02/22

Subscribe to Sigma Nutrition Premium It's never been more popular to be seen as "evidence-based" as a fitness professional. And indeed evidence-based practice has been seen as the best way to arrive at coaching decisions. But is "evidence-based practice" actually what fitness professionals are doing? Is it even attainable for most coaches? Does it create a burden on them? Does it even matter if you're actually reading reserach or not? What makes for a competent personal trainer? In this episode,

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53:57

#426: Jaebian Rosario – How Social Identity and...

Sigma Nutrition Radio ·

2022/02/15

Subscribe to Sigma Nutrition Premium Jaebien Rosario is currently a graduate level student in public health at East Stroudsburg University. He has degrees in psychology and philosophy, and has previously worked as a personal trainer and nutrition coach. His interest include science denialism, vaccine hesitancy, the philosophy of science, the sociology of science, and meta science. His current research projects include research proposals for covid-19 and vitamin D trials, research conducted

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01:00:18

#425: Prof. Anna Krylov – When Ideology Hurts...

Sigma Nutrition Radio ·

2022/02/08

Subscribe to Sigma Nutrition Premium Prof. Anna Krylov is a Professor of Chemistry at the University of Southern California (USC), working in the field of theoretical and computational quantum chemistry. She has a M.Sc. in Chemistry from Moscow State University (1990) and a PhD from The Hebrew University of Jerusalem, Israel (1996). Krylov is active in the promotion of gender equality in STEM fields, especially in theoretical chemistry. She created the web directory 'Women in Theoretical and

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01:31:12

#424: Is Low Cholesterol Bad For You?!

Sigma Nutrition Radio ·

2022/02/01

In this episode Alan and Danny discuss the role of cholesterol in the body and claims that are made suggesting low levels of blood cholesterol are harmful to health. Starting with the premise that cholesterol is an important molecule in the body and plays a role in many processes, discussed are two related claims: we should avoid low cholesterol levels as it can harm our health elevated levels of cholesterol may actually be protective against disease or mortality. The episode also critiques claims

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36:25

#423: Zoya Huschtscha, PhD – Understanding Sarcopenia...

Sigma Nutrition Radio ·

2022/01/25

Zoya Huschtscha, PhD is a researcher and assistant lecturer at Monash University (Australia), in the Department of Nutrition and Dietetics. She completed her PhD at the same institution, where her research focused on interventions to prevent and treat sarcopenia; i.e. the loss of muscle function and mass, typically with age. Zoya also has a Masters of Dietetics. In addition to her academic work, she works in private practice as a sports dietitian. Show notes available at

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01:04:09

#422: Psychobiotics – Can Probiotics Improve...

Sigma Nutrition Radio ·

2022/01/18

In this episode the Sigma team discuss the research looking at psychobiotics, i.e. probiotics that have health impacts on those with pyschiatric disorders or symptoms. They discuss the origins of the research, the gut-brain axis, mechanisms by which gut microbiota could impact mood, and then the human trials to date that have examined probiotics' effects on mood, anxiety, depression, bipolar disorder and other outcomes. Show notes can be found at sigmanutrition.com/episode422/ and the Sigma

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01:00:43

#421: Brendon Stubbs, PhD – The Research on...

Sigma Nutrition Radio ·

2022/01/11

Dr. Brendon Stubbs, PhD, is a Senior Clinical Lecturer and researcher at King's College London, conducting research in physical activity & mental health, the mind-body interface, and meta-research. He has published over 600 academic papers in several leading journals across multiple scientific fields. He has informed policy guidelines in the UK, Europe and the World Health Organization. Dr. Stubbs is also a clinical physiotherapist, being Head of Physiotherapy at the South London and Maudsley NHS

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01:21:02

#420: Cannabis – Kevin Boehnke, PhD & Carrie Cuttler,...

Sigma Nutrition Radio ·

2022/01/04

Kevin Boehnke is a researcher at the University of Michigan, in the Chronic Pain and Fatigue Research Center. His current research focuses on therapeutic applications of illicit or semi-licit substances (cannabis, psychedelics). His goal is to rigorously assess appropriate use of these substances and to help address the public health harms caused by their criminalization. Carrie Cuttler is an Assistant Professor at Washington State University. Her research at the Health and Cognition Laboratory

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39:21

#419: Nathan Bryan, PhD – Role of Nitric Oxide in...

Sigma Nutrition Radio ·

2021/12/30

Dr. Nathan Bryan, PhD is an Adjunct Assistant Professor at Baylor College of Medicine. Dr. Bryan has been involved in nitric oxide research for the past 18 years and has made many seminal discoveries in the field. He was the first to demonstrate and discover an endocrine function of nitric oxide via the formation of S-nitrosoglutathione and inorganic nitrite. Dr. Bryan obtained his doctoral degree from Louisiana State University School of Medicine in Shreveport where he was the recipient of the

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01:17:44

#418: Should We Consume a Direct Source of DHA?

Sigma Nutrition Radio ·

2021/12/21

Click here to subscribe to Sigma Nutrition Premium In this episode Danny and Alan discuss the debate around whether a direct source of the long-chain omega-3 fatty acid DHA should be recommended. Many people do not consume the marine foods (primarily fatty fish) that contain DHA, and higher DHA intakes, DHA status, and omega-3 indices are predictive of certain health outcomes. But the essential omega-3 fatty acid alpha-linolenic acid (ALA) can be consumed from plant sources. So do those who do not

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01:03:25

#417: Austin Baraki, MD – What Do Nutrient Blood...

Sigma Nutrition Radio ·

2021/12/14

Dr. Austin Baraki joins Danny and Alan to critically evaluate the assumption that blood levels of a nutrient directly tell us about overall nutritional status. With many people getting blood tests done outside of clinical settings, there is significant risk of misinterpretation of what these measures mean. In this episode we discuss measures of calcium, sodium, vitamin D and others as examples of where misinterpretation and misunderstanding can happen. Show notes can be found at

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48:40

#416: David Nunan, PhD – Evidence-Informed Health...

Sigma Nutrition Radio ·

2021/12/07

Dr. David Nunan, PhD is a Lecturer and Senior Research Fellow in the Centre for Evidence-Based Medicine at the University of Oxford. There, he is the Director of the Postgraduate Certificate in 'Teaching Evidence-Based Health Care' and the lead tutor for the internationally-renowned 'Teaching Evidence-Based Medicine' course. He is a principal investigator with research interests in prevention and treatment of lifestyle-related conditions, improving the understanding and use of research evidence, and

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46:24

#415: Prof. Bruce Neal – Can Salt Substitutes Reduce...

Sigma Nutrition Radio ·

2021/11/30

Bruce Neal is Executive Director at The George Institute for Global Health Australia; and Professor of Medicine, UNSW Sydney. Prof Neal is a UK-trained physician who has 25 years’ experience in clinical, epidemiological, and public health research with a focus on heart disease, stroke and diabetes. Bruce has a longstanding interest in high blood pressure and diabetes and the potential for both clinical interventions and changes in the food supply to deliver health gains. His work has been

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