Sigma Nutrition Radio

Danny Lennon

Nutrition Science

Cardiovascular Disease

Nutrition

Ultra-Processed Foods

Public Health

Cholesterol

Sports Nutrition

Cardiovascular Health

Obesity

Performance Nutrition

Gut Microbiome

Mental Health

Chronic Diseases

Eating Disorders

Dietary Fiber

Omega-3 Fatty Acids

Nutrition Research

Mediterranean Diet

Dietary Patterns

Inflammation

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.

1.4k ratings

Publishes	Weekly	Episodes	650	Founded	13 years ago
Number of Listeners		Categories	NutritionHealth & Fitness

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Guests Host Reviews Charts Talking Points

Latest Episodes

#626: Practical Diet Considerations for Healthy Aging - Prof. Charlyn Black

Living longer does not necessarily mean spending more years in good health. But how much of the decline we associate with aging is inevitable, and how much reflects disease, inactivity, and other potentially modifiable factors

Nutrition presents a... more

Yesterday • 36 min

Can Micronutrient Supplements Help With Anxiety, Depression & Emotional Regulation? (SNP55)

Can broad-spectrum vitamin and mineral supplements improve anxiety, depression or emotional regulation?

In this Premium-exclusive episode, we examine three randomised, placebo-controlled trials from Professor Julia Rucklidge's research group: NoMA... more

3 Nov 2026 • 17 min • Most popular

#625: Does Changing the Microbiome Actually Improve Health? – Prof. Harry Sokol

Claims about "improving the gut microbiome" are widespread, but what would improvement actually mean? How do we establish which microbial changes contribute to disease, and which simply reflect it?

Research on bacterial metabolism of medications ra... more

27 Oct 2026 • 46 min • Popular

#624: Can Athletes Eat for Performance and the Planet? – Peter Res

Can an athlete reduce the environmental impact of their diet while still meeting the demands of training, competition and recovery? Peter Res argues that these aims can be compatible, provided dietary changes are planned around the athlete's needs.

20 Oct 2026 • 36 min

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Recent Guests

Harry Sokol

Gastroenterologist and researcher specializing in inflammatory bowel disease and gut microbiota

Sorbonne University

Episode: #625: Does Changing the Microbiome Actually Improve Health? – Prof. Harry Sokol

Peter Res

Sports performance nutritionist with experience in professional cycling, football, Olympic sport and speed skating.

Episode: #624: Can Athletes Eat for Performance and the Planet? – Peter Res

Austin Baraki

Internal medicine physician and clinician educator working in hospital medicine, weight management and performance.

Barbell Medicine

Episode: #623: Testosterone Testing: What Do the Results Mean? When Does TRT Help? – Austin Baraki, MD

Grant Tinsley

Professor of Human Performance at Texas Tech University, Director of the Energy Balance and Body Composition Lab

Texas Tech University; Vineyard Health (Chief Science Officer)

Episode: #622: Body Composition Testing: Methods & Interpretation – Prof. Grant Tinsley

Graham Finlayson

Professor of Psychobiology, University of Leeds

University of Leeds

Episode: #621: Hedonic Overeating, Food Wanting and Impact of Perception – Prof. Graham Finlayson

Jordan Feigenbaum

Founder of Barbell Medicine

Barbell Medicine

Episode: #620: BPC-157 and Peptide Medications: What Do We Know? – Jordan Feigenbaum, MD

Nick Tiller

Exercise science researcher and science communication advocate

The Health and Wellness Lie author, nbTiller.com

Episode: #618: How Wellness & Optimisation Culture Can Commodify Science – Nick Tiller, PhD

Gemma McGuinness

Performance nutritionist, co-founder of Verus Performance

Verus Performance

Episode: #617: What Does Effective Athlete Support Look Like in Practice? – Gemma McGuinness

Austin Baraki, MD

Physician, co-founder of Barbell Medicine

Barbell Medicine

Episode: #616: More Testing, Better Health? Harms of Overdiagnosis & Overtreatment - Austin Baraki, MD

Host

Danny Lennon

Host of Sigma Nutrition Radio

Reviews

4.9 out of 5 stars from 1.4k ratings

Great speakers but lack scientific humility
Great discussions from leading experts but sadly fail to demonstrate the humility needed as true scientists. The scientific method requires constant evaluation and at any time will be only partially “correct” representation of the truth.. They weaken their stance by suggesting they are the only source of truth, whilst failing to understand the wider role of food in people’s lives.
Apple Podcasts
2
MedicalPodder
United Kingdoma year ago
Mmm
I have not lissoned to this so bast on the reviews
Apple Podcasts
4
Uam a monkey
United Kingdoma year ago
Reliable + Evidence Based
Evidence based, nuanced, no hype. Expert interviews, deep dives, detailed and clear explanations. My go-to source for all nutrition questions. Having listened to well over 100 episodes, Sigma has easily become my favorite podcast. Danny is an exceptional interviewer, and he and Alan have a talent for cutting through the confusion to tease out what the science really shows (and how/why). I’ve grown in careful, critical thinking in all spheres of life. Highly recommend.
Apple Podcasts
5
JJSchroeder
United Statesa year ago
👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲
👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲👩🏻‍🦲💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💅🏼💴💴💴💴💴💴💴💴💴💴💴💴💴💴🏆🏆🏆🏆🏆🏆👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻✌🏻✌🏻✌🏻✌🏻✌🏻✌🏻✌🏻✌🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👏🏻
Apple Podcasts
5
#DowntonAbbeyfan!
United Kingdoma year ago
Low Carb Denialists
Flanagan has a blind hatred of people who regain their health an quality of life by adopting a low carb diet.
Apple Podcasts
1
Combination Lock
Australia2 years ago

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Listeners Say

Key themes from listener reviews, highlighting what works and what could be improved about the show.

Many say it helps develop careful, critical thinking about nutrition claims.

Listeners praise evidence-based rigor and guests' expertise.

Some criticisms note the hosts' perceived arrogance or certainty at times.

Listeners frequently value practical, research-informed coaching insights.

Premium content and thorough study explanations are appreciated by long-time fans.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Apple Podcasts	#43	United States/Health & Fitness/Nutrition
Apple Podcasts	#11	United Kingdom/Health & Fitness/Nutrition
Apple Podcasts	#40	Canada/Health & Fitness/Nutrition
Apple Podcasts	#196	United Kingdom/Health & Fitness
Apple Podcasts	#23	Italy/Health & Fitness/Nutrition
Apple Podcasts	#29	Australia/Health & Fitness/Nutrition

Talking Points

Recent interactions between the hosts and their guests.

#625: Does Changing the Microbiome Actually Improve Health? – Prof. Harry Sokol

Q: When it comes to microbiome testing, at least as it's available right now, do you see much in the way of clinical utility that would go beyond what we would otherwise be recommending from, let's say, a dietary perspective or otherwise a clinical perspective?

Sokol says current commercial tests are not clinically useful because results are poorly reproducible, there is no clear standard for interpreting normal and abnormal microbiomes, and broad tests do not answer specific clinical questions.

#625: Does Changing the Microbiome Actually Improve Health? – Prof. Harry Sokol

Q: Can you maybe explain the things that people might need to be on the lookout for, and how we need to be careful in maybe some of the interpretations we see of that type of associational work that shows differences at that type of level, and maybe a difference in an outcome like a disease, and what we really need to do to understand, are these microbial differences driving that disease or not?

Differences between healthy people and patients may reflect the disease rather than contribute to it. Animal transfer studies can provide evidence, but human interventions that change the microbiome and measure disease outcomes are needed to establish its role.

#624: Can Athletes Eat for Performance and the Planet? – Peter Res

Q: What are some of the initial small first steps people could try to make their diets more sustainable?

Res recommends choosing a few recipes that do not contain animal products, such as chickpea curry or a dish with maize and beans, and replacing one or two familiar meals, especially beef meals, with pulses or lentils.

#624: Can Athletes Eat for Performance and the Planet? – Peter Res

Q: What are some of the principal fears that stop athletes or nutritionists from moving toward more sustainable diets?

Res says protein is the main concern, particularly whether plant foods provide enough protein and whether plant protein is inferior. He explains that adequate energy intake, sufficient protein per meal and combining plant sources can address these concerns, though plant-based diets may require a greater volume of food.

#623: Testosterone Testing: What Do the Results Mean? When Does TRT Help? – Austin Baraki, MD

Q: What are some examples of cases where based on a patient profile, what they're reporting, some of their symptoms where it would be indicated or something that you would go and check would be to order a testosterone lab for them?

Baraki distinguishes specific signs such as incomplete sexual development, loss of body hair or small testicular volume from nonspecific symptoms such as fatigue and low mood. Changes in libido or erectile function, infertility, gynecomastia, hot flashes and low bone density can also prompt testing, with other possible causes considered.

Audience Metrics

Listeners, social reach, demographics and more for this podcast.

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Frequently Asked Questions About Sigma Nutrition Radio

What is Sigma Nutrition Radio about and what kind of topics does it cover?

A rigorous, evidence-centered show that unpacks nutrition science through in-depth conversations with researchers, clinicians, and practitioners. Episodes routinely explore how to interpret research, distinguish hype from data, and apply nuanced findings to real-world eating, coaching, and health decisions. A hallmark is critical thinking about methods, with guests ranging from meta-analysts and pharmacists to sport-nutrition experts and public-health researchers, often tying complex topics like fasting, plant-based diets, microbiome science, and nutrition messaging to practical guidance for professionals and informed listeners alike.

Where can I find podcast stats for Sigma Nutrition Radio?

Rephonic provides a wide range of podcast stats for Sigma Nutrition Radio. We scanned the web and collated all of the information that we could find in our comprehensive podcast database. See how many people listen to Sigma Nutrition Radio and access YouTube viewership numbers, download stats, audience demographics, chart rankings, ratings, reviews and more.

How many listeners does Sigma Nutrition Radio get?

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What are the audience demographics for Sigma Nutrition Radio?

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How many subscribers and views does Sigma Nutrition Radio have?

To see how many followers or subscribers Sigma Nutrition Radio has on Spotify and other platforms such as Castbox and Podcast Addict, simply upgrade your account. You'll also find viewership figures for their YouTube channel if they have one.

Which podcasts are similar to Sigma Nutrition Radio?

These podcasts share a similar audience with Sigma Nutrition Radio:

1. Iron Culture presented by MASS
2. The Proof with Simon Hill
3. Front Page Fitness
4. Barbell Medicine Podcast
5. The Revive Stronger Podcast

How many episodes of Sigma Nutrition Radio are there?

Sigma Nutrition Radio launched 13 years ago and published 650 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

How do I contact Sigma Nutrition Radio?

Our systems regularly scour the web to find email addresses and social media links for this podcast. We scanned the web and collated all of the contact information that we could find in our podcast database. But in the unlikely event that you can't find what you're looking for, our concierge service lets you request our research team to source better contacts for you.

Where can I see ratings and reviews for Sigma Nutrition Radio?

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What guests have appeared on Sigma Nutrition Radio?

Recent guests on Sigma Nutrition Radio include:

1. Harry Sokol
2. Peter Res
3. Austin Baraki
4. Grant Tinsley
5. Graham Finlayson
6. Jordan Feigenbaum
7. Nick Tiller
8. Gemma McGuinness

To view more recent guests and their details, simply upgrade your Rephonic account. You'll also get access to a typical guest profile to help you decide if the show is worth pitching.

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