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Nutrition · Danny Lennon

Sigma Nutrition Radio

by Danny Lennon

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.

Latest episodes

Showing 20 · updated from the feed

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

Commonly people are talking about "peptides" to refer to a heterogeneous group of peptide medications or investigational compounds. These are increasingly promoted for in

Sep 15
57 min

#619: How Much Fish Should a Healthy Diet Contain?

Most dietary guidelines recommend eating one to two servings of fish per week, often specifying that at least one serving should be oily fish. But how directly is that re

Sep 8
1 h 03 min

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

Wellness and optimisation culture increasingly presents itself as "science-based". But citing studies, using technical language, or having scientific credentials does not

Sep 1
56 min

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

Effective athlete support requires more than delivering technically correct nutrition advice. It depends on understanding the athlete's wider environment, anticipating th

Aug 25
46 min

Fiber: Independent Benefits or Just a Proxy for Healthy Foods?

This episode answers one of the questions raised in the most recent Q&A episode on Sigma Nutrition Premium.  The full episode includes the following questions: Fiber:

Aug 18
21 min

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

Medical screening is often framed as an uncomplicated good: if disease is found earlier, treatment can begin earlier and outcomes should improve. This episode examines

Aug 11
1 h 15 min

#615: Why Processing Doesn't Determine the Healthfulness of Plant-Based Diets – Alysha Thompson, PhD

What does the evidence actually show when we look at plant-based dietary patterns through the lens of food processing? And does classifying foods as "ultra-processed" mea

Aug 4
56 min

#614: The Human Skills of Nutrition Coaching – Krista Scott-Dixon, PhD

In nutrition and health coaching, one of the central challenges is understanding how people actually change, particularly when life is complex, motivation fluctuates, and

Jul 21
56 min

#613: Supplement Safety & Medication Interactions – Giulia Guerrini, MPharm

Supplement safety is often discussed in very general terms, but in practice the risks depend heavily on the individual. A supplement that is reasonable for one person may

Jul 14
57 min

#612: Does Sweet Taste Exposure Actually Develop Preference? – Prof. Katherine Appleton

A common idea is that repeated exposure to sweet taste strengthens our preference for sweetness, which then drives greater intake of sweet foods and drinks. This idea is

Jul 7
38 min

#611: Electrolyte Mythology: Wellness Marketing vs. Evidence - Zoë Rom & Kylee Van Horn

Electrolytes have become one of the most heavily marketed areas of modern sports nutrition and wellness. What was once a relatively specific tool for certain endurance at

Jun 30
55 min

SNP51: Understanding Blood Glucose Reponses

This is a Premium-exclusive episode. Go to the Premium feed to listen. Or subscribe to Premium. Blood glucose is easy to measure, but not always easy to interpret. This

Jun 23
13 min

#610: Rock, Paper, Salmon – Errors in Interpreting Food Substitution Models

When considering the health impact of foods, it is important to consider "compared to what?". Increasing the amount of a certain food or nutrient in the diet, typically i

Jun 16
57 min

#609: Unprocessed Red Meat & Cancer Risk

Unprocessed red meat and cancer risk remains one of the most debated topics in nutrition science, partly because the evidence is often presented in overly simplistic term

Jun 9
1 h 09 min

#608: Performance Nutrition in Elite Rugby – James Morehen, PhD

Performance nutrition in elite sport is often discussed in terms of meal plans, supplements, and macronutrient targets. However, effective practice in professional enviro

Jun 2
1 h 08 min

#607: Gut Health & Microbiome Testing: What Evidence Do We Actually Have? – Emily Leeming, PhD

Gut health has become a major focus in nutrition, medicine, and consumer wellness, but the term is often used loosely. Claims about microbiome testing, probiotics, fermen

May 26
50 min

PMOS (PCOS) and Diet: What Can Nutrition Realistically Do? - SNP#50

In this episode, we examine what nutrition can realistically do in the condition historically known as PCOS, now renamed polyendocrine metabolic ovarian syndrome, or PMOS

May 21
19 min

#606: Practical Nutrition Strategies for Fat Loss – Luke Hanna

Body composition goals, particularly bodyfat loss, are among the most common reasons people seek support from a nutritionist or health and fitness professional. While the

May 19
41 min

#605: Fasting, Nutrient Timing & CGMs: Interpreting the Evidence – Prof. James Betts

Fasting, nutrient timing, chrono-nutrition, and continuous glucose monitoring are all topics that have generated substantial interest, but they are also areas where exagg

May 12
56 min

#604: How To Interpret Nutrition Research – David Allison, PhD

How should we decide what counts as trustworthy evidence? Scientific rigor is not a single characteristic of a study, but a chain of decisions made from the moment a ques

May 5
52 min

Chart trend

Position in the Nutrition chart (US), last 90 days.

#37
all-time peak
27
days in the top 50 since Nov 2024

Chart positions

Where Sigma Nutrition Radio ranks today in each Apple Podcasts chart (US, Sep 17, 2026).

#46 ▲ 1 Nutrition US

What listeners say

A curated, balanced selection of Apple Podcasts reviews.

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.

JJSchroeder · Jun 2025

As a PhD and Registered Dietitian I really appreciate the quality, thoroughness, and objectivity of Sigma Nutrition Radio. In a sea of sensationalism, clickbait and misinformation, SNR is a breath of fresh air. Danny and Alan are very thorough and do an excellent job of explaining studies and summarizing key points. They don’t push their personal agenda and have achieved a true evidence-based podcast. I can’t recommend this podcast enough.

Sailing through motherhood · Aug 2023

Really informative. I learned a lot. Not dogmatic. I am based in the US and like that Sigma Nutrition is based across the pond, which provides a different perspective.

Yropez · Dec 2021

This is the only podcast to get the most and latest nutrition education for everyone. It does focus on athletic performance based nutrition but pertinent information for everyone interested in the evidence based nutrition practices. Danny is so knowledgeable and prepared when he interviews his guests. Often times the guests comment on his great questions and how knowledgeable he is on the topics being covered. Highly, highly recommend this podcast.

Annemn12 · Sep 2021

I use to find the podcast interesting and informative but have since parted ways due to the high level of arrogance. Episode 400 is a great example of this. The hosts seemingly cherry picked controversial statements made by the “quacks” and then proceeded to mock them based on little supporting evidence. I had never heard of the quacks mentioned so I have no skin in the game, but I found the ad hominem attacks off putting and unhelpful in communicating why I should think of these people as quacks

Jim_reviews · Dec 2022

When I first saw the title of episode #336 Ethics of Veganism and Omnivorism, I was very excited for some deep discussion, especially since the guest is a philosophy professor at Princeton, and because I do not think factory farming is morally right. However, after listening to the episode, I was left disappointed to hear that a supposedly highly educated professor of philosophy presents the same basic arguments made by many misinformed online diet zealots. At one point, he presents the idea that holistically raised animals that are killed in middle age somehow increases suffering. This insinuates that a longer lifespan decreases suffering. This is a false claim, since longer lifespans, for both humans and animals, do not equate to less suffering. Simply explore the long life span, yet increased prevalence of chronic disease of later life common in the US population. Why is it that Danny and his guest are quick to attack the industrial animal industry, yet not once do they mention the equally unsustainable, unhealthy model of monocrop agriculture industry. A second point the host and guest seem to completely avoid is the fact that organisms across the animal AND plant kingdoms are sentient, on a relative scale. True, that a ruminant animal has a much more complex nervous system then a cabbage leaf, but not once is this talked about. They don’t challenge the idea that plants can also “feel” and are therefore, capable of some degree of suffering. The argument never dives into the moral dilemma that life eats life. A true philosophical exploration into a fundamental conundrum such as this would have been worth discussing. The philosophy professor really shows his true bias when he cites one study that athletes don’t need protein from animal sources for adequate nutrition. While this is acceptable, this argument on nutrition does not belong in an ethical debate. Why is a philosophy professor even presenting nutritional scientific information? It’s almost as if he is trying to prop up the superficiality of his ethical arguments with a single, arbitrarily chosen study. There should have been more talk on how we define animal/plant suffering from a neurophysiological standpoint and it’s considerations in food choices (some marine bivalves have been shown to have less complex nervous systems than plants, possibly challenging the professor’s entire argument on which causes more suffering, eating plants or animals). Not only that, but does the killing and suffering of countless gophers, moles, rabbits, insects, and bugs as a cost of crop harvesting, outweigh the killing of a single beef cattle that can feed 2-3 people for a year? Lastly, the professor makes the claim that we should avoid eating animals because, as I prosperous society, we have the ability to eat a vegan diet, unlike many tribes around the world. This is an arrogant statement that seemingly borders on making the claim that the westernized world is superior to these “meat-eating” cultures. A thoughtful professor would address the fact that for the entire 1.3 million years as Homo sapiens, no anthropologist has found a purely vegan culture throughout history. Does this make modern day humans morally superior to those in the past? This type of thinking seems to be so pervasive in many important discussions today, but it especially runs unchecked in our university systems in the US. I propose a debate format next attempt. When we start out with a predetermined conclusion presented by an obviously biased viewpoint, it doesn’t help anyone. Debate is a critical way, if not the most critical way, we can advance important ideas like these. Thank you to Danny for attempting to cover this topic. We need more discourse in this arena.

Matty mikey · Aug 2020

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