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Introduction
“The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know, our knowledge of our ignorance. For this, indeed, is the main source of our ignorance — the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.” – Karl Popper
To mark Sigma Nutrition’s milestone 600th episode (and 12-year anniversary), Danny and Alan examine several areas in which their views have changed, softened, strengthened, or remained stable over the lifespan of the podcast.
The discussion is therefore not only about nutrition itself, but also about the process of scientific reasoning: how positions are formed, what type of evidence can shift them, and why changing one’s mind is often a sign of better thinking rather than inconsistency.
The episode therefore serves as both a review of several specific nutrition controversies and a lesson in scientific epistemology. They discuss topics such as red meat, protein, dietary cholesterol, omega-3s, flavonoids, and sodium.
Related resources
- Join the Sigma newsletter for free
- Subscribe to Sigma Nutrition Premium
- Become a member of Alan Flanagan’s Alinea Nutrition Education Hub
- Enroll in the next cohort of our Applied Nutrition Literacy course
Studies Mentioned:
- TRE:
- Protein:
- Dietary Cholesterol:
- Cocoa Flavanols
- Red Meat:
- Omega-3 & CVD:
- Sodium:
- Energy Balance Model:
- [11:04]Time-restricted eating
- [19:32]Protein intake, quality & dosing
- [35:04]Cocoa flavanols and cognition
- [51:38]Unprocessed red meat
- [01:05:23]Omega-3 supplementation
- [01:23:10]Dietary cholesterol
- [01:44:41]Sodium J-curve myth
- [01:53:41]Energy balance model
The Hosts
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Dr. Alan Flanagan has a PhD in nutrition from the University of Surrey, where his doctoral research focused on circadian rhythms, feeding, and chrononutrition.
This work was based on human intervention trials. He also has a Masters in Nutritional Medicine from the same institution.
Dr. Flanagan is a regular co-host of Sigma Nutrition Radio. He also produces written content for Sigma Nutrition, as part of his role as Research Communication Officer.
Danny Lennon has a master’s degree (MSc.) in Nutritional Sciences from University College Cork, and he is the founder of Sigma Nutrition.
Danny is currently a member of the Advisory Board of the Sports Nutrition Association, the global regulatory body responsible for the standardisation of best practice in the sports nutrition profession.
Introduction to this Episode
“The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know, our knowledge of our ignorance. For this, indeed, is the main source of our ignorance — the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.”
– Karl Popper, Conjectures and Refutations, essay: “On the Sources of Knowledge and of Ignorance”
To mark Sigma Nutritionʼs milestone 600th episode (and 12-year anniversary), Danny and Alan examine several areas in which their views have changed, softened, strengthened, or remained stable over the lifespan of the podcast.
The discussion is therefore not only about nutrition itself, but also about the process of scientific reasoning: how positions are formed, what type of evidence can shift them, and why changing oneʼs mind is often a sign of better thinking rather than inconsistency.
The episode therefore serves as both a review of several specific nutrition controversies and a lesson in scientific epistemology. They discuss topics such as red meat, protein, dietary cholesterol, omega-3s, flavonoids, and sodium.
