#601: Gallstones & Gallbladder Conditions: Impact of Diet – Angela Madden, PhD RD

#601: Gallstones & Gallbladder Conditions: Impact of Diet – Angela Madden, PhD RD

Author: Danny Lennon April 14, 2026 Duration: 53:26

This episode examines what we actually know (and importantly, what we do not know) about diet in relation to gallstones and gallbladder conditions. Much of the public-facing guidance around gallstones focuses on "avoiding fatty foods", yet Dr. Angela Madden explains that this long-standing practice sits on surprisingly weak direct evidence, particularly when judged against the standards typically expected for clinical dietary recommendations.

A central theme is the need to separate two distinct questions: dietary factors that influence the risk of developing gallstones (prevention), versus dietary strategies intended to reduce symptoms or complications once gallstones exist (management). While the prevention literature suggests plausible, consistent associations with overall diet quality and lifestyle factors, the specific question of prescribing a low-fat diet to manage symptomatic gallstones lacks robust randomized trial evidence.

Dr Angela Madden is a clinical researcher in nutrition and dietetics at the University of Hertfordshire, where she established and led the nutrition and dietetics subject group and now focuses her research on improving nutritional assessment, dietary interventions, and patient-centred outcomes in clinical and public health settings.

Timestamps

  • [02:09] Discussion with Dr. Angela Madden begins
  • [06:53] Understanding the gallbladder
  • [08:08] Gallbladder disorders and their prevalence
  • [13:42] Risk factors and pathophysiology
  • [22:15] Dietary factors and gallstone formation
  • [27:20] Exploring dietary fat and gallstones
  • [34:09] Broader dietary considerations
  • [45:44] Practical dietary recommendations

Related Resources


Sigma Nutrition Radio, hosted by nutrition scientist Danny Lennon, moves beyond the noise of diet trends and simplistic advice to explore the complex, fascinating world of human nutrition. This is a space for deep, evidence-based conversations that acknowledge the nuance and often contradictory nature of scientific research. Each episode delves into a specific topic within health, fitness, or dietetics, breaking down the underlying physiology, examining the latest studies, and discussing practical implications with expert guests. The goal isn't to hand out rigid meal plans but to cultivate the critical thinking skills necessary to navigate the ever-changing landscape of nutritional science. You'll hear detailed analyses of how research is conducted, thoughtful debates on contentious issues, and explorations of how evidence translates-or doesn't-into real-world recommendations for different individuals. Tuning into this podcast means committing to a more sophisticated understanding of how food, movement, and metabolism interact, leaving you better equipped to make informed decisions about your own health and skepticism towards the next big headline. Danny’s approach is both rigorous and accessible, making even the most detailed biochemical pathways relevant to everyday life. It’s for anyone who has ever wondered about the real story behind a nutrition claim and values substance over soundbites.
Author: Language: English Episodes: 100

Sigma Nutrition Radio
Podcast Episodes
#564: Is Protein's Appetite-Suppressing Power Overstated? [not-audio_url] [/not-audio_url]

Duration: 1:11:19
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…
SNP40: Do Seed Oils Cause Inflammation & Chronic Disease? [not-audio_url] [/not-audio_url]

Duration: 14:48
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 unju…
#562: How to Detoxify Yourself – Quack Asylum Special [not-audio_url] [/not-audio_url]

Duration: 1:20:51
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…