In this podcast, we'll explore how eating a ‘blue’ muffin is an inexpensive and scalable technique allowing the measurement of transit time. The method was used to assess the relationship between gut transit time and the human gut microbiome, in a study published in paper copy in Gut, in September 2021.

"Blue poo: impact of gut transit time on the gut microbiome using a novel marker" is accessible here: https://gut.bmj.com/content/70/9/1665

Dr Philip Smith, Digital and Education Editor of Gut and Consultant Gastroenterologist at the Royal Liverpool Hospital, interviews Dr Sarah Berry, Department of Nutritional Sciences, King's College London, London.