Dr Philip Smith, Digital and Education Editor of Gut and Honorary Consultant Gastroenterologist at the Royal Liverpool Hospital, Liverpool, UK interviews Dr Soeren Ocvirk, from the Research Group WESTGUT, ZIEL - Institute for Food & Health, Technical University of Munich, Freising, Germany and the Gnotobiology Research Unit, German Institute of Human Nutrition Potsdam, Nuthetal, Germany, on the paper "Secondary bile acid production by gut bacteria promotes Western diet-associated colorectal cancer" published in paper copy in Gut in August 2026

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