Welcome to What’s Up Docs?, the podcast where doctors and identical twins Chris and Xand van Tulleken clear up the confusion around every aspect of our health and wellbeing.

In this episode, they want to answer some of the most important questions about dietary fibre. What is it and why do our bodies need it? They’ll explore the best sources of fibre - both natural and processed - and unpack the growing trend of fibre-enriched foods. Also, they’ll discuss easy ways to add more fibre into our daily routines without overhauling our diets.

They speak to Dr Deirdre Tobias, an obesity and nutritional epidemiologist at the Brigham and Women's Hospital and Harvard Medical School in Boston, to find out.

If you want to get in touch, you can email us at whatsupdocs@bbc.co.uk or WhatsApp us on 08000 665 123.

Presenters: Drs Chris and Xand van Tulleken Guest: Dr Deirdre Tobias Producers: Maia Miller-Lewis and Jo Rowntree Executive Producer: Rami Tzabar Editor: Kirsten Lass Maia Miller-Lewis Researcher: Grace Revill Tech Lead: Reuben Huxtable Social Media: Leon Gower Digital Lead: Richard Berry Composer: Phoebe McFarlane Sound Design: Ruth Rainey

At the BBC: Assistant Commissioner: Greg Smith Commissioning Editor: Rhian Roberts

A Loftus Media production for BBC Radio 4

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