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What's Up Docs?

Doctors' Notes: Fibre

What's Up Docs?

BBC

Health & Fitness, Nature, Science

4.4659 Ratings

🗓️ 23 September 2025

⏱️ 18 minutes

🧾️ Download transcript

Summary

Chris and Xand continue their conversation about fibre with Dr Deirdre Tobias, an obesity and nutritional epidemiologist at the Brigham and Women's Hospital and Harvard Medical School in Boston, USA.

Together, they dig further into the relationship between our fibre intake and our microbiome. Plus, they delve into some of the socioeconomic aspects of increasing our intake of fibre.

If you’d like to share your thoughts on this or any other topic covered on the podcast, you email us at whatsupdocs@bbc.co.uk or Whatsapp 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.

Transcript

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0:00.0

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0:07.5

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0:10.8

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0:13.8

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0:14.9

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0:17.6

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0:19.4

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0:21.4

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0:44.0

Hello and welcome to Doctor's Notes, the bonus content we put together each week for you so that like us, you can take a deeper dive into the science at the main topic from

0:48.0

what's up docs each week. I'm Chris Van Tiliken. I'm Dr Zandt, and this is where we keep our experts

0:53.1

for a little bit longer.

0:58.6

We're trying to gather as much insight and intrigue as we possibly can. We can't help it.

1:00.8

Once we got them on the line, we want them to keep talking.

1:07.7

We've just finished recording an episode with Dr. Dairdry Tobias. She is an obesity and nutritional epidemiologist at the Brigham and Women's Hospital and Harvard Medical School in Boston.

1:13.3

That's right, Chris. So in the main episode, we discussed, I guess the short and long-term benefits of fibre, where to get it, why it's good for us.

1:23.7

Are there any different types? Is it okay to use fiber supplements? I think that was all pretty clear.

1:29.7

Now we're going to do a deeper dive into more about the socio-economic aspects of fiber. It's

1:35.7

expensive to eat a high-fiber diet. We went into a bit more detail on the microbiome.

1:41.0

And why people might think they're going to struggle more than they are

1:45.2

with a high-fiber diet? That's right. Dedra had great answers to every single question that we put

1:49.5

her. Let's open the notes, Sandy, make the rusty sound.

2:05.9

Dedra, thank you so much for staying on for some bonus content.

...

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