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BBC Radio 4

Sliced Bread is the series that investigates the latest ad-hyped products and trending fads promising to make us healthier, happier and greener. Are they really 'the best thing since sliced bread'? Science presenter Greg Foot finds out.

Greg speaks to experts on a bunk-busting mission to test the latest consumer trends chosen by listeners. Do they live up to the hype? Or are they just marketing BS?

Greg chats to the experts, dives into the data, performs tests and crunches the numbers before putting his findings back to the listener so they can decide if it's worth spending their hard earned money on.

New episodes of Sliced Bread are released weekly on Thursdays wherever you get your podcasts. But if you're in the UK, you can listen to the latest episode on BBC Sounds first, a week earlier than anywhere else. 

If you have a suggestion for a product to investigate, you can email the team on sliced.bread@bbc.co.uk or send a WhatsApp voice note via the number 07543 306807.

Sliced Bread is produced by BBC Audio North for BBC Radio 4 and BBC Sounds.

Sliced Bread

Can Intense Pulsed Light devices really "zap" away your unwanted hair? 

You may have seen IPL devices advertised on social media - that promise painless hair removal using light to "zap" away body hair.

Listener Karen got in touch to ask if these "Zappers" could possibly free her from having to shave her legs in the summer? How are they supposed to work, are they safe to use, and is it worth the investing in one?

To find out, Greg Foot is joined by Dr Gill Westgate, a skin and hair biologist and honorary visiting lecturer at the University of Bradford. 

All of our episodes start with YOUR suggestions. If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at sliced.bread@bbc.co.uk OR send a voice note to our WhatsApp number, 07543 306807.

RESEARCHER: PHIL SANSOM

PRODUCERS: KATE HOLDSWORTH AND GREG FOOT

Hair Removal Devices

Are infrared saunas as effective as traditional ones?

If you've ever sat sweating on a wooden bench in a traditional ('Finnish') sauna wondering if there was an easier way, could infrared be the answer? Infrared saunas work at lower temperatures, ostensibly making it easier to stay in there for longer. Listener Paul got in touch after trying one and wants to know if infrared saunas give you the same purported benefits as traditional ones. 

Those claims include: improved cardiovascular health, weight loss, longevity and even benefits to mental health and depression. But what's the evidence and does it amount to a load of hot air?

To get the answers, Greg Foot is joined by Professor Chris Minson, an expert in the effects of heat on the body who's carried out research on infrared saunas. 

All of our episodes start with YOUR suggestions. If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at sliced.bread@bbc.co.uk OR send a voice note to our WhatsApp number, 07543 306807.

RESEARCHER: PHIL SANSOM
PRODUCERS: SIMON HOBAN AND GREG FOOT

Infrared Saunas

Almost everyone is guilty of fiddling with their ears, especially if they can feel a build-up of earwax in there. But what actually works to get rid of it, and should we be messing with them in the first place?

Listener Martin got in touch after finding out his earwax build-up was returning - and wanted to know if drops alone would solve his problem, or if he needed to seek professional help to remove it?

Greg Foot speaks to professor of Audiology at Manchester University, NIHR senior Investigator and former chairman of the British Society of Audiology, Kevin Munro - to find out. 

All of our episodes start with YOUR suggestions. If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at sliced.bread@bbc.co.uk OR send a voice note to our WhatsApp number, 07543 306807.

RESEARCHER: PHIL SANSOM

PRODUCER: KATE HOLDSWORTH & GREG FOOT

Earwax Removers

What's the latest on Collagen?

The new series of Sliced Bread kicks off with an update on one of the wonder products most-requested by listeners. Presenter Greg Foot first looked at Collagen in 2022 and returns to the subject to find out what has changed in the scientific landscape since then. Could there be new evidence that it really can do what the manufacturers claim: rejuvenate skin, nails and hair - and even help with joint and bone health? 

To find out, Greg is rejoined by the expert from that original episode four years ago, dermatologist Dr Emma Wedgeworth, alongside Professor Jayne Tierney from University College London who specialises in reviewing evidence.

Together they do a deep-dive on the latest science, including a new study from one of the brands featured in 2022, Absolute Collagen. Does it stand up to scrutiny?

If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at sliced.bread@bbc.co.uk or send a voice note to our WhatsApp number, 07543 306807.

RESEARCHER: PHIL SANSOM
PRODUCERS: PHIL SANSOM AND GREG FOOT

Collagen (2026 update)

What will the food of the future look like? Greg Foot finds out.

Greg Foot, host of BBC Radio 4’s Sliced Bread, returns with Dough — the series exploring the rise of future wonder products that could transform the way we live.

Each episode examines the emerging technologies and innovations poised to shape tomorrow’s world. Greg speaks with experts and entrepreneurs to uncover the trends influencing how today’s everyday essentials might evolve, before a leading futurist offers their predictions for life five, ten and fifty years from now.

This episode explores how our food choices could change as the climate becomes hotter and more volatile. Are we heading towards a menu built around ancient grains, 3D‑printed dishes and AI‑tailored nutrition plans? And where does lab‑grown meat sit — both in terms of public appetite and the rules needed to get it on our plates?

Alongside Greg, tucking in to a taste of the future, is futurist Tom Cheesewright, joined by expert guests including:

- Karina Zimerfeld, the Global Vice President of Research & Development at Mars Food & Nutrition
- Charles Banks, Partner & Managing Director of global trends agency The Food People 
- Owen Ensor, Chief Executive of Meatly 

This episode was produced by Linda Walker

Dough is a BBC Audio North Production for BBC Radio 4 and BBC Sounds

Dough - Food

Could smart glasses with built-in video cameras become widely accepted?

Greg Foot, host of BBC Radio 4's 'Sliced Bread' brings you 'Dough', examining the rise of future wonder products.

Greg is joined by experts, entrepreneurs and industry innovators to discuss the trends we're seeing today and where they may lead us tomorrow, before a leading futurist offers their predictions on what life might be like within five, ten and fifty years.

This time we’re looking at the future of eyewear - asking whether smart glasses with built-in video cameras might see past previous failures to become widely accepted?

And whether you might soon be wearing smart contact lenses that can not only display websites and messages, but also potentially monitor your eye health? 

Greg is joined by the futurist Tracey Follows and guests including:

- Priya Morjaria, Assistant Professor in International Eye Health at the London School of Hygiene and Tropical Medicine and Head of Global Programme Development at Peek Vision

- Alex Himel, Vice President of Wearables at Meta which is selling smart glasses with embedded artificial intelligence, cameras, microphones and speakers.

- Professor Philip Morgan, Head of Optometry at the University of Manchester

Produced by Jon Douglas. Dough is a BBC Audio North Production for BBC Radio 4 and BBC Sounds

Dough - Eyewear

What will the office be like in future? 

Greg Foot, host of BBC Radio 4's 'Sliced Bread' brings you 'Dough', examining the rise of future wonder products.

Greg is joined by experts, entrepreneurs and industry innovators to discuss the trends we're seeing today and where they may lead us tomorrow, before a leading futurist offers their predictions on what life might be like within five, ten and fifty years.

This time we’re looking at the future of the office - asking whether in years to come, we’ll even need one? 

If so, is the ‘conference room’ soon to be a thing of the past, replaced with cafes, comfy chairs, and table tennis tables?

And will our future HQs be home to service robots and AI receptionists?

Greg learns how the Covid-19 pandemic changed office working and the trends transforming the look of high-end office developments. He is joined by the futurist Tom Cheesewright and guests including:

- Professor Matt Davis, University of Leeds
- Jane Clay, Strategy Leader and Principal at Gensler which designs and refurbishes buildings around the world
- Mike Dalloz, Chief Executive Officer and Co-founder of The Meeting Pod Company.

Produced by Jon Douglas. Dough is a BBC Audio North Production for BBC Radio 4 and BBC Sounds.

Dough - The Office

Could ticketless travel and satellite connectivity be coming to our rail network? 

Greg Foot examines the rise of future wonder products.

He's joined by experts, entrepreneurs and industry innovators to discuss the trends we're seeing today and where they may lead us tomorrow, before a leading futurist offers their predictions on what life might be like within five, ten and fifty years.

In this episode Greg hears how renationalisation, digital signalling, satellite connections, ticketless technology and battery power might transform our trains in the future. 

With him is the futurist Tom Cheesewright and guests including: 

- Dickon Ross, Editor of Rail Magazine
- Maggie Simpson OBE, Director General at the Rail Freight Group
- Mike Butler, Director of Rail & Innovation at Clarus Networks

Produced by Jon Douglas. Dough is a BBC Audio North Production for BBC Radio 4 and BBC Sounds.

Dough - Trains

What will mobile phones be like in future? Greg Foot investigates

Greg Foot, host of the BBC Radio 4 show 'Sliced Bread', brings you 'Dough'.

Each episode explores future wonder products that might rise to success and redefine our lives.

Experts and entrepreneurs discuss the trends shaping what today's everyday technology may look like tomorrow, before a leading futurist offers their predictions on what life might be like within five, ten and fifty years.

This time we’re looking at the future of mobile phones - asking whether our handsets will shrink, stretch, roll, fold… or even disappear as new technology takes over? And will super-smart devices with AI assistants that second-guess our every move become the new normal? 

Alongside Greg is the futurist, Tracey Follows, and expert guests: leading strategist in the tech industry, Chetan Sharma, innovator and creator from one of the world’s newest Mobile Phone manufacturers, “Nothing Mobile", their AI and design lead, Sélim Benayat and co-founder and CEO of Honest Mobile, Andy Aitken.

This episode was produced by Linda Walker

Dough is a BBC Audio North Production for BBC Radio 4 and BBC Sounds

Dough - Mobile Phones

Sleep deprived parents everywhere are tempted to reach for anything that might help them get a little more sleep overnight – but can products promising to encourage babies to snooze for longer – really do that? And is there any science to back it up?

That is exactly what tired Dad-of-three Dave wanted to know – and whether there were any future implications from using these gadgets, docks, blinds and sleep bags? 

New Dad Greg Foot speaks to Director of the Durham Infancy and Sleep Centre Professor Helen Ball, to find out. 

You can also read the official Safer Sleep guidance, by copy and pasting the links below into your browser:

NHS - https://www.nhs.uk/best-start-in-life/baby/baby-basics/newborn-and-baby-sleeping-advice-for-parents/safe-sleep-advice-for-babies/

Lullaby Trust - https://www.lullabytrust.org.uk/baby-safety/safer-sleep-information/safer-sleep-overview/

RESEARCHER: PHIL SANSOM

PRODUCER: KATE HOLDSWORTH & GREG FOOT

Infrared Saunas

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