Edinburgh gardener Alan got in touch with Sliced Bread, to ask if he really needs to be spending money on buying and applying plant food or fish, blood and bone meal to his roses and woody perennials?

He was keen to know what is in these commercial plant foods that come as a solid, liquid or granule, how often he is supposed to use them, whether they make as much of a difference as they claim, and if he can save money by making his own “mulch” out of fallen leaves?

Greg Foot investigates with the help of Gardener’s Question Time’s expert and botanist, Pippa Greenwood – as well as Head of Fertilisers from the Agricultural Industries Confederation Jo Gilbertson. They “dig in” to the claims on the packets, and try to determine if pricey plant foods are the best thing since Sliced Bread?

We are looking for more of YOUR suggestions of products to investigate. If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at [email protected] OR send a voice note to our WhatsApp number, 07543 306807.

PRESENTER: GREG FOOT

PRODUCER: KATE HOLDSWORTH

Do Boiling Water Taps save you money?

They're often seen in offices but boiling water taps are increasingly popular for the home kitchen too. They hold hot water at a constant temperature in a tank under your sink and claim to save you money compared to boiling a regular kettle. But does the evidence back up the marketing hype?

Listener Jenny got in touch with Sliced Bread because she's upgrading her kitchen and is thinking about investing in a boiling water tap. She's keen to know how the figures for daily use stack up - and if there IS a saving how long it would take before she gets her money back on the original outlay. And then there's maintenance too...

Greg is joined in the studio by Jenny and energy expert Mark Thompson to crunch the numbers, along with Debbie Birkbeck from Stopcocks Women Plumbers.

We are looking for more of YOUR suggestions of products to investigate. If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at [email protected] OR send a voice note to our WhatsApp number, 07543 306807

PRESENTER: GREG FOOT

PRODUCERS: SIMON HOBAN AND PHIL SANSOM

Grounding Sheets - do they really work?

It's perhaps the most-requested product in Sliced Bread history but is there any real science behind grounding (or 'earthing') sheets? The claims made for them are wide and varied - from reducing inflammation and pain, to helping with sleep. How do they do this? Proponents say grounding sheets connect you to the Earth's own electrical field and dissipate electrical charges in your body, built up though everyday activities like wearing rubber-soled trainers. Prices of grounding sheets vary from £30 to £150.

Listener Alison is thinking of buying one and wants to know if it could ease pain and help her sleep better. She joins Greg in the studio along with two experts for a deep-dive into the science to find out whether grounding sheets are the best thing since sliced bread - or marketing BS.

We are looking for more of YOUR suggestions of products to investigate. If you’ve seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at [email protected] OR send a voice note to our WhatsApp number, 07543 306807

PRESENTER: GREG FOOT

PRODUCERS: SIMON HOBAN AND PHIL SANSOM

Which cooking oils are best for your health?

Listener Sarah got in touch after seeing claims on social media that more expensive oils are better for you than regular vegetable, or rapeseed oil. And listener Kamal sent us a voicenote asking about coconut and avocado oil - both touted as healthier alternatives to other types of oil. Are they worth the extra cost? And what about health concerns if certain oils are overheated?

To get the answers Greg is joined by Professor of Population Health and Nutrition at the University of Cambridge, Nita Forouhi. Together they deep-dive into the studies and evidence, finding out what compounds constitute a healthy oil and giving advice on what we should be looking out for on the bottle.

All of our investigations 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 [email protected] OR send a voice note to our WhatsApp number, 07543 306807

PRESENTER: GREG FOOT

PRODUCERS: SIMON HOBAN AND PHIL SANSOM

Listener Helen from Manchester got in touch to ask about Protein Powders, as she considered replenishing her supply that she’s been taking after long distance runs.

She wanted to know if Whey or Plant-based protein really can help her build and repair muscle, whether there’s a set amount she should be having, if one type is better than the other, or if she could just get the protein she needs from her food – and save on buying another bag?

Greg Foot brings back Professor of Human Physiology, Sport and Exercise Sciences at Liverpool, John Moores University, Graeme Close to answer Helen’s questions, tell us what our body needs and uses protein for, and whether it really can deliver ‘Gainz’ (with a Z.)

As always, all of our investigations 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 [email protected] OR send a voice note to our WhatsApp number, 07543 306807.

PRESENTER: GREG FOOT

PRODUCER: KATE HOLDSWORTH & PHIL SANSOM

Listener Steve got in touch with us after trying out a set of Smart Scales himself. He wanted to keep an eye on his protein levels – which his scales claimed to do – for health reasons, and because he’d heard that we need more protein as we get older.

His scales also promised to show him his body fat, muscle mass, and bone mass via a corresponding app on his phone. However, some of those readings didn’t seem quite right – making him question how accurate his scales are, and if they can REALLY tell you so much about yourself?

Greg Foot asks two experts - a GP and a professor of applied mathematics – to weigh in on the topic, and find out whether these scales can measure up.

As always, all of our investigations 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 [email protected] OR send a voice note to our WhatsApp number, 07543 306807.

PRESENTER: GREG FOOT

PRODUCER: KATE HOLDSWORTH

Can you insulate your home for less than £100?

With winter setting in listener Robin got in touch with Sliced Bread to find out if there's a way he can insulate his very old, very cold Victorian house on a budget. He's seen plastic films that go over the windows and silver foil-type backings that go behind the radiators. Do any of them work to keep the cold out and more of that precious heat in? And what about other solutions like thick curtains or blinds - can they be effective?

Greg is joined in the studio by listener Robin and expert David Farmer from the Energy House in Salford - a bespoke replica terraced house built in a warehouse which can recreate a range of weather conditions, from snowstorms to balmy summer days!

And as always, all of our investigations 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 [email protected] OR send a voice note to our WhatsApp number, 07543 306807.

PRESENTER: GREG FOOT

The team has gone through over 100 episodes of Sliced Bread, and carved out five popular products that may well be heading down a chimney to you this Christmas.

Greg Foot will share with you the key points from experts we’ve spoken to on Air Fryers, Mascara, Perfume, Running Shoes, and DNA Ancestry Tests - as well as their conclusions in one handy festive slice! We’ve also updated some of the topics too. (The information in this episode was correct at the time of recording.)

And as always, all of our investigations 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 [email protected] OR send a voice note to our WhatsApp number, 07543 306807.

PRESENTER: GREG FOOT

Can wonder products halt hair loss and grow back luscious locks?

We're back with a new series of Sliced Bread and a fresh batch of investigations into your suggested wonder products. First up this time are lotions and pills that promise to stop hair loss - and even grow it back. For this episode Greg is joined at our Salford studios by two listeners, Ian and Kimberley.

Ian got in touch about two products he's seen - Minoxidil and Finasteride - which he hopes can help with male pattern baldness. And listener Kimberley is keen to know whether there's anything she can do about hair loss which is caused by menopause. To get the answers Greg speaks to one of the most cited researchers in the hair loss world - Ralf Paus - as they deep-dive into the studies to separate the science fact from the marketing claims.

As ever this series it's YOUR suggestions that are the start of all our investigations. If you've seen an ad, trend or wonder product promising to make you happier, healthier or greener, email us at [email protected] OR send a voicenote to our WhatsApp number 07543 306807

PRESENTER: Greg Foot

The mobile phone retailer, Phones 4u, was hugely profitable, so why did it have to close all of its 700+ shops?

The BBC Business journalist, Sean Farrington and the entrepreneur, Sam White discover how Phones 4u ended up toast with help from expert guests including:

John Caudwell - Phones 4u founder

Nikki Barrow & Chris Papageorgiou - former Phones 4u staff members

Ian White - editor of Mobile News magazine

Produced by Jon Douglas. Toast is a BBC Audio North production for BBC Radio 4 and BBC Sounds.

You can email the programme at [email protected]

Feel free to suggest topics which could be covered in future episodes.

Sliced Bread returns for a new batch of investigations in December, where Greg Foot investigates so-called wonder products to find out whether they really are the best thing since sliced bread. In the meantime, Toast is available in the Sliced Bread feed on BBC Sounds