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Hello, I'm Greg Foote and welcome to Slice Bread, the show that investigates the

Wonder Products promising to make you happier, healthier or greener. Each episode, we follow

the crumbs of evidence to find out if one of your suggested Wonder products is indeed

the best thing since sliced bread or marketing BS.

And today's suggestion comes from Susan Moore from Manchester. Welcome to the studio, Susan.

Hello. Tell us the wonder product that you'd like us to investigate today. I'd like you to

investigate sharp knives. Every knife I buy, I was dull after a very short amount of time, no matter how hard I try. I do all the right things. I don't put it in the dishwasher. I use a wooden chopping board, but they don't stay sharp. How frustrating. I'm really looking for a single knife that does everything. Are you happy to pay more for that knife?

Yes, because the knives that I've had in the past have probably lasted no more than a couple of years.

So over time, they've worked out quite expensive. And also, I don't like the idea of them just going to

landfill or wherever they go. I don't know how you get rid of an old knife. So you said you've been frustrated with the knives you've bought in the past. Yes. They've gone blunt quickly. Did you ever try sharpening any of those blunt knives? I've got a butcher's steel, which I use. Did it help? A little bit, but it's not restored the knife to its original sharpness, which was very sharp. Right, okay. Well, I've got to say knives and indeed knife sharpeners are a perfect topic, aren't they, for sliced bread? Because otherwise you've got a solid loaf. So I want to know about bread knives. Following our previous episode on chopping boards, we've had loads of requests to do a deep dive on knives.

Thanks to everyone who's emailed us on Slice.bred at BBC.co.com, including listener John in Middlesex,

who wrote, as an enthusiastic home cook, I am frequently found pondering in cookware shops,

loitering over the knife blocks. Some are priced in an acceptable 50 pounds for a decent

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