Can taking special supplements help us to live longer?

It's the 100th episode of Sliced Bread and to mark the occasion we're investigating the pills and supplements that claim to help us live longer - and more healthy - lives. Listener Soly has heard about so-called 'biohackers' such as Bryan Johnson in the US, who are trying to turn back the clock on their biological age and reverse the process that makes their bodies vulnerable to illness and disease. Each day they're taking a special blend of compounds and chemicals which they claim slow down or even reverse the hallmarks of ageing.

Increasingly these supplements and diet plans are available to buy - but are they worth the money? Can they really extend our lives beyond the current normal human lifespan? What does the evidence say so far about their effectiveness?

Greg is joined in the studio by Dr Andrew Steele, author of 'Ageless: The New Science of Getting Older Without Getting Old' to try to unlock the secrets of staying young and run the studies through the evidence mill.

We could not have made it to 100 episodes of Sliced Bread without YOUR suggestions for wonder products to investigate. Please do keep them coming! If you have seen something claiming to make you happier, healthier or greener, and want to know if it is SB or BS, then please do send it over on email to sliced.bread@bbc.co.uk or drop us a message or voice note on WhatsApp to 07543 306807.

PRESENTER: GREG FOOT PRODUCERS: SIMON HOBAN AND PHIL SANSOM

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