Daily Mail UK I didn't eat for 23 days, lost 49lb and felt healthier than ever, says DONAL MACINTYRE. So when the longevity guru doctor behind it raved about three-day total darkness experiment, I wanted to take part. What happened next changed my life...
In prisons, they call it solitary confinement. But the modern cell in which I recently found myself isolated is part of a high-end experience billed as 'The Ultimate Darkness Retreat'.