Why do people who live in five communities around the world – known as Blue Zones- consistently outlive the rest of us on the planet? Professor Cregan-Reid goes in search of the secret of a long life. He visits Sardinia home to one of those long lived communities where several villages boast dozens of people aged 100 or more.

What used to kill us routinely no longer does so - at least not in such numbers. By rights many, many more of us should be emulating the residents of the Blue Zones and living well beyond 100. Instead we are succumbing to lifestyle diseases and longevity could even be about to fall for future generations. The good news is researchers in the Blue Zones have identified seven easily adapted rules for a longer life!

(Photo: Ushi Okushima, a 105-year-old woman from the village of Ogimi, Okinawa, Japan. The village is known as "longevity village" due to the long life span of residents there. Credit: Mie Kohiyama/AFP/Getty Images)