Okinawa is one of the world's 'Blue Zones', areas in which people live unusually long lives... or so we've heard. It's even been described as the 'land of the immortals'.

In this first episode of Blue Zones: Revisited, we ask just how unusual Okinawa's population really is, consider whether purple sweet potatoes might be the secret to a long life, and take seriously the advice of 99-year-old Fumi Chinen who says 'if anyone ever gives you something and tells you it's healthy, don't eat it.'

Further Reading:

Calorie consumption in Afghanistan

Adult BMI in Japan's 47 prefectures

Middle-aged and elderly hikikomori

Support for aging hikikomori

Ikigai and retirement

Elderly population of Fukushima

Fukushima population statistics

Last Fukushima town reopens

World record centenarian beauty adviser

Elderly population of Chernobyl

Exceptional Longevity in Okinawa: A plea for in-depth validation

Declining Longevity Advantage in Okinawa