Myth or fact

Are blue zones real?

Short answerSort of

By GyroscopeUpdated November 15, 202626 sources

Sort of. The habits the blue zones are famous for, eating mostly plants and beans, moving all day and staying close to friends and family, hold up in big studies with good records. A lot of the record ages don’t. Some were clerical errors, some were pension fraud, and in two of the best checked places the real advantage is fading with each generation.

Why does everyone believe it?

It’s a great story, and it started with real science. In 2004 a team of demographers mapped the mountain villages of central Sardinia where an unusual share of the people reaching 100 were men, and called the area the “Blue Zone”. The next year Dan Buettner’s National Geographic cover story, “The Secrets of Long Life”, put Sardinia beside Okinawa in Japan and the Adventists of Loma Linda, California. Nicoya in Costa Rica and the Greek island of Ikaria joined the list later.

The lessons were simple and appealing. Eat beans, garden, walk up hills, keep your friends close, have a glass of red. Places you can visit, food you can buy, and a reason to believe long life is a recipe. It also became a business. In 2020 Adventist Health bought Blue Zones, for a reported $78 million, and in 2023 Netflix released a four-part series, “Live to 100: Secrets of the Blue Zones”. By 2026 the brand was helping to market a $600 million luxury tower in Miami.

A picture from daily life

Think of a fish story. Every time it’s told, the fish gets a little bigger, and nobody’s lying on purpose. Then someone brings a scale. For the world’s oldest people, the scale is a birth certificate, and the places with the biggest fish tend to be the places with no scale at all.

Who was Tokyo’s oldest man?

In July 2010, police in Tokyo went to the home of Sogen Kato, listed as the city’s oldest man, who would have been 111. They found he’d been dead for more than three decades. His relatives were arrested on suspicion of abandoning a body and collecting millions of yen in pension payments. They said he’d shut himself in his room wanting to become a living Buddha.

Japan then checked its family registers and found 234,354 people aged 100 or older listed as alive whose whereabouts were unknown. Most of those turned out to be old entries nobody had crossed out, rather than fraud. Demographers who studied it found the effect on Japan’s life expectancy figures was “effectively nil”. But it showed how easily a record of a very old person can outlive the person.

What happens when birth certificates arrive?

In 2019 the demographer Saul Justin Newman went through the world’s records of people said to be 110 and over. In the US, those records fell by 69 to 82 percent after each state brought in birth certificates. Only 18 percent of the most thoroughly checked supercentenarians in the world had a birth certificate at all, and none of the ones in the US. Their recorded birthdays were 1.4 times as likely as chance to fall on the first of a month, and 1.2 times as likely to fall on a day divisible by five, which is what happens when people guess.

His paper has been posted in four versions since 2019 and is still a preprint, which means no journal has published it after peer review. Newman says it has been through nine rounds of review at one journal. It won him the 2024 Ig Nobel Prize in Demography. His earlier, peer-reviewed paper made the same kind of point another way. Age errors at a rate below 1 in 10,000 records were enough to make it look as if death rates stop rising in very old age.

Were Greek centenarians collecting pensions?

Some were, long after they’d died. In August 2011, Greece stopped pension payments to 1,473 pensioners over 90 who turned out to be dead. About 9,000 Greeks aged over 100 were drawing pensions, against fewer than 1,700 centenarians counted in the 2001 census. In 2012 the government halted welfare or pension payments to 200,000 people who were either dead or not entitled to them. Newman’s preprint reports that at least 72% of the Greek centenarians in the census were found to be dead in 2012, and that Ikaria and the neighbouring island of Samos had only 13 centenarians between them in the 2011 census.

Why did Okinawa fall down the table?

Okinawa was the poster child, and its own government statistics tell a sad story. Okinawan men had the longest lives in Japan in 1980 and 1985. By 2020 they ranked 43rd of 47 prefectures. Okinawan women were 1st for 30 years and are now 16th.

Younger Okinawans now die at higher rates than mainland Japanese, and part of the old record may never have been right. About 90% of Okinawa’s family registers were destroyed in the Second World War and rebuilt from what people told officials. Okinawa also has the second-lowest median income of Japan’s 47 prefectures, which isn’t what you’d expect of the healthiest place on earth. In 2024 Michel Poulain, the demographer who first mapped the Sardinian blue zone, wrote that the post-war rebuilding involved “false declarations of age”. He still concluded that Okinawans born before the war remain exceptional. In 2025 a review co-written by another blue zone researcher said Okinawa “no longer meets Blue Zone requirements”.

What do the blue zone researchers say?

Are the blue zones fading?

Yes, and the people who found them say so. In Nicoya, men born in 1905 had a 33% lower adult death rate than other Costa Ricans, in a study of 550,000 adults. Men born in 1945 had a 10% higher one, and the hotspot has shrunk to a small strip of the peninsula. The author, Luis Rosero-Bixby, one of the demographers who signed the 2024 defense of the blue zones, wrote that “hotspots of extreme longevity are probably transient”. Dan Buettner told STAT in 2026 that “all blue zones are waning right now”.

In April 2026, the American Federation for Aging Research published a formal definition. A place now needs “administrative data strong enough to support age validation”, and a count of 100-year-olds alone doesn’t qualify it.

So is it real, a myth or pension fraud?

All three, in different places.

What can we learn from these places?

The habits, which have been tested in large groups with good records. They hold up there, without any record ages.

The other lesson is about the oldest ages themselves. A claim that rests on people over 105 is only as good as the paper behind them, so ask who checked. For your own life, the same few habits work everywhere. Eleven minutes of brisk walking a day, about half the US minimum, went with a 23% lower death rate in a 2023 review, and nobody has tested a village diet that way.