Deceptive Diets: The statistics fabricating Blue Zones
Written by Sophia Gerrans
Edited by Rathusha Nimalan
Herminia watches the researchers approach from her front porch. They don’t mind that she is not standing to meet them – after all, she is 101 years old.
As the researchers press record on the voice recorder, Herminia describes her life – stretching back to the Spanish Civil War. But despite her lifetime achievement, Herminia’s age is not unique in southern Galicia, Spain. Her father lived to 96, her husband to 103, and many of her neighbors are in their 90s: still kicking.
José Maria Felde and his research team have one goal: to determine whether southern Galicia is a “blue zone.” As BBC 2024 defines, blue zones are geographic regions with a high concentration of centenarians: people who live to be over 100 years old. Researchers have long investigated the diets and lifestyles that might have contributed to this longevity.
The term blue zone was coined by demographer Michael Poulain in the 1990s, when he traveled to the Mediterranean island of Sardinia. Traveling town to town, Poulain marked the location of centenarians on a map. The color of his pen? Blue. When he looked down at the map, Poulain noticed certain high-density clusters of centenarians, which he labeled blue zones.
Coincidentally, across the globe, journalist and explorer Dan Buettner, when investigating Okinawa, Japan, saw the exact same phenomenon. After publishing his 2005 article, “Secrets of a Long Life,” Buettner was contacted by Poulain – who approached him with a proposal: working together to pinpoint more blue zones. In the decades following, the pair located areas where centenarians appeared at abnormally high rates, like the Costa Rican peninsula of Nicoya or the Greek island of Ikaria.
It was not long before blue zones became commercialized. As the research gained popularity, companies used the “blue” motif to market anti-aging products. Buettner, wishing to protect the research, trademarked the term “blue zone.” Yet what started off well-intended took a turn: Buettner began selling cookbooks and lifestyle guides – monopolizing the blue market.
Poulain wanted nothing to do with the money. When Buettner tried to convince Poulain to testify with him against Chanel’s “Blue Serum”, Poulain broke ties with Buettner. This breakup resulted in two official Blue Zone lists: one owned by Buettner’s Blue Zone LLC and the other by Poulain.
But not everyone is convinced by the Blue Zone promise. In September 2024, Dr Saul Newman won the Ig Nobel Prize for investigating the statistical errors behind blue zones. Newman first points out Buettner and Poulain’s mathematical oversights. The pair used a basic method for their centenarian rate – the proportion of the entire population. But as Newman points out, their math ignores baby booms or migrations, which have exaggerated effects on the total population. So instead, Newman derived the centenarian attainment rate, which tracks how many 80-year-olds make it to 100 – a rate less sensitive to population shifts. This method showed that blue zones were not as statistically significant as the original work presented.
Yet, even with Newman’s revised methodology, it appeared that most of the world’s supposedly healthiest individuals lived in regions with extreme health disparities, like Kenya and Malawi – areas with high poverty rates and low literacy rates. The final nail in the coffin? Many of these places had poor documentation of birth and death dates, combined with newer civil registration infrastructure. As Newman revealed, the “secret” of Blue Zones was not healthy living, but faulty record-keeping.
Two years after Newman’s research was released, Blue Zones are as popular as ever. In 2026, Delta Airlines even launched “blue zone flights.” But as Professor Jaeyon Choe from Pennsylvania State University warns, this is not a travel trend, but modern colonialism. When foreign investors build luxury hotels in blue zones to cater to health-curious travelers, the developments disrupt housing markets, fail to reach local businesses, and threaten cultural preservation. Wellness tourism appropriates local heritages and economies – ultimately subsidizing the lie of Western longevity.
Buettner’s original lessons from the blue zone suggest eating vegetables, walking more, and spending time with family: none of which are bad tips for living a good life. But the public never needed misleading research—and a Blue corporation—to sell them.
(Sophia Gerrans ’27 is in the College of Agriculture and Life Sciences. She can be reached at sg2388@cornell.edu.)
