Blue Zones Explained: What We Can Learn About Longevity

Five places on earth where people supposedly reach 100 at extraordinary rates. Beans, walking, wine at five, a strong sense of purpose. It is one of the most successful health stories of the past twenty years — and now one of the most bitterly contested.

Wider context sits in our longevity supplements guide and the anti aging supplements range; for the compounds people usually ask about next, see NMN benefits, side effects and dosage, the NMN supplements collection and NMN Pro 1000 — though as this article shows, the Blue Zones provide no support for any of them.

What follows explains where the idea came from, sets out the demographic challenge to it, gives the published response from the researchers being criticised, and then works out what survives either way. A surprising amount does.

Where the idea came from

A map, a blue pen, and one Sardinian province

The term originated with Belgian demographer Michel Poulain and Italian physician Gianni Pes, who were validating longevity claims in the Nuoro and Ogliastra areas of Sardinia in the early 2000s. They marked longevity clusters on a map in blue ink, and the converging dots gave the concept its name. Their findings were published as the AKEA study in Experimental Gerontology in 2004 [8].

The original claim was narrow and specific. It concerned six villages in rural Ogliastra containing roughly 12,000 people, where 0.51% of the cohorts born between 1880 and 1900 reached 100 — around three times the rate for Sardinia as a whole and roughly five times the European rate — with an unusual near-parity between male and female centenarians [4,8]. That male-to-female ratio, not the raw number, was the genuinely odd finding, since worldwide there are roughly three female centenarians for every male.

How it became a global brand

Journalist and National Geographic fellow Dan Buettner, who had joined the project, published a National Geographic cover story in 2005 and subsequently expanded the concept to five regions, a set of nine shared habits, a series of books, and the 2023 Netflix documentary Live to 100. The scientific concept and the commercial concept are not the same thing, and the distinction matters throughout what follows.

The five zones and the Power 9

The nine attributed habits — "Power 9" in Buettner's framing — are: natural movement built into daily life, a sense of purpose, routine downshifting from stress, eating to around 80% fullness, a plant-slanted diet, moderate wine intake, belonging to a faith community, putting family first, and belonging to a supportive social circle.

Read as a list, they are entirely reasonable. The disputed question is whether they explain anything about these five regions in particular.

The challenge: what Newman found

The Ig Nobel Prize in Demography

In September 2024, the Annals of Improbable Research awarded the first-ever Ig Nobel Prize in Demography to Dr Saul Justin Newman, then at University College London. Despite the name, these awards go to research that "makes people laugh, and then think" — and Newman's work is entirely serious in intent. He received it for demonstrating that extreme old-age records exhibit patterns indicative of clerical errors and pension fraud, and specifically for challenging the Blue Zones concept [1].

What he argues

Rather than accepting reported statistics, Newman audited age records region by region across the United States, Italy, England, France and Japan. His central findings [1,2]:

• The highest rates of reaching extreme old age are predicted by high poverty, absent birth certificates, and fewer 90-year-olds — the opposite of what a genuine longevity cluster should look like.
• Only around 18% of "exhaustively" validated supercentenarians have a birth certificate.
• In the United States, the state-by-state introduction of birth certification is associated with a 69–82% fall in supercentenarian records.
• Recorded supercentenarian birthdates cluster implausibly on the first of the month and on dates divisible by five.
• The designated Blue Zones of Sardinia, Okinawa and Ikaria corresponded to regions with low incomes, low literacy, high crime rates and shorter life expectancy relative to their national averages.

Japan's missing centenarians

The record-keeping concern is not hypothetical. A 2010 Japanese government audit of family registries found that a very large number of people recorded as living centenarians — reported at around 230,000 — could not be accounted for, being long dead, never deregistered, or clerical ghosts. Some cases involved families continuing to draw pensions. The best-known example, Sogen Kato, was believed to be Tokyo's oldest man until his remains were found in 2010; he had died in 1978 [10]. Okinawa also lost a substantial volume of civil records during the Second World War.

The status of the evidence

Newman's headline paper was circulated as a preprint in 2019, updated in 2020 and again in 2024, and has still not been published in a peer-reviewed journal [2,3]. As of May 2026 he reported it had been through nine rounds of review at BMJ Public Health without a decision, and attributes this to resistance within the field [3]. His earlier work correcting a Nature paper on limits to human lifespan was peer-reviewed and stands [1].

The response from Blue Zones researchers

Reporting the critique without the reply would be a poor account of the state of the argument, so here it is.

The peer-reviewed rebuttal

In December 2025, The Gerontologist — a journal of the Gerontological Society of America — published "The validity of Blue Zones demography: a response to critiques" by Steven N. Austad of the University of Alabama at Birmingham and Giovanni M. Pes of the University of Sassari, one of the original Sardinian researchers [4].

Their argument is that the age-validation process used in the Blue Zones does not rely on self-declaration but on written records from multiple independent sources — birth, baptismal, marriage, military and death registers — cross-checked against one another, and that this meets prevailing standards in gerontological demography [4]. They give worked examples: in Nicoya, checking 35 claimed centenarians against municipal birth registers invalidated one, who was found not yet to have reached 100 [4].

Note what that example demonstrates. The validation process is capable of rejecting claims, which is the test of whether a process is doing anything.

The scope objection

Buettner's own response makes a narrower point that is worth taking seriously on its own terms. He states that his work concerns people aged 90 and over rather than supercentenarians aged 110 and over, and that much of Newman's data addresses larger administrative regions rather than the specific villages designated as Blue Zones — Sardinia's crime and poverty statistics, for instance, being driven by cities rather than rural Ogliastra [11].

If that is right, then a critique built largely on supercentenarian records does not straightforwardly transfer to claims about nonagenarians in six villages. Newman's counter is that what demographers call validation amounts to checking documents against one another for consistency, which cannot establish that the earliest document was correct [12].

Criticism from inside the concept

Notably, Poulain — who co-created the term — has separately criticised how the concept was commercialised, describing Blue Zones projects as having become a lifestyle brand that emphasises individual responsibility while overlooking health disparities related to poverty, unemployment and education. That is a different objection from Newman's, and it comes from someone with no incentive to undermine the underlying science.

Where that leaves a reader

Not with a verdict, which is the honest answer.

A serious methodological challenge exists and has not been withdrawn. A serious peer-reviewed defence exists and has not been withdrawn either. The critique carries an Ig Nobel and considerable media reach but no journal publication after seven years; the defence carries peer review but is authored in part by someone with a two-decade investment in the concept. Both of those things are true at once.

For the biology that underlies ageing regardless of geography, see the hallmarks of ageing [13] and biological age vs chronological age.

What survives either way

Strip out the centenarian counts entirely and several Blue Zone habits still stand on independent evidence.

1. Social connection — the strongest survivor

A meta-analysis of 148 studies covering 308,849 participants found that people with stronger social relationships had a 50% greater likelihood of survival over follow-up (OR 1.50, 95% CI 1.42–1.59), an effect the authors described as comparable with well-established mortality risk factors [5]. The association was strongest for complex measures of social integration rather than simply living with someone.

Three of the nine Blue Zone habits — faith community, family first, right social circle — collapse into this single, well-evidenced finding. If you take one thing from the whole concept, take this one. It is free, and it does not depend on any birth certificate.

2. Plant-forward, legume-heavy eating

In the Adventist Health Study 2, a prospective cohort of 96,469 recruits with 73,308 in the analytic sample, vegetarian dietary patterns were associated with lower all-cause mortality compared with non-vegetarian patterns, with the association appearing more robust in men [6]. This is observational rather than randomised, and Adventists differ from the general population in many ways, but it is a large, carefully conducted cohort.

The mechanism most likely runs through fibre. UK adults are advised to aim for 30 g of fibre daily and most manage closer to 20 g [14]. Fermentable fibre from legumes feeds gut bacteria that produce short-chain fatty acids — the reason we cover butyrate supplements and Akkermansia separately. Beans are a cheaper route to the same endpoint. If you eat little or no animal produce, see vegan longevity supplements for the gaps worth covering.

3. Constant low-grade movement

No one in Ogliastra was doing structured cardio. They were walking up hills because that is where the sheep were. UK guidance is at least 150 minutes of moderate activity weekly plus muscle-strengthening on two or more days [15] — and incidental daily movement is a legitimate way to accumulate the first part.

Where the Blue Zones framing genuinely under-sells the evidence is resistance training. Preserving muscle mass and strength is one of the strongest determinants of functional independence in later life, and shepherding does not substitute for it in a UK office life. See zone 2 training for longevity and creatine for longevity.

4. Not overeating

The Okinawan practice of eating to roughly 80% fullness has the most direct supporting data of the dietary habits. Analysis of six decades of archived Okinawan population data found traditional intake of approximately 1,800–1,900 kcal per day, lifelong low BMI in the 18–22 range, little weight gain with age, and low mortality from age-related disease [9].

Importantly, this specific idea has support independent of Okinawa: the CALERIE randomised trial of two years of caloric restriction remains the strongest human evidence that energy intake influences measured biological ageing [7]. We cover it in how to lower your biological age. Periods without eating also relate to cellular recycling, covered in autophagy explained.

5. Purpose and downshifting

Ikigai in Okinawa, plan de vida in Nicoya. The evidence base for purpose in life as a mortality predictor is observational and vulnerable to reverse causation — people in poor health find it harder to maintain a sense of purpose — but the association is consistent across cohorts and the intervention costs nothing. Treat it as plausible rather than proven.

6. The wine claim, honestly

The "wine at five" habit is the weakest item on the list and the one most enthusiastically repeated. Evidence for a protective effect of moderate alcohol has weakened considerably as studies have improved their handling of former drinkers and confounding, and no UK health body recommends starting to drink for health reasons. UK guidance is to keep intake below 14 units weekly, spread over three or more days. This is one Blue Zone habit not to adopt on the strength of the story.

Loma Linda: the one with the paperwork

Loma Linda sits somewhat outside the demographic dispute. It is in California, with complete modern birth and death registration, no meaningful pension fraud incentive, and a population studied prospectively for decades through the Adventist Health Studies [6]. It is also, notably, not covered by the Austad and Pes defence, which addresses Sardinia, Okinawa, Ikaria and Nicoya [4].

What Seventh-day Adventists in that community do is not exotic: they largely do not smoke, largely do not drink, eat vegetarian or near-vegetarian diets, observe a weekly day of rest, and maintain dense community ties. The associated mortality advantage is measurable in properly registered data [6].

That is the tell. When record-keeping is not in question, what remains is not a mystery to be decoded — it is standard public health advice, followed unusually consistently by a whole community over decades. The most useful lesson of the Blue Zones may simply be that adherence, not secrets, is the variable.

What the Blue Zones do not support

We sell supplements, so this section matters. Nobody in Ogliastra in 1890 was taking anything. The Blue Zones provide no support whatsoever for supplementation as a longevity strategy, and any brand invoking them to sell you a capsule is making an argument the source material does not contain.

Compounds like NMN, urolithin A and taurine have to stand or fall on their own randomised evidence, which is early and mixed. That case is made — with its limitations — in our NMN benefits, side effects and dosage pillar, our taurine for longevity piece, and our sceptical round-up of longevity supplements that probably don't work. If you want the honest version of the NMN debate specifically, read is NMN a scam?

The one legitimate supplement lesson runs the other way. A Blue Zone-style diet in a UK climate creates predictable gaps: NHS guidance advises everyone in the UK consider 10 µg of vitamin D daily in autumn and winter [16], and plant-forward eaters need to attend to B12, omega-3 and creatine. That is deficiency correction, not longevity magic. See the minimal supplement stack, the cheap longevity stack and the longevity stack overview.

A UK version that actually works

Translating the defensible parts into a British context, in rough order of evidence strength.

Age-specific adjustments are covered in your 30s, women over 40 and men over 50. If your schedule is the obstacle, see supplements for shift workers.

How to measure whether it is working

There is an irony worth noting. The Blue Zones' central metric — how many people reached 100 — is the number now under dispute. Use measures you can verify yourself.

A single panel such as the Full Body MOT Health Check or the Welzo Well-Human advanced blood test covers most of the blood markers at once. On realistic timescales, see how long supplements take to work.

When to speak to a doctor

Speak to your GP before making significant dietary changes if you have diabetes, kidney disease, or take medication affected by diet — including warfarin, where vitamin K intake from leafy greens matters directly. A sharp increase in fibre can also cause problems if you have inflammatory bowel disease or a history of bowel obstruction, so increase gradually.

Speak to your GP before starting a new exercise programme if you have a heart condition, chest pain on exertion, uncontrolled blood pressure, or have been inactive for a long period. Do not begin deliberate calorie restriction without advice if you are underweight, pregnant, breastfeeding, older and losing muscle, or have any history of disordered eating.

Seek prompt medical assessment rather than pursuing a lifestyle protocol if you have chest pain, breathlessness at rest or on mild exertion, unintended weight loss, or persistent unexplained fatigue. A raised blood pressure or HbA1c result belongs with your GP, where the treatments have far stronger evidence than anything in this article.

Frequently asked questions

What are the Blue Zones?

Five regions identified as having unusually high concentrations of people aged 100 or over: Ogliastra in Sardinia, Okinawa in Japan, Ikaria in Greece, the Nicoya Peninsula in Costa Rica, and Loma Linda in California. The term was coined by demographer Michel Poulain and physician Gianni Pes while validating Sardinian longevity claims, published as the AKEA study in 2004 [8], and was later expanded and popularised by Dan Buettner.

Have the Blue Zones been debunked?

Challenged, not settled. Demographer Saul Justin Newman won the first Ig Nobel Prize in Demography in 2024 for arguing that extreme-age records cluster where birth certificates are missing and poverty is high, that only around 18% of validated supercentenarians have a birth certificate, and that Sardinia, Okinawa and Ikaria have shorter life expectancy than their national averages [1,2]. His paper remains unpublished in a peer-reviewed journal [3]. In December 2025, Austad and Pes published a peer-reviewed reply in The Gerontologist defending the age-validation methods used [4]. The argument is live; the underlying lifestyle advice is not affected either way.

Is the Newman paper peer-reviewed?

No. It was posted as a preprint in 2019 and updated in 2020 and 2024, and as of May 2026 had not been accepted by a journal — Newman reported it had undergone nine rounds of review at BMJ Public Health [3]. His separate, peer-reviewed work correcting a Nature paper on limits to human lifespan does stand [1]. We flag preprint status in both directions as a matter of policy.

What do the Blue Zones researchers say in response?

That age validation does not rely on self-declaration but on multiple independent written records — birth, baptismal, marriage, military and death registers — cross-checked against each other, meeting prevailing standards in gerontological demography [4]. Buettner separately argues that his work concerns people aged 90 and over rather than supercentenarians, and that regional crime and poverty statistics reflect Sardinian cities rather than the rural villages in question [11].

Why does poverty predict claims of extreme old age?

On Newman's account, because it creates both opportunity and motive: weak record-keeping produces clerical errors that inflate recorded ages, and where pensions depend on someone being alive, families have a financial incentive not to register a death [1]. Japan's 2010 audit of family registries found around 230,000 recorded centenarians who could not be accounted for [10].

What is the Power 9?

Dan Buettner's nine shared habits: natural movement, purpose, downshifting from stress, the 80% rule, a plant-slanted diet, moderate wine, faith community, family first, and a supportive social circle. Three of the nine are essentially the same thing — social connection — which happens to be the best-evidenced item on the list [5].

Which Blue Zone habit has the strongest evidence?

Social connection, comfortably. A meta-analysis of 148 studies covering 308,849 people found a 50% greater likelihood of survival among those with stronger social relationships, an effect the authors described as comparable with established mortality risk factors [5].

Is the Blue Zones diet worth following?

The plant-forward, legume-heavy pattern is well supported independently of the Blue Zones. Vegetarian dietary patterns were associated with lower all-cause mortality in the Adventist Health Study 2, a cohort of over 73,000 people [6]. In a UK context, mind vitamin D in autumn and winter [16], and B12, omega-3 and creatine if you eat little animal produce.

Do people in Blue Zones take supplements?

No. Traditional Blue Zone populations took nothing. The concept offers no support at all for supplementation as a longevity strategy, and compounds like NMN or urolithin A must be judged on their own randomised evidence — see longevity supplements that probably don't work. The one legitimate exception is correcting predictable UK deficiencies, which is a different argument entirely.

What should I actually take from the Blue Zones?

Four things that do not depend on the demographic dispute being resolved: build one recurring social commitment into every week [5], eat legumes and fibre most days [6,14], move throughout the day and add two resistance sessions [15], and stop eating before you are full — provided restriction is appropriate for you [7,9]. Everything else is optional, and the supplements are not part of the story at all.

References

1. UCL Institute of Education. UCL demographer's work debunking 'Blue Zone' regions of exceptional lifespans wins Ig Nobel prize. September 2024. https://www.ucl.ac.uk/ioe/news/2024/sep/ucl-demographers-work-debunking-blue-zone-regions-exceptional-lifespans-wins-ig-nobel-prize
2. Newman SJ. Supercentenarian and remarkable age records exhibit patterns indicative of clerical errors and pension fraud. bioRxiv 704080. Preprint — not certified by peer review. https://doi.org/10.1101/704080
3. Wood S, Topol E. Are 'blue zones' real? A science and wellness industry clash. STAT, May 2026. https://www.statnews.com/2026/05/04/are-blue-zones-real-new-scrutiny-longevity-hot-spots/
4. Austad SN, Pes GM. The validity of Blue Zones demography: a response to critiques. The Gerontologist. 2025;65(12):gnaf246. https://academic.oup.com/gerontologist/article/65/12/gnaf246/8381533
5. Holt-Lunstad J, Smith TB, Layton JB. Social Relationships and Mortality Risk: A Meta-analytic Review. PLoS Medicine. 2010;7(7):e1000316. https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1000316
6. Orlich MJ, Singh PN, Sabaté J, et al. Vegetarian dietary patterns and mortality in Adventist Health Study 2. JAMA Internal Medicine. 2013;173(13):1230–1238. https://pubmed.ncbi.nlm.nih.gov/23836264/
7. Waziry R, Ryan CP, Corcoran DL, et al. Effect of long-term caloric restriction on DNA methylation measures of biological aging in healthy adults from the CALERIE trial. Nature Aging. 2023;3(3):248–257. https://www.nature.com/articles/s43587-022-00357-y
8. Poulain M, Pes GM, Grasland C, et al. Identification of a geographic area characterized by extreme longevity in the Sardinia island: the AKEA study. Experimental Gerontology. 2004;39(9):1423–1429. https://doi.org/10.1016/j.exger.2004.06.016
9. Willcox BJ, Willcox DC, Todoriki H, et al. Caloric restriction, the traditional Okinawan diet, and healthy aging: the diet of the world's longest-lived people and its potential impact on morbidity and life span. Annals of the New York Academy of Sciences. 2007;1114:434–455. https://pubmed.ncbi.nlm.nih.gov/17986602/
10. Agence France-Presse. The secret to living to 110? Bad record-keeping, researcher says. Reporting Newman's Ig Nobel address and the Sogen Kato case. https://gulfnews.com/world/europe/the-secret-to-living-to-110-bad-record-keeping-researcher-says-1.1734090345148
11. Greek Reporter. Blue Zones founder defends the concept's validity amid criticism. January 2025 — Dan Buettner's response, including his statement that his work concerns people aged 90 and over rather than supercentenarians. https://greekreporter.com/2025/01/17/blue-zone-founder-defend-concept-validity-impact/
12. Science. Do 'blue zones,' supposed havens of longevity, rest on shaky science? https://www.science.org/content/article/do-blue-zones-supposed-havens-longevity-rest-shaky-science
13. López-Otín C, Blasco MA, Partridge L, Serrano M, Kroemer G. Hallmarks of aging: An expanding universe. Cell. 2023;186(2):243–278. https://www.cell.com/cell/fulltext/S0092-8674(22)01377-0
14. NHS. How to get more fibre into your diet. https://www.nhs.uk/live-well/eat-well/digestive-health/how-to-get-more-fibre-into-your-diet/
15. NHS. Physical activity guidelines for adults aged 19 to 64. https://www.nhs.uk/live-well/exercise/exercise-guidelines/physical-activity-guidelines-for-adults-aged-19-to-64/
16. NHS. Vitamin D — Vitamins and minerals. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/

All product photography in this article is owned by Welzo and served from the Welzo media library. Research positions correct at the time of publication.