Blue Zones: where (and why) people live longer
There are five corners of the world where reaching 100 has, for years, been far more common than anywhere else on the planet. They've been studied as an instruction manual for living longer and better. Today we know the story has more nuance than it seemed.
⚠️ Important notice: this is informational content, NOT medical advice or a promise. Living longer depends on genetics, public healthcare and luck — factors you don't fully control. What follows are habits with solid backing in independent research, not a magic formula.
The 5 places
In 2004, demographer Michel Poulain and National Geographic explorer Dan Buettner circled, in blue ink on a map, the areas of Sardinia with the most centenarians. That's where the name comes from. Over the years, the team pointed to four more regions of the world with an unusual concentration of people reaching 90 and 100 in good health.
Okinawa
Japan
The world's longest-lived women, according to the original data. Home gardens, fermented soy and ikigai: the reason you get up each morning.
Sardinia (Ogliastra)
Italy
The only zone with as many male centenarians as female. Shepherds who walk several kilometres a day over mountainous terrain, and a very strong family culture.
Nicoya
Costa Rica
Their "plan de vida" (the local ikigai) and very close family ties. Also the case most singled out by the later review of demographic errors.
Ikaria
Greece
The island where, according to Buettner, "people forget to die". Daily naps, a Mediterranean diet and a very relaxed social clock.
Loma Linda
California, USA
A Seventh-day Adventist community with almost a decade more life expectancy than the US average: a vegetarian diet, a weekly day of rest and a very active faith community. The case with the best independent scientific backing.
The 9 habits they share (Power 9)
Whatever the final verdict on the exact longevity numbers turns out to be, Buettner and his team interviewed hundreds of older people and found nine things the five zones had in common, beyond diet or genes. You don't need to move to a Greek island to apply them.
Move naturally
They don't go to the gym: their daily life forces them to walk, dig the garden or knead bread without thinking about it.
👉 Look for positive friction: take the stairs, park further away, walk while you're on the phone.
Have a purpose
Okinawans call it ikigai; in Nicoya, plan de vida. Knowing why you get up each morning is linked to several extra years of life.
👉 Ask yourself what you'd do for free, even if nobody paid you for it.
Downshift
Every zone has a daily ritual for shedding stress: the nap in Ikaria, aperitif hour in Sardinia, praying in Okinawa.
👉 Pick a fixed time of day just to switch off, even if it's only 10 minutes.
The 80% rule
In Okinawa they say "hara hachi bu" before eating: a 2,500-year-old reminder to stop eating at 80% full, not 100%.
👉 Eat more slowly and stop once you're no longer really hungry, even if there's still food on the plate.
Plant slant
Legumes are the backbone of almost every centenarian diet studied. Meat shows up a few times a month, in small portions.
👉 Make legumes the base of two or three meals a week.
Wine at 5 (except Loma Linda)
Almost every zone drinks alcohol moderately and with company —except the Loma Linda Adventists, who don't drink at all. The key seems to be the social ritual, not the alcohol itself.
👉 If you drink, keep it light and social. If you don't, keep the social ritual and skip the glass.
Belong
The vast majority of centenarians interviewed belonged to a faith community. Attending regular gatherings is linked to living longer, whether or not you're a believer.
👉 Find any regular group —choir, club, hiking— that gives you a sense of belonging.
Loved ones first
Living close to parents or grandparents, keeping a stable partner and giving real time to children come up again and again in the interviews.
👉 Prioritise real time with the people you love, not just messages.
Right tribe
In Okinawa there are moai: groups of friends who commit to supporting each other for life. Your social circle spreads its habits to you more than you think.
👉 Surround yourself with people whose habits you'd like to catch.
The important nuance
In 2024, researcher Saul Newman received an Ig Nobel Prize for a study that points to something uncomfortable: the world's zones with the most supposed centenarians often coincide with places with poor birth-record documentation, pensions that reward overstating your age, or unreliable civil registries. In Nicoya, for example, a review of errors made the "blue zone" shrink dramatically, and its life expectancy went from leading the world ranking to sitting near the bottom.
Dan Buettner and Michel Poulain, the original researchers, reject Newman's conclusions —his study, in fact, remains unpublished in a peer-reviewed journal after several rounds— and argue their data was verified at the time by National Geographic. But, curiously, they themselves have since published studies showing that generations born in Nicoya or Okinawa after a certain date no longer live as long as earlier ones. Fraud or no fraud, the phenomenon seems to be fading.
The honest conclusion is this: we don't know for certain whether these five zones actually break world longevity records. What does have independent backing —outside this specific debate— is that their lifestyle habits (eating more plants, moving daily, having purpose and community) are linked to living better, as shown for example by the Loma Linda Adventist Health Study, which has followed tens of thousands of people for decades.
How to apply it without moving to a Greek island
Small changes, not a revolution. Pick one or two and turn them into a habit.
- 1Walk a little each day towards somewhere specific: work, the bakery, an errand.
- 2Add legumes to a couple of meals a week.
- 3Stop eating when you're no longer really hungry, not when the plate is empty.
- 4Set aside 10 minutes a day to do nothing productive.
- 5Meet up with the same people regularly, not just when it happens to come up.
- 6Write in one sentence what you get up for each morning. Revisit it every few months.
What I've based this on
None of this is a medical prescription: it's informational content grounded in Dan Buettner's original research and the scientific debate that followed, with both its sides.
- Buettner, D. & Skemp, S. (2016), Blue Zones: Lessons From the World's Longest Lived. American Journal of Lifestyle Medicine.
- Fraser, G. E. & Shavlik, D. J. (2001), Ten Years of Life: Is It a Matter of Choice? Archives of Internal Medicine — Adventist Health Study.
- UCL (2024) — El estudio de Saul Newman sobre las Zonas Azules, ganador del Ig Nobel de Demografía.
- STAT News (2026) — Are 'blue zones' real? A science and wellness industry clash.