Blue Zones and the Lessons of a Long Life

In the early 2000s, demographers Gianni Pes and Michel Poulain were studying centenarians in Sardinia. As they mapped the villages with the highest share of people living past 100, they circled them on the map in blue ink. The cluster where such villages were densest they simply called a "blue zone." Later, journalist Dan Buettner and National Geographic tracked down several more places like it around the world, and the term "blue zones" entered the mainstream.

What makes them so valuable? Not a single magic food — but the fact that five utterly different cultures, with different diets, languages, religions and climates, turned out to share a common set of habits. That is a rare gift for science: not a two-year lab experiment, but the lived experience of whole communities, where a long and healthy life is not the exception but the norm, handed down from one generation to the next.

Below we'll go through each part in turn: where these zones are and what the numbers look like, which nine habits unite them — and, just as importantly, why the concept is fairly criticized. Because drawing inspiration from the blue zones is useful; taking every claim on faith is not.

Five places where people live the longest

There are five classic blue zones. Each has its own history and its own numbers, but the underlying story is the same: people here don't just reach old age — they stay active and engaged deep into it.

• Okinawa (Japan). Perhaps the best-known zone. Local women have historically ranked among the longest-lived in the world, and the density of centenarians is estimated to be several times the average. Heart disease and certain cancers are markedly rarer. The plate is built on sweet potato, tofu, vegetables and sea greens — and there's a special role for moai, lifelong circles of friends who support one another through good times and bad.
• Sardinia (Italy). The mountain villages of the Barbagia are where the whole concept began. Its signature trait: male centenarians are almost as common as female ones (roughly 1:1), whereas worldwide men living past 100 are on average about five times rarer than women. The explanation is linked to genetic isolation and a shepherding way of life — daily treks of many miles across the hills.
• Ikaria (Greece). An Aegean island nicknamed "the place where people forget to die." Researchers estimate the share of residents reaching 90 is several times the European average, while rates of dementia are notably lower. The foundation is Mediterranean food, herbal teas, afternoon naps and a pointedly unhurried rhythm of life, where almost no one watches the clock.
• Nicoya (Costa Rica). A peninsula with one of the world's lowest rates of middle-age mortality and a high share of male centenarians. The diet is simple and cheap — corn, beans, squash. But researchers highlight plan de vida just as much as the food: a clear sense of why you get up in the morning and who still needs you.
• Loma Linda (USA). The only zone in a wealthy Western country — a community of Seventh-day Adventists in California. According to decades of research, they live on average several years longer than other Americans (by some estimates, up to 7–10 years). The recipe is prosaic: vegetarianism, no alcohol or tobacco, a weekly day of rest, and a strong faith community.

Nine shared habits (the Power 9)

Comparing all five regions, Buettner distilled nine traits that recur everywhere — dubbed the "Power 9." The most interesting finding isn't the list itself but its makeup: nearly half the items have nothing to do with food, and everything to do with movement, rest, meaning and the people around you.

• Move naturally. Not the gym and not the treadmill, but movement woven into daily life: the garden, the yard, walking on foot, working with your hands. Long-lived people move all day without ever thinking of it as exercise.
• A sense of purpose. In Okinawa it's called ikigai; in Nicoya, plan de vida. A simple but powerful question: what do you get up for in the morning? Those who know the answer have a lower risk of dying in the years ahead.
• Downshift. Even the long-lived have stress — but they also have daily rituals that release it: the afternoon nap in Ikaria, prayer among the Adventists, an hour remembering ancestors in Okinawa.
• The 80% rule. Okinawa's hara hachi bu — stopping when you're about 80% full rather than stuffed. The gap between "satisfied" and "overfull" is exactly that small daily calorie deficit; in spirit it's a gentle cousin of intermittent fasting.
• Lean plant-based. The diet is built on legumes, vegetables and whole grains. Meat is eaten, but rarely and in small amounts — on average a few times a month, not every day.
• A little wine (where it's the custom). In some zones, a glass of wine with friends over dinner. What matters isn't the drink so much as the moderation and the company. In Loma Linda there's no alcohol at all — and that works too, so the recipe isn't universal.
• Belonging. Almost all long-lived people belong to some community — religious or neighborly. Regular participation in the life of a group is associated with extra years of life.
• Family first. Several generations live together or nearby, elders aren't left to grow old alone, and children are raised by the whole extended family.
• The right tribe. Healthy habits are contagious: if your inner circle eats simply, moves a lot and doesn't drink, you quietly end up doing the same.

Honestly: where the concept is criticized

The blue zones are a beautiful, inspiring idea, and in many ways they line up with solid science. But there's a weak spot worth knowing about: this is observation, not a controlled experiment. And observations are easy to mistake for proof.

The loudest criticism targets the age records themselves. Demographer Saul Justin Newman showed that many regions with "extreme longevity" have suspiciously high rates of incomplete or inaccurate birth records. Where reliable registration is absent, some of those centenarians may be the product of clerical errors — or even pension fraud — rather than biology. Newman's work was awarded an Ig Nobel Prize in 2024; documented cases range from tens of thousands of Italians drawing pensions while dead, to a large share of Costa Rica's oldest residents having overstated their age, to roughly a quarter of a million "missing" centenarians in Japan. None of this dismisses the phenomenon entirely, but it does demand caution about the precise numbers.

Second is the classic trap of "correlation isn't causation." We can see that long-lived people move a lot and eat plants, but we can't strictly prove that's the cause. Genes, clean mountain air, the natural selection of past generations and dozens of other tangled factors may all play a role, and they're hard to pull apart.

And third, the practical point. You can't simply switch a blue zone on at home: you can't transplant a mountain Sardinian community, with its whole way of life, into a big city. What travels are the principles — move more, eat simpler, protect your connections, have a purpose — not the scenery. Whether they're working for you is something an estimate of your biological age can help show.

Frequently asked questions