What Is a Blue Zone? The 5 Places People Live Longest

Where the idea came from

In the early 2000s, Pes and Poulain mapped villages in Sardinia with exceptionally high numbers of men reaching 100 and drew a blue circle around them on a map. Journalist Dan Buettner later worked with researchers to find other places with similar patterns, and the label stuck.

The five blue zones

Each place sits in a very different culture and climate, which is what makes the shared habits interesting.

• Okinawa, Japan: plant-heavy eating, strong social circles called moai, and a sense of purpose.
• Ikaria, Greece: a Mediterranean diet, herbal teas, afternoon rest and long social evenings.
• Sardinia, Italy: shepherd communities, daily walking in hilly country and tight family ties.
• Nicoya Peninsula, Costa Rica: a clear 'plan de vida', beans and corn, and strong family bonds.
• Loma Linda, California: a Seventh-day Adventist community with a plant-leaning diet, a weekly day of rest and faith-based fellowship.

What they have in common

Researchers group the shared habits into nine themes, often called the Power 9: natural movement, purpose, stress downshifting, eating until 80% full, a plant-leaning diet, moderate drinking where cultural, belonging, putting family first and choosing supportive friends.

What the science can and cannot say

Blue zone findings are observational. They describe what long-lived people do, not proof that each habit causes longer life. Some researchers have also questioned how well birth records in a few regions can be verified, so treat any headline numbers with care.

The habits themselves, though, line up with decades of mainstream research on diet, activity, sleep and social connection.

How to use this

You do not need to move to Sardinia. Pick one habit, such as a daily walk with a neighbour or a plant-based dinner three times a week, and make it part of your routine.

How researchers decide a place is a blue zone

Calling a region a blue zone is not a marketing label; it rests on demography. Researchers look for populations where an unusually high share of people reach their 90s and 100s, where life expectancy is high and where the numbers can be verified with birth records, church registers and census data. In Sardinia, the team counted centenarians village by village and compared them with the rest of the island, finding a cluster in the highland communities of Nuoro province.

Verifying ages is the hardest part. In places where records were lost to wars, fires or poor registration, claims of extreme age can be inflated. Careful studies check documents against family histories, and some blue zones, such as Sardinia and Okinawa, have far stronger documentation than others. This is why serious writers describe blue zones as areas of high longevity with varying levels of confirmed data, not as a guarantee that everyone lives to 100.

Why these five, and why they feel so different

Okinawa is a subtropical island chain, Ikaria a windy Aegean rock, Sardinia a mountainous Mediterranean island, Nicoya a tropical peninsula and Loma Linda a suburban American community. They differ in language, religion, climate and income. That diversity is the point. If a single food, gene or climate explained longevity, the places would look alike.

What they share is a pattern of daily life: people are regularly active without exercising, they eat mostly plants, they have a sense of purpose, they rest and celebrate, and they are embedded in family and community. Each place expresses the pattern in its own way, through sweet potatoes, herbal tea, sourdough bread, beans and tortillas, or a weekly day of rest.

What blue zone residents do not do

They rarely count calories, follow diets, take handfuls of supplements or spend hours in gyms. They do not smoke much, they do not live on processed snacks and sugary drinks, and they do not sit all day. Their environments make the healthy choice the easy one: the market sells vegetables, the village is walkable, friends live nearby, and meals are shared.

This is encouraging for the rest of us. It suggests that designing your surroundings, rather than relying on willpower, is the most reliable way to build healthy habits.

A short history of the idea

The story began with a map. In the late 1990s and early 2000s, Italian researcher Gianni Pes and Belgian demographer Michel Poulain tracked down every centenarian in Sardinia and marked the villages on a map with a blue pen. The cluster in the highlands became known as the blue zone. Later, journalist Dan Buettner joined demographers and traced similar clusters around the world with support from National Geographic, producing books, documentaries and community programmes that spread the name.

Since then the concept has inspired city-wide health projects, restaurants, supermarkets and even policy discussions on how to design places that make healthy living easier.

What a blue zone is not

A blue zone is not a miracle cure, a diet plan or a tourist spa. It is not a guarantee that every resident lives to 100, and it is not static: as places modernise, habits change and longevity advantages can fade, as has happened among younger Okinawans. The most useful way to think about blue zones is as natural experiments that show what ordinary life can look like when it supports health.