In Sardinia, Okinawa, Ikaria, the Nicoya Peninsula of Costa Rica, and Loma Linda, California, an unusual share of residents live into their 90s and beyond. These are the so-called Blue Zones.
In Ikaria, residents reach age 90 at two and a half times the American rate, while the Seventh-day Adventist community in Loma Linda outlives the average American by roughly 7 to 10 years.
The interesting part is not the geography. It is that five isolated populations, on different continents and speaking different languages, share a recognizable set of daily habits. Researchers who mapped the pattern boiled it down to a short list.
Below are five of the most consistent habits, and an honest note at the end on what the evidence actually shows.
Also read: How a week without alcohol can affect your sleep
A plant-forward plate anchored by beans
Blue Zone diets are about 95 percent plant-based, with meat eaten on average around five times per month in small portions.
Legumes do the heavy lifting. Researcher Dan Buettner's team describe beans as "the cornerstone of most centenarian diets", and the group's dietary guidelines recommend at least a half cup of cooked beans daily. Leafy greens, whole grains, and nuts fill most of the rest of the plate.
Movement built into the day
There are no CrossFit boxes in Ikaria. Blue Zone residents do not join gyms; movement is threaded through the day through gardening, walking as everyday transport, cooking from scratch, and manual chores done without power tools.
Harvard-affiliated researchers who reviewed the pattern note that what matters is staying active in itself, not any particular exercise routine.
Also read: Struggling with constipation? Doctors recommend trying this fruit group
A reason to wake up
Okinawans call it ikigai. Costa Ricans on the Nicoya Peninsula call it plan de vida.
Either way it means having a clear reason to get out of bed. Buettner's team estimates that a defined sense of purpose is associated with up to seven additional years of life expectancy, a figure they draw from long-running cohort studies of older adults.
A tight-knit circle
Social connection may be the least glamorous habit on the list, and one of the most consistent. In Okinawa, groups of five friends called moai commit to each other for life.
Faith community matters too. In the original Blue Zones interviews, all but five of 263 centenarians belonged to a faith-based community, and attending services roughly four times a month was linked to 4 to 14 extra years of life expectancy in the underlying research.
Also read: Serious surgical error: Surgical scissors found inside woman's abdomen months after procedure
Time to downshift
Chronic stress drives the low-grade inflammation that accelerates age-related disease. Blue Zone residents build in daily rituals to slow down.
Okinawans pause to remember ancestors, Adventists pray, Ikarians nap, and Sardinians linger over happy hour with friends.
The specific ritual matters less than the fact that stress relief is baked into the day.
What the evidence can, and cannot, show
Here is the honest bit. The Blue Zones data is observational. Nobody has run a randomized trial that assigns thousands of adults to gardening, legumes, and lifelong friendship circles for 40 years.
Also read: Study finds 81 percent of toddler food products are ultra-processed
Harvard nutrition researcher Walter Willett, one of the most cited epidemiologists alive, has cautioned that "by itself, the Blue Zone theory is not regarded as strong science."
The picture got messier in September 2024, when UCL demographer Saul Justin Newman won an Ig Nobel Prize for research arguing that many extreme-age records in Blue Zone regions may reflect missing birth certificates, clerical errors, and pension fraud rather than true biological longevity. Buettner's team has pushed back, and the dispute is still active.
None of that unravels the underlying habits. Plant-forward eating, daily movement, a defined sense of purpose, and strong social ties are each supported by decades of independent research on healthy aging.
The Blue Zones may or may not turn out to be as extreme as first advertised. The habits still hold up on their own merits, and none of them require living on a Greek island to try.
Also read: Blurred vision can be a sign of type 2 diabetes
Anyone with existing health conditions should talk to their doctor before overhauling their diet or activity level.