Sardinia is one of the world's 'Blue Zones.' People eat 'peasant food,' walk lots, and prioritize family over work

In most populations, women outlive men on average — in the US, women who live to over 100 outnumber men over 100 by six to one.

But in the Sardinian Blue Zone, the ratio is almost one to one, and there are almost ten times more centenarians per capita than in the US, according to the Blue Zones website.

In villages in a kidney-shaped region of the island, people regularly live to over 100, which Buettner says is partly because of their genes but also partly because of their traditional, healthy lifestyles.

People in Sardinia tend to eat a very traditional Mediterranean diet, which consists of mostly whole grains, vegetables, dairy products, and not much meat.

"The food is beans, greens, and whole grains," Buettner told NBC News in 2019. "They also eat a lot of bread and cheese, mostly Pecorino, and food from their garden."

He said it is essentially "peasant food," with simple, fresh ingredients, and meat reserved for Sundays and special occasions.

Many of the Sardinian dairy products that people on the island consume are made from goat's milk, which, as Insider previously reported, contains more protein than cow's milk and could help the body absorb other nutrients.

The diet of people in Sardinia is "maybe only twenty five percent" of the reason why they live so long, according to Buettner. Their lifestyles also contain lots of opportunities for what's known as incidental exercise.

Sardinia is a very mountainous island, with lots of steep hills, and people tend to walk more than they use their cars.

"They are getting low intensity and medium intensity exercise all the time. There are dozens of periods of physical exertion throughout the day, and people aren't driving for the most part; they're walking," Buettner said.

There are still lots of traditional shepherds in Sardinia, who walk more than five miles a day, according to Buettner. Walking is great for cardiovascular health and has been linked to increased longevity as well as a host of other health benefits.

Sardinians do drink alcohol, in moderation. Local wine, called Cannonau but otherwise known as grenache, is high in antioxidants, which have been associated with better cardiovascular health. Buettner suggested that the moderate drinking habits in Sardinia could also explain the lower levels of stress amongst men from the island.

Sebastian Piras, a photographer and filmmaker from Sardinia, told NBC: "there's a tradition of buying your friend a glass and then they buy you one and then someone else buys you one and the [cycle continues]."

It's worth noting that the World Health Organization says that there is no safe amount of alcohol that does not affect health.

Sardinians are big on community and family, like many Blue Zone communities are, and Buettner said that elders are celebrated in Sardinia.

Piras said: "Usually there will be two or three generations of a family living in the same household. The family connection is extremely tight, and there is [an effort] in keeping family together."

One 2017 study has suggested that looking after children may reduce grandparents' mortality, and having strong connections with others has been linked to longevity, no matter whether those relationships are friendly, familial, or between acquaintances.

People often come home from work to have lunch with family, and some people may not return to the office, Piras said.

"Generally, if you ask them their priorities, you will hear again and again that family is number one. And there's no option for loneliness; they're connected everyday, and rather than waking up thinking about how to advance in their career, they're waking up thinking about how their children, grandchildren and great grandchildren are thriving," he said.