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The two camps agree on four blue zones—Sardinia, Okinawa, Nicoya, and Ikaria—but there are some differences.

But two places did make the cut: the peninsula of Nicoya in Costa Rica in 2007, and the island of Ikaria in Greece in 2008.

“Live to 100: The Secrets of the Blue Zones,” explores Loma Linda, along with small communities in Okinawa, Sardinia and Costa Rica, as well as the Greek island of Ikaria.

The blue zones — which were named as such when longevity researchers Michel Poulain and Giovanni Mario Pes circled regions of Sardinia on the map with blue ink — are generally thought to include Sardinia as well as Nicoya, Costa Rica; Ikaria, Greece; Okinawa, Japan; and Loma Linda, California.

“I remember in Ikaria, somebody shook my hand, and I felt it for two days after it was so strong. There is this physical activity that is part of their daily life.”