In the search for the world's best diet, it makes sense to start where the oldest people live. Researchers have identified five blue zones – geographical regions where people are claimed to live longer than average. Much research has been done on the dietary and lifestyle habits within these zones, in the hope of finding the key to their inhabitants' longevity. The blue zones are: Okinawa, Japan; Sardinia in Italy; Nicoya in Costa Rica; Icaria, Greece; and a Seventh-day Adventist community located in Loma Linda, California.
