Sleepy healthful Ogimi Village, Okinawa, is home to many centenarians. Hara hachi bu: "eat only until 80 percent full," say older Okinawans. The island has been the focus in recent years of researchers trying to discover why a disproportionately large number of Okinawans are living to age 100 or more. (Supporting image from the book Hungry Planet: What the World Eats.)