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(MODEL RELEASED) Keiko prepares a meal with her husband Takeo Matsuda in the kitchen of their home. (Supporting image from the project Hungry Planet: What the World Eats.) The Matsuda family of Yomitan Village, Okinawa, is one of the thirty families featured, with a weeks' worth of food, in the book Hungry Planet: What the World Eats. 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.