Credit: Getty Images Japanese diet Fish, tofu, edamame, and vegetables are staples of the traditional Japanese diet, and Japanese people have been credited with having some of the world's longest lifespans. (Residents of Okinawa, a long-life blue zone, eat 60 to 120 grams of soy a day compared to practically zero grams for the average American.) Many experts believe that following the Japanese style of eating has weight-control as well as longevity benefits: As the book title says, "Japanese Women Don't Get Old or Fat."