Hara hachi bu | Habit Guide Hara hachi bu is a Confucian teaching that instructs people to eat until they are 80 percent full. Roughly, in English the Japanese phrase translates to, "Eat until you are eight parts (out of ten) full". Almost 29% of Okinawans live to be 100, about four times the average in western countries. They consume about 1,800 to 1,900 calories per day.