Punctuation is the name for marks used in writing. They are to help understanding and correct reading. These are some common punctuation marks used in English: . is a period or full stop.
In the past, less affluent Okinawans ate sweet potatoes. Lots and lots of sweet potatoes. Rice, especially white rice, was more expensive and was a bit of a status symbol: it was something consumed only by the wealthier folks.
In addition to eating healthfully, the Japanese also have different attitudes toward food than many Americans. In Okinawa, for instance, residents practice hara hachi bu or eight parts of 10: They stop eating when they are 80 percent full.