The Okinawa diet has a homepage at okinawadiet.com, and if you click on the link that leads to their information page, you will be provided with a list of facts.

It appears that the Okinawa diet does have quite a bit of success. It is due to the large amounts of rice, vegetables, and fruits, and little amounts of protein.

The Okinawa diet doesn't provide you with a list of foreign foods to eat. Instead they rebuilt the food pyramid to include their own diet version. You would still be eating the same foods as you would be with a normal food pyramid, just more broken down. The following website refers you to the food section of the Okinawa diet which explains what you would eat in further detail: http://okinawa-diet.com/okinawa_diet/okinawa_diet_food_pyramid.html.

沖縄県 (okinawa-ken), which is "Okinawa Prefecture", omitting the last Kanji 県 (ken) makes it 沖縄 (okinawa).

Okinawa is an island