Okinawan/Uchinanchu diet is different than Yamato (mainland Japanese) diet as they didn’t eat as much fish. Some theorize because of the extremely hot/humid weather they didn’t have as much fish as the Japanese.

Another thing about Okinawan diet is “Hara Hachi Bu” eat until you are 80% full which implies lower caloric intake.

Interesting enough less eating = longer life according to some researcher but there are trade offs.

Okinawans have a shorter average height and the older generations even more so.

Veggies, legumes are staples. I think of Goya which is bittermelon, kabocha (winter squash), etc. as well as Okinawan sweet potatoes. Less rice than the Japanese counterparts though. Some grains.

Alcohol and for the older generations ocassional pork (nowadays it’s a lot more meat). Interesting even enough in the late 1800s, Japanese didn’t really eat pork but Okinawans did and Okinawans eat all the different parts of pork, feet, ears, organs. Sources say less than 1% of diet.

Also: Okinawa has a unique culture, language, diet that is different than the average Yamato Japanese and was it’s own separate kingdom until the 1600s and had its own king until the late 1879.