[franze]

In modern (record keeping) times it - might - dissolved due to diet changes.

Nobody disputed that a healthy diet is healthy. And a healthy lifestyle is healthy. Whereby lifestyle is such a broad word that its in fact meaningless.

Maybe the record keeping in Okinawa was correct.

If you look for outliers, you will find outliers.

If you look for correlation, you will find correlation.

Does not mean they are the causation for all the outliers.

So maybe Okinawa just had a lucky streak, which is now over.

[rafaelero]

The fact that these outliers share similar habits should put your concerns over "extraordinary" factors at bay.

[franze]

but how many communities exist with the same behaviour/setting/factors configuration but are not an centaurian-outlier.

basic science, do not look for verification, but falsification