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The Okinawa diet commonly touted for longevity was primarily sweet potato, and only 1% fish.

https://en.m.wikipedia.org/wiki/Okinawa_diet

Unfortunately, I now have to have doubts about any Japanese longevity associations after many centenarians were found to have been secretly dead. Families were collecting the death benefits and pretending the person was still alive.

https://www.theguardian.com/world/2010/sep/10/japenese-cente...

So the secret to longevity really is generous social benefits ... and not checking too carefully if the beneficiary is still alive.

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