https://www.medrxiv.org/content/medrxiv/early/2024/09/06/2024.09.06.24313170.full.pdf

@LucH not crémieux, hope this is better source from your perspective:

https://www.independent.co.uk/life-style/blue-zones-netflix-ignobel-prize-b2642717.html

https://science.anu.edu.au/news-events/news/dr-saul-newman-has-uncovered-secret-living-110

It seems related to retirement pension fraud, where in some area they choose to not declare death of elders to continue to get money from pension.

This fraud is by far the most plausible explanation of blue zone such as okinawa or mediteranean longevity.

Charlatans took advantage of this phenomenon to promote diet program and make money with it.

https://www.cremieux.xyz/p/the-blue-zone-distraction