Hypothesis: longevity in the Blue Zones is not so much a function of good air and nutrition but of an environment that remained stable for many generations. Frequent change in environmental factors like diet increases need for adaptation, so fertility and aging happen earlier.
that's a really interesting hypothesis. testable too! find people who come from a less long-lived group but immigrated to a Blue Zone as children and see if they gain the longevity.
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Anecdotically, people leaving the Blue Zones may often get seriously ill and recover once they move back.
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