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.
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It is difficult to compare hunter gatherer societies to early agrarian societies and modern society, because of vulnerability to starvation, different selection pressure and almost non existent health care.
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I agree. But your original tweet said long life was a result "of an environment that remained stable for many generations", which is more true of hunter gatherers than of modern society. So your hypothesis needs refining.
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I don't think many senescence researchers believe your first sentence applies to humans (esp. in light of research on resource / expertise transfers from elders). And your second sentence seems rather far fetched (what about evolution of phenotypic plasticity?).
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