So-called Blue Zones, in addition to being cherry-picked for an agenda, are concentrated in regions with no birth certificates and short lifespans.
In other words, much of what's "known" about Blue Zones could be fraud.
"Surveying the ‘blue zone’ of Ikaria, Chrysohoou et al. observed that the oldest-old have... a 10% illiteracy rate, an average 7.4 years of education, and a 99% rate of smoking in men."
IOW not believable as a have for supercentenarians.
All of this is reminiscent of the cholesterol hypothesis: cherry-picked data used to support an agenda and that's become so embedded in theory and practice that no amount of data will convince the experts otherwise.
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"iron satisfies many of the conditions we might look for in a universally pro-aging substance. It accumulates with age; it is associated with many age-related diseases such as cardiovascular disease, cancer, and Alzheimer’s disease;"
"it catalyzes the formation of cellular junk molecules and helps to prevent their turnover; removal of iron from plasma may be rejuvenating; and people with lower levels of body iron – blood donors – have a lower mortality rate."
We know (according to the CDC) that 95% of those who died from Covid had at least one underlying health condition, such as obesity, hypertension, and diabetes