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Lack of the low-level stress of noise pollution, danger of attack/need to conform, less chemical/petrol pollution, and no temptation of fast-food etc may help too.

This. Much of our sickness comes from animals we co-habit with, and humans spreading/incubating germs. Staying away from humans and not bedding with animals is the best way to avoid getting sick.

That + living outdoors and on your own turns you more resilient. Improves the constitution, so to speak. Like how you're less bothered by the cold the more time you spend outdoors.

> That + living outdoors and on your own turns you more resilient.

Isn't this just a case of survivor bias? In that the people it kills, well, they aren't around to be "more resilient"...

In extreme environments, sure. My understanding is that this island is temperate, so it's more like camping at the lake than braving the desert or the taiga.