I wonder if people who fly frequently live longer than those who don’t. They likely get more radiation than people who don’t. And I’ve heard that in small amounts, radiation functions as a form of homeosis, increasing longevity.
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No evidence I know of for radiation but there's interesting studies on possible beneficial effects of oxidative stress! In the heart, ox stress happens during exercise and is associated with increased expression of cardioprotective genes. (Source: did my PhD in cardiac aging)
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I just finished Nick Lane’s ‘The Vital Question’ and it covered this right down from the individual cell’s point of view. Really enjoyed it. https://www.goodreads.com/book/show/26530386 …
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