> No different than how there was a period of time where UV light was considered this evil to avoid, and now we know it's actually pretty critical to get sunlig

> No different than how there was a period of time where UV light was considered this evil to avoid, and now we know it's actually pretty critical to get sunlight in moderation (and completely avoiding UV causes its own issues). The real issue isn’t that we “didn’t know” sunlight has benefits, we’ve known that for ages. Just as we know too much sun has downsides. The problem is that people can’t (or won’t) tailor advice to their own context. What counts as “moderation” in one place looks very different in another. That’s why I’m healthy and look a decade younger than my age, while my younger sister already looks older than me and has had five skin cancers cut out. Where I live, 5–10 minutes of sun a day is plenty. Where you live, you might need hours. So “avoid the sun” means radically different things depending on where you are.