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polymathwannabe comments on Open Thread, Apr. 27 - May 3, 2015 - Less Wrong Discussion
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I've been doing the same thing for ~40 minutes of daily peak sunlight, because of heuristics ("make your environment more like the EEA") and because there's evidence it improves mood and cognitive functioning (e.g.). The effect isn't large enough to be noticeable. Sunlight increases risk of skin cancer, but decreases risks of other, less-survivable cancers more; I'm not sure how much of the cancer reduction you could get from taking D3 and not getting sunlight. I guess none of that actually answers your question.
If you're white, you're no longer adapted to the ancestral environment where humans evolved.
Agreed, considering "EEA" to mean the African savannah. So for instance if your ancestry is European and you're currently living in California you don't need to spend very much time outside, and if you're dark-skinned and living at a high latitude you should try to get lots of sunlight.
Evolutionary selection pressures are strong enough that skin color of natives over the world corresponds to the level of sun exposure of various places.
Of course being indoors means that you get less sun then the environment for which evolution prepared you.