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When evolution molds a genepool it does so with inbuilt assumptions, one the assumptions is exposure to some level of sunlight. Deviating from these assumptions would result in undefined behavior (in the CS sense) for individuals.

If an individual cannot or will not expose themselves to sunlight, taking D3 is probably the best option they have.

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In my opinion, these are the best options if you want to be healthy like people who get sun exposure (in order from most to least likely to work):

1. Act like a person who is exposed to sunlight. Walk, run, don’t spend every day at a bed, couch, or desk.

2. Expose yourself to sunlight.

3. Supplement vitamin D.

The last time I took a casual glance at studied, it seemed that vitamin D deficiency was correlated with multiple health conditions; however, vitamin D supplementation had not clearly prevented or reversed those conditions. That is, this isn't like scurvy.

A common hypothesis was that vitamin D status was a proxy for sun exposure and not a complete explanation for those health problems.

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