I'm surprised age and obesity aren't mentioned more in this article. It seems like both lead to less sun exposure and are also comorbid with heart disease, low

I'm surprised age and obesity aren't mentioned more in this article. It seems like both lead to less sun exposure and are also comorbid with heart disease, low vitamin D levels, etc. If obesity and age explains the low sun exposure (less likely to be sunbathing on beaches, etc.), the assumed causality is at least oversimplified if not outright mistaken. The evidence for a sunlight-triggered mechanism for the production of sunlight is interesting, though. I wish the article worked more to connect that finding to everything else.