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A comment on Adequate Vitamin D Levels Cuts Risk of Dying from Covid-19 in Half, Study Finds. Parent comment

Re:Adequate Vitamin D Levels Cuts Risk of Dying from Covid-1... by kennywinker on Sunday September 27, 2020 @04:48PM (#24610027)
not op, but I don't think that's what's being implied. Just that there might be other benefits from spending time in the sun - so a study where the only variable is that one group got injections of vitamin D means that the difference is caused by the vitamin D not any of the other things that might be associated with high vitamin D levels (time in the sun, diet, etc).
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Re:Adequate Vitamin D Levels Cuts Risk of Dying from Covid-1... by bobthepanda on Sunday September 27, 2020 @08:30PM (#24611555)
The correlation observed for many things associated with vitamin D, is that healthy people spend more time outside than unhealthy people, not that being out in the sun is an inherently healthier activity. E.g. runners/athletes spend more time outside than those who are not, and the increased vitamin D exposure is mostly incidental. People with busier social lives tend to spend more time outside than those who do not. Etc.
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