Could this partly be because if you have COVID-19 you have to self isolate indoors and if you are doing that, you aren’t going to get enough sunlight to produce enough vitamin D?
Yeah, good question whether it’s a reversed causal relationship.
yeah this is something that came to mind when I read the title
Same article as this one maybe ? For EU citizens. https://www.healthline.com/health-news/new-study-found-80-percent-of-covid-19-patients-were-vitamin-d-deficient
seems like it yeah
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