Wrt. the original post there is also another correlation - vitamin D insufficiency is more prevalent in African American and Latin populations and those populations are more seriously affected by Covid.
Also i think genetic predisposition to vitamin D that the original post uses doesn't matter much (until it hits pathological edges of course) because daily exposure to Sun would be more important factor than genetic predisposition.
Yes and no. If you live in a northern hemisphere country, it is possible to spend hours in the sunlight with pale skin during the colder months and not receive enough vitamin D if you don't have supplemental sources.
