[mixmastamyk]

Yes, age and skin color also have a large influence on whether your body can utilize the sunlight you receive.

[trhway]

Yep, there were studies that Somali refugee populations in MN and Sweden have very low vitamin D levels (and associated high rate of children autism)

[selimthegrim]

How does the autism follow?

[trhway]

while we don't know "how", there is growing body of work showing a correlation between low level vitamin D - in particular winter pregnancies in Northern Europe countries correlate with higher rate of autism as well as the mentioned studies of the 2 clusters of Somali refugees.