If by "theory" you mean "darker skin in higher altitudes -> low vitamin D", I don't have anything against that. If by "theory" you mean "low vitamin D -> autis

If by "theory" you mean "darker skin in higher altitudes -> low vitamin D", I don't have anything against that. If by "theory" you mean "low vitamin D -> autism", you're reading science wrong (by only using correlation when reasoning about it). You have to control for other factors in Somali population. That's how you do proper research. In its current form, as the researchers themselves point out, this says that a future study is needed. Let me repeat: you might be entirely right but "this correlation supports the theory better" is not scientific evidence. It's just a hint to direct research. As I said, if they find Swedish mothers with really low vitamin D and compare with Swedish mothers with high vitamin D, that would say a lot more.