>This isn't even about social categories “Black” and “White”, it is literally about the direct correlates of skin colour.
To expand upon this according to an ONS study "Blacks" in England and whales had a 1.9 times higher rate of dying compared to "Whites" after socioeconomic controls, while Pakistani and Bangladeshi ethnic groups were 1.6 times more likely.[1] This makes sense if you figure lighter skin was a evolved trait for those in latitudes that got less sun. [2]
I spent about 3 seconds wondering why in the world you were talking about whale vitamin-D levels, and thinking it was vaguely offensive that you were comparing ethnic/racial groups of humans to marine mammals.
[1] https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...
[2]https://www.pnas.org/content/107/Supplement_2/8962