I’ve been thinking a bit more about this. We know that people with lighter skin can produce more vitamin D from less sunlight. Likewise, we know that people with darker skin, have problems producing sufficient vitamin D from less sunlight. We also know that vitamin D deficiencies cause bones to lose density. So perhaps the racial – bone density correlation is a matter of sunlight and not race. Taking this in to account: I would assume that if the same study was run in the UK, the result would likely say that “white” people have greater bone density compared to “black” people.