This is a good study. Although the link between Vitamin D and anemia is not fully established, this study provides insight into that link. Black children are more anemic compared to white children, as stated in this study.If indeed Vitamin D and anemia is related, one theory of mine is this: black children have more melanin in their skin that's why when they go out in the sun, the sun's ray can't fully penetrate their skin and so can't fully activate vitamin D.