Black Americans are dying of Covid-19 at a higher rate than whites. Socioeconomic factors such as gaps in access to health care no doubt play a role. But another possible factor has been largely overlooked: vitamin D deficiency that weakens the immune system.
Researchers last week released the first data supporting this link. They found that the nations with the highest mortality rates—Italy, Spain and France—also had the lowest average vitamin D levels among countries affected by the pandemic.
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