Vitamin D and cognitive function and dementia risk in a biracial cohort: the ARIC Brain MRI Study

Background and purpose Some recent studies in older, largely white populations suggest that vitamin D, measured by 25‐hydroxyvitamin D [25( OH )D], is important for cognition, but such results may be affected by reverse causation. Measuring 25( OH )D in late middle age before poor cognition affects behavior may provide clearer results. Methods This was a prospective cohort analysis of 1652 participants (52% white, 48% black) in the A...