Midlife Vitamin D Linked to Lower Alzheimer's Tau Deposits Later

A midlife Framingham Heart Study analysis found that higher vitamin D levels at about age 39 were associated with lower brain tau protein deposits 16 years later, a potential protective marker against Alzheimer's disease; there was no observed link with amyloid beta. The study is observational, so causation can’t be established, and clinical trials are needed to test whether vitamin D supplementation could help prevent dementia.