Study Finds Association Between Midlife Vitamin D Levels and Reduced Tau Protein Decades Later Introduction A long-term study published in April 2026 has found that higher vitamin D levels in midlife are associated with lower levels of tau protein in the brain approximately 16 years later. Tau protein accumulation is considered a key biomarker for Alzheimer’s disease. The research, published in Neurology Open Access, followed 793 adults over 16 years but does not prove a direct causal link between vitamin D deficiency and dementia risk. Instead, the findings suggest a potential modifiable factor in long-term brain health, according to the study…

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