Midlife Vitamin D Linked to Lower Tau - Summary - MDSpire

Midlife Vitamin D Linked to Lower Tau

Higher vitamin D levels in early midlife were tied to lower tau burden on later brain imaging, while no association was seen with amyloid.

  • By

  • Andrea Surnit

  • April 10, 2026

  • 3 min

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Objective:

To investigate the association between circulating vitamin D levels in early midlife and tau deposition on brain imaging in dementia-free adults.

Key Findings:
  • Higher vitamin D levels were associated with lower global tau burden and lower tau burden in regions vulnerable to Alzheimer's disease.
  • No association was found between vitamin D levels and amyloid burden.
  • Findings remained consistent after excluding participants taking vitamin D supplements.
Interpretation:

The study suggests that higher serum vitamin D levels in early midlife may be linked to lower tau deposition, indicating a potential modifiable factor for preclinical Alzheimer's disease.

Limitations:
  • Predominantly White cohort limits generalizability.
  • Lack of repeated vitamin D measurements over time.
  • Long interval between blood sampling and brain imaging may lead to exposure misclassification.
Conclusion:

In dementia-free asymptomatic adults, higher serum 25-hydroxyvitamin D in early midlife was associated with lower tau deposition on brain imaging a mean of 16 years later.

Original Source(s)

Midlife Vitamin D Linked to Lower Tau

  • by Andrea Surnit

  • April 10, 2026

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