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The Effects of Vitamin D Insufficiency and Seasonal Decrease on Cognition

Published online by Cambridge University Press:  20 October 2014

Jacqueline A. Pettersen ,
Sara Fontes  and
Carlie L. Duke
Jacqueline A. Pettersen*
Affiliation:
Northern Medical Program, University of Northern British Columbia, Prince George Canada Division of Neurology, Department of Internal Medicine, University of British Columbia, Vancouver, British Columbia, Canada
Sara Fontes
Affiliation:
Northern Medical Program, University of Northern British Columbia, Prince George Canada
Carlie L. Duke
Affiliation:
Northern Medical Program, University of Northern British Columbia, Prince George Canada
*
Northern Medical Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, V2N 4Z9, Canada. Email: pettersj@unbc.ca.
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Abstract

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Background:

Vitamin D3 (cholecalciferol) deficiency has been associated with dementia and cognitive decline. Which cognitive domains are most associated with D3 levels and how seasonal fluctuations in levels relate to cognition is unclear. We addressed these questions using a prospective observational study examining associations between D3 levels and cognition among individuals living in northern latitudes (54°N) in summer and winter.

Methods:

Healthy adult participants underwent testing in summer and winter of D3 levels and cognition, using the Symbol digit Modalities test, phonemic fluency, digit Span and CANTAB® battery.

Results:

Of 32 participants tested in the summer, 46% were D3 insufficient (<75 nmol/L) and performed worse on digit Span Backward (DS-B) (μ=5.8, SD=2) than those who were sufficient (μ=7.9, SD=2), p=0.018. In multivariate analyses, sufficiency status was an independent predictor of dS-B, (b=0.41, p=0.02). The majority (63%) of 19 participants tested in winter were D3 insufficient, with levels declining by a median of 15 nmol/L overall. Those with insufficient levels performed worse (i.e., higher scores) on the CANTAB® Spatial Working Memory (SWM) task (μ=36.1, SD=6 versus μ=29.3, SD=8), p=0.05). Those with larger drops in levels (≥15 nmol/L) showed decline/less improvement on the CANTAB® one touch Stockings of Cambridge (OTS) task, (μ=0.50, SD=1.9 versus μ=-2.11, SD=2.6, p=0.01), a test of working memory/executive functioning.

Conclusions:

Vitamin D3 insufficiency and seasonal declines ≥15 nmol/L were associated with inferior working memory/executive functioning. While our findings require confirmation, they suggest that sufficient D3 levels should be maintained year-round, likely necessitating supplementation, at least during winter at higher latitudes.

Type
Original Article
Information
Canadian Journal of Neurological Sciences , Volume 41 , Issue 4 , July 2014 , pp. 459 - 465
Copyright
Copyright © The Canadian Journal of Neurological 2014

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