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Serum 25-hydroxyvitamin D concentration and cognitive impairment
David J Llewellyn1, Kenneth M Langa, Iain A Lang
1Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK. dl355@medschl.cam.ac.uk
Journal of Geriatric Psychiatry and Neurology
|December 17, 2008
Summary
Low serum 25-hydroxyvitamin D levels are linked to a higher likelihood of cognitive impairment in older adults. This study highlights the potential role of vitamin D in maintaining cognitive health.
Area of Science:
- Gerontology
- Nutritional Neuroscience
- Epidemiology
Background:
- Vitamin D's role in cognitive function is under investigation, with existing research yielding inconclusive results.
- Cognitive impairment is a significant concern for aging populations worldwide.
Purpose of the Study:
- To investigate the association between serum 25-hydroxyvitamin D levels and cognitive impairment in older adults.
- To determine if lower vitamin D status correlates with increased odds of cognitive decline.
Main Methods:
- Cross-sectional study involving 1766 adults aged 65+ from the Health Survey for England 2000.
- Cognitive function assessed using the Abbreviated Mental Test Score.
- Logistic regression used to model the relationship between serum 25-hydroxyvitamin D quartiles and cognitive impairment, adjusting for covariates.
Main Results:
- 12% of participants exhibited cognitive impairment.
- Individuals in the lowest quartile of serum 25-hydroxyvitamin D (8-30 nmol/L) had significantly higher odds of cognitive impairment (OR 2.3, 95% CI 1.4-3.8) compared to the highest quartile.
- A significant linear trend (P=.001) indicated that lower vitamin D levels were associated with increased odds of cognitive impairment.
Conclusions:
- Low serum 25-hydroxyvitamin D is associated with increased odds of cognitive impairment in older adults.
- These findings suggest a potential link between vitamin D status and cognitive health in the elderly population.
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