da Silva AD, Oliveira JS, de Castro IC, Paiva WC, Gomes JMG, Pimenta LCJP. Association of vitamin D and cognition in people with type 2 diabetes: a systematic review.
Nutr Rev 2024;
82:622-638. [PMID:
37403328 DOI:
10.1093/nutrit/nuad085]
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Abstract
CONTEXT
There is a high prevalence of vitamin D deficiency and impaired cognitive function in people with type 2 diabetes mellitus (T2DM).
OBJECTIVE
To critically and systematically review the literature on the association between vitamin D status and cognitive performance in people with type 2 diabetes.
DATA SOURCES
This review was conducted according to PRISMA recommendations. MEDLINE, SCOPUS, the Cochrane Library, and Web of Science databases were searched using the terms "Diabetes Mellitus, Type 2", "Cognitive Function", and "Vitamin D".
DATA EXTRACTION
Eight observational and 1 randomized study were included, containing data of 14 648 adult and elderly individuals (19-74 y). All extracted data were compiled, compared, and critically analyzed.
DATA ANALYSIS
There is no strong evidence that lower serum concentrations of vitamin D and vitamin D-binding protein are associated with worsening cognitive function in individuals with T2DM. Vitamin D supplementation (12 wk) improved the scores of some executive functioning tests, although there was no difference between low doses (5000 IU/wk) and high doses (50 000 IU/wk).
CONCLUSIONS
There is no high-quality evidence demonstrating an association between vitamin D status and cognitive function, or clinical benefits on cognition from vitamin D supplementation in individuals with T2DM. Future studies are needed. Systematic Review Registration: PROSPERO registration no. CRD42021261520.
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