Abstract
Objectives
The aim of this study was to examine the association between dephospho-uncarboxylated matrix Gla protein (dp-ucMGP), an indicator of vitamin K status, and cognitive decline, and the modifying role of 25(OH)D.
Design
Longitudinal study with six years follow-up.
Setting
Community based.
Participants
599 participants of the Longitudinal Aging Study Amsterdam (aged 55-65 years).
Measurements
Information processing speed and a composite Z-score by combining three domains of cognition reflecting general cognitive functioning.
Results
Generalized estimating equations (GEE) showed no significant associations between dp-ucMGP and decline in general cognitive functioning. Vitamin D modified the association between dp-ucMGP and speed of information processing (p<0.05). In the group with a 25(OH)D concentration > 50 nmol/l, the highest tertile of dp-ucMGP (>406 pmol/l), which corresponds to lower vitamin K levels, was associated with 1.5 higher score on information processing speed (p=0.023) as compared to the lowest tertile of dp-ucMGP.
Conclusion
In contrast to our hypothesis, a suboptimal vitamin K was not associated with cognitive decline in middle-aged adults.
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van den Heuvel, E.G.H.M., van Schoor, N.M., Vermeer, C. et al. Vitamin K status is not associated with cognitive decline in middle aged adults. J Nutr Health Aging 19, 908–912 (2015). https://doi.org/10.1007/s12603-015-0579-8
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DOI: https://doi.org/10.1007/s12603-015-0579-8