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Nutr Neurosci. 2018 Nov 19:1-9. doi: 10.1080/1028415X.2018.1536411. [Epub ahead of print]

Vitamin K status and inflammation are associated with cognition in older Irish adults.

Author information

1
a Department of Biological Sciences , University of Limerick , Limerick , Ireland.
2
b Department of Nutrition , University of Montreal , Montreal , Canada.
3
c School of Microbiology , University College Cork , Cork , Ireland.
4
d Alimentary Pharmabiotic Centre, Microbiome Institute, University College Cork , Cork , Ireland.
5
e Department of Mathematics and Statistics , University of Limerick , Limerick , Ireland.
6
f Health Research Institute, University of Limerick , Limerick , Ireland.

Abstract

Studies have shown associations between reduced vitamin K status and poor cognitive function. However, despite this apparent link, direct studies measuring cognitive function, vitamin K status and inflammation are lacking. In the current study, The ELDERMET cohort was investigated to identify associations between cognition, vitamin K status and inflammation. The primary aim of the ELDERMET study was to investigate the relationship between gut bacteria, diet, lifestyle and health in 500 older Irish adults. Significant differences in serum phylloquinone, dietary phylloquinone and inflammatory markers were found across varying levels of cognitive function, after controlling for sex, age, body mass index (BMI), triglycerides and blood pressure. In addition, significantly higher levels of dietary phylloquinone were found in those with better cognition compared to those with the poorest function. Higher levels of inflammatory were also associated with poor cognition. Furthermore, both dietary and serum phylloquinone were significant independent predictors of good cognitive function, after controlling for confounders. This study highlights the importance of dietary vitamin K as a potentially protective cognitive factor; it also provides evidence for the correlation between cognition and inflammation. Strategies should be devised by which elderly populations can access rich dietary sources of phylloquinone to maintain cognition.

KEYWORDS:

Cognitive function; Elderly; Inflammation; Vitamin K

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