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Nutrients. 2017 Jan 10;9(1). pii: E53. doi: 10.3390/nu9010053.

B-Vitamin Intake and Biomarker Status in Relation to Cognitive Decline in Healthy Older Adults in a 4-Year Follow-Up Study.

Author information

1
Northern Ireland Centre for Food and Health, Ulster University, Cromore Road, Coleraine BT52 1SA, Northern Ireland, UK. h.mcnulty@ulster.ac.uk.
2
Northern Ireland Centre for Food and Health, Ulster University, Cromore Road, Coleraine BT52 1SA, Northern Ireland, UK. mw.ward@ulster.ac.uk.
3
Causeway Hospital, Northern Health and Social Care Trust, Coleraine BT52 1HS, Northern Ireland, UK. Fergal.Tracey@northerntrust.hscni.net.
4
Northern Ireland Centre for Food and Health, Ulster University, Cromore Road, Coleraine BT52 1SA, Northern Ireland, UK. l.hoey@ulster.ac.uk.
5
School of Medicine, Trinity College Dublin, Dublin 2, Ireland. AMOLLOY@tcd.ie.
6
Northern Ireland Centre for Food and Health, Ulster University, Cromore Road, Coleraine BT52 1SA, Northern Ireland, UK. k.pentieva@ulster.ac.uk.

Abstract

Advancing age can be associated with an increase in cognitive dysfunction, a spectrum of disability that ranges in severity from mild cognitive impairment to dementia. Folate and the other B-vitamins involved in one-carbon metabolism are associated with cognition in ageing but the evidence is not entirely clear. The hypothesis addressed in this study was that lower dietary intake or biomarker status of folate and/or the metabolically related B-vitamins would be associated with a greater than expected rate of cognitive decline over a 4-year follow-up period in healthy older adults. Participants (aged 60-88 years; n = 155) who had been previously screened for cognitive function were reassessed four years after initial investigation using the Mini-Mental State Examination (MMSE). At the 4-year follow-up assessment when participants were aged 73.4 ± 7.1 years, mean cognitive MMSE scores had declined from 29.1 ± 1.3 at baseline to 27.5 ± 2.4 (p < 0.001), but some 27% of participants showed a greater than expected rate of cognitive decline (i.e., decrease in MMSE > 0.56 points per year). Lower vitamin B6 status, as measured using pyridoxal-5-phosphate (PLP; <43 nmol/L) was associated with a 3.5 times higher risk of accelerated cognitive decline, after adjustment for age and baseline MMSE score (OR, 3.48; 95% CI, 1.58 to 7.63; p < 0.05). Correspondingly, lower dietary intake (0.9-1.4 mg/day) of vitamin B6 was also associated with a greater rate of cognitive decline (OR, 4.22; 95% CI, 1.28-13.90; p < 0.05). No significant relationships of dietary intake or biomarker status with cognitive decline were observed for the other B-vitamins. In conclusion, lower dietary and biomarker status of vitamin B6 at baseline predicted a greater than expected rate of cognitive decline over a 4-year period in healthy older adults. Vitamin B6 may be an important protective factor in helping maintain cognitive health in ageing.

KEYWORDS:

B-vitamin biomarkers; ageing; cognition; dietary intakes; one-carbon metabolism; pyridoxal-5-phosphate (PLP); vitamin B6

PMID:
28075382
PMCID:
PMC5295097
DOI:
10.3390/nu9010053
[Indexed for MEDLINE]
Free PMC Article

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