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Plasma phylloquinone (vitamin K1) concentration and its relationship to intake in a national sample of British elderly people

Published online by Cambridge University Press:  09 March 2007

C. W. Thane ,
C. J. Bates ,
M. J. Shearer ,
N. Unadkat ,
D. J. Harrington ,
A. A. Paul ,
A. Prentice  and
C. Bolton-Smith
C. W. Thane*
Affiliation:
MRC Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK
C. J. Bates
Affiliation:
MRC Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK
M. J. Shearer
Affiliation:
Vitamin K Research & Diagnostic Units, Haemophilia Centre, St Thomas' Hospital, London SE1 7EH, UK
N. Unadkat
Affiliation:
Vitamin K Research & Diagnostic Units, Haemophilia Centre, St Thomas' Hospital, London SE1 7EH, UK
D. J. Harrington
Affiliation:
Vitamin K Research & Diagnostic Units, Haemophilia Centre, St Thomas' Hospital, London SE1 7EH, UK
A. A. Paul
Affiliation:
MRC Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK
A. Prentice
Affiliation:
MRC Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK
C. Bolton-Smith
Affiliation:
MRC Human Nutrition Research, Elsie Widdowson Laboratory, Fulbourn Road, Cambridge CB1 9NL, UK
*
*Corresponding author:Mr C. W. Thane, fax +44 1223 437515, email [email protected]
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Abstract

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Plasma phylloquinone (vitamin K1) concentration was examined according to season, socio-demographic and lifestyle factors and phylloquinone intake in a nationally representative sample of British people aged 65 years and over from the 1994–5 National Diet and Nutrition Survey. Values for both plasma phylloquinone concentration and phylloquinone intake were available from 1076 participants (561 men, 515 women). Eight hundred and thirty-four were living in private households, 242 in residential or nursing homes. Weighted geometric mean plasma phylloquinone concentrations were 0·36 (95 % CI 0·06, 2·01) and 0·24 (95 % CI 0·06, 0·96) nmol/l in free-living and institution samples respectively. Plasma phylloquinone concentrations did not generally differ between men and women, although values in free-living people were significantly lower during autumn and winter (October to March). Plasma phylloquinone concentration was not significantly associated with age. Plasma phylloquinone concentrations were positively correlated with phylloquinone intake in free-living men and women (r 0·18 and 0·30 respectively, both P<0·001). Stepwise multiple regression analysis found that 11 % of the variation in plasma phylloquinone concentration was explained by phylloquinone intake, season and plasma triacylglycerol concentration. After adjustment for age and corresponding nutrient intakes, plasma phylloquinone concentration was significantly associated (each P<0·01) with plasma concentrations of triacylglycerol, cholesterol, retinol and 25-hydroxyvitamin D in free-living women but not men, and with plasma concentrations of carotenes, α- and γ-tocopherols and lutein in free-living men and women. The possibility of concurrent low fat-soluble vitamin status in elderly populations may be a cause for concern.

Keywords

Vitamin K statusDietary intakeFat-soluble vitamins
Type
Research Article
Information
British Journal of Nutrition , Volume 87 , Issue 6 , June 2002 , pp. 615 - 622
Copyright
Copyright © The Nutrition Society 2002

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