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Vitamin C intake and plasma ascorbic acid concentration in adolescents

Published online by Cambridge University Press:  09 March 2007

P. M. Finglas ,
Angela Bailey ,
A. Walker ,
Julie M. Loughridge ,
A. J. A. Wright  and
Susan Southon
P. M. Finglas
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich, NR4 7UA
Angela Bailey
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich, NR4 7UA
A. Walker
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich, NR4 7UA
Julie M. Loughridge
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich, NR4 7UA
A. J. A. Wright
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich, NR4 7UA
Susan Southon
Affiliation:
AFRC Institute of Food Research, Norwich Laboratory, Norwich Research Park, Colney, Norwich, NR4 7UA
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Abstract

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The relationship between vitamin C intake and status was investigated in a group of adolescents (13–14 years old). Dietary intakes were assessed using a 7 d weighed dietary record method, coupled with the collection of duplicate diets. Vitamin C intakes calculated using food composition tables were compared with values obtained by direct analysis of duplicate diets. Vitamin C status was judged via measurement of plasma ascorbic acid (AA) concentration in blood samples taken after a 12–15 h fast. The relationship between calculated and analysed vitamin C intake and plasma AA concentration was examined. Average daily calculated vitamin C intakes, for the group (n 54) as a whole over a 7 d period, gave a good estimate of intake, as judged by prompt analysis of duplicate diets. However, analysed v. calculated intakes were significantly different for approximately one-third of subjects when data were examined on an individual basis. Large discrepancies between analysed and calculated values could not be accounted for on a food group basis. In all but two individuals, calculated vitamin C intake was in excess of the new reference nutrient intake (RNI, part of the new daily reference values (Department of Health and Social Security, 1991)) of 40 mg and all plasma AA concentrations were well above those used to indicate even a moderate risk of deficiency. A relationship between vitamin C intake and plasma AA was observed for both males (n 19) and females (n 35). However, the relationship was much stronger for males who showed a wider range of both intake and plasma AA values.

Keywords

Vitamin CPlasma ascorbic acidAdolescents
Type
Vitamin C Intake and Status in Abolescents
Information
British Journal of Nutrition , Volume 69 , Issue 2 , March 1993 , pp. 563 - 576
Copyright
Copyright © The Nutrition Society 1993

References

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