Self-reported dietary supplement use is confirmed by biological markers in the Norwegian mother and child cohort sudy (MoBa)

Background/Aims: A food frequency questionnaire (FFQ) and a database for dietary supplements were developed for use in the Norwegian Mother and Child Cohort Study (MoBa). The aim of the present study was to investigate the relation between reported use and biomarkers in supplement and nonsupplement...

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Bibliographic Details
Published in:Annals of nutrition and metabolism 2007, Vol.51 (2), p.146-154
Main Authors: Brantsæter, A.L, Haugen, M, Hagve, T.A, Aksnes, L, Rasmussen, S.E, Julshamn, K, Alexander, J, Margrete-Meltzer, H
Format: Article
Language:English
Subjects:
accuracy
biomarkers
blood chemistry
carotenoids
children
cohort studies
data collection
data validation
dietary supplements
flavonoids
folic acid
food frequency questionnaires
iodine
maternal nutrition
mothers
Norwegian Mother and Child Cohort Study
nutritional status
omega-3 fatty acids
omega-6 fatty acids
pregnancy
self-reported data
vitamin D
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Summary:Background/Aims: A food frequency questionnaire (FFQ) and a database for dietary supplements were developed for use in the Norwegian Mother and Child Cohort Study (MoBa). The aim of the present study was to investigate the relation between reported use and biomarkers in supplement and nonsupplement users and to validate self-reported intake of dietary supplements in mid pregnancy. Method: 120 women were recruited from MoBa, and 119 subjects completed the MoBa FFQ and a 4-day weighed food diary. Information on supplement use was collected by both methods. Venous blood specimens and 24-hour urine samples were obtained for measurement of dietary biomarkers. Results: Biomarker concentration/excretion and intake differed significantly between supplement and nonsupplement users for vitamin D, carotenoids, folate, the n-6/n-3 fatty acid ratio and iodine (p < 0.05 for all variables). Flavonoid excretion was higher in flavonoid-supplement users (p < 0.05). Significant correlations between total dietary intake (food and supplements) and biomarker concentration/excretion were found for vitamin D (r = 0.45, p < 0.001), folate (r = 0.26, p = 0.005), the n-6/n-3 fatty acid ratio (r = 0.36, p < 0.001) and iodine (r = 0.42, p < 0.001). Conclusion: The biochemical indicators examined in this study confirmed differences in self-reported micronutrient intake between supplement and nonsupplement users for vitamin D, beta-carotene, folate, n-3 fatty acids, flavonoids and iodine.
ISSN:0250-6807
1421-9697