Journal
PUBLIC HEALTH NUTRITION
Volume 12, Issue 8, Pages 1290-1297Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1368980008003923
Keywords
Monetary diet cost; 24 h urine; Epidemiology
Funding
- Ministry of Health, Labour, and Welfare, Japan.
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Objective: All previous studies on monetary diet cost have examined the relationship of monetary cost of self-reported diet to self-reported, rather than biomarker-based, estimates of dietary intake. The present cross-sectional study examined the association between monetary costs of self-reported diet and biomarker-based estimates of nutrient intake. Design: Monetary diet cost (Japanese yen/1000kJ) was calculated based on dietary intake information from a self-administered, comprehensive diet history questionnaire using retail food prices. Biomarker-based estimates of nutrient intake (percentage of energy for protein and mg/1000 kJ for K and Na) were estimated based on 24 h urinary excretion and estimated energy expenditure. Setting: A total of fifteen universities and colleges in Japan. Subjects: A total of 1046 female Japanese dietetic students aged 18-22 years. Results: Total monetary diet cost showed a significant positive association with biomarker-based estimates of protein, K and Na. Vegetables and fish were not only the main contributors to total monetary diet cost (16.4% and 15.5%, respectively) but also were relatively strongly correlated with total monetary diet cost (Pearson's correlation coefficient: 0.70 and 0.68, respectively). Monetary cost of vegetables was significantly positively associated with all three nutrients, while that of fish showed a significant and positive association only with protein. Conclusions: Total monetary cost of self-reported diet was positively associated with biomarker-based estimates of protein, K and Na intake in Young Japanese women, and appeared mainly to be explained by the monetary costs of vegetables and fish.
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