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    Assessing self-reported green tea and coffee consumption by food frequency questionnaire and food record and their association with polyphenol biomarkers in Japanese women

    Access Status
    Fulltext not available
    Authors
    Takechi, Ryu
    Alfonso, Helman
    Harrison, A.
    Hiramatsu, N.
    Ishisaka, A.
    Tanaka, A.
    Tan, L.
    Lee, A.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Takechi, R. and Alfonso, H. and Harrison, A. and Hiramatsu, N. and Ishisaka, A. and Tanaka, A. and Tan, L. et al. 2018. Assessing self-reported green tea and coffee consumption by food frequency questionnaire and food record and their association with polyphenol biomarkers in Japanese women. Asia Pacific Journal of Clinical Nutrition. 27 (2): pp. 460-465.
    Source Title
    Asia Pacific Journal of Clinical Nutrition
    DOI
    10.6133/apjcn.052017.06
    ISSN
    0964-7058
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/65797
    Collection
    • Curtin Research Publications
    Abstract

    Background and Objectives: Despite the demonstrated protective effects of green tea and coffee intake against several chronic diseases, finding between studies have not been consistent. One potential reason of this discrepancy is the imprecision in the measurement of tea or coffee consumption using food frequency questionnaire (FFQ) and food record (FR) in epidemiological studies. Methods and Study Design: In a sample of 57 healthy Japanese women, intake of green tea and coffee was estimated by a validated FFQ and a 3-day FR, while their plasma and urine concentrations of polyphenol biomarkers were measured by HPLC. The polyphenols assessed included (-)-epigallocatechin gallate (EGCG), (-)-epicatechin gallate (ECG), (-)-epigallocatechin (EGC) and (-)- epicatechin (EC), caffeic acid (CA) and chlorogenic acid (CGA). Results: Green tea consumption estimated by FFQ and FR showed moderate association, while strong association was detected for coffee consumption. Urinary green tea polyphenol concentrations were moderately-strongly associated with FR-estimated intake, while the associations were weak with FFQ. Similarly, coffee polyphenols in urine were moderately associated with FR-estimated coffee intake, whereas FFQ showed poor correlation. The associations between urinary and plasma polyphenols ranged from moderate to high. Conclusions: The results indicated that firstly, the FFQ tends to overestimate green tea intake. Secondly, the urinary polyphenols are preferred over plasma polyphenols as a potential surrogate marker of the short-term green tea and coffee intake, while their use as an indicator of long-term consumption is not reliable.

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