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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Dietary flavonoid intake in older adults: How many days of dietary assessment are required and what is the impact of seasonality?
Nutrition Journal, Volume 17, No. 1, Article 7, Year 2018
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Description
Background: Within- and between-person variation in nutrient intake is well established, but little is known about variability in dietary flavonoid intake, including the effect of seasonality. Methods: Within- and between-individual variability of flavonoid intake, and intake of flavonoid subclasses was examined in older adults (n = 79; mean age 70.1 y (range: 60y-80y)), using three separate 4-day weighed food records (WFR) collected approximately 4 months apart. The effects of seasonality were also examined. Mixed-effects linear regression models were used to estimate within- and between-individual variance components for flavonoids and subclasses. The number of days of dietary assessment required for a high level of hypothetical accuracy was calculated from variance ratios. Results: Within- and between-individual variability was high for flavonoid intake, and intake of flavonoid subclasses, with variance ratios > 1. It was calculated that six days of WFR data are required for total flavonoid intake, and between 6 and 10 days was required for flavonoid subclasses. There was no effect of seasonality for total flavonoid intake or intake of flavonoid subclasses, with the exception that flavan-3-ol and flavanone intakes which were relatively low in summer, and in summer and winter, respectively. Conclusion: While the effects of seasonality on total flavonoid intake may be small, within- and between-individual variation associated with flavonoid intake assessment appears to be substantial across 12 days of WFR data in older adults. It is recommended that a minimum of 6 days of weighed food records are collected to minimise the impact of within- and between-individual variability on total flavonoid intake assessments in this population. © 2018 The Author(s).
Authors & Co-Authors
Charlton, Karen Elizabeth
Australia, Wollongong
Faculty of Science, Medicine and Health
Australia, Wollongong
Illawarra Health and Medical Research Institute
Russell, Joanna C.
Australia, Wollongong
University of Wollongong
Mitchell, Paul G.
Australia, Sydney
The University of Sydney
Statistics
Citations: 20
Authors: 3
Affiliations: 6
Identifiers
Doi:
10.1186/s12937-017-0309-7
ISSN:
14752891
Research Areas
Food Security
Study Design
Cross Sectional Study