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Dietary flavonoid intake in older adults: How many days of dietary assessment are required and what is the impact of seasonality?

Journal Article


Abstract


  • 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.

Publication Date


  • 2018

Citation


  • Kent, K., Charlton, K. E., Lee, S., Mond, J., Russell, J., Mitchell, P. & Flood, V. M. (2018). Dietary flavonoid intake in older adults: How many days of dietary assessment are required and what is the impact of seasonality?. Nutrition Journal, 17 (1), 1-9.

Scopus Eid


  • 2-s2.0-85040440888

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/5233

Number Of Pages


  • 8

Start Page


  • 1

End Page


  • 9

Volume


  • 17

Issue


  • 1

Place Of Publication


  • United Kingdom

Abstract


  • 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.

Publication Date


  • 2018

Citation


  • Kent, K., Charlton, K. E., Lee, S., Mond, J., Russell, J., Mitchell, P. & Flood, V. M. (2018). Dietary flavonoid intake in older adults: How many days of dietary assessment are required and what is the impact of seasonality?. Nutrition Journal, 17 (1), 1-9.

Scopus Eid


  • 2-s2.0-85040440888

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/5233

Number Of Pages


  • 8

Start Page


  • 1

End Page


  • 9

Volume


  • 17

Issue


  • 1

Place Of Publication


  • United Kingdom