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Global Obesity Prevention Center

Journal Club Announcement

Primary Reference Article

Pooled results from 5 validation studies of self-reported instruments using recovery biomarkers for energy and protein intake.
Am J Epidemiol. 2014 Jul 15;180(2):172-88. doi: 10.1093/aje/kwu116. Epub 2014 Jun 10.

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casey r jcWhen: Thursday, March 26th @ 12:00 p.m. EDT - 1:00 p.m. EDT
Where: JHSPH, 615 N. Wolfe Street, Baltimore, MD 21205, Room E2523
Discussion Leader: Casey Rebholz, PhD, a 2nd year postdoctoral fellow in the Department of Epidemiology and the Welch Center for Prevention, Epidemiology, and Clinical Research.
Topic: Pooled results from 5 validation studies of self-reported instruments using recovery biomarkers for energy and protein intake.



We pooled data from 5 large validation studies of dietary self-report instruments that used recovery  biomarkers as references to clarify the measurement properties of food frequency questionnaires (FFQs) and 24-hour recalls. The studies were conducted in widely differing US adult populations from 1999 to 2009. We report on total energy, protein, and protein density intakes. Results were similar across sexes, but there was heterogeneity across studies. Using a FFQ, the average correlation coefficients for reported versus true intakes for energy, protein, and protein density were 0.21, 0.29, and 0.41, respectively.

Using a single 24-hour recall, the coefficients were 0.26, 0.40, and 0.36, respectively, for the same nutrients and rose to 0.31, 0.49, and 0.46 when three 24-hour recalls were averaged. The average rate of under-reporting of energy intake was 28% with a FFQ and 15% with a single 24-hour recall, but the percentages were lower for protein. Personal characteristics related to under-reporting were body mass index, educational level, and age. Calibration equations for true intake that included personal characteristics provided improved prediction. This project establishes that FFQs have stronger correlations with truth for protein density than for absolute protein intake, that the use of multiple 24-hour recalls substantially increases the correlations when compared with a single 24-hour recall, and that body mass index strongly predicts under-reporting of energy and protein intakes.

Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health 2014. This work is written by (a) US Government employee(s) and is in the public domain in the US.

Keywords: 24-hour recall; attenuation factors; calibration equations; dietary measurement error; food frequency questionnaire; under-reporting

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