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Related Experiment Video

Updated: Jul 10, 2026

Iterative Development of an Innovative Smartphone-Based Dietary Assessment Tool: Traqq

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Published on: March 19, 2021

Fitting portion sizes in a self-administered food frequency questionnaire.

Ute Nöthlings¹, Kurt Hoffmann, Manuela M Bergmann

¹German Institute of Human Nutrition Potsdam-Rehbruecke, 14558 Nuthetal, Germany. ute.noethlings@dife.de

The Journal of Nutrition

|November 22, 2007

Summary

A new method for estimating food portion sizes in food frequency questionnaires (FFQs) improved quantitative intake assessment but not participant ranking. This dietary assessment tool is valuable for epidemiological studies.

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Published on: September 18, 2018

Area of Science:

Nutrition science
Epidemiology
Dietary assessment

Background:

Semiquantitative food frequency questionnaires (FFQs) are used in epidemiological studies.
Accurate portion size estimation is crucial for dietary assessment.
Graphical displays of portion sizes can aid FFQ completion.

Purpose of the Study:

To develop and validate a simple semiquantitative FFQ for epidemiological studies.
To compare the impact of fitted versus predefined portion sizes on dietary intake assessment.
To evaluate the utility of fitted portion sizes in improving the accuracy of food and nutrient intake data.

Main Methods:

A validation study was conducted with 393 participants from the EPIC-Potsdam Study.
Participants completed two 24-hour dietary recalls (24HDR) and the FFQ over one year.
Fitted portion sizes were calculated using 24HDR data and FFQ intake frequency; predefined sizes were based on prior study data.

Main Results:

Fitted portion sizes resulted in mean food group intakes closer to 24HDRs (102% for men/women) compared to predefined sizes (79% men, 95% women).
Deattenuated correlation coefficients for nutrients and food groups were similar between fitted and predefined portion sizes.
Fitted portion sizes improved quantitative intake assessment but did not enhance participant ranking.

Conclusions:

Fitting portion sizes using recent reference data improves the quantitative accuracy of food and nutrient intake in FFQs.
This method enhances dietary assessment for epidemiological research compared to using predefined portion sizes.
The improved quantitative assessment does not necessarily lead to better ranking of individuals' dietary habits.