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Accuracy of a PDA-based dietary assessment program.

Jeannette Beasley¹, William T Riley, Jersino Jean-Mary

¹PICS, Inc., Reston, Virginia, USA. jbeasley@jhsph.edu

Nutrition (Burbank, Los Angeles County, Calif.)

|June 1, 2005

Summary

A personal digital assistant (PDA) food record, DietMatePro, accurately assesses energy and macronutrient intake, comparable to traditional 24-hour recalls. Portion size estimation remains the primary source of error in PDA dietary assessment.

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Area of Science:

Nutrition science
Dietary assessment technology

Background:

Accurate dietary assessment is crucial for nutritional research and public health.
Personal digital assistant (PDA) technology offers a potential platform for improving food record accuracy and efficiency.

Purpose of the Study:

To evaluate the accuracy of a PDA-based food record system (DietMatePro).
To identify and quantify sources of error in PDA-assisted dietary intake recording.

Main Methods:

Thirty-nine adults used DietMatePro for 3 days.
Comparison of PDA food records with 24-hour recalls and observed weighed meals.
Statistical analysis including paired t tests, Pearson's correlations, and Bland-Altman plots.

Main Results:

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No significant differences in daily calorie and macronutrient totals between DietMatePro and comparison methods.
Strong correlations (0.419-0.797) between DietMatePro and both 24-hour recall and observed meal data.
Portion size estimation errors accounted for 49% of the absolute caloric estimation error.

Conclusions:

DietMatePro provides a valid method for assessing energy and macronutrient intake, comparable to 24-hour recalls.
PDA-based dietary assessment tools can be effective, but portion size estimation requires attention.