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

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Quantifying accurate calorie estimation using the "think aloud" method.

Michael E Holmstrup¹, Kay Stearns-Bruening, Jeffrey Rozelle

¹Public and Allied Health Sciences Department, Delaware State University, Dover, DE 19901, USA. mholmstrup@desu.edu

Journal of Nutrition Education and Behavior

|November 13, 2012

Summary

Accurate calorie estimation relies on portion size conversion, energy density knowledge, and math skills. Improving these areas can enhance nutrition education and knowledge for clients with limited time.

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Area of Science:

Nutrition Science
Cognitive Psychology
Health Education

Background:

Nutrition education settings often have time constraints for clients.
Accurate calorie estimation is crucial for informed dietary choices.
Understanding estimation strategies can optimize nutrition education.

Purpose of the Study:

To identify cognitive strategies used for calorie estimation.
To compare estimation strategies between accurate and inaccurate estimators.
To inform targeted nutrition education interventions.

Main Methods:

A "Think Aloud" exercise was employed to observe calorie estimation processes.
Participants estimated calories in a standard dinner meal (415 kcal).
Subjects included 15 nutrition-trained and 15 untrained individuals.

Main Results:

Accurate estimators demonstrated proficiency in portion size to serving size conversion.
Knowledge of energy density was associated with accurate calorie estimation.
Effective implementation of basic math skills was observed in accurate estimators.

Conclusions:

The "Think Aloud" method effectively revealed cognitive processes in nutrition tasks.
Targeted instruction in portion conversion, energy density, and math can improve calorie estimation.
Enhanced calorie estimation accuracy can benefit nutrition education outcomes.