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Related Experiment Videos

Developing a digital photography-based method for dietary analysis in self-serve dining settings.

Mary J Christoph1, Brett R Loman2, Brenna Ellison3

  • 1Division of General Pediatrics and Adolescent Health, Department of Pediatrics, University of Minnesota, 2450 Riverside Avenue, Minneapolis, MN 55454, United States.

Appetite
|April 6, 2017
PubMed
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Digital photography offers an objective way to assess student food intake in dining halls. This method shows high agreement for food selection and servings, aiding dietary intake studies.

Area of Science:

  • Nutrition Science
  • Public Health Research
  • Dietary Assessment Methods

Background:

  • Traditional dietary assessment methods (food frequency questionnaires, diaries, 24-hour recalls) lack objectivity.
  • Digital photography is a promising, yet under-assessed, tool for objective dietary intake measurement, especially in self-serve environments.

Purpose of the Study:

  • To evaluate the feasibility and reliability of digital photography for assessing food selection, servings, and consumption among university students in a self-serve dining hall.
  • To determine the inter- and intra-rater reliability of coding meal photos for dietary intake analysis.

Main Methods:

  • Research assistants captured pre- and post-meal digital photographs of student plates in a university dining hall.
  • Four coders assessed meal photos for the presence, servings, and consumption of MyPlate food groups.
Keywords:
College studentsDietary analysisDigital photographyNutritionSelf-serve dining

Related Experiment Videos

  • Inter- and intra-rater reliability analyses were conducted on approximately 180 and 50 meals, respectively.

    • Main Results:

    • High inter-rater agreement (93.5%) and intra-rater agreement (95.6%) were achieved in coding meal photos.
    • Coders demonstrated excellent agreement in identifying food group presence (95-99%) and estimating servings (81-98%).
    • Estimating consumption of mixed dishes presented more challenges, with agreement ranging from 77-94%.

    Conclusions:

    • Digital photography is a feasible and reliable method for objective dietary intake assessment in real-world, self-serve settings.
    • The method provides high agreement for food selection and servings, supporting its use in large-scale dietary studies.
    • Researchers must consider potential confounding factors, like multiple servings, when analyzing dietary intake in all-you-can-eat environments.