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Examining the validity of Diet ID™ for measuring Healthy Eating Index
Journal article   Peer reviewed

Examining the validity of Diet ID™ for measuring Healthy Eating Index

Dahlia Stott, Michael Bruneau, Jr, Jonathan M Deutsch, Jennifer A Nasser, Mara Z Vitolins and Brandy-Joe Milliron
Nutrition and health (Berkhamsted), Forthcoming
02 Jun 2026
DOI: https://doi.org/10.1177/02601060261454260
PMID: 42227870

Abstract

dietary assessment diet quality photo navigation Diet ID Diet History Questionnaire diet quality
BackgroundDiet ID™ is a digital, image-based dietary assessment tool that uses pattern recognition and comparisons of meal images to estimate overall dietary intake and diet quality.ObjectiveTo examine the relative validity of Diet ID™ in measuring Healthy Eating Index-2020 (HEI-2020) total and component scores.MethodsIn this cross-sectional study, participants completed Diet ID™ and the Diet History Questionnaire II, a semiquantitative food frequency questionnaire. Spearman's rho correlations examined relative validity. Wilcoxon signed-rank tests, cross-classification, and Bland-Altman plots assessed agreement.ResultsThe HEI-2020 total scores were moderately correlated (  = 0.46,  < 0.001) and most components were weakly correlated (  = 0.12-0.34,  < 0.05). There was poor agreement between the dietary assessment methods, as evidenced by significant differences in most scores (  < 0.001), fewer than half of the participants being classified into the same tertile, and Bland-Altman plots.ConclusionFurther work is needed to improve Diet ID™ to measure HEI-2020 total and component scores.

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