Adaptation and validation of the Dietarian Identity Questionnaire (DIQ) into the Spanish context ( Adaptación y validación al contexto español del Cuestionario de Identidad Alimentaria — DIQ )

The aim of this study is to adapt and validate the Dietarian Identity Questionnaire (DIQ) into the Spanish context. In an initial study, a confirmatory factor analysis was performed, obtaining good validity and goodness-of-fit indices ( CMIN/DF = 2.026; CFI = .976; NNFI = .972; SRMR = .054 and RMSEA = .057). In a second study, evidence of validity based on the relationship with other variables was analysed using the ‘Meaning of Food in Life’ questionnaire. Correlations were made and differences between people with a vegan ( N = 43), vegetarian ( N = 44) and omnivorous ( N = 115) diet were analysed. The results indicate that vegans and vegetarians differ from omnivores in all identity factors ( p = ≤ .001). In addition, differences were found between vegans and vegetarians in the Public Regard ( p = .035), Outgroup Regard ( p = .036) and Moral Motivation ( p = .036) factors. DIQ is a good instrument that can be used in studies on food choices and sustainability.