Adaptation and validation of the Dietarian Identity Questionnaire (DIQ) into the Spanish context

  1. Cristina Chinea Montesdeoca
  2. Ernesto Suárez Rodríguez
  3. Bernardo Hernández Ruiz
  4. Isabel Duarte Lores
International Journal of Social Psychology, Revista de Psicología Social

ISSN: 0213-4748

Year of publication: 2021

Volume: 36

Issue: 3

Pages: 510-543

Type: Article

DOI: 10.1080/02134748.2021.1940703 DIALNET GOOGLE SCHOLAR


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.