Resumen: Objective: To analyse the effect of general and specific self-efficacy on the adherence to a gluten free diet (GFD) in patients with celiac disease along with the effect of other relevant variables. Design: 271 patients with celiac disease participated in this transversal descriptive study and completed a series of questionnaires regarding adherence (CDAT), general self-efficacy (GSES) and specific self-efficacy (Celiac-SE) and quality of life (CD-Qol), among others. Main Outcome Measures: Dependent variable was adherence to the Gluten Free Diet (GFD). Main independent variables were general self-efficacy, specific self-efficacy and quality of life. Model tests were conducted using regression analysis. Results: 71.9% of patients show an excellent or good adherence to the diet. Higher levels of adherence are positively associated to a high expectancy of specific self-efficacy, to the perceived adoption of recommended behaviours, risk perception and better quality of life (these variables accounted for 36.4% of the variance in the adherence to a GFD, p <.001). Conclusions: Specific self-efficacy rather than general has a predictive value in adherence to a GFD. Therefore, we need to develop and transculturally adapt new instruments to assess specific self-efficacy. Celiac-SE has proved to be a useful scale for this objective. Idioma: Inglés DOI: 10.1080/08870446.2019.1675658 Año: 2020 Publicado en: Psychology and Health 35, 6 (2020), 734-749 ISSN: 0887-0446 Factor impacto JCR: 3.073 (2020) Categ. JCR: PSYCHOLOGY, MULTIDISCIPLINARY rank: 39 / 139 = 0.281 (2020) - Q2 - T1 Categ. JCR: PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH rank: 52 / 176 = 0.295 (2020) - Q2 - T1 Factor impacto SCIMAGO: 1.209 - Public Health, Environmental and Occupational Health (Q1) - Applied Psychology (Q1)