Development, reproducibility, and validity of a semiquantitative food frequency questionnaire for use among the adult population in Reunion Island /Verger, Eric /Eymard-Duvernay, Sabrina /Amiri, Sarah Nourly, N. Tarnus, M. Gauvreau-Béziat, J. Du Chaffaut, L. Oseredczuk, M. Allès, B. Méjean, C. French overseas region dietary habits assessment tool food frequency questionnaire Background: To date, there is no specific food frequency questionnaire (FFQ) to assess dietary habits in any of the French overseas regions. Objectives: This study aimed to describe the development of a culture and context-specific semiquantitative FFQ for use among the adult population in Reunion Island, to assess its reproducibility and its relative validity compared with 24-h dietary recalls (DRs). Methods: The CARI (observatoire des Comportements Alimentaires a la ReunIon) FFQ was adapted from the NutriNet-Sante FFQ, with a revised list of 181 food and beverage items reflecting local dietary practices and nutritional concerns. To assess its reproducibility, the FFQ was administered twice, 4 wk apart, to a purposive sample of 108 adults in Reunion Island. During the same period, participants also completed a weekly DR to evaluate the FFQ's validity. Reproducibility and validity were assessed for 18 food groups, energy, and 38 nutrients using correlations, cross-classification, and weighted kappa. Results: Regarding reproducibility, we found a median rank correlation of 0.56 (nutrients) and 0.64 (food groups). Most participants were correctly classified with a median of 78% (nutrients) and 83% (food group), whereas gross misclassification was low (2.8% and 0.9%, respectively). We found a median weighted kappa of 0.44 (nutrients) and 0.47 (food groups). Regarding validity, we found a median crude rank correlation of 0.51 (nutrients) and 0.43 (food groups). Most participants were correctly classified with a median agreement of 71% for nutrients and of 68% for food groups, whereas gross misclassification was low (1.9% and 0.9%, respectively). We found a median weighted kappa of 0.32 (nutrients) and 0.27 (food groups). Conclusions: The CARI FFQ has a moderate to good level of validity for ranking food and nutrient intakes, and a good level of reproducibility, supporting its use for dietary assessment in Reunion Island. 2025 text https://www.documentation.ird.fr/hor/fdi:010095517 fdi:010095517 Verger Eric, Eymard-Duvernay Sabrina, Amiri Sarah, Nourly N., Tarnus M., Gauvreau-Béziat J., Du Chaffaut L., Oseredczuk M., Allès B., Méjean C.. Development, reproducibility, and validity of a semiquantitative food frequency questionnaire for use among the adult population in Reunion Island. 2025, 9 (11), 107571 [11 ] EN REUNION