Maria P Koliou, Chrysoula Karaiskou, Charalampos Eleftheriadis, Dimitris Skalkos
Background: Eating-rate regulation is a multidimensional behavioral process shaped by oral-processing dynamics, interoceptive cues, sensory engagement, and contextual influences. Despite its relevance, no validated self-report instrument currently assesses these mechanisms. Methods: The Food Consumption Rate Questionnaire (FCRQ) was developed as a behaviorally informed tool for measuring eating-rate regulation. Item generation followed a theory-driven process supported by expert review, forward-backward translation, and pilot testing. Structural validity was examined through Exploratory Factor Analysis (Principal Axis Factoring, Promax rotation) and a theory-driven Confirmatory Factor Analysis evaluating the proposed four-domain model. Reliability was assessed using Cronbach's α and corrected item-total correlations. Behavioral heterogeneity was explored using hierarchical and k-means cluster analysis. Results: A clear four-factor structure emerged-Slowness, Awareness of Eating Rate, External Factors, and Awareness & Enjoyment-explaining 42.77% of the variance. CFA indicated acceptable model fit (CFI = 0.93, TLI = 0.91, RMSEA = 0.052), supporting the adequacy of the theoretical structure. Reliability indices were consistent with the multidimensional nature of the construct. All four domains were positively correlated. Cluster analysis identified distinct behavioral profiles, illustrating the instrument's discriminative capacity. Conclusions: The FCRQ provides the first behaviorally informed, psychometrically evaluated framework for assessing eating-rate regulation. The instrument demonstrates a coherent theoretical structure, satisfactory early-stage validity, and the ability to differentiate meaningful behavioral patterns. Continued refinement and validation across diverse populations will further establish the FCRQ as a robust measure for behavioral-nutrition research and practice.