BackgroundThe Inflexible Eating Questionnaire (IEQ) is an 11-item instrument designed to evaluate the behavioural and psychological components of inflexible eating. However, the psychometric properties of the instrument have been infrequently examined, and no previous work has examined its utility in the context of the Middle East.MethodsA total of 826 Lebanese citizens and residents completed a novel Arabic translation of the IEQ, as well as previously validated measures of body appreciation, functionality appreciation, and disordered eating.ResultsThe unidimensional factor structure of the IEQ was upheld through both exploratory and confirmatory factor analyses, with all 11 items retained. We obtained evidence of scalar invariance across gender and found that there were no significant differences in observed IEQ scores between men and women. IEQ scores were also found to have adequate composite reliability and adequate patterns of concurrent validity.ConclusionThe present findings provide support for the psychometric properties of the Arabic version of the IEQ in examining inflexible eating in Arabic-speaking adults in Lebanon.Plain English SummaryInflexible or rigid dietary restraint reflects an all-or-none approach that encompasses feeling compelled to obey a set of self-imposed dieting rules (e.g., avoiding high-calorie food, calorie counting, fasting to lose weight and/or skipping meals), having a sense of self-control and feeling empowered when adhering to these rules, and not respecting or following internal/external cues of hunger, satiety, and appetite. Therefore, the inflexible eating construct is composed of two dimensions, the first one is behavioural (i.e., obeying restrictive dietary rules) and the second one is psychological (i.e., the belief that following these rules is a consistent must). Until recently, the measures designed to assess inflexible eating focused on the behavioral dimension, while omitting to account for the psychological processes underlying the construct. To bridge this gap, the Inflexible Eating Questionnaire (IEQ), an 11-item self-report measure, was developed to assess both the behavioural and psychological components of dietary restraint. To date, the IEQ is not yet validated in Arabic. Through the present study, we aimed to examine the psychometric properties of an Arabic translation of the IEQ, which would in turn facilitate improved research and clinical practices related to dietary restraint in Arabic-speaking nations. Overall, findings provided support for the good psychometric qualities of the Arabic version of the IEQ, which suggests its utility for detecting inflexible eating in Arabic-speaking adults.