translation and psychometric evaluation of the persian yale food addiction scale 2.0 (yfas 2.0): a cross-sectional study

Background and objective: the emerging field of food addiction research highlights the necessity of a robust assessment instrument. this study undertook the translation and psychometric evaluation of the yale food addiction scale 2.0 (yfas 2.0), recognizing its potential as a vital tool in this area. methods: this cross-sectional study was conducted on 398 employees in ahvaz city in two phases: 1- translation of the instrument and 2- examination of the psychometric properties of the instrument, including face validity, content validity, construct validity (confirmatory factor analysis, convergent validity, and discriminant validity), criterion validity, reliability (including internal consistency, stability, standard error of measurement), and responsiveness to change. data analysis was performed using spss version 26 and amos version 22. findings: the study demonstrated robust face and content validity through qualitative and quantitative evaluations. assessment of construct validity revealed that a single-factor structural equation model adequately fit the data. convergent validity was supported by the significant correlation observed with garner's eating attitude test, and discriminant validity was evident through significant bmi-related differences. criterion validity was also confirmed. high internal consistency was indicated by a cronbach's α of 0.95 for the entire scale. moreover, all stability and standard error of measurement parameters were within acceptable limits. finally, the instrument showed appropriate responsiveness to change, as indicated by an area under the roc curve of 0.981. conclusion: the favorable psychometric characteristics of the persian yfas 2.0, in this study, strongly support its broad application for evaluating food addiction among persian speakers.