This article assesses the discriminant validity of the Measure of Eating Compulsivity 10 (MEC10) and the Modified Yale Food Addiction Scale 2.0 (mYFAS2.0) in relation to the Binge Eating Scale (BES) among 717 inpatients with severe obesity. Discriminant validity refers to the extent to which two measures of similar but distinct constructs show low enough correlations to be considered distinct. The study used structural equation modeling (SEM) to estimate latent correlations between the scales. The results showed that the mYFAS2.0, considered the gold standard for measuring food addiction (FA), had strong discriminant validity with both MEC10 and BES, indicating that it measures a distinct construct from these scales. In contrast, the MEC10 showed no discriminant validity with the BES, suggesting it may measure binge eating behaviors rather than FA. The study highlights the importance of testing discriminant validity to ensure accurate measurement of constructs, as poor measurement practices can lead to replication issues in psychology. The findings suggest that MEC10 is more closely related to binge eating behaviors than to FA, and thus may not be an appropriate measure of FA. The study also discusses the importance of discriminant validity in clinical and research settings, emphasizing the need for accurate measurement of constructs to avoid misdiagnosis and ensure valid results. The results support the use of mYFAS2.0 as a reliable measure of FA, while MEC10 may be more suitable for assessing binge eating behaviors. The study underscores the importance of rigorous psychometric testing and the need for further research to confirm these findings in different populations.This article assesses the discriminant validity of the Measure of Eating Compulsivity 10 (MEC10) and the Modified Yale Food Addiction Scale 2.0 (mYFAS2.0) in relation to the Binge Eating Scale (BES) among 717 inpatients with severe obesity. Discriminant validity refers to the extent to which two measures of similar but distinct constructs show low enough correlations to be considered distinct. The study used structural equation modeling (SEM) to estimate latent correlations between the scales. The results showed that the mYFAS2.0, considered the gold standard for measuring food addiction (FA), had strong discriminant validity with both MEC10 and BES, indicating that it measures a distinct construct from these scales. In contrast, the MEC10 showed no discriminant validity with the BES, suggesting it may measure binge eating behaviors rather than FA. The study highlights the importance of testing discriminant validity to ensure accurate measurement of constructs, as poor measurement practices can lead to replication issues in psychology. The findings suggest that MEC10 is more closely related to binge eating behaviors than to FA, and thus may not be an appropriate measure of FA. The study also discusses the importance of discriminant validity in clinical and research settings, emphasizing the need for accurate measurement of constructs to avoid misdiagnosis and ensure valid results. The results support the use of mYFAS2.0 as a reliable measure of FA, while MEC10 may be more suitable for assessing binge eating behaviors. The study underscores the importance of rigorous psychometric testing and the need for further research to confirm these findings in different populations.