Objectives This study aimed at examining the reliability and validity of the Teruel Orthorexia Scale (TOS) among a sample of Lebanese adolescents (15 to 18 years old). Methods This is a cross-sectional study that was conducted between May and June 2020 and had enrolled 555 Lebanese adolescents. To assess the internal structure of the TOS scale, we administered the confirmatory factor analysis based on polychoric correlation matrix using Weighted Least Squares with Means and Variance Adjusted estimation (WLSMV) method in Mplus v 7.2 as suggested in the original validation paper. To assess the degree to which the Lebanese adaptation converges with the original scale, we have conducted the Multigroup Confirmatory Factor Analysis (MGCFA; estimated as CFA) between the data reported in the current paper and from the original validation paper. Results The mean age of the participants was 16.66 ± 1.01 years, with 76.1% females. The bi-dimensional model fitted the data well (χ 2 (118) = 429.09; p < 0.001; CFI = 0.954; RMSEA = 0.069[0.062, 0.076]). The latent factors were highly correlated ( ρ = 0.74; p < 0.001), and the strength of the standardized factor loadings was adequate on both factors (i.e., all > 0.60). The fit indices of the scalar model were at the boundary of the threshold and thus, with some pinch of caution, it might be interpreted as invariant (i.e., having equal item intercepts across groups). We have identified latent mean differences in orthorexia nervosa (0.30; p < 0.001), where Spanish individuals scored higher, but we did not find any differences in the healthy eating (0.03; p = 0.636). Higher DOS scores were significantly correlated with higher scores on the TOS subscale OrNe ( r = 0.715; p < 0.001) as well as with higher scores on the TOS subscale HeOR ( r = 0.754; p < 0.001). Higher ORTO-R scores were significantly associated with less TOS OrNe ( r = − 0.437; p < 0.001) and TOS HeOr ( r = − 0.305; p < 0.001) scores, respectively. Conclusion The Arabic version of the TOS can be considered a reliable valuable instrument to assess the ON tendencies and behaviors in Lebanese adolescents, emphasizing the fine contrast between ON’s two dimensions: healthy vs. pathological. Level V Opinions of authorities, based on descriptive studies, narrative reviews, clinical experience, or reports of expert committees.

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Background The profile of adolescents with orthorexic eating behaviors remains to be explored. This study is the first to explore the typology of Lebanese adolescents from a large non-clinical sample based on orthorexia nervosa (ON) and healthy orthorexia (HO). Method A total of 555 adolescents (aged between 15 and 18 years) completed a set of questionnaires assessing orthorexic behaviors, self-esteem, stress, depressive and anxiety symptoms. Cluster analysis based on ON and HO scores was used to identify the typology of the sample. More precisely, this analysis was used to reveal and distinguish between naturally occurring subgroups of individuals with different orthorexic eating profiles, within the studied sample. Further, a series of one-way ANOVA was used to compare observed clusters based on their scores on used questionnaires. This analysis was used to capture the behavioral and psychological differences between previously yielded subgroups of individuals. Results Cluster analysis based on ON and HO scores yielded 3 distinct groups: “Low orthorexia”, “Moderate in-between orthorexia” and “High in-between orthorexia”. While the first group represented individuals with no particular (healthy or pathological) interest in healthy eating, the two latter groups represented those with respectively moderate and high degrees of an interest in healthy eating that has both pathological and healthy aspects. Significant differences between clusters regarding their levels of stress, depression, anxiety and self-esteem was observed, yet they were found to be negligible due to poor effect sizes. Conclusion Findings from this study suggest that ON and HO can indeed co-occur among adolescents, that this co-occurrence can be experienced at different severity levels. Low effect sizes for ANOVA comparisons may suggest the possibility of the co-occurrence of ON and HO reducing the negative effects of ON behavior to some degree. The potential role of confusion around what constitutes "healthy eating" in the emergence of these "in-between orthorexia" profiles is put forward.

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