The relation of orthorexia with lifestyle habits: Arabic versions of the Eating Habits Questionnaire and the Dusseldorf Orthorexia Scale

On Orthorexia Nervosa: A Systematic Review of Reviews

INTRODUCTION

Orthorexia nervosa (ON), characterized by a pathological preoccupation with "extreme dietary purity," is increasingly observed as a mental health condition among young adults and the general population. However, its diagnosis is not formally recognized and has remained contentious.

OBJECTIVE

In this systematic review, we attempt to overview previous reviews on ON, focusing on the methodological and conceptual issues with ON. This would serve both as a summary and a way to highlight gaps in earlier research.

METHODS

This systematic review took reference from the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) reporting guidelines, and using combinations of the search terms ("orthorexia" OR "orthorexia nervosa" OR "ON") AND ("review" OR "systematic review" OR "meta-analysis"), a literature search was performed on EMBASE, Medline and PsycINFO databases from inception up to October 31, 2023. Articles were included if (1) they were written or translated into English and (2) contained information pertaining to the diagnostic stability or validity of ON, or instruments used to measure ON symptoms and behaviors. Only review articles with a systematic literature search approach were included.

RESULTS

A total of 22 reviews were qualitatively reviewed. Several studies have reported variable prevalence of ON and highlighted the lack of thoroughly evaluated measures of ON with clear psychometric properties, with no reliable estimates. ORTO-15 and its variations such as ORTO-11, ORTO-12 are popularly used, although their use is discouraged. Existing instruments lack specificity for pathology and several disagreements on the conceptualization and hence diagnostic criteria of ON exist.

DISCUSSION

Previous reviews have consistently highlighted the highly variable (and contradictory) prevalence rates with different instruments to measure ON, lack of stable factor structure and psychometrics across ON measures, paucity of data on ON in clinical samples, and a need for a modern re-conceptualization of ON. The diagnosis of ON is challenging as it likely spans a spectrum from "normal" to "abnormal," and "functional" to "dysfunctional." "Non-pathological" orthorexia is not related to psychopathological constructs in the same way that ON is.

Exploration of orthorexia nervosa and diagnostic overlap with eating disorders, anorexia nervosa and obsessive-compulsive disorder

OBJECTIVE

Orthorexia nervosa (ON) is characterized as obsessional healthy eating that results in malnutrition and/or psychosocial impairment. Yet, ON shares theoretical overlap with eating disorders (EDs), especially anorexia nervosa (AN), as well as obsessive-compulsive disorder (OCD). This study aimed to further understand ON and its overlap with related disorders by assessing the ability of ON for detecting the presence/absence of threshold ED, AN, and OCD symptoms.

METHOD

An observational survey was completed by 197 participants recruited through eating disorder, dieting, and mental health support groups. Receiver operating characteristic (ROC) curve analyses determined the predictive ability of ON symptoms (assessed by Eating Habits Questionnaire [EHQ] orthorexia nervosa [OrNe] and healthy orthorexia [HeOr] subscales, and the Orthorexia Nervosa Inventory [ONI]) for detecting disordered eating symptoms (determined by Eating Disorder Examination Questionnaire [EDE-Q] global cut-scores), probable AN (determined by EDE-Q cut-scores and body mass index [BMI] <18.5), and OCD symptoms and obsessional thinking (assessed by the Revised Obsessive-Compulsive Inventory [OCI-R]).

RESULTS

Results showed both the ONI and EHQ OrNe measures are able to adequately predict ED symptoms and AN; however, both were poor to moderate at detecting OCD symptoms and obsessional thinking. Healthy orthorexia was poor to moderate at detecting outcomes.

DISCUSSION

These results suggest that ON, as it is currently operationalized, may be more closely related to EDs than OCD, and that ON may represent a subtype of AN. Results also support healthy orthorexia as a distinct construct to ON. While results are limited by the lack of definitive ON diagnostic criteria, findings suggest that treatments developed for EDs might be most suited to ON.

PUBLIC SIGNIFICANCE

ON has been proposed as a psychiatric disorder, and it shares theoretical overlap with several existing disorders. This study adopts a novel approach to assessing and exploring the overlap of ON with EDs, AN and OCD. Results suggest that ON shares more overlap with EDs and might best be understood as a subtype of EDs or AN.

Prevalence of Orthorexic Tendencies and Their Correlates Among Lebanese Patients with Cancer

Individuals with cancer face daily challenges regarding diet and healthy lifestyle behaviors that may lead them to better health. This quest for improved health can be exaggerated in unhealthy ways if it is not approached with moderation as occurs with a condition called orthorexia nervosa (ON). Our aim in this study was to determine the prevalence of ON tendencies and their behavioral correlates among Lebanese adults with cancer. This was a monocentric cross-sectional study, conducted between December 2021 and February 2022, involving 366 patients. We collected data via telephone and recorded answers online on a Google form. We used the Düsseldorf Orthorexia Scale (DOS) to assess orthorexic behaviors, and we checked for behavioral correlates of orthorexia through a linear regression model using the DOS score as the dependent variable. On the DOS scale, we found that 9% of these participants showed possible ON tendencies, whereas 22.2% had definite ON tendencies. Factors associated with having more ON tendencies were (a) receipt of hormonotherapy, (b) being female and (c) having breast cancer. Having prostate cancer was significantly associated with fewer ON tendencies. Our results should help improve the management of patients with cancer through programs to increase patient awareness and education.

Turkish Version of the New Instrument for Orthorexia Nervosa-Test of Orthorexia Nervosa (TON-17): A Validity and Reliability Study

This study aimed to adapt the Test of Orthorexia Nervosa- (TON-17) into Turkish and verify its validity and reliability. The study included 539 adults with a mean age of 30.2 ± 12.26 years. A reliability analysis was performed, along with a confirmatory factor analysis to test its construct validity. The time-invariance of the scale was examined by test-retest analysis, and its convergent validity was evaluated by a correlation analysis conducted to test the relationships between the scale and Eating Attitudes Test-26 and Obsessive Beliefs Questionnaire-9. Analyses were conducted using SPSS Version 28 and the AMOS-24 software. The Cronbach's α internal consistency coefficient of the total scale was found to be 0.82, suggesting a strong internal consistency. The Cronbach's α values of its factors were 0.68 for the "control of food quality", 0.64 for the "fixation on health and a healthy diet", and 0.73 for the "disorder symptoms". In addition, the test-retest reliability was found to be 0.87 for the total scale, suggesting excellent reliability. Most of the fit indices (CMIN/df, RMSEA, AGFI, NFI, and TLI) of the scale were acceptable, and the GFI indicated a good model fit. This study shows that the Turkish version of TON-17, which is a new tool with a three-factor structure to evaluate orthorexia, is a valid and reliable scale.

Attachment styles and orthorexia nervosa among Lebanese adolescents: The indirect effect of self-esteem

BACKGROUND

Orthorexia nervosa (ON), defined as the pathological obsession for pure foods, remains a novelty in the field of eating disorders. Many studies in the literature have shown that attachment styles correlate with the development of eating disorders. Patients with eating disorders were found to be more avoidant and anxious and less secure than individuals who do not have eating disorders. However, studies on the relationship between attachment styles and ON remain limited, particularly in adolescents. This study assessed the relationship between attachment styles and ON in Lebanese adolescents (15-18 years), along with evaluating the indirect effect of self-esteem on this association.

METHODS

This study used a cross-sectional design and was carried out during May-June 2020 with 555 students (15-18 years) enrolled. The Düsseldorf Orthorexia Scale was utilized to screen for ON tendencies. A linear regression was conducted taking the DOS score as the dependent variable. The PROCESS Macro was used to test the indirect effect of self-esteem between attachment styles and ON.

RESULTS

Higher fearful and preoccupied attachment styles, female gender, and more physical activity were significantly associated with more ON tendencies, whereas higher self-esteem was significantly associated with less ON tendencies. When adjusting for all sociodemographic characteristics and other attachment styles, none of the attachment styles remained significantly correlated with ON tendencies. Self-esteem mediated the association between secure attachment style and ON and between dismissive attachment style and ON.

CONCLUSIONS

The rise in ON warrants further studies and investigations to raise awareness and plan behavioral interventions in order to treat it.

Healthy orthorexia vs. orthorexia nervosa: Italian validation of the Teruel Orthorexia Scale (TOS)

PURPOSE

Orthorexia nervosa (OrNe) is a potentially pathological condition characterized by a fixation on healthy diet. An increasing number of studies have been conducted on this mental preoccupation, but the validity and reliability of some of the psychometric instruments employed in its assessment are still under debate. Among these measures, the Teruel Orthorexia Scale (TOS) seems to be promising, given that it allows to differentiate between OrNe and other non-problematic forms of interest with healthy eating, named as healthy orthorexia (HeOr). The aim of this study was to examine the psychometric properties of an Italian version of the TOS, by testing its factorial structure, internal consistency, test-retest reliability, and validity.

METHOD

Through an online survey, we recruited 782 participants from different regions of Italy, asking them to complete the following self-report instruments: TOS, EHQ, EDI-3, OCI-R, and BSI-18. From the initial sample, 144 participants agreed to complete a second TOS administration 2 weeks later.

RESULTS

Data confirmed the validity of the 2-correlated factors structure of the TOS. The questionnaire also showed good reliability, both in terms of internal consistency and temporal stability. With regard to the TOS validity, results showed that OrNe was significantly and positively associated with measures of psychopathology and psychological distress, while HeOr showed no correlations or negative associations with the above-mentioned measures.

CONCLUSION

Based on these results, the TOS can be considered a promising measure for the assessment of both pathological and non-problematic forms of orthorexic eating behavior also in Italian population.

LEVEL OF EVIDENCE

Level V, descriptive cross-sectional study.

Orthorexic eating behaviors are not all pathological: a French validation of the Teruel Orthorexia Scale (TOS)

As no French validated measurement tool distinguishing healthy orthorexia (HeOr) from orthorexia nervosa (OrNe) currently exists, this study aimed at examining psychometric properties of the French version of the Teruel Orthorexia Scale (TOS). A sample of 799 participants (Mean [SD] age: 28.5 [12.1] years-old) completed the French versions of the TOS, the Düsseldorfer Orthorexia Skala, the Eating Disorder Examination-Questionnaire, and the Obsessive-Compulsive Inventory-Revised. Confirmatory factor analysis and exploratory structural equation modeling (ESEM) were used. Although the bidimensional model, with OrNe and HeOr, of the original 17-item version showed an adequate fit, we suggest excluding items 9 and 15. The bidimensional model for the shortened version provided a satisfactory fit (ESEM model: CFI = .963, TLI = .949, RMSEA = .068). The mean loading was .65 for HeOr and .70 for OrNe. The internal consistency of both dimensions was adequate (α_HeOr = .83 and α_OrNe = .81). Partial correlations showed that eating disorders and obsessive-compulsive symptomatology measures were positively related to OrNe and unrelated or negatively related to HeOr. The scores from the 15-item French version of the TOS in the current sample appears to present an adequate internal consistency, pattern of associations in line with what was theoretically expected, and promising for differentiating both types of orthorexia in a French population. We discuss why both dimensions of orthorexia should be considered in this area of research.

The indirect role of orthorexia nervosa and eating attitudes in the association between perfectionism and muscle dysmorphic disorder in Lebanese male University students - results of a pilot study

BACKGROUND

The literature highly concentrates on disorders related to body image among women but only minimally when it comes to the male population; hence, in order to provide general practitioners, and primary care physicians in general, and psychiatrists in particular, with additional information concerning muscle dysmorphia among male university students in Lebanon, this study seemed essential, and was therefore conducted to (1) identify the prevalence of MDD, and (2) evaluate the indirect effect of eating attitudes in general and orthorexia nervosa in particular, in the association between perfectionism and muscle dysmorphic disorder (MDD) among a sample of male university students.

METHODS

In this cross-sectional study conducted between September 2021 and May 2022, 396 male university students from multiple universities in Lebanon filled the online Arabic questionnaire.

RESULTS

The results showed that 26 (6.6%) of the participants had MDD. Orthorexia nervosa and eating attitudes mediated the association between perfectionism and MDD; higher perfectionism was significantly associated with higher ON and more inappropriate eating; higher ON and more inappropriate eating were significantly associated with higher MDD, whereas perfectionism had a significant total direct effect on MDD. The high prevalence of MDD among male university students in Lebanon implies further investigation on the national level in the country.

CONCLUSION

Awareness campaigns among the university students could be adopted at the national level to increase the level of knowledge on the concepts of obsessive self-destructive perfectionism, orthorexia nervosa and muscle dysmorphia.

Translation and validation of the Chinese version of the orthorexia nervosa assessment questionnaires among college students

PURPOSE

The main objective of the study was to translate, validate, and compare the Chinese ORTO scales (ORTO-15 and ORTO-R). The secondary objective was to assess factors that may be related with risk of orthorexia nervosa (ON).

METHODS

Two cross-sectional surveys were conducted on March-to-June 2021 for ORTO-15 and April 2022 for ORTO-R. ORTO questionnaires were translated into Chinese using the forward-backward-forward method. Exploratory factor analysis (EFA), discriminant validity and confirmatory factor analysis (CFA) were used to examine the construct validity of the questionnaires. The internal consistency was assessed using the Cronbach alpha coefficient and the test-retest reliability. Multivariate linear regression analysis was used to explore potential factors related with ON scores.

RESULTS

Totally, 1289 and 1084 eligible participants were included for assessment of ORTO-15 and ORTO-R, with the mean age of 20.9 ± 2.0 years and 21.0 ± 2.3 years. The internal consistency of Chinese ORTO-15 scale and ORTO-R scale were both satisfactory (α = 0.79, ICC = 0.79; α = 0.77, ICC = 0.82). However, all ORTO-15 models showed a poor fit using CFA whereas the ORTO-R was characterized by acceptable goodness-of-fit. Multivariate linear regression indicated that physical activities and mental disorders were positively associated with ON risk assessed by both ORTO-R and ORTO-15.

CONCLUSION

The Chinese ORTO-R scale was a more reliable tool to screen for ON tendencies than the Chinese version of ORTO-15. Mental disorders and physical activities might be associated with the increased ON risk.

LEVEL OF EVIDENCE

Level V (descriptive cross-sectional study).

A consensus document on definition and diagnostic criteria for orthorexia nervosa

PURPOSE

Since the term orthorexia nervosa (ON) was coined from the Greek (ὀρθός, right and ὄρεξις, appetite) in 1997 to describe an obsession with "correct" eating, it has been used worldwide without a consistent definition. Although multiple authors have proposed diagnostic criteria, and many theoretical papers have been published, no consensus definition of ON exists, empirical primary evidence is limited, and ON is not a standardized diagnosis. These gaps prevent research to identify risk and protective factors, pathophysiology, functional consequences, and evidence-based therapeutic treatments. The aims of the current study are to categorize the common observations and presentations of ON pathology among experts in the eating disorder field, propose tentative diagnostic criteria, and consider which DSM chapter and category would be most appropriate for ON should it be included.

METHODS

47 eating disorder researchers and multidisciplinary treatment specialists from 14 different countries across four continents completed a three-phase modified Delphi process, with 75% agreement determined as the threshold for a statement to be included in the final consensus document. In phase I, participants were asked via online survey to agree or disagree with 67 statements about ON in four categories: A-Definition, Clinical Aspects, Duration; B-Consequences; C-Onset; D-Exclusion Criteria, and comment on their rationale. Responses were used to modify the statements which were then provided to the same participants for phase II, a second round of feedback, again in online survey form. Responses to phase II were used to modify and improve the statements for phase III, in which statements that met the predetermined 75% of agreement threshold were provided for review and commentary by all participants.

RESULTS

27 statements met or exceeded the consensus threshold and were compiled into proposed diagnostic criteria for ON.

CONCLUSIONS

This is the first time a standardized definition of ON has been developed from a worldwide, multidisciplinary cohort of experts. It represents a summary of observations, clinical expertise, and research findings from a wide base of knowledge. It may be used as a base for diagnosis, treatment protocols, and further research to answer the open questions that remain, particularly the functional consequences of ON and how it might be prevented or identified and intervened upon in its early stages. Although the participants encompass many countries and disciplines, further research will be needed to determine if these diagnostic criteria are applicable to the experience of ON in geographic areas not represented in the current expert panel.

LEVEL OF EVIDENCE

Level V: opinions of expert committees.

Association between the bi-dimensional aspect of orthorexia and healthy behaviors among lebanese adolescents

BACKGROUND

Recently, there has been a blooming focus on "eating healthy and clean", with the ideal of being healthy becoming a popular lifestyle trend. Previous research suggested the presence of two forms of orthorexia: Orthorexia Nervosa (OrNe) and Healthy Orthorexia (HeOr). Taking into consideration that orthorexia thoughts are led by the desire to reach an optimal physical health, the dedication to a healthy living may require healthy lifestyle habits: smoking cessation, moderate alcohol intake, and increased physical activity. The main study aim was to determine, among Lebanese adolescents, the association between healthy behaviors and the two likely forms of orthorexia (OrNe and HeOr), given that the adolescent phase is a risky period in the development of eating disorders.

METHODS

A cross-sectional study, conducted between January and April 2022, enrolled 444 adolescents aged between 14 and 18 years, with an equitable random sample from all the Lebanese governorates (mean age 16.23 ± 1.15 years; 60.1% females). The Teruel Orthorexia Scale (TOS) was used to assess orthorexic eating tendencies. The Lebanese Waterpipe Dependence Scale, the Fagerström Test for Nicotine Dependence and the Alcohol Use Disorder Identification Test scales, all validated in adolescents, were used to evaluate the association between orthorexia and healthy behaviors.

RESULTS

Higher TOS OrNe scores were significantly and highly correlated with the TOS HeOr scores (r = 0.68; p < 0.001). In the bivariate analysis, waterpipe smoking was weakly but significantly associated with more OrNe, whereas more physical activity was significantly and moderately associated with more HeOr. After adjusting over all sociodemographic characteristics, other behaviors and the other dimension of orthorexia, more alcohol use disorder was significantly but strongly associated with higher OrNe, whereas more physical activity remained significantly associated with higher HeOr.

CONCLUSION

In light of our results, OrNe and HeOr might be considered as different entities, mainly in their associations with alcohol consumption and physical activity. This supports the hypothesis of OrNe being a new form of eating disorder, whereas HeOr possibly showing protective characteristics. Orthorexia is still a topic of controversy, especially in the probable presence of two facets that are still difficult to differentiate.

Disordered eating and the meat-avoidance spectrum: a systematic review and clinical implications

PURPOSE

Meat avoidance has long been thought to be related to eating psychopathology; however, research does not necessarily support this notion. Furthermore, commonly used eating disorder scales may be picking up on normal meat-avoiding behaviours in vegetarians and vegans. As such, we systematically reviewed the association between vegetarianism, veganism, and disordered eating, and reviewed the psychometric properties of eating disorder scales for use in these populations.

METHODS

We searched electronic databases MEDLINE, PsychINFO, and CINAHL for literature published until June 2021.

RESULTS

Forty-eight studies met eligibility criteria, with no consensus as to whether meat avoidance was associated with higher rates of disordered eating. Most studies reported a significant positive association with both vegetarianism and veganism, and orthorexia nervosa. Six studies provided evidence for the use of eating disorder measures in vegetarians and vegans, reporting poor psychometric fit among all scales.

CONCLUSION

This systematic review highlights the extent to which vegetarians and vegans have been highly understudied, with limited research suggesting higher levels of orthorexia nervosa behaviours in vegetarians and vegans. Furthermore, our results provide tentative evidence that the factorial validity of commonly used eating disorder scales, such as the EDE-Q, may be poor in vegans.

LEVEL OF EVIDENCE

Level I, systematic review.

Any overlap between orthorexia nervosa and obsessive-compulsive disorder in Lebanese adults? Results of a cross-sectional study and validation of the 12-item and 4-item obsessive-compulsive inventory (OCI-12 and OCI-4)

BACKGROUND

Orthorexia Nervosa (ON), a compulsive obsession with vigorous eating, has increasingly caught researchers' attention. Although Orthorexia Nervosa has not been labeled an eating disorder, research about ON highlighted a strong link with anorexia nervosa or obsessive-compulsive disorder (OCD). Therefore, this study aimed to (1) validate the Arabic version of the Obsession-Compulsion Inventory (OCI-12 and OCI-4) and (2) check if there is an overlap between ON and OCD among a sample of Lebanese adults.

METHODS

This cross-sectional study involved 487 Lebanese participants between July and August 2021. The Dusseldorf Orthorexia Scale (DOS) was used to assess ON; scores between 25 and 29 indicate probable ON, whereas scores ≥ 30 indicate ON tendencies. A confirmatory factor analysis (CFA) was carried out using SPSS AMOS v.24 on the OCI-12 and OCI-4 scales' items. The root mean square error of approximation (RMSEA) statistic, the Tucker Lewis Index (TLI) and the comparative fit index (CFI) were used to evaluate the goodness-of-fit of the model.

RESULTS

The CFA results indicated an excellent fit of the model: the Maximum Likelihood Chi-Square = 147.73 and Degrees of Freedom = 48, which gave a χ2/df = 3.08, TLI = 0.934, CFI = 0.952, and RMSEA = 0.065 [95% CI 0.054-0.078]. The fit indices of the one-factor structure of the OCI-4 were excellent as well: χ2/df = 6.15/2 = 3.08, TLI = 0.95, CFI = 0.98 and RMSEA = 0.065 [95% CI 0.007-0.127]. The Area Under the Curve was 0.600 [95% CI 0.524-0.674]. There was no cutoff value that showed good sensitivity or specificity at the same time. At the DOS cutoff of 25, sensitivity was 19.1%, whereas the specificity was 90.6%. The positive and negative predictive values (PPV and NPV) at this cutoff value were 24.4% and 88.7% respectively. At the DOS cutoff of 30, sensitivity was 8.8%, whereas the specificity was 94.3%. The PPV and NPV at this cutoff value were 10.6% and 92.5% respectively. The results showed that higher total OCD scores (Beta = 0.15) were significantly associated with more ON tendencies. Moreover, higher OCD washing scores (Beta = 0.52), physical activity index (Beta = 0.06), and Body Mass Index (Beta = 0.17) were significantly associated with more ON tendencies.

CONCLUSION

The present results suggest that ON, as measured by the DOS, shares more common features with disordered eating and cannot adequately predict the presence of OCD symptoms.

Eating disorders and their relationship with menopausal phases among a sample of middle-aged Lebanese women

OBJECTIVES

The objective of our study was to evaluate the association between the transition to menopause, body dissatisfaction, and abnormal eating habits (restrained eating, binge eating, and orthorexia nervosa) in a sample of middle-aged Lebanese women.

METHODS

A cross-sectional study conducted between July 2019 and January 2020 enrolled 1001 women aged 40 years and above from all Lebanese governorates. Data were collected by face-to-face interviews with all participants. The Body dissatisfaction subscale of the Eating Disorder Inventory‑second version was used to assess body dissatisfaction, whereas the Binge Eating Scale, Dutch Restrained Eating Scale, ORTO-15, Dusseldorf Orthorexia Scale (DOS), and Teruel Orthorexia Scale (TOS) were used to assess eating disorders (binge eating, restrained eating and orthorexia nervosa respectively. Multivariable analysis of covariance (MANCOVA) was used to compare multiple measures among the three menopausal phases, after adjustment over potential confounding variables (age, monthly income, body mass index, marital status, education level, and body dissatisfaction).

RESULTS

Postmenopause was significantly associated with more orthorexia nervosa tendencies (lower ORTO-15 scores) than premenopause (β = - 1.87; p = 0.022). Perimenopause was associated with more binge eating (β = 1.56; p = 0.031), and less orthorexia nervosa (as measured by the DOS) than premenopause, with this association tending to significance (β  = - 1.10; p = 0.051). Furthermore, higher body dissatisfaction was significantly associated with higher restrained eating (β = 0.02; p < 0.001), binge eating (β = 0.48; p < 0.001), and orthorexia nervosa as measured by ORTO-15 (β = - 0.17; p < 0.001) and TOS (β = 0.08; p = 0.002), but not DOS.

CONCLUSION

Our study showed that menopausal stages are associated with some disordered eating behaviors (binge eating and orthorexia nervosa) among middle-aged women. Those results may serve as a first step towards spreading awareness among women within this age group regarding eating attitudes. Moreover, healthcare professionals should screen for the presence of disordered eating during those women's routine visits to the clinics.