Functional assessment of restrictive eating: A three-study clinically heterogeneous and transdiagnostic investigation

The Lifetime Prevalence of Non-Suicidal Self-Injury in Children and Adolescents With Eating Disorders-A Systematic Review and Meta-Analysis

OBJECTIVE

Eating disorders (EDs) and non-suicidal self-injury (NSSI) are both phenomena with onset in adolescence. Their co-occurrence is associated with higher symptom severity and an elevated risk of suicide. In this meta-analysis, we examine the lifetime prevalence of NSSI in youth with EDs.

METHODS

We searched PsycInfo, PubMed and previously published systematic reviews for studies reporting on lifetime NSSI prevalence among children and adolescents (19 years or younger) with an ED (anorexia nervosa, bulimia nervosa, binge eating or other specified feeding and EDs) published until June 2024. A generalized linear mixed model meta-analysis was performed to estimate the pooled prevalence. Meta-regressions and multivariate meta-analyses were conducted to estimate separate prevalence rates based on ED diagnosis and care frame (e.g., inpatient vs. outpatient), respectively.

RESULTS

Fifteen studies comprising 3311 children and adolescents were included. Pooled lifetime NSSI prevalence across all ED diagnoses was 34.2% [CI: 27.5%-41.7%]. Heterogeneity was large (I2 = 93.8%). Lifetime NSSI prevalence rates were significantly higher for participants with bulimia nervosa (53.6%) and those with anorexia nervosa binge-eating/purging type (51.9%) than for participants with anorexia nervosa restrictive type (15.8%).

DISCUSSION

The small number of studies and the large heterogeneity limit the conclusiveness of this meta-analysis. Results suggest an even higher prevalence of lifetime NSSI in adolescents with an ED than in adults with an ED. The results support previous findings indicating higher prevalence rates of NSSI for EDs associated with binge eating and purging behaviours than for restrictive EDs.

Exaggerated frontoparietal control over cognitive effort-based decision-making in young women with anorexia nervosa

Effortful tasks are generally experienced as costly, but the value of work varies greatly across individuals and populations. While most mental health conditions are characterized by amotivation and effort avoidance, individuals with anorexia nervosa (AN) persistently engage in effortful behaviors that most people find unrewarding (food restriction, excessive exercise). Current models of AN differentially attribute such extreme weight-control behavior to altered reward responding and exaggerated cognitive control. In a novel test of these theoretical accounts, we employed an established cognitive effort discounting paradigm in combination with fMRI in young acutely underweight female patients with AN (n = 48) and age-matched healthy controls (HC; n = 48). Contrary to the hypothesis that individuals with AN would experience cognitive effort (operationalized as N-back task performance) as less costly than HC participants, groups did not differ in the subjective value (SV) of discounted rewards or in SV-related activation of brain regions involved in reward valuation. Rather, all group differences in both behavior (superior N-back performance in AN and associated effort ratings) and fMRI activation (increased SV-related frontoparietal activation during decision-making in AN even for easier choices) were more indicative of increased control. These findings suggest that while effort discounting may be relatively intact in AN, effort investment is high both when performing demanding tasks and during effort-based decision-making; highlighting cognitive overcontrol as an important therapeutic target. Future research should establish whether exaggerated control during effort-based decision-making persists after weight-recovery and explore learning the value of effort in AN with tasks involving disorder-relevant effort demands and rewards.

Changes in Emotion Regulation During the Course of Dialectical Behaviour Therapy: Effects on Non-Suicidal Self-Injury and Binge Eating Across Two Samples

Dialectical Behaviour Therapy (DBT) has demonstrated effectiveness in reducing harmful behaviours associated with emotion dysregulation, including non-suicidal self-injury (NSSI) and binge eating. It has been hypothesized that the effects of DBT on NSSI and binge eating are the result of improvements in emotion regulation (ER); however, the extent to which changes in ER account for reductions in these behaviours is unclear. The present study leverages two unique clinical samples to examine the degree to which changes in ER influence changes in the frequency of NSSI and binge eating over the course of DBT. Participants included 189 Veterans receiving outpatient DBT and 117 civilians enrolled in a DBT Intensive Outpatient Program. Analyses examined changes in ER, binge eating and NSSI over the course of treatment, as well as the extent to which NSSI and binge eating frequency were influenced by changes in ER. In the Veteran sample, DBT led to improvements in ER abilities and significant reductions in NSSI and binge eating; however, changes in ER did not account for observed reductions in NSSI or binge eating. In the civilian sample, the effects of DBT on ER, NSSI and binge eating were nonsignificant. Our findings suggest that ER may not be the only mechanism through which DBT exerts its effects on NSSI and binge eating. The effects of DBT on ER and self-damaging behaviours may vary based on factors such as treatment setting, time in treatment and clinical severity of the sample.

Different self-damaging behaviours, similar motives? Testing measurement invariance of motives for nonsuicidal self-injury, disordered eating and substance misuse

OBJECTIVES

Theory and research suggest that distinct self-damaging behaviours (SDBs; e.g., nonsuicidal self-injury [NSSI], restrictive eating, binge eating, drug misuse, alcohol misuse) share similar motives. However, few studies have used a common self-report inventory to investigate the shared relevance and relative salience of motives for SDBs. Accordingly, the present study: (1) examined whether self-report scales assessing intrapersonal motives (i.e., relieving negative emotions, enhancing positive emotions, punishing oneself) and interpersonal motives (i.e., bonding with others, conforming with others, communicating distress, communicating strength, reducing demands) have invariant factor structures across SDBs; and (2) compared the salience of these motives across SDBs.

METHODS

1018 adults (54.6% men, Mage = 35.41 years) with a history of SDBs were allocated to the following groups: NSSI (n = 213), restrictive eating (n = 200), binge eating (n = 200), drug misuse (n = 200) or alcohol misuse (n = 205). Participants reported on their motives for engaging in their allocated SDB. Measurement invariance analyses compared the factor structures and latent means of the motive scales across SDBs.

RESULTS

The motive scales had comparable factor structures across SDBs. Intrapersonal motives were most strongly endorsed for NSSI and drug misuse. Interpersonal motives were most strongly endorsed for drug and alcohol misuse. All motives were least salient to restrictive eating.

CONCLUSIONS

Results suggest that common motives underlie distinct SDBs and that they can be adequately assessed using a single self-report inventory. However, certain motives are more relevant to some SDBs than others, with restrictive eating being the most motivationally distinct SDB. This knowledge can inform transdiagnostic models and interventions for SDBs.

Reward responsivity and habit formation in the co-occurrence of restrictive eating and nonsuicidal self-injury

Dysfunctions in reward and/or habit formation have been proposed as factors contributing individually to the maintenance of restrictive eating and nonsuicidal self-injury (NSSI). However, despite the high comorbidity between these behaviors, the associations between reward and habit formation in their co-occurrence remains unclear. This study examined self-reported reward responsivity and habit strength among individuals with co-occurring restrictive eating and NSSI (Comorbid group; n = 108) and those with one behavior only (One-behavior group; n = 113). Hierarchical logistic regression analyses assessed the association between reward and habit features and the co-occurrence of restrictive eating and NSSI, accounting for the effects of impulsivity (a characteristic commonly considered to underlie co-occurring disordered eating and NSSI). Partial correlations examined the relationships between these features and the severity of eating disorder and NSSI symptoms, also controlling for impulsivity. Lower reward responsivity was associated with the co-occurrence of restrictive eating and NSSI, even after accounting for impulsivity (p = 0.017). In exploratory analyses, this relationship was no longer significant after accounting for self-reported depression. No significant associations were found regarding habit formation and restrictive eating and NSSI co-occurrence. Lower reward responsivity was linked to increased NSSI frequency and versatility in both groups and associated with severity of eating pathology in the Comorbid group (ps < 0.05). Our findings suggest that blunted reward responsivity may relate to the co-occurrence of restrictive eating, NSSI, and depressive symptoms, as well as the severity of restrictive eating and NSSI. Reward disturbances may serve as a crucial target in the treatment of multiple self-destructive behaviors.

Understanding heterogeneity, comorbidity, and variability in depression: Idiographic models and depression outcomes

This study uses time-intensive, item-level assessment to examine individual depressive and co-occurring symptom dynamics. Participants experiencing moderate-severe depression (N = 31) completed ecological momentary assessment (EMA) four times per day for 20 days (total observations = 2480). We estimated idiographic networks using MDD, anxiety, and ED items. ED items were most frequently included in individual networks relative to depression and anxiety items. We built ridge and logistic regression ensembles to explore how idiographic network centrality metrics performed at predicting between-subject depression outcomes (PHQ-9 change score and clinical deterioration, respectively) at 6-months follow-up. For predicting PHQ-9 change score, R2 ranged between 0.13 and 0.28. Models predicting clinical deterioration ranged from no better than chance to 80 % accuracy. This pilot study shows how co-occurring anxiety and ED symptoms may contribute to the maintenance of depressive symptoms. Future work should assess the predictive utility of psychological networks to develop understanding of how idiographic models may inform clinical decisions.

Comparing self-harming intentions underlying eating disordered behaviors and nonsuicidal self-injury: Replication and extension in adolescents

OBJECTIVE

Eating disorder (ED) behaviors are often characterized as indirect forms of self-harm. However, recent research has found less clear demarcations between direct self-harming behaviors (e.g., nonsuicidal self-injury [NSSI], suicidal behaviors) than previously assumed. The aim of this study was to replicate findings of this prior research on adult populations in adolescents with a history of restrictive eating.

METHOD

A total of 117 adolescents between ages 12-14 were included in the study. Participants reported the presence and frequency of binge eating, compensatory, restrictive eating, and NSSI. Participants also reported thoughts of and intentions to hurt and kill themselves when engaging in each behavior on average. The t-tests and linear effects models were conducted to compare self-harming thoughts and intentions across behaviors.

RESULTS

Participants reported at least some intent to hurt themselves physically in the moment and in the long-term when engaging in all ED behaviors and NSSI, and reported engaging in these behaviors while thinking about suicide. Direct self-harming knowledge and intentions were most frequently reported with NSSI and longer-term knowledge and intentions via NSSI and restrictive eating. Additionally, participants reported some suicidal thoughts and intentions across behaviors.

DISCUSSION

This study replicates prior research, suggesting that adolescents engage in ED behaviors and NSSI with non-zero self-harming and suicidal thoughts and intentions. ED behaviors and NSSI may better be explained on a continuum. Implications include the recommendation of safety planning during ED treatment.

PUBLIC SIGNIFICANCE STATEMENT

This study highlights the overlap between eating disorder (ED) behaviors, nonsuicidal self-injury (NSSI), and suicide. Though clear distinctions typically exist for motives of self-harming behavior between ED behaviors (i.e., indirect, in the long run) and NSSI (i.e., direct, in the moment), this research suggests that intentions for self-harming and suicide may exist on a continuum. Clinical ED treatment should consider safety planning as part of routine interventions.

Potential applications of Schema Therapy in the treatment of adolescents with anorexia nervosa: a theoretical analysis

Purpose

The main purpose of the article is to present basic theoretical assumptions on Schema Therapy and its hypothetical application among adolescents suffering with anorexia nervosa.

Views

Anorexia nervosa is a very deadly mental disease, more frequently suffered by females than males, with the mean age of onset at approximately 14-15. Studies underline the relatively poor effectiveness of currently applied treatment methods and the need for new approaches that could be recommended for adolescent patients suffering with this disease. The results of studies conducted to date lead to the conclusion that Schema Therapy is a promising approach for this group. It is a transdiagnostic method of work that compiles elements known in other therapeutic approaches, aiming at an increase in the individual's awareness of their feelings and emotional needs, applied both in adolescent and adult groups of patients. Since the symptoms of eating disorders observed in adolescents are strongly connected with family systems it seems reasonable to use treatment techniques that rigorously address the unmet needs and rejected emotions of the individual.

Conclusions

Based on the data published so far it might be hypothesized that the techniques characteristic for Schema Therapy (e.g. imagery rescripting, chairwork, limited reparenting) could be eligible for use with adolescent patients with anorexia nervosa.They address unmet needs, rejected emotions, and early maladaptive schemas that are very frequent in patients with AN. Since the analysis presented provides only hypotheses and the discussion of theoretical aspects, empirical research in this area is needed.

Functions of disordered eating behaviors: a qualitative analysis of the lived experience and clinician perspectives

BACKGROUND

One method to improve treatment outcomes for individuals with eating disorders (EDs) may be understanding and targeting individuals' motives for engaging in DE behaviors-or the functions of DE behaviors. The goal of this study was to investigate and categorize the various functions of DE behaviors from the perspectives of adults who engage in DE behaviors and clinicians who treat EDs.

METHODS

Individuals who engage in DE behaviors (n = 16) and clinicians who treat EDs (n = 14) were interviewed, and a thematic analysis was conducted to determine key functions of DE behaviors.

RESULTS

Four main functions of DE behaviors were identified by the authors: (1) alleviating shape, weight, and eating concerns; (2) regulating emotions; (3) regulating one's self-concept; and (4) regulating interpersonal relationships/communicating with others.

CONCLUSIONS

Differences in participant responses, particularly regarding the relevance of alleviating shape and weight concerns as an DE behavior function, highlight the importance of individualized conceptualizations of DE behavior functions for any given client.

Difficulties with positive emotion regulation in anorexia nervosa

Individuals with anorexia nervosa (AN) have well-documented difficulties regulating negative emotions, but less is known about positive emotion regulation in this population. To address this gap, we compared responses on the Difficulties in Emotion Regulation Scale-Positive questionnaire and the traditional DERS questionnaire (measuring negative affect dysregulation) between females with AN (n = 30) and demographically-matched controls without an eating disorder history (NC; n = 30) and examined relations between positive emotion regulation and clinical symptoms. Results indicated that individuals with AN demonstrated greater difficulty regulating negative (p < 0.001, d = 2.75) and positive (p < 0.001, d = 1.08) emotions compared to NC participants. Specifically, the AN group reported heightened positive emotion nonacceptance (p = 0.004, d = 0.78) and impulsivity (p = 0.003, d = 0.81). Greater positive emotion nonacceptance was associated with higher anxiety (p = 0.015) and depression (p = 0.022) among individuals with AN. Unexpectedly, more positive emotion impulsivity was associated with less restrictive eating in AN (p < 0.001). Findings were largely maintained even after controlling for negative emotion dysregulation and psychotropic medication use. The results suggest that reducing shame related to positive emotions could improve mood in AN; alternatively, relinquishing control when experiencing positive emotion could reduce restriction. More research is warranted on positive emotion regulation as a treatment target for AN.

Practical Considerations for Using the Eating Disorder Examination Interview with Adolescents

Approximately 35 years after its initial publication, the Eating Disorder Examination (EDE) remains one of the most widely used semi-structured interviews for assessing eating disorder diagnoses and symptomatology. Although the interview provides certain advantages over other common measurement approaches (ie, questionnaires), there are particular considerations regarding the EDE that warrant attention, including in its use with adolescents. The aims of this paper are therefore to: 1) provide a brief overview of the interview itself, as well as a description of its origin and underlying conceptual framework; 2) describe relevant factors for administering the interview with adolescents; 3) review potential limitations regarding use of the EDE with adolescents; 4) address considerations for using the EDE with pertinent subpopulations of adolescents who may experience distinct eating disorder symptoms and/or risk factors; and 5) discuss the integration of self-report questionnaires with the EDE. Advantages of using the EDE include the ability for interviewers to clarify complex concepts and mitigate inattentive responding, enhanced orientation to the interview timeframe to improve recall, increased diagnostic accuracy compared to questionnaires, and accounting for potentially salient external factors (eg, food/eating rules imposed by a parent/guardian). Limitations include more extensive training requirements, greater assessment burden, variable psychometric performance across subgroups, lack of items evaluating muscularity-oriented symptoms and avoidant/restrictive food intake disorder diagnostic criteria, and lack of explicit consideration for salient risk factors other than weight and shape concerns (eg, food insecurity).

Learned industriousness as a translational mechanism in anorexia nervosa

It remains unexplained why some behaviours persist despite being non-hedonic and ostensibly aversive. This phenomenon is especially baffling when such behaviours are taken to excess in the form of psychopathology. Anorexia nervosa is one psychiatric disorder in which effortful behaviours that most people find unpleasant (suchas restrictive eating) are persistently performed. We propose thatthe social psychology theory of learned industriousness providesa novel mechanistic account for such phenomena. This theoryposits that high-effort behaviour can be conditioned to acquire secondary reinforcing properties through repeated pairing with reward. Accordingly, effort sensations become less aversive andmore appetitive, increasing willingness to engage in effortful behaviour. In this Perspective, we review pre-clinical behaviouraland biological data that support learned industriousness, contrast learned industriousness with other models of non-hedonic persistence (such as habit learning), highlight evidence that supports learned industriousness in individuals with anorexia nervosa and consider implications of the model, including translation to other psychiatric presentations.

A Functional Approach to the Assessment of Non-Suicidal Self-Injury on YouTube

This research explores representations of non-suicidal self-injury (NSSI) on social media. The current study aims to examine the applicability of a functional model of NSSI to videos posted on YouTube by analyzing the 100 most viewed YouTube videos relating to NSSI at a point in time in 2018. Motivations for continued engagement in NSSI were examined for each content creator who posted one of the top 100 most viewed videos relating to NSSI. Categorizations of a content creator's motivation were based on Nock and Prinstein (2004) four-function model (FFM) of NSSI, in which the motivations, or functions, of NSSI are categorized by two dichotomous factors: (a) positive (i.e., involves the addition of a favorable stimulus) or negative (i.e., involves the removal of an aversive stimulus) and (b) automatic (i.e., intrapersonal) or social (i.e., interpersonal). Uploaders most endorsed automatic negative reinforcement (50%), followed by automatic positive (26%), social positive (3%), and social negative (3%). Considering the growing number of children and adolescents with near constant access to internet and social media, there may be implications for further development of safety measures for social media platforms. The results of this study may be valuable for parents, health care professionals, and educators, who should be aware of available social media content relating to NSSI and consider implementing additional media-literacy and media-safety education in school curriculums and programming for children and adolescents. Furthermore, health care professional should be aware that misconceptions of NSSI may have an impact on patients' willingness to seek treatment, or the attitude with which treatment is sought.

The association of perfectionism, health-focused self-concept, and erroneous beliefs with orthorexia nervosa symptoms: A moderated mediation model

OBJECTIVE

Orthorexia nervosa (ON) is a putative eating disorder linked to perfectionism among people who eat healthily (or who want to eat healthily). However, little is known about the process by which perfectionism fosters ON symptoms. Like the Transdiagnostic Cognitive-Behavioral Theory of Eating Disorders, we hypothesized that perfectionism among people who eat healthily (or who want to eat healthily) fosters ON symptoms indirectly by cultivating a health-focused self-concept (i.e., placing overriding importance on health for self-definition and self-worth). We also hypothesized that a health-focused self-concept would be associated with ON symptoms among people who have erroneous beliefs about the safety and efficacy of maladaptive healthy eating strategies.

METHOD

To test this moderated mediation model, a sample of people following a healthy eating diet plan and/or who believe they are leading a healthy eating lifestyle (N = 456) were recruited from Amazon's Mechanical Turk and completed measures that assessed perfectionism, health-focused self-concept, ON symptoms, and erroneous beliefs about the safety and efficacy of maladaptive healthy eating strategies. They also completed a measure of appearance-focused self-concept.

RESULTS

Health-focused and appearance-focused self-concepts were empirically distinct. As expected, perfectionism was indirectly and positively associated with ON symptoms via a health-focused self-concept. Importantly, the indirect association was only observed among participants high, but not low, in erroneous beliefs.

DISCUSSION

The findings support the role of perfectionism in ON. The findings also advance knowledge by identifying a health-focused self-concept and erroneous beliefs as potential factors in the etiology and maintenance of ON.

Interpersonal, affective and compulsive features of driven exercise in anorexia nervosa

BACKGROUND

This preregistered (https://osf.io/g9ajb) analysis sought to integrate the current literature on trait compulsivity into maintenance models of driven exercise in anorexia nervosa (AN). We tested whether compulsivity increases the likelihood of driven exercise via interpersonal and affect-regulatory pathways.

METHODS

We used multilevel structural equation modeling to test the hypothesis that trait compulsivity predicts a stronger within-person link between affect-regulatory difficulties or interpersonal sensitivity and driven exercise in female adolescents and adults with AN. We used data from five assessments across inpatient treatment and 6-months follow-up of 207 adult and adolescent patients with AN (1035 datapoints).

RESULTS

In line with our hypotheses, patients who generally experienced more affect-regulatory difficulties or stronger interpersonal sensitivity tended to engage in driven exercise more strongly. Moreover, high levels of trait compulsivity amplified the effect of interpersonal sensitivity on driven exercise across time. Contrary to our hypotheses, the link between affect regulation and driven exercise was not moderated by compulsivity. Similar effects on general eating disorder psychopathology were found, but no cross-level moderation effect of compulsivity.

LIMITATIONS

Due to sample size, potential AN subtype-dependent effects were not analyzed.

CONCLUSION

Our results suggest that driven exercise coincides with self-reported experiences of interpersonal sensitivity and that this link varies as a function of compulsivity such that the within-person coupling is stronger among those scoring high on compulsivity. To derive clinically useful functional models of driven exercise, future studies might use intensive longitudinal data to investigate its momentary associations with affect and interpersonal sensitivity in the context of compulsive traits.