Cortical thickness, local gyrification index and fractal dimensionality in people with acute and recovered Anorexia Nervosa and in people with Bulimia Nervosa.

Eating disorders (EDs) have a possible neurodevelopmental pathogenesis. Our study aim was to assess regional cortical thickness (CT), local gyrification index (lGI) and fractal dimensionality (FD), as specific markers of cortical neurodevelopment in ED females. Twenty-two women with acute anorexia nervosa (acuAN), 10 with recovered anorexia nervosa (recAN), 24 with bulimia nervosa (BN) and 35 female healthy controls (HC) underwent a 3T MRI scan. All data were processed by FreeSurfer. Compared to recAN group women with acuAN showed a lower CT in multiple areas, while compared to HC they showed lower CT in temporal regions. BN group showed higher CT values in temporal and paracentral areas compared to HC. In multiple cortical areas, AcuAN group showed greater values of lGI compared to recAN group and lower values of lGI compared to HC. The BN group showed lower lGI in left medial orbitofrontal cortex compared to HC. No significant differences were found in FD among the groups. Present results provide evidence of CT and lGI alterations in patients with AN and, for the first time, in those with BN. Although these alterations could be state-dependent phenomena, they may underlie psychopathological aspects of EDs.

The influence of oxytocin on risk-taking in the balloon analogue risk task among women with bulimia nervosa and binge eating disorder.

Previous theoretical models of bulimia nervosa (BN) and binge eating disorder (BED) have implicated cross-domain risk-taking behaviour as a significant maintenance factor in both disorders. The present study aimed to test this hypothesis by administering the Balloon Analogue Risk Task (BART) to 25 women with BN or BED and 27 healthy comparison women without a history of an eating disorder. Furthermore, we tested the effect of a divided dose of 64 IU of oxytocin on risk-taking behaviour in the BART. Contrary to our hypothesis, women with BN or BED did not exhibit baseline differences in performance on the BART in the placebo condition (t = 1.42, df = 50, P = 0.161, d = 0.39). Oxytocin did not have a main effect on performance in the BART (F = 0.01, df = 1, P = .907, η2partial  < 0.001); however, there was an interaction, such that participants in the BN/BED participant group, compared to the healthy comparison group, demonstrated safer behaviour on the BART in the oxytocin condition, but not in the placebo condition (F = 4.29, df = 1, P = 0.044, η2partial  = 0.082). These findings cast doubt on the common assumption that individuals with BN and BED exhibit greater risk-taking behaviour in all domains and add to the evidence that oxytocin plays a functional role in modulating behaviours that entail trade-offs between reward approach and risk in humans. We recommend that future dose-response studies investigate the effect of oxytocin on reward approach behaviour further in women with recurrent binge eating behaviour, as well as the clinical significance of this effect.

Role of eating disorders-related polymorphisms in obesity pathophysiology.

Human biological system provides innumerable neuroendocrine inputs for food intake control, with effects on appetite's modulation and the satiety signs. Its regulation is very complex, engaging several molecular interactions with many tissues, hormones, and neural circuits. Thus, signaling molecules that control food intake are critical for normal energy homeostasis and a deregulation of these pathways can lead to eating disorders and obesity. In line of this, genetic factors have a significantly influence of the regulation of neural circuits controlling the appetite and satiety pathways, as well as the regulation of brain reward systems. Single Nucleotide Polymorphisms (SNPs) in genes related to hypothalamic appetite and satiety mechanisms, further in multiple neurotransmitter systems may contribute to the development of major Eating Disorders (EDs) related to obesity, among them Binge Eating Disorder (BED) and Bulimia Nervosa (BN), which are discussed in this review.

Subcortical Shape Abnormalities in Bulimia Nervosa.

BACKGROUND: Bulimia nervosa (BN) is associated with functional abnormalities in frontostriatal and frontolimbic circuits. Although structural alterations in the frontal portions of these circuits have been observed, this is the first study of subcortical surface morphometry and the largest study of subcortical volume in BN. METHODS: Anatomical magnetic resonance scans were acquired from 62 female participants with full and subthreshold BN (mean age ± SD, 18.7 ± 4.0 years) and 65 group-matched healthy control participants (mean age ± SD, 19.3 ± 5.7 years). General linear models were used to compare groups and assess the significance of group-by-age interactions on the shape and total volume of 15 subcortical structures (p < .05, familywise error corrected). Associations with illness severity and duration were assessed in the BN group. RESULTS: Subcortical volumes did not differ across groups, but vertexwise analyses revealed inward shape deformations on the anterior surface of the pallidum in BN relative to control participants that were associated with binge-eating frequency and illness duration. Inward deformations on the ventrolateral thalamus and dorsal amygdala were more pronounced with advancing age in the BN group, and inward deformations on the caudate, putamen, and amygdala were associated with self-induced vomiting frequency. CONCLUSIONS: Our findings point to localized deformations on the surface of subcortical structures in areas that comprise both reward and cognitive control circuits. These deformations were more pronounced among older BN participants and among those with the most severe symptoms. Such precise localization of alterations in subcortical morphometry may ultimately aid in efforts to identify markers of risk and BN persistence.

Psychiatric and medical correlates of DSM-5 eating disorders in a nationally representative sample of adults in the United States.

OBJECTIVE: To examine psychiatric and somatic correlates of DSM-5 eating disorders (EDs)-anorexia nervosa (AN), bulimia nervosa (BN), and binge-eating disorder (BED)-in a nationally representative sample of adults in the United States. METHOD: A national sample of 36,309 adult participants in the national epidemiologic survey on alcohol and related conditions III (NESARC-III) completed structured diagnostic interviews (AUDADIS-5) to determine psychiatric disorders, including EDs, and reported 12-month diagnosis of chronic somatic conditions. Prevalence of lifetime psychiatric disorders and somatic conditions were calculated across the AN, BN, and BED groups and a fourth group without specific ED; multiple logistic regression models compared the likelihood of psychiatric/somatic conditions with each specific ED relative to the no-specific ED group. RESULTS: All three EDs were associated significantly with lifetime mood disorders, anxiety disorders, alcohol and drug use disorders, and personality disorders. In all three EDs, major depressive disorder was the most prevalent, followed by alcohol use disorder. AN was associated significantly with fibromyalgia, cancer, anemia, and osteoporosis, and BED with diabetes, hypertension, high cholesterol, and triglycerides. BN was not associated significantly with any somatic conditions. CONCLUSIONS: This study examined lifetime psychiatric and somatic correlates of DSM-5 AN, BN, and BED in a large representative sample of U.S. adults. Our findings on significant associations with other psychiatric disorders and with current chronic somatic conditions indicate the serious burdens of EDs. Our findings suggest important differences across specific EDs and indicate some similarities and differences to previous smaller studies based on earlier diagnostic criteria.

Approach bias modification training in bulimia nervosa and binge-eating disorder: A pilot randomized controlled trial.

OBJECTIVE: Bulimia nervosa (BN) and binge-eating disorder (BED) are associated with poorly controlled approach behavior toward food resulting in binge eating. Approach bias modification (ABM) may reduce these automatic action tendencies (i.e., approach bias) toward food and may thus decrease binge eating and related symptoms. METHOD: A total of 56 patients with BN/BED participated in this double-blind, randomized controlled trial (RCT) comparing real and sham ABM. The real ABM condition adopted an implicit learning paradigm in which participants were trained to show avoidance behavior in response to food cues. Participants in the sham condition used a similar task but were not trained to avoid food cues. Both conditions comprised 10 training sessions within 4 weeks. RESULTS: Participants in both groups experienced significant reductions in binge eating, eating disorder symptoms, trait food craving, and food cue reactivity. Real ABM tended to result in greater reductions in eating disorder symptoms than sham ABM. Food intake, approach bias, and attention bias toward food did not change. DISCUSSION: This is the first RCT on ABM in eating disorders. The findings provide limited support for the efficacy of ABM in BN/BED and pose questions regarding its active ingredients and its usefulness as a stand-alone treatment for eating disorders.

The QTc interval and risk of cardiac events in bulimia nervosa: A long-term follow-up study.

OBJECTIVE: An association between bulimia nervosa (BN) and prolonged corrected QT interval (QTc) in the electrocardiogram has been suggested, but results of previous studies are conflicting, and the risk of cardiac events in patients with BN has yet to be investigated. METHOD: We estimated mean QTc interval and relative risk of borderline (QTc >440 ms) and prolonged QTc (QTc >460 ms) between adult women with BN (N = 531) and healthy controls (N = 123). In follow-up analyses, we investigated the risk of a primary endpoint (syncope, ventricular tachycardia, and cardiac arrest) and all-cause mortality in patients with BN (N = 702) compared with a population-based cohort derived from the Danish Civil Register (N = 7,020). RESULTS: Mean QTc did not differ between patients with BN and controls. Relative risk of borderline prolonged QTc was 2.3 (p = 0.28). The number of patients and controls with prolonged QTc was small, and the risk did not differ between patients with BN and controls. Median follow-up was 10.6 years. Although there appeared to be increased risks after 5 years of follow-up, long-term risks of the primary endpoint (Hazard ratio [HR] = 1.4, p = 0.37) and all-cause mortality (HR = 1.7, p = .28), respectively, were not increased in patients with BN compared to a population-based cohort. DISCUSSION: Mean QTc did not differ between patients with BN and healthy controls, and the risk of prolonged QTc was not increased in patients with BN. There was no difference in the long-term risk of cardiac events, and long-term all-cause mortality did not differ significantly between patients with BN and a population-based cohort.

Are we overdosing treatment? Secondary findings from a study following women with bulimia nervosa after inpatient treatment.

OBJECTIVE: Provision of eating disorder (ED) treatment in practice is often guided by national health service structures rather than evidence-based treatment recommendations. Especially for more severely or chronically ill patients, clinicians seem to advocate a "the more the better" strategy of treatment provision. Exploring the dose-response relationship in ED treatment may shed light on both beneficial and detrimental effects of prolonged treatment provision. METHOD: We utilized data from 64 women from the treatment-as-usual (TAU) group of a randomized controlled trial on Internet-based aftercare for women with bulimia nervosa who had received inpatient treatment. We examined the relationship between treatment duration and dose and (1) baseline patient characteristics and (2) treatment outcomes (abstinence from binge eating and compensatory behaviors, frequency of binge eating and vomiting, thin ideal internalization, and general psychopathology) at 18-month follow up. RESULTS: On average, the women in our study were hospitalized for 9 weeks and most received high doses of subsequent outpatient psychotherapy (median: 45 sessions). The severity of symptoms that a patient experienced at hospital admission or discharge was largely unrelated to the amount of outpatient treatment she subsequently received. Longer inpatient treatments or higher doses of subsequent outpatient treatment did not result in more favorable outcomes. DISCUSSION: Our findings suggest that, instead of providing costly long treatment without evidenced benefit to patients, there is a need for further exploration of and discussion about the risks and benefits of providing high doses of treatment for both individuals and the health care system.

Just-in-time adaptive interventions: A novel approach for enhancing skill utilization and acquisition in cognitive behavioral therapy for eating disorders.

OBJECTIVE: The most widely researched treatment for bulimia nervosa (BN) and binge-eating disorder (BED) is cognitive behavioral therapy (CBT), a present-focused, active, skill-oriented treatment. However, despite the success of CBT, many patients fail to achieve sufficient rates of skill utilization (i.e., the frequency with which a patient practices or uses therapeutic skills) or adequate skill acquisition (i.e., the ability to successfully perform a skill learned in treatment) by the end of treatment and outcomes suffer as a result. One method for improving skill acquisition and utilization in patients with BN or BED could be the augmentation of in-person treatment with just-in-time adaptive interventions (JITAIs), which use smartphone technology to deliver real-time interventions during app-identified moments of need. The current article discusses how novel JITAI systems that utilize machine learning or other predictive algorithms could be used to detect momentary risk for eating disordered behavior and provide tailored interventions to enhance outcomes. We will consider technologies that may help reduce patient burden and suggest avenues for future research on developing acceptable and effective JITAIs that can be used as an adjunct to CBT protocols.

Altered cortical thickness and attentional deficits in adolescent girls and women with bulimia nervosa.

BACKGROUND: Frontostriatal and frontoparietal abnormalities likely contribute to deficits in control and attentional processes in individuals with bulimia nervosa and to the persistence of dysregulated eating across development. This study assessed these processes and cortical thickness in a large sample of adolescent girls and women with bulimia nervosa compared with healthy controls. METHODS: We collected anatomical MRI data from adolescent girls and women (ages 12-38 yr) with full or subthreshold bulimia nervosa and age-matched healthy controls who also completed the Conners Continuous Performance Test-II (CPT-II). Groups were compared on task performance and cortical thickness. Mediation analyses explored associations among cortical thickness, CPT-II variables, bulimia nervosa symptoms and age. RESULTS: We included 60 girls and women with bulimia nervosa and 54 controls in the analyses. Compared with healthy participants, those with bulimia nervosa showed increased impulsivity and inattention on the CPT-II, along with reduced thickness of the right pars triangularis, right superior parietal and left dorsal posterior cingulate cortices. In the bulimia nervosa group, exploratory analyses revealed that binge eating frequency correlated inversely with cortical thickness of frontoparietal and insular regions and that reduced frontoparietal thickness mediated the association between age and increased symptom severity and inattention. Binge eating frequency also mediated the association between age and lower prefrontal cortical thickness. LIMITATIONS: These findings are applicable to only girls and women with bulimia nervosa, and our cross-sectional design precludes understanding of whether cortical thickness alterations precede or result from bulimia nervosa symptoms. CONCLUSION: Structural abnormalities in the frontoparietal and posterior cingulate regions comprising circuits that support control and attentional processes should be investigated as potential contributors to the maintenance of bulimia nervosa and useful targets for novel interventions.

Oral mucosal lesions in Anorexia Nervosa, Bulimia Nervosa and EDNOS.

OBJECTIVES: The aim of this study is to describe oral lesions in patients with eating disorders (ED), including Anorexia Nervosa (AN), Bulimia Nervosa (BN) and eating disorders not otherwise specified (EDNOS). MATERIAL AND METHODS: A prospective case-control study was carried out from April 2003 to May 2004. Inclusion criteria for the study group were individuals with a diagnosis of ED; age and sex-matched individuals without ED were included as controls. Clinical data regarding ED, medical complications and oral examination were performed by previously calibrated professionals. RESULTS: Study group (n = 65) presented 46 cases of BN (71%), 13 of EDNOS (20%) and 6 of AN (9%); also, 94% (n = 61) showed oral lesions. The most common were: labial erythema, exfoliative cheilitis, orange-yellow palate, hemorrhagic lesions, lip-cheek biting and non-specific oral atrophies. Only two patients of the study group had dental erosions, and no case of major salivary gland swelling was found. CONCLUSIONS: ED display a wide array of oral mucosal lesions that can be regarded as their early manifestations. The dentist could be the first professional to detect symptoms of eating disorders, potentially improving early detection and treatment of ED.

Reduced Inferior and Orbital Frontal Thickness in Adolescent Bulimia Nervosa Persists Over Two-Year Follow-Up.

OBJECTIVE: Cross-sectional data suggest functional and anatomical disturbances in inferior and orbital frontal regions in bulimia nervosa (BN). Using longitudinal data, we investigated whether reduced cortical thickness (CT) in these regions arises early and persists over adolescence in BN, independent of symptom remission, and whether CT reductions are markers of BN symptoms. METHOD: A total of 33 adolescent females with BN symptoms (BN or other specified feeding or eating disorder) and 28 healthy adolescents participated in this study. Anatomical magnetic resonance imaging and clinical data were acquired at 3 time points within 2-year intervals over adolescence, with 31% average attrition between assessments. Using a region-of-interest approach, we assessed group differences in CT at baseline and over time, and tested whether between- and within-subject variations in CT were associated with the frequency of BN symptoms. RESULTS: Reduced CT in the right inferior frontal gyrus persisted over adolescence in BN compared to healthy adolescents, even in those who achieved full or partial remission. Within the BN group, between-subject variations in CT in the inferior and orbital frontal regions were inversely associated with specific BN symptoms, suggesting, on average over time, greater CT reductions in individuals with more frequent BN symptoms. CONCLUSION: Reduced CT in inferior frontal regions may contribute to illness persistence into adulthood. Reductions in the thickness of the inferior and orbital frontal regions may be markers of specific BN symptoms. Because our sample size precluded correcting for multiple comparisons, these findings should be replicated in a larger sample. Future study of functional changes in associated fronto-striatal circuits could identify potential circuit-based intervention targets.

Oral health considerations in anorexia and bulimia nervosa. 1. Symptomatology and diagnosis.

Eating disorders have captured the attention of medical and dental professionals as well as the public for decades and continue to raise concern today. The literature devoted to anorexia and bulimia highlights myriad psychological, systemic, and dental health complications. Dental practitioners are in a unique position to discover early manifestations of these disorders. The present article reviews anorexia and bulimia, summarizing telltale behavioral traits, systemic manifestations, and dental features to facilitate recognition and enable accurate diagnosis.

Attitudes toward orthorexia nervosa relative to DSM-5 eating disorders.

OBJECTIVE: A pattern of disordered eating involving a pathological fixation with healthy food consumption, labeled orthorexia nervosa (ON), has recently generated attention; however, research has not yet investigated perceptions of ON-related behaviors. This study examined potential stigmatization of ON, compared with DSM-5 ED diagnoses. METHOD: Participants (N = 505) were randomly assigned to read a vignette depicting a woman with anorexia nervosa (AN), bulimia nervosa (BN), binge-eating disorder (BED), or ON. They then answered questions about the individual depicted in the vignette. A series of MANOVAs investigated whether opinions and beliefs about the person depicted varied as a function of the disorder described in the vignette. RESULTS: Individuals with ON were perceived as less likely to "improve with treatment" than individuals with BN, and less likely to "pull themselves together," than individuals with BED. Individuals with ON and AN were viewed as "hard[er] to talk to" and more of a "danger to others" compared with individuals with BED. ON was viewed as less distressing, less likely to evoke sympathy, and more acceptable than the other disorders. Finally, "poor living choices" were perceived as contributing more substantially to ON. Participants' attributions of various personality characteristics did not differ based on ED diagnosis. DISCUSSION: Results suggest that ON is viewed as less severe, more desirable, and more often the result of personal life choices. However, findings also imply that ON is associated with stigma, similar to DSM-5 EDs. These negative attitudes might reinforce ON behaviors, and limit awareness of their potential complications.

Predicting onset and maintenance of men's eating disorders / Predictores de inicio y desarrollo de patología alimentaria en hombres

Background/Objective: Eating disorders (EDs) represent serious yet understudied mental health issues, particularly amongst young adult men attending colleges, who are at the average age of onset. Despite this and recent evidence that in young adult men the core ED symptoms are prevalent and remain relatively stable over the college period, little is known about factors associated with both the onset and maintenance of diagnosable EDs in this population. This work sought to address these research gaps. Method: Logistic regression analyses were conducted using data from an on-going longitudinal study of eating and mental health issues to examine the influence of theoretically relevant factors in predicting the onset and maintenance of men's (DSM-5) EDs at 4-year follow-up (N=2,507). Results: Body dissatisfaction, self-objectification, appearance-ideal internalization, dieting, and negative affectivity were all predictors of ED onset and maintenance. Self-objectification was the largest contributor to both ED onset and maintenance. Conclusions: The findings highlight potentially similar psychosocial foci for prevention and treatment efforts. Implications for improving existing preventive and treatment approaches are discussed (AU)

Antecedentes/Objetivo: Los trastornos de la conducta alimentaria (TCAs) representan graves, aunque poco estudiados, problemas de salud mental en las universidades, especialmente en hombres jóvenes, quienes se encuentran en la edad media de inicio. A pesar de la evidencia de que en hombres adultos jóvenes los principales síntomas de TCA son frecuentes y se mantienen relativamente estables durante el período universitario, poco se sabe sobre los factores asociados con la aparición y el mantenimiento de los TCAs en esta población. Este trabajo trata de abordar estas lagunas de investigación. Método: Se realizaron análisis de regresión logística utilizando datos de un estudio longitudinal en curso sobre alimentación y salud mental para examinar la influencia de factores teóricamente relevantes para predecir la aparición y el mantenimiento de los TCAs (DSM-5) en hombres durante 4 años de seguimiento (N=2.507). Resultados: La insatisfacción corporal, la auto-objetivación, la internalización de la apariencia ideal, las dietas, y la afectividad negativa fueron predictores de inicio y mantenimiento de TCA. La auto-objetivación fue el mayor contribuyente a la aparición y mantenimiento de TCA. Conclusiones: Los resultados destacan focos similares para su prevención y tratamiento. Se discuten las implicaciones para mejorar los enfoques preventivos y de tratamiento existentes (AU)

Altered White Matter Microstructure in Adolescents and Adults with Bulimia Nervosa.

Previous data suggest structural and functional deficits in frontal control circuits in adolescents and adults with bulimia nervosa (BN), but less is known about the microstructure of white matter in these circuits early in the course of the disorder. Diffusion tensor imaging (DTI) data were acquired from 28 female adolescents and adults with BN and 28 age- and BMI-matched healthy female participants. Tract-based spatial statistics (TBSS) was used to detect group differences in white matter microstructure and explore the differential effects of age on white matter microstructure across groups. Significant reductions in fractional anisotropy (FA) were detected in the BN compared with healthy control group in multiple tracts including forceps minor and major, superior longitudinal, inferior fronto-occipital, and uncinate fasciculi, anterior thalamic radiation, cingulum, and corticospinal tract. FA reductions in forceps and frontotemporal tracts correlated inversely with symptom severity and Stroop interference in the BN group. These findings suggest that white matter microstructure is abnormal in BN in tracts extending through frontal and temporoparietal cortices, especially in those with the most severe symptoms. Age-related differences in both FA and RD in these tracts in BN compared with healthy individuals may represent an abnormal trajectory of white matter development that contributes to the persistence of functional impairments in self-regulation in BN.

Biomarkers of Eating Disorders Using Support Vector Machine Analysis of Structural Neuroimaging Data: Preliminary Results.

Presently, there are no valid biomarkers to identify individuals with eating disorders (ED). The aim of this work was to assess the feasibility of a machine learning method for extracting reliable neuroimaging features allowing individual categorization of patients with ED. Support Vector Machine (SVM) technique, combined with a pattern recognition method, was employed utilizing structural magnetic resonance images. Seventeen females with ED (six with diagnosis of anorexia nervosa and 11 with bulimia nervosa) were compared against 17 body mass index-matched healthy controls (HC). Machine learning allowed individual diagnosis of ED versus HC with an Accuracy ≥ 0.80. Voxel-based pattern recognition analysis demonstrated that voxels influencing the classification Accuracy involved the occipital cortex, the posterior cerebellar lobule, precuneus, sensorimotor/premotor cortices, and the medial prefrontal cortex, all critical regions known to be strongly involved in the pathophysiological mechanisms of ED. Although these findings should be considered preliminary given the small size investigated, SVM analysis highlights the role of well-known brain regions as possible biomarkers to distinguish ED from HC at an individual level, thus encouraging the translational implementation of this new multivariate approach in the clinical practice.

Brain correlates of alexithymia in eating disorders: A voxel-based morphometry study.

AIMS: Alexithymia is a personality trait that consists of difficulty in identifying and acknowledging one's own and others' feelings. Recent studies reported that alexithymia is present in both anorexia (AN) and bulimia nervosa (BN). Brain morphological studies on healthy subjects showed that alexithymia correlates with several brain regions involved in emotions processing. The aim of this study was to investigate the anatomical correlates of alexithymia in AN and BN. METHODS: We performed a voxel-based morphometry study on 21 patients with AN and 18 with BN. Seventeen healthy subjects were used as a control group. Alexithymia, depression and anxiety were assessed with self-administered questionnaires and correlated to gray matter (GM) density in each group. RESULTS: In BN, alexithymia was correlated with the GM of the parietal lobe, in particular of the right angular gyrus. The correlation was predominantly linked with Difficulty Describing Feelings. In AN, we did not find correlations between GM and alexithymia. CONCLUSIONS: In BN, our results support the hypothesis that this trait may represent a relevant pathogenic or maintenance factor that contributes to relational difficulties, present in this pathology. In AN, the lack of correlation between GM volume and alexithymia may be influenced by atrophy in several brain regions that in turn can be, as previously reported, a consequence of caloric restriction. Also, the nature of alexithymia may be different from that of BN and controls and this trait could be secondary to a psychopathologic process specific to AN.

Recent advances in neuroimaging to model eating disorder neurobiology.

The eating disorders (EDs) anorexia nervosa (AN), bulimia nervosa (BN), and binge eating disorder (BED) are severe psychiatric disorders with high mortality. There are many symptoms, such as food restriction, episodic binge eating, purging, or excessive exercise that are either overlapping or lie on opposite ends of a scale or spectrum across those disorders. Identifying how specific ED behaviors are linked to particular neurobiological mechanisms could help better categorize ED subgroups and develop specific treatments. This review provides support from recent brain imaging research that brain structure and function measures can be linked to disorder-specific biological or behavioral variables, which may help distinguish ED subgroups, or find commonalities between them. Brain structure and function may therefore be suitable research targets to further study the relationship between dimensions of behavior and brain function relevant to EDs and beyond the categorical AN, BN, and BED distinctions.