Binge eating disorder: treatment outcome over a 6-year course

Overlap of eating disorders and neurodivergence: the role of inhibitory control

BACKGROUND

Difficulties with inhibitory control have been identified in eating disorders (EDs) and neurodevelopmental disorders (NDs; including attention deficit hyperactivity disorder (ADHD) and autism spectrum disorder), and there appear to be parallels between the expression of these impairments. It is theorised that impairments in inhibitory control within NDs may represent a unique vulnerability for eating disorders (EDs), and this same mechanism may contribute to poorer treatment outcomes. This review seeks to determine the state of the literature concerning the role of inhibitory control in the overlap of EDs and neurodivergence.

METHOD

A scoping review was conducted to summarise extant research, and to identify gaps in the existing knowledge base. Scopus, Medline, PsycInfo, Embase, and ProQuest were systematically searched. Studies were included if the study measured traits of ADHD or autism, and symptoms of ED, and required participants to complete a performance task measure of inhibitory control. Where studies included a cohort with both an ND and ED, these results had to be reported separately from cohorts with a singular diagnosis. Studies were required to be published in English, within the last 10 years.

RESULTS

No studies explored the relationship between autism and EDs using behavioural measures of inhibitory control. Four studies exploring the relationship between ADHD and EDs using behavioural measures of inhibitory control met selection criteria. These studies showed a multifaceted relationship between these conditions, with differences emerging between domains of inhibitory control. ADHD symptoms predicted poorer performance on measures of response inhibition in a non-clinical sample; this was not replicated in clinical samples, nor was there a significant association with EDs. Both ADHD and ED symptoms are associated with poor performance on attentional control measures; where these diagnoses were combined, performance was worse than for those with a singular diagnosis of ADHD. This was not replicated when compared to those with only ED diagnoses.

CONCLUSION

Impairments in attentional control may represent a unique vulnerability for the development of an ED and contribute to poor treatment outcomes. Further research is needed to explore the role of inhibitory control in EDs, ADHD and autism, including the use of both self-report and behavioural measures to capture the domains of inhibitory control.

The natural course of binge-eating disorder: findings from a prospective, community-based study of adults

BACKGROUND

Epidemiological data offer conflicting views of the natural course of binge-eating disorder (BED), with large retrospective studies suggesting a protracted course and small prospective studies suggesting a briefer duration. We thus examined changes in BED diagnostic status in a prospective, community-based study that was larger and more representative with respect to sex, age of onset, and body mass index (BMI) than prior multi-year prospective studies.

METHODS

Probands and relatives with current DSM-IV BED (n = 156) from a family study of BED ('baseline') were selected for follow-up at 2.5 and 5 years. Probands were required to have BMI > 25 (women) or >27 (men). Diagnostic interviews and questionnaires were administered at all timepoints.

RESULTS

Of participants with follow-up data (n = 137), 78.1% were female, and 11.7% and 88.3% reported identifying as Black and White, respectively. At baseline, their mean age was 47.2 years, and mean BMI was 36.1. At 2.5 (and 5) years, 61.3% (45.7%), 23.4% (32.6%), and 15.3% (21.7%) of assessed participants exhibited full, sub-threshold, and no BED, respectively. No participants displayed anorexia or bulimia nervosa at follow-up timepoints. Median time to remission (i.e. no BED) exceeded 60 months, and median time to relapse (i.e. sub-threshold or full BED) after remission was 30 months. Two classes of machine learning methods did not consistently outperform random guessing at predicting time to remission from baseline demographic and clinical variables.

CONCLUSIONS

Among community-based adults with higher BMI, BED improves with time, but full remission often takes many years, and relapse is common.

Meta-analysis on the long-term effectiveness of psychological and medical treatments for binge-eating disorder

OBJECTIVE

Long-term effectiveness is a critical aspect of the clinical utility of a treatment; however, a meta-analytic evaluation of psychological and medical treatments for binge-eating disorder (BED), including weight loss treatments, is outstanding. This meta-analysis sought to provide a comprehensive evaluation of the long-term effectiveness in diverse treatments for BED regarding a range of clinically relevant outcomes.

METHOD

Based on a systematic search up to February 2018, 114 published and unpublished randomized-controlled (RCTs), nonrandomized, and uncontrolled treatment studies, totaling 8,862 individuals with BED (DSM-IV, DSM-5), were identified and analyzed using within-group random-effect modeling.

RESULTS

Effectiveness (regarding binge-eating episodes and abstinence, eating disorder and general psychopathology) up to 12 months following treatment was demonstrated for psychotherapy, structured self-help treatment, and combined treatment, while the results regarding body weight reduction were inconsistent. These results were confirmed in sensitivity analyses with RCTs on the most common treatments-cognitive-behavioral therapy and self-help treatment based on this approach. Follow-up intervals longer than 12 months were rarely reported, mostly supporting the long-term effectiveness of psychotherapy. Few follow-up data were available for pharmacotherapy, and behavioral and self-help weight loss treatment, while follow-up data were lacking for pharmacological and surgical weight loss treatment. Study quality varied widely.

DISCUSSION

This comprehensive meta-analysis demonstrated the medium-term effectiveness of psychotherapy, structured self-help treatment, and combined treatment for patients with BED, and supported the long-term effectiveness of psychotherapy. The results were derived from uncontrolled comparisons over time. Further long-term high quality research on psychological and medical treatments for BED is required.

The prevalence and correlates of binge eating disorder in the World Health Organization World Mental Health Surveys

BACKGROUND

Little population-based data exist outside the United States on the epidemiology of binge eating disorder (BED). Cross-national BED data are presented here and compared with bulimia nervosa (BN) data in the World Health Organization (WHO) World Mental Health Surveys.

METHODS

Community surveys with 24,124 respondents (ages 18+) across 14 mostly upper-middle and high-income countries assessed lifetime and 12-month DSM-IV mental disorders with the WHO Composite International Diagnostic Interview. Physical disorders were assessed with a chronic conditions checklist.

RESULTS

Country-specific lifetime prevalence estimates are consistently (median; interquartile range) higher for BED (1.4%; .8-1.9%) than BN (.8%; .4-1.0%). Median age of onset is in the late teens to early 20s for both disorders but slightly younger for BN. Persistence is slightly higher for BN (6.5 years; 2.2-15.4) than BED (4.3 years; 1.0-11.7). Lifetime risk of both disorders is elevated for women and recent cohorts. Retrospective reports suggest that comorbid DSM-IV disorders predict subsequent onset of BN somewhat more strongly than BED and that BN predicts subsequent comorbid disorders somewhat more strongly than does BED. Significant comorbidities with physical conditions are due almost entirely to BN and to a somewhat lesser degree BED predicting subsequent onset of these conditions. Role impairments are similar for BN and BED. Fewer than half of lifetime BN or BED cases receive treatment.

CONCLUSIONS

Binge eating disorder represents a public health problem at least equal to BN. Low treatment rates highlight the clinical importance of questioning patients about eating problems even when not included among presenting complaints.

A comprehensive meta-analysis of the risk of suicide in eating disorders

OBJECTIVE

Past meta-analyses on suicide in eating disorders included few available studies.

METHOD

PubMed/Medline search for papers including sample n ≥40 and follow-up ≥5 years: 40 studies on anorexia nervosa (AN), 16 studies on bulimia nervosa (BN), and three studies on binge eating disorder (BED) were included.

RESULTS

Of 16,342 patients with AN, 245 suicides occurred over a mean follow-up of 11.1 years (suicide rate=0.124 per 100 person-years). Standardized mortality ratio (SMR) was 31.0 (Poisson 95% CI=21.0-44.0); a clear decrease in suicide risk over time was observed in recent decades. Of 1768 patients with BN, four suicides occurred over a mean follow-up of 7.5 years (suicide rate=0.030 per 100 person-years): SMR was 7.5 (1.6-11.6). No suicide occurred among 246 patients with BED (mean follow-up=5.3 years).

CONCLUSION

AN and BN share many risk factors for suicide: the factors causing lower suicide rates per person-year in BN compared to AN should be investigated.

Diagnostic crossover and outcome predictors in eating disorders according to DSM-IV and DSM-V proposed criteria: a 6-year follow-up study

OBJECTIVE

To evaluate in a 6-year follow-up study the course of a large clinical sample of patients with eating disorders (EDs) who were treated with individual cognitive behavior therapy. The diagnostic crossover, recovery, and relapses were assessed, applying both Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) and the DSM-V proposed criteria. Patients with EDs move in and out of illness states over time, display frequent relapses, show a relevant lifetime psychiatric comorbidity, and migrate between different diagnoses.

METHOD

A total of 793 patients (including anorexia nervosa, bulimia nervosa, binge eating disorder, and EDs not otherwise specified) were evaluated on the first day of admission, at the end of treatment, 3 years after the end of treatment, and 3 years after the first follow-up. Clinical data were collected through a face-to-face interview; diagnosis was performed by means of the Structured Clinical Interview for DSM-IV and the Eating Disorder Examination Questionnaire was applied.

RESULTS

A consistent rate of relapse and crossover between the different diagnoses over time was observed. Mood disorders comorbidity has been found to be an important determinant of diagnostic instability, whereas the severity of shape concern represented a relevant outcome modifier. Using the DSM-V proposed criteria, most patients of EDs not otherwise specified were reclassified, so that the large majority of ED patients seeking treatment would be included in full-blown diagnoses.

CONCLUSIONS

Among EDs, there are different subgroups of patients displaying various courses and outcomes. The diagnostic instability involves the large majority of patients. An integration of categorical and dimensional approaches could improve the psychopathological investigation and the treatment choices.

Meta-analysis of the effectiveness of psychological and pharmacological treatments for binge eating disorder

OBJECTIVE

The aim of this study was to compute and compare mean effects of various treatments for binge eating disorder.

METHOD

A total of 38 studies with 1973 participants fulfilled the defined inclusion criteria. Effect sizes, odds ratios, and simple rates were integrated in fixed and random (mixed) effects categorical models.

RESULTS

From randomized controlled trials, psychotherapy and structured self-help, both based on cognitive behavioral interventions, were found to have large effects on the reduction of binge eating. Regarding pharmacotherapy, mainly comprising antidepressants, randomized controlled trials revealed medium effects for the reduction of binge eating. Uncontrolled studies on weight-loss treatments demonstrated moderate reductions of binge eating. Combination treatments did not result in higher effects compared with single-treatment regimens. Except for weight-loss treatment, none of the interventions resulted in a considerable weight reduction.

DISCUSSION

Psychotherapy and structured self-help, both based on cognitive-behavioral interventions, should be recommended as the first-line treatments.

Multivariate therapeutic approach to binge-eating disorder: combined nutritional, psychological and pharmacological treatment

Treatment for binge-eating disorder (BED) is directed towards either the physical or psychopathological impairments, and often does not cover all the alterations characterizing the disease. In 30 BED patients, we monitored the effects of three types of 6-month treatment, randomly assigned to one of the three treatment groups, each consisting of 10 patients. Group 1 received a 1700-kcal diet (21% proteins, 27% lipids, 52% carbohydrate), cognitive-behavioural therapy (CBT), sertraline (50-150 mg/day) and topiramate (25-150 mg/day); group 2 received the same diet, CBT, sertraline; and group 3 received nutritional counselling and CBT. Binge frequency and weight were assessed every month. The Eating Disorder Inventory-2, the Symptoms Check List-90-Revised (SCL-90-R) and the Personality Diagnostic Questionnaire-4-Revised (PDQ-4-R) were administered before and after treatment. Binge frequency and excessive weight decreased significantly only in group 1 patients, in whom improvement was noted in total Eating Disorder Inventory-2 scores and the subitems 'bulimia', 'drive for thinness', 'maturity fear', 'ascetism', in total SCL-90-R scores and in the subitem 'somatization', in PDQ-4-R subitems 'schizotypic personality' and 'dependent personality'. Group 2 patients improved on the SCL-90-R subitems 'depression' and 'interpersonal relationship' and in the PDQ-4-R 'schizoid personality'. Combination therapy seems to be the only fully effective treatment in BED patients.

Long-term course of binge eating disorder and bulimia nervosa: relevance for nosology and diagnostic criteria

OBJECTIVE

To present the twelve-year outcome of binge eating disorder (BED) in 68 female inpatients compared to bulimia nervosa, purging type (BN-P; N = 196).

METHOD

Self and expert ratings focused on the beginning of therapy and the 12-year follow-up.

RESULTS

36% of BED and 28.2% of BN-P patients still received an eating disorder diagnosis at follow-up. Differences between groups were small (Eating Disorder Inventory, Structured Inventory for Anorexic and Bulimic Syndromes, Hopkins Symptom Checklist, Beck Depression Inventory). Similar predictors for BED and BN-P were identified. Psychiatric comorbidity was the predominant predictor of poor outcome in both diagnoses. Predictors for BED outcome were body dissatisfaction, sexual abuse, and impulsivity; self-injury predicted BN-P outcome.

CONCLUSION

Course, outcome, and mortality were similar for BED and BN-P. Both disorders had psychiatric comorbidity as the main predictor of outcome, and there was a diagnostic shift between BED and BN-P over time, pointing to their nosological proximity. Data are relevant for the formulation of DSM-V and ICD-11 diagnostic criteria.

Long-term stability of eating disorder diagnoses

OBJECTIVE

Data on the stability of eating disorder (ED) diagnoses (DSM-IV) over 12 years are presented for a large sample (N = 311) of female eating disordered patients with anorexia nervosa (AN), bulimia nervosa (BN), and binge eating disorder (BED).

METHOD

Assessments were made at the beginning of therapy and 2-, 6-, and 12-year follow-ups. Diagnoses were derived from the Structured Inventory for Anorexic and Bulimic Eating Disorders. Possible diagnostic outcome categories were AN, BN, BED, NOS, no ED, and deceased.

RESULTS

At all follow-ups, more patients changed from AN or BED to BN than vice versa. No diagnostic crossover from AN to BED or vice versa occurred. BED showed the greatest variability and AN had the greatest stability over time. While the long-term outcome of BN and BED is similar, AN had a considerably worse long-term outcome than either BN or BED.

CONCLUSION

Of the ED diagnoses, AN was most stable and BED most variable. The considerable diagnostic flux between BN and BED and similarities in course and outcome of BN and BED point to common biological and psychological maintaining processes. AN and BED are nosologically quite distant.

Cognitive behavioral therapy and fluoxetine for binge eating disorder: two-year follow-up

OBJECTIVE

This study assessed the long-term effects of group behavioral treatment plus individual cognitive behavioral therapy (CBT) and/or fluoxetine in binge eating disorder (BED) patients.

RESEARCH METHODS AND PROCEDURES

A total of 116 individuals were randomized to an initial five-month trial and were followed up over two years. Assessments, including binge frequency, weight, and self-report measures, were administered at pre-treatment, post-treatment, and approximately 6, 12, 18, and 24 months after initial treatment.

RESULTS

Across treatment groups, there was overall improvement over 29 months in binge frequency and in binge abstinence. The odds of binge abstinence 2 years post-treatment were 1.373 times the odds of binge abstinence immediately post-treatment. There was no significant change in weight over the two-year period. Subjects who received individual CBT evidenced lower binge frequency over the two-year follow-up period than patients who had not received individual CBT. Similarly, CBT was associated with increased rates of binge abstinence. There were no main effects of treatment assignment on weight over the two-year follow-up period. There was a significant advantage for fluoxetine assignment over the two-year follow-up period on depressive symptoms.

DISCUSSION

The major significance of the study rests in its examination of the long-term effects of standardized interventions for BED. Our findings provide support for the ideas that short-term treatment may confer long-term benefit and that not all treatments are equivalent in the benefits they confer.

Outcomes of eating disorders: a systematic review of the literature

OBJECTIVE

The RTI International-University of North Carolina at Chapel Hill Evidence-based Practice Center systematically reviewed evidence on factors associated with outcomes among individuals with anorexia nervosa (AN), bulimia nervosa (BN), and binge eating disorder (BED) and whether outcomes differed by sociodemographic characteristics.

METHOD

We searched electronic databases including MEDLINE and reviewed studies published from 1980 to September, 2005, in all languages against a priori inclusion/exclusion criteria and focused on eating, psychiatric or psychological, or biomarker outcomes.

RESULTS

At followup, individuals with AN were more likely than comparisons to be depressed, have Asperger's syndrome and autism spectrum disorders, and suffer from anxiety disorders including obsessive-compulsive disorders. Mortality risk was significantly higher than what would be expected in the population and the risk of suicide was particularly pronounced. The only consistent factor across studies relating to worse BN outcomes was depression. A substantial proportion of individuals continue to suffer from eating disorders over time but BN was not associated with increased mortality risk. Data were insufficient to draw conclusions concerning factors associated with BED outcomes. Across disorders, little to no data were available to compare results based on sociodemographic characteristics.

CONCLUSION

The strength of the bodies of literature was moderate for factors associated with AN and BN outcomes and weak for BED.

Changes in eating self-efficacy and body image following cognitive-behavioral group therapy for binge eating disorder: a clinical study

Binge eating disorder (BED) is a frequent and significant psychiatric comorbidity among individuals seeking treatment for obesity. Cognitive-behavioral therapy (CBT) is frequently recommended for the treatment of obese individuals with BED. However, there is limited investigation into the effectiveness of the specific components of CBT. In this study, we examine the impact of CBT for BED in obese women on self-efficacy for eating behavior and body image issues. Participants were 12 obese women who participated in a 15-week CBT group program. As predicted, results indicated a reduction in binge episode frequency and significant improvements in self-efficacy and body image pre- and posttreatment. These findings support the premise that a structured cognitive-behavioral group treatment program for obese individuals with BED will promote changes in self-efficacy and body image.

What is this thing called BED? Current status of binge eating disorder nosology

OBJECTIVE

Although binge eating has been recognized as a clinically relevant behavior among the obese for more than four decades, the concept of binge eating disorder (BED) as a distinct psychiatric diagnosis is of much more recent origin. This article presents four ways of conceptualizing BED: a distinct disorder in its own right, as a variant of bulimia nervosa, as a useful behavioral subtype of obesity, and as a behavior that reflects psychopathology among the obese. It also summarizes the evidence supporting and disconfirming each model.

METHOD

The literature subsequent to the development of DSM-IV regarding the reliability and validity of BED and related conditions was reviewed selectively.

RESULTS

The preponderance of the evidence suggests that BED differs importantly from purging bulimia nervosa and that BED is not a strikingly useful behavioral subtype of obesity.

DISCUSSION

Further study is needed to definitively determine the validity of BED as a distinct eating disorder.

Predicting the outcome of eating disorders using structural equation modeling

OBJECTIVE

There is a need for models that predict accurately the course of mental disorders.

METHOD

Eating-disordered female inpatients were assessed longitudinally at the beginning of treatment (t1), at the end of treatment (t2), at 2 or 3-year follow-up (t3), and at 6-year follow-up (t4). The sample consisted of 196 women with bulimia nervosa (BN) purging type, 103 women with anorexia nervosa (AN), and 68 women with binge eating disorder (BED; N=367). Confirmatory factor analysis and path analysis were used to predict the women's status at 6-year follow-up.

RESULTS

The results for BN and BED show that the specific eating disorder pathology was influenced mainly by specific eating disorder pathology at earlier time points and not by non-eating-specific (general) psychopathology. Similarly, general psychopathology was influenced mainly by general psychopathology at earlier time points. For AN patients, both categories of psychopathology (eating specific and general) were relevant for the 6-year outcome. The potential impact of 14 factors on the level of pathology was estimated (a) at baseline (at the beginning of treatment), (b) during the course of illness (baseline controlled), and (c) on the 6-year outcome of eating disorders (baseline and course controlled). Although there were many correlations between potential factors and baseline pathology, there was only a limited number of significant correlations with the 6-year outcome. This effect was mediated largely by the level of general psychopathology.

DISCUSSION

The models for outcome prediction based on structural equation modeling techniques were very similar for BN and BED. For both BN and BED, there were almost entirely separate predictions for the specific eating disorder on the one hand and non-eating-related (general) psychopathology on the other hand. This was true to a lesser degree for AN.

CONCLUSIONS

The use of refined path analytic methods in follow-up studies on larger general populations will be helpful to increase our understanding of the course of illness of psychiatric disorders.

Expressed emotion, family environment, and parental bonding in bulimia nervosa: a 6-year investigation

As part of a prospective, long-term treatment study, 30 in-patients with bulimia nervosa (BN) were divided into groups with high and low expressed emotion (EE) family backgrounds according to the Camberwell Family Interview, and followed for a period of six years. The high EE group initially showed significantly more psychopathology than the low EE group. No group x time interactions were found, but the high EE group showed a worse outcome on the "conflict" and "organisation" subscales of the Family Environment Scale. They also showed significantly more eating disorder pathology according to the Eating Disorder Inventory (EDI) and the Structured Interview for anorexia nervosa (AN) and BN before treatment at discharge, after two years and, to some degree, even after six years. Depth of depression (Beck Depression Inventory) was significantly higher in the high EE group at admission (moderate depression), discharge and after the 6-year follow-up (still slight depression). The Parental Bonding Instrument (PBI) showed no differences between the high EE and low EE groups, but the individuals with "affectionless control" according to the PBI had more negative scores on three of the subscales of the Family Environment Scale (FES). In brief, the high EE individuals with BN were initially sicker and did not fully catch up over time in comparison with the symptomatic recovery of the low EE individuals. These data suggest that EE status upon admission to in-patient treatment is a relevant predictor of the severity and course of BN and depressive symptoms.

What happens to eating disorder outpatients who withdrew from therapy?

OBJECTIVE

Dropouts are frequent among eating disorder (ED) patients, but less is known about their natural history. This paper assesses the outcome of outpatients who dropped out from a therapy programme and its possible causes.

MATERIAL AND METHODS

From 1992 to 1994, we assessed 222 ED subjects. Psychiatrists expert in EDs evaluated these subjects by defining baseline parameters and diagnosis was made according to the 3rd revisioned edition of the Diagnostic and Statistical Manual of Mental Disorders. One hundred and twenty-eight subjects (57%) dropped out during the treatment. In 1997, we contacted them, reassessed the same baseline parameters and asked for a self-judgment about their social and clinical condition during the previous 2-5 years. Patients were classified as "improved" and "not improved" (stationary or worse) according to their social, physical and psychological condition. The relation between baseline condition and outcome was determined statistically.

RESULTS

Seventy-one percent of subjects were "improved" and no deaths were recorded. A significant correlation was found between "duration of illness" and no treatment following a dropout.

DISCUSSION

The high percentage of improvement among dropouts was unexpected. Shorter duration of illness and lack of specific therapy in the improved patients suggest the existence of a subset of ED patients with acute onset and a spontaneous tendency to improve. This point obviously requires further investigation.

Binge eating disorder: a review

Binge eating disorder (BED) is a new proposed eating disorder in the DSM-IV. BED is not a formal diagnosis within the DSM-IV, but in day-to-day clinical practice the diagnosis seems to be generally accepted. People with the BED-syndrome have binge eating episodes as do subjects with bulimia nervosa, but unlike the latter they do not engage in compensatory behaviours. Although the diagnosis BED was created with the obese in mind, obesity is not a criterion. This paper gives an overview of its epidemiology, characteristics, aetiology, criteria, course and treatment. BED seems to be highly prevalent among subjects seeking weight loss treatment (1.3-30.1%). Studies with compared BED, BN and obesity indicated that individuals with BED exhibit levels of psychopathology that fall somewhere between the high levels reported by individuals with BN and the low levels reported by obese individuals. Characteristics of BED seemed to bear a closer resemblance to those of BN than of those of obesity.A review of RCT's showed that presently cognitive behavioural treatment is the treatment of choice but interpersonal psychotherapy, self-help and SSRI's seem effective. The first aim of treatment should be the cessation of binge eating. Treatment of weight loss may be offered to those who are able to abstain from binge eating.

Effect of a very low calorie diet on the diagnostic category of individuals with binge eating disorder

OBJECTIVE

This study examined the factors associated with the diagnostic outcome of obese individuals with and without binge eating disorder (BED) 1 year after completing a very low calorie diet (VLCD) program.

METHOD

Participants included 63 individuals with BED, 36 individuals with subthreshold BED, and 29 individuals with no binge eating symptoms. Diagnoses before and after VLCD were obtained using the Structured Clinical Interview for DSM-IV (SCID) interviews. The severity of psychiatric symptoms were assessed using various rating scales.

RESULTS

Fifty-six percent (n = 36) of the participants who met criteria for BED at baseline did not meet diagnostic criteria 1 year later. None of the baseline factors were statistically associated with outcome.

DISCUSSION

Although the main hypothesis was not supported, absence of a BED diagnosis at 12-month follow-up after a VLCD diet appears to be associated with less weight gain at 1-year follow-up regardless of baseline diagnosis.

Epidemiology and mortality of eating disorders

Although considerable progress has been made over the past 2 decades in the field of eating-disorder epidemiology, there is room for improvement. Eating disorder diagnoses for children, need assessment, prospective longitudinal studies, studies of natural cause, treatment dose-effect studies, and bias are all areas that need careful consideration. Clinicians should consider establishing a Cochrane database for eating disorders. The mortality studies reviewed in this article are dominated by small, sparse, unbalanced data sets, and publication bias and bias caused by loss to follow-up limits the validity of the reported findings. Some methodologic advice is given in the hope that some of the more obvious pitfalls can be avoided in future research.

Six-year course and outcome of anorexia nervosa

OBJECTIVE

Since there are discrepant findings in the literature, we studied the longer-term course in a large sample of 103 DSM-IV anorexia nervosa (AN) patients.

METHOD

Assessments were made at four points of time: beginning of therapy, end of therapy, 2-year follow-up, and 6-year follow-up. Self-rating scales as well as expert-rating interview data were used. Eating disorder-specific and general psychopathology were assessed. These data were also compared with data on the 6-year course of patients with bulimia nervosa and binge eating disorder, respectively, who were treated at the same institution at about the same time.

RESULTS

The participation rate at the two follow-ups was high (97.9% of those alive). The general pattern of results over time of those alive at 6-year follow-up was as follows: substantial improvement during therapy, moderate (in many instances nonsignificant) decline during the first 2 years posttreatment, and further improvement from 3 to 6 years posttreatment. At the time of the 6-year follow-up, 26.8% had AN, 9. 9% had bulimia nervosa-purging type (BN-P), 2.0% were classified as eating disorder not otherwise specified (ED-NOS), all diagnosed according to DSM-IV criteria; more than one half (55.4%) showed no major DSM-IV eating disorder. Based on an operationalized global outcome score at 6-year follow-up, 34.7% had a good outcome, 38.6% an intermediate outcome, 20.8% a poor outcome, and 6 of 101 persons (5.9%) were deceased. Body mass index was 17.9 +/- 2.8 at the 6-year follow-up; amenorrhea was still found in 23.9%.

DISCUSSION

In comparison to samples with bulimia nervosa or binge eating disorder, the 6-year course of anorexia nervosa was less favorable. Mortality was rather high and symptomatic recovery protracted; predictors of unfavorable 6-year course were the presence of binges during 4 weeks before index treatment, psychiatric comorbidity, and low body weight at discharge from index treatment.