Anorexia nervosa treatment: a systematic review of randomized controlled trials

Every mistake is a treasure: Lessons learned from the TRIANGLE trial for anorexia nervosa

BACKGROUND

Despite several decades of treatment research for anorexia nervosa (AN), many of the same questions remain: how to boost enrollment, engage participants, prevent attrition, and meet the needs of a diverse patient population within the rigorous framework of a randomized controlled trial (RCT).

METHODS

In this research forum, we highlight some of the challenges and opportunities observed over the course of TRIANGLE, the largest RCT for severe AN treatment in the UK to date. We discuss strategies for addressing common challenges and avoiding common pitfalls and propose solutions to future researchers seeking to conduct treatment research in AN.

RESULTS

Our experience underscores the value of involving people with lived experience at every stage of intervention research. We offer additional recommendations for treatment researchers, including, (1) early qualitative research to identify patient barriers and obstacles, (2) clear, systematic collaboration with clinical sites for patient recruitment and passive data collection, (3) careful consideration of assessment metrics, including repeated measurement of quality of life, (4) adopting a flexible, patient-centered approach to clinical trial research, and (5) considering the unique needs and obstacles that might impact carer participation in research and their ability to provide support to their loved ones.

DISCUSSION

We hope that these lessons learned will prove fruitful for the next generation of researchers embarking on treatment research for AN.

PUBLIC SIGNIFICANCE

Using the TRIANGLE trial as an illustrative case study, we highlight the value of lived experience and codesign for developing and testing interventions for AN. We offer several lessons learned over the course of the trial, pertaining to trial enrollment, retention and engagement, measurement of outcomes, and research adaptations for real-world settings, and hope that these recommendations facilitate future treatment research for AN.

Adaptive design trials in eating disorder research: A scoping review

OBJECTIVE

This scoping review sought to map the breadth of literature on the use of adaptive design trials in eating disorder research.

METHOD

A systematic literature search was conducted in Medline, Scopus, PsycInfo, Emcare, Econlit, CINAHL and ProQuest Dissertations and Theses. Articles were included if they reported on an intervention targeting any type of eating disorder (including anorexia nervosa, bulimia nervosa, binge-eating disorder, and other specified feeding or eating disorders), and employed the use of an adaptive design trial to evaluate the intervention. Two independent reviewers screened citations for inclusion, and data abstraction was performed by one reviewer and verified by a second.

RESULTS

We identified five adaptive design trials targeting anorexia nervosa, bulimia nervosa and binge-eating disorder conducted in the USA and Australia. All employed adaptive treatment arm switching based on early response to treatment and identified a priori stopping rules. None of the studies included value of information analysis to guide adaptive design decisions and none included lived experience perspectives.

DISCUSSION

The limited use of adaptive designs in eating disorder trials represents a missed opportunity to improve enrolment targets, attrition rates, treatment outcomes and trial efficiency. We outline the range of adaptive methodologies, how they could be applied to eating disorder research, and the specific operational and statistical considerations relevant to adaptive design trials.

PUBLIC SIGNIFICANCE

Adaptive design trials are increasingly employed as flexible, efficient alternatives to fixed trial designs, but they are not often used in eating disorder research. This first scoping review identified five adaptive design trials targeting anorexia nervosa, bulimia nervosa and binge-eating disorder that employed treatment arm switching adaptive methodology. We make recommendations on the use of adaptive design trials for future eating disorder trials.

Energy expenditure during nutritional rehabilitation: a scoping review to investigate hypermetabolism in individuals with anorexia nervosa

BACKGROUND

Weight gain and nutritional rehabilitation are essential first steps to achieve medical stabilization in anorexia nervosa, and frequent resistance to weight gain requires patients to consume high kilocalorie loads. Adaptive hypometabolism is common when patients begin treatment, and rebound hypermetabolism is suspected to be a significant barrier to weight gain. The aim of this review was to summarize existing data describing metabolic changes in anorexia nervosa during weight restoration. The reported findings challenge current hypotheses of weight gain resistance and highlight key areas for future research.

METHODS

Using scoping review guidelines, three databases were searched for studies investigating metabolic changes in anorexia nervosa before and after renourishment. Two reviewers systematically screened the titles and abstracts of 447 articles, and full-text versions of 106 studies were assessed for eligibility. A total of 36 studies were included for review. Data regarding the study description, sample population (including age, weight, BMI, duration of treatment, and caloric intake), and metabolic variable descriptions were extracted.

RESULTS

Female patients with anorexia nervosa from studies across 13 countries were included. Across the studies, average BMI increased from 13.7 kg/m2 at admission to 17.57 kg/m2. Patients presented to treatment with clinically reduced energy expenditure levels. After varying levels of nutritional rehabilitation and weight restoration, measured energy expenditure increased significantly in 76% of the studies. Energy expenditure values at the second timepoint increased to the standard range for normal weight female teenagers and adults. Despite these increases, the studies do not indicate the presence of a hypermetabolic state during renourishment. Additionally, all studies including both measured and predicted energy expenditure reported that predicted energy expenditure overestimated measured values.

CONCLUSION

This study provides a detailed evaluation of the literature investigating energy expenditure and metabolic rate in patients with anorexia nervosa before and following a period of renourishment. The findings from this review identify important gaps in the current beliefs of energy expenditure in anorexia nervosa and highlight a need for further exploration of metabolic alterations during weight restoration.

Associations between disordered eating and body focused repetitive behaviors in college students

Objective: College students with disordered eating (DE) are at increased risk of body focused repetitive behaviors (BFRBs). Both DE and BFRBs are described as impulsive and compulsive. However, the associations of impulsive DE with impulsive BFRBs and compulsive DE with compulsive BFRBs have not been examined. Methods: 191 college-aged students completed a survey of BFRBs and DE. Results: Participants who reported hair pulling were twice as likely to report clinically significant DE than those who denied hair pulling (p = .022). Participants who endorsed distressing hair pulling (p = .026), skin picking (p = .052), and nail biting (p = .094) were twice as likely to report clinically significant DE than those who were not distressed by these behaviors. Evidence did not support the association of BFRBs and DE along an impulsive/compulsive continuum. Conclusions: Results suggest that BFRBs and DE often co-occur, and the role of impulsivity and compulsivity in these behaviors is complex.

Using machine learning with passive wearable sensors to pilot the detection of eating disorder behaviors in everyday life

BACKGROUND

Eating disorders (ED) are serious psychiatric disorders, taking a life every 52 minutes, with high relapse. There are currently no support or effective intervention therapeutics for individuals with an ED in their everyday life. The aim of this study is to build idiographic machine learning (ML) models to evaluate the performance of physiological recordings to detect individual ED behaviors in naturalistic settings.

METHODS

From an ongoing study (Final N = 120), we piloted the ability for ML to detect an individual's ED behavioral episodes (e.g. purging) from physiological data in six individuals diagnosed with an ED, all of whom endorsed purging. Participants wore an ambulatory monitor for 30 days and tapped a button to denote ED behavioral episodes. We built idiographic (N = 1) logistic regression classifiers (LRC) ML trained models to identify onset of episodes (~600 windows) v. baseline (~571 windows) physiology (Heart Rate, Electrodermal Activity, and Temperature).

RESULTS

Using physiological data, ML LRC accurately classified on average 91% of cases, with 92% specificity and 90% sensitivity.

CONCLUSIONS

This evidence suggests the ability to build idiographic ML models that detect ED behaviors from physiological indices within everyday life with a high level of accuracy. The novel use of ML with wearable sensors to detect physiological patterns of ED behavior pre-onset can lead to just-in-time clinical interventions to disrupt problematic behaviors and promote ED recovery.

Elevated lipid class concentrations in females with anorexia nervosa before and after intensive weight restoration treatment-A lipidomics study

OBJECTIVE

To study the plasma lipidome of patients with anorexia nervosa (AN) before and after weight restoration treatment and report associations with AN subtypes and oral contraceptive pill (OCP) usage.

METHODS

Quantitative shotgun lipidomics analysis was used to study plasma lipids of 50 female patients with AN before and after weight restoration treatment and 50 healthy female controls (HC). The AN group was assessed with blood samples and questionnaires before and after weight restoration.

RESULTS

In total we quantified 260 lipid species representing 26 lipid classes of which 13 lipid class concentrations were elevated in patients with AN at admission compared with HC. Lipid classes remained elevated after weight restoration treatment of 84 days (median; interquartile range 28), and only the concentration of the ceramide lipid class increased between pre- and post-treatment (p = .03), whereas lysophosphatidylcholine (LPC, p = .02), ether-linked Phosphatidylcholine (LPCO, p = .02), and lysophosphatidylethanolamine (LPE, p = .009) decreased.

CONCLUSION

In AN, 13 out of 26 lipid class concentrations were elevated at admission and remained elevated post-treatment. Ceramides increased further between pre- and post-weight restoration treatment, which could be related to the rapid weight gain during re-nutrition. Further research is needed to elucidate the effects of weight restoration treatment on short- and long-term lipid profiles in individuals with AN.

PUBLIC SIGNIFICANCE STATEMENT

Lipidomics research can increase the understanding of AN, a complex and potentially life-threatening eating disorder. By analyzing lipids, or fats, in the body, we can identify biological markers that may inform diagnosis and develop more effective treatments. This research can also shed light on the underlying mechanisms of the disorder, leading to a better understanding of the processes involved in eating behavior.

Microbiota in anorexia nervosa: potential for treatment

Anorexia nervosa (AN) is characterised by the restriction of energy intake in relation to energy needs and a significantly lowered body weight than normally expected, coupled with an intense fear of gaining weight. Treatment of AN is currently based on psychological and refeeding approaches, but their efficacy remains limited since 40% of patients after 10 years of medical care still present symptoms of AN. The intestine hosts a large community of microorganisms, called the "microbiota", which live in symbiosis with the human host. The gut microbiota of a healthy human is dominated by bacteria from two phyla: Firmicutes and, majorly, Bacteroidetes. However, the proportion in their representation differs on an individual basis and depends on many external factors including medical treatment, geographical location and hereditary, immunological and lifestyle factors. Drastic changes in dietary intake may profoundly impact the composition of the gut microbiota, and the resulting dysbiosis may play a part in the onset and/or maintenance of comorbidities associated with AN, such as gastrointestinal disorders, anxiety and depression, as well as appetite dysregulation. Furthermore, studies have reported the presence of atypical intestinal microbial composition in patients with AN compared with healthy normal-weight controls. This review addresses the current knowledge about the role of the gut microbiota in the pathogenesis and treatment of AN. The review also focuses on the bidirectional interaction between the gastrointestinal tract and the central nervous system (microbiota-gut-brain axis), considering the potential use of the gut microbiota manipulation in the prevention and treatment of AN.

Co-producing principles to guide health research: an illustrative case study from an eating disorder research clinic

BACKGROUND

There is significant value in co-produced health research, however power-imbalances within research teams can pose a barrier to people with lived experience of an illness determining the direction of research in that area. This is especially true in eating disorder research, where the inclusion of co-production approaches lags other research areas. Appealing to principles or values can serve to ground collaborative working. Despite this, there has not been any prior attempt to co-produce principles to guide the work of a research group and serve as a basis for developing future projects.

METHODS

The aim of this piece of work was to co-produce a set of principles to guide the conduct of research within our lived experience led research clinic, and to offer an illustrative case for the value of this as a novel co-production methodology. A lived experience panel were recruited to our eating disorder research group. Through an iterative series of workshops with the members of our research clinic (composed of a lived experience panel, clinicians, and researchers) we developed a set of principles which we agreed were important in ensuring both the direction of our research, and the way in which we wanted to work together.

RESULTS

Six key principles were developed using this process. They were that research should aim to be: 1) real world-offering a clear and concrete benefit to people with eating disorders, 2) tailored-suitable for marginalised groups and people with atypical diagnoses, 3) hopeful-ensuring that hope for recovery was centred in treatment, 4) experiential-privileging the 'voice' of people with eating disorders, 5) broad-encompassing non-standard therapeutic treatments and 6) democratic-co-produced by people with lived experience of eating disorders.

CONCLUSIONS

We reflect on some of the positives as well as limitations of the process, highlighting the importance of adequate funding for longer-term co-production approaches to be taken, and issues around ensuring representation of minority groups. We hope that other health research groups will see the value in co-producing principles to guide research in their own fields, and will adapt, develop, and refine this novel methodology.

The embodiment of childhood abuse and anorexia nervosa: A body mapping study

Childhood trauma has long been implicated in the development of anorexia nervosa and is known to impact more women than men. Still, less is known about the meaning women attribute to food and bodily practices and how they contribute to feminine subjectivity. In this article, we examine the subjective experiences of women with histories of childhood abuse and anorexia and women who did not develop an eating disorder. Through a visual narrative analysis of eight body maps and narratives, we identified five themes: "time and the body have a way of showing what matters," "femininity and family," "sexual subjectivities and food meanings," "voices, dissociation, and sexual subjectivities," and "religion and healthism." In women with anorexia, specific eating and bodily practices reconstructed the traumatic events to align with the available cultural discourses related to health, religion, and family and had implications for their feminine and sexual subjectivities and self-worth. This research showcased how arts-based methodologies add value and advance knowledge about the role of culturally available representations in the development of anorexia and has implications for therapy and prevention of anorexia.

Efficacy of educational interventions in adolescent population with feeding and eating disorders: a systematic review

BACKGROUND

Educational interventions are a key element in the care of young patients with feeding and eating disorders, forming part of the majority of therapeutic approaches. The aim of this review is to evaluate the impact of educational interventions in adolescents with feeding and eating disorders.

METHODS

Following the PRISMA recommendations electronic databases were searched up to 29 June 2023. Studies related to educational interventions in young population diagnosed with feeding and eating disorders (anorexia nervosa, avoidant/restrictive food intake disorder, bulimia nervosa, pica and ruminative disorders and binge- eating disorder) in Spanish and English language, without temporal limitation, were located in the databases: PubMed, Scopus, CINAHL, Cochrane Library, PsycINFO, CUIDEN, DIALNET, and ENFISPO. A search in the databases of grey literature was performed in OpenGrey and Teseo. The review protocol was registered in PROSPERO (CRD42020167736).

RESULTS

A total of 191 articles were selected from the 9744 citations screened. Ten publications were included. The results indicated variability between educational programs, including individual and group interventions, learning techniques and various research methodologies. Variables such as learning, attitudinal and perceptual changes, anthropometric parameters, symptom improvement, normalization of eating patterns, evaluation of the program and cognitive flexibility were identified. The risk of bias was high due to the low methodological quality of a large number of studies analyzed.

CONCLUSION

The results indicate that educational interventions can influence the improvement of knowledge level and have a positive effect on health outcomes. Although education is a common practice in the treatment of these pathologies, high-quality studies were not identified. Thus, this review concludes that additional evidence is needed to evaluate the effectiveness of educational programs, with further research studies, especially randomized controlled trials, to confirm these results.

LEVEL OF EVIDENCE

Level I: Systematic review.

Global Research Trends and Hotspots Analysis of the Scientific Production of Amitriptyline: A Bibliometric Approach

Amitriptyline was first introduced as a medication to treat depression. Over time, this substance has been used to treat other conditions, such as gastrointestinal disorders, fibromyalgia, neuropathic pain, and analgesia, among others. However, there are no published studies that provide a broad view of the possible motivations that have led to changes in the use of amitriptyline. In this study, we have identified the landscape of use for amitriptyline based on knowledge mapping of the 100 most-cited articles about this drug. We searched Web of Science Core Collection without time and language restrictions. We obtained 14,446 results, but we only used the 100 most-cited articles that had amitriptyline as the object of study. We collected the following information from each article: authors, country of the corresponding authors, year of publication, citation count, citation density (number of citations per year), and keywords. In addition, we seek to map in the chosen articles study design and research findings. We found that since 1980, the use of amitriptyline has expanded beyond depression, moving to off-label use to treat a variety of diseases and conditions, including post-herpetic neuralgia, neuropathic pain, primary fibrosis, fibromyalgia, and migraine, can be considered a drug with more clinical applicability than its original clinical indication.

A Pilot Open Trial of a Digital Mindfulness-Based Intervention for Anorexia Nervosa

Anorexia nervosa (AN) is a chronic and debilitating psychiatric disorder. Unfortunately, current treatments are lacking, with only 30-50% of individuals with AN recovering after treatment. We developed a beta-version of a digital mindfulness-based intervention for AN called Mindful Courage-Beta, which includes: (a) one foundational multimedia module; (b) 10 daily meditation mini-modules; (c) emphasis on a core skill set called the BOAT (Breathe, Observe, Accept, Take a Moment); and (d) brief phone coaching for both technical and motivational support. In this open trial, we aimed to evaluate (1) acceptability and feasibility; (2) intervention skill use and its association with state mindfulness in daily life; and (3) pre-to-post changes in target mechanisms and outcomes. Eighteen individuals with past-year AN or past-year atypical AN completed Mindful Courage-Beta over 2 weeks. Participants completed measures of acceptability, trait mindfulness, emotion regulation, eating disorder symptoms, and body dissatisfaction. Participants also completed ecological momentary assessment of skill use and state mindfulness. Acceptability ratings were good (ease-of-use: 8.2/10, helpfulness: 7.6/10). Adherence was excellent (100% completion for foundational module and 96% for mini-modules). Use of the BOAT in daily life was high (1.8 times/day) and was significantly associated with higher state mindfulness at the within-person level. We also found significant, large improvements in the target mechanisms of trait mindfulness (d = .96) and emotion regulation (d = .76), as well as significant, small-medium to medium-large reductions in eating disorder symptoms (ds = .36-.67) and body dissatisfaction (d = .60). Changes in trait mindfulness and emotion regulation had medium-large size correlations with changes in global ED symptoms and body dissatisfaction (rs = .43 - .56). Mindful Courage-Beta appears to be promising and further research on a longer, refined version is warranted.

Gaining consensus on clinical quality outcomes for eating disorders: Framework for the development of an Australian national minimum dataset

OBJECTIVES

Eating disorders (EDs) are complex psychiatric illnesses requiring multidisciplinary care across both mental and medical healthcare settings. Currently, no nationally comprehensive, consistent, agreed on or mandated data set or data collection strategy exists for EDs in Australia: thus, little is known about the outcomes of care nor treatment pathways taken by individuals with EDs. InsideOut Institute was contracted by the Australian Government Department of Health to develop a minimum dataset (MDS) for the illness group with consideration given to data capture mechanisms and the scoping of a national registry.

DESIGN

A four-step modified Delphi methodology was used, including national consultations followed by three rounds of quantitative feedback by an expert panel.

SETTING

Due to social distancing protocols throughout the global SARS-CoV-2 pandemic, the study was conducted online using video conferencing (Zoom and Microsoft Teams) (Step 1), email communication and the REDCap secure web-based survey platform (Steps 2-4).

PARTICIPANTS

14 data management organisations, 5 state and territory government departments of health, 2 Aboriginal and Torres Strait Islander advising organisations and 28 stakeholders representing public and private health sectors across Australia participated in consultations. 123 ED experts (including lived experience) participated in the first quantitative round of the Delphi survey. Retention was high, with 80% of experts continuing to the second round and 73% to the third.

MAIN OUTCOME MEASURES

Items and categories endorsed by the expert panel (defined a priori as >85% rating an item or category 'very important' or 'imperative').

RESULTS

High consensus across dataset items and categories led to the stratification of an identified MDS. Medical status and quality of life were rated the most important outcomes to collect in an MDS. Other items meeting high levels of consensus included anxiety disorders, depression and suicidality; type of treatment being received; body mass index and recent weight change.

CONCLUSIONS

Understanding presentation to and outcomes from ED treatment is vital to drive improvements in healthcare delivery. A nationally agreed MDS has been defined to facilitate this understanding and support improvements.

Systematic review: Exploring the monitoring and reporting of unwanted events in psychotherapy trials for anorexia nervosa

OBJECTIVE

If a psychotherapeutic intervention has the capacity to produce positive change, the "deterioration effect" theory holds that it must also have the potential for negative effects. However, the definition, measurement, and reporting of unwanted events in psychotherapy is a topic of ongoing discussion. At present this area is under-explored in interventions for anorexia nervosa (AN), a severe mental illness associated with high medical and psychiatric risks. The aim of this article was to undertake a systematic review of published randomized controlled trials (RCTs) evaluating psychotherapeutic interventions for AN, and to assess how unwanted events were defined, monitored, and reported alongside the trial's key findings.

METHOD

Using a systematic review methodology, this article identified 23 RCTs through database searches meeting eligibility criteria. Results are presented using a narrative summary approach.

RESULTS

Unwanted event reporting varied widely, both regarding definitions of key unwanted events (such as non-compliance or symptom deterioration) and in the amount of detail captured in each paper.

DISCUSSION

The review identified two key issues: firstly, a lack of consistent definitions and unclear causality made it difficult to distinguish between unwanted events, and adverse events caused by the interventions. Secondly, it highlighted the difficulty of defining unwanted events where different studies have different populations and goals. Recommendations are made around how the area of defining, monitoring, and reporting unwanted events in RCTs for AN can be taken forward.

PUBLIC SIGNIFICANCE

Whilst psychotherapies can be effective in treating mental health conditions, negative or unwanted events can sometimes occur. This review explored how RCTs examining psychotherapy for AN report how they monitor the safety of participants, and how they report unwanted events. We found that the reporting was often inconsistent or hard to interpret, and we have made recommendations for how this can be improved in the future.

Acceptability of using a nasogastric refeeding protocol with adult patients with medically unstable eating disorders

RATIONALE, AIMS AND OBJECTIVES

Nasogastric feeding is becoming commonly used to support patients with medically compromised eating disorders. Previous research has demonstrated the safety of this approach, however there is limited evidence as to how adult patients and staff perceive this feeding method. This study aimed to describe the acceptability of a nasogastric refeeding protocol with adult patients with medically unstable eating disorders and the staff involved in their treatment.

METHOD

This was a qualitative exploratory study using semi-structured interviews conducted in acute medical wards of a tertiary hospital where nasogastric nutrition is the sole source of nutrition for the first 7 days of the eating disorder admission. Data were analysed using the Framework method.

RESULTS

Eight patients (100% female, median: 22 years old, n = 6 diagnosed with anorexia nervosa) and 12 staff members (medical n = 5, nursing n = 5, dietitians n = 2; median: 8.5 years clinical experience) were interviewed. Patients reported that nasogastric feeding was tolerable, however concerns were raised regarding communication and the desire for concurrent oral feeding. Acceptability from staff was influenced by perceived competence, confidence, tensions around patient-centred care, and working with stigma and ambivalence.

CONCLUSIONS

Consideration needs to be given as to whether a 'nil by mouth' status during nasogastric feeding further impacts recommencing an oral diet to progress treatment. Improvements are required within the current service, including improved communication, additional educational resources for patients, and allowing patients to partake in decision-making as able.

Risk factors for eating disorders: findings from a rapid review

BACKGROUND

Risk factors represent a range of complex variables associated with the onset, development, and course of eating disorders. Understanding these risk factors is vital for the refinement of aetiological models, which may inform the development of targeted, evidence-based prevention, early intervention, and treatment programs. This Rapid Review aimed to identify and summarise research studies conducted within the last 12 years, focusing on risk factors associated with eating disorders.

METHODS

The current review forms part of a series of Rapid Reviews to be published in a special issue in the Journal of Eating Disorders, funded by the Australian Government to inform the development of the National Eating Disorder Research and Translation Strategy 2021-2031. Three databases were searched for studies published between 2009 and 2021, published in English, and comprising high-level evidence studies (meta-analyses, systematic reviews, moderately sized randomised controlled studies, moderately sized controlled-cohort studies, or population studies). Data pertaining to risk factors for eating disorders were synthesised and outlined in the current paper.

RESULTS

A total of 284 studies were included. The findings were divided into nine main categories: (1) genetics, (2) gastrointestinal microbiota and autoimmune reactions, (3) childhood and early adolescent exposures, (4) personality traits and comorbid mental health conditions, (5) gender, (6) socio-economic status, (7) ethnic minority, (8) body image and social influence, and (9) elite sports. A substantial amount of research exists supporting the role of inherited genetic risk in the development of eating disorders, with biological risk factors, such as the role of gut microbiota in dysregulation of appetite, an area of emerging evidence. Abuse, trauma and childhood obesity are strongly linked to eating disorders, however less conclusive evidence exists regarding developmental factors such as role of in-utero exposure to hormones. Comorbidities between eating disorders and mental health disorders, including personality and mood disorders, have been found to increase the severity of eating disorder symptomatology. Higher education attainment, body image-related factors, and use of appearance-focused social media are also associated with increased risk of eating disorder symptoms.

CONCLUSION

Eating disorders are associated with multiple risk factors. An extensive amount of research has been conducted in the field; however, further studies are required to assess the causal nature of the risk factors identified in the current review. This will assist in understanding the sequelae of eating disorder development and in turn allow for enhancement of existing interventions and ultimately improved outcomes for individuals.

Brain reward response in adolescents and young adults with anorexia nervosa is moderated by changes in body weight and sweetness perception

OBJECTIVE

Anorexia nervosa (AN) is a severe psychiatric illness with complex etiology. Recently, we found elevated striatal brain response to sweet taste stimuli in adolescents and young adults with AN. Here, we tested the hypothesis that nutritional rehabilitation normalizes prediction error activation, a measure for dopamine-related reward circuit response, to salient caloric taste stimuli in AN.

METHODS

A total of 28 individuals with AN (age = 16 ± 2 years; body mass index [BMI] = 16 ± 1) who previously underwent brain imaging while performing a taste prediction error task using sucrose as salient caloric stimulus, participated in a second brain imaging scan (BMI = 18 ± 1) after intensive specialized eating disorder treatment (41 ± 15 days). A total of 31 healthy controls (age = 16 ± 3 years; BMI = 21 ± 2) were also studied on two occasions.

RESULTS

At baseline, individuals with AN demonstrated an elevated salience response in bilateral caudate head and nucleus accumbens, and right ventral striatum. At the second scan, elevated response was only found in the right nucleus accumbens. A moderator analysis indicated that greater increase in BMI and greater decrease in sweetness perception predicted lesser prediction error response at the second scan in AN.

CONCLUSION

Consistent with the previously reported monetary stimulus-response, elevated taste prediction error response in AN was largely absent after weight restoration. This study indicates that changes in BMI and sweet taste perception are independent moderators of change of brain salience response in adolescents and young adults with AN. The study points toward dynamic changes in the brain reward circuitry in AN and highlights the importance of nutrition and weight restoration in that process.

PUBLIC SIGNIFICANCE STATEMENT

AN is a severe psychiatric illness. Biological factors that integrate neurobiology and behavior could become important targets to improve treatment outcome. This study highlights the importance of weight normalization and taste perception the normalization of brain function, and food type or taste-specific interventions could help in the recovery process. Furthermore, the study suggests that food-related and nonfood-related reward processing adapts to illness state in AN.

Delusionality of beliefs among 50 adult females with severe and extreme anorexia nervosa upon admission to an acute medical stabilization facility

We aimed to evaluate whether the content of eating/body image-related beliefs in individuals with anorexia nervosa (AN) was associated with important aspects of eating disorder (ED) psychopathology. Females with AN completed assessments within 96 hours of admission to an inpatient medical stabilization program. Study staff administered the Brown Assessment of Beliefs Scale and participants completed self-report measures. We derived belief content domains using an inductive approach and examined associations between beliefs and clinical variables. The following belief categories emerged (% with a belief in that category): body image beliefs (64%), food beliefs (30%), body function beliefs (20%), rejection of illness beliefs (12%), morality beliefs (10%), and control beliefs (6%). No one belief domain was significantly associated with greater delusional intensity. However, findings indicate that greater delusionality was generally associated with worse ED psychopathology.

The impact of personality disorders and personality traits on psychotherapy treatment outcome of eating disorders: A systematic review

A significant proportion of those with eating disorders (EDs) do not respond to first-line treatments. This systematic review was conducted to identify whether personality disorders (PDs)/traits predict or moderate ED treatment outcomes and whether these outcomes were differentially influenced by ED or PD diagnostic subtypes, or treatment approach. A comprehensive systematic literature search was conducted using the PRISMA guidelines. A total of seven randomised controlled trials (RCTs) plus four follow-up studies were reviewed investigating the impact of PD and PD traits on treatment outcomes for EDs. The majority indicated that PD had some impact on treatment outcomes. Outcome measures and time-point measurements varied across studies. Included studies suggested that bulimia nervosa treatment outcomes were not hindered by co-morbidity of borderline PD; however, psychiatric impairment remained high at post-treatment and follow-up. Cluster C PDs were found to negatively impact treatment outcomes for binge ED and attrition rates for anorexia nervosa. Included studies suggested that interventions that addressed aspects of personality pathology showed greater main effects for ED treatment outcomes. There is an urgent need for future RCTs on ED treatments to include routine measures of core personality features to allow their impacts to be more thoroughly examined and for psychotherapies to be tailored accordingly.

A network approach can improve eating disorder conceptualization and treatment

Eating disorders are severe mental illnesses with the second highest mortality rate of all psychiatric illnesses. Eating disorders are exceedingly deadly because of their complexity. Specifically, eating disorders are highly comorbid with other psychiatric illnesses (up to 95% of individuals with an eating disorder have at least one additional psychiatric illness), have extremely heterogeneous presentations, and individuals often migrate from one specific eating disorder diagnosis to another. In this Perspective, we propose that understanding eating disorder comorbidity and heterogeneity via a network theory approach offers substantial benefits for both conceptualization and treatment. Such a conceptualization, strongly based on theory, can identify specific pathways that maintain psychiatric comorbidity, how diagnoses vary across individuals, and how specific symptoms and comorbidities maintain illness for one individual, thereby paving the way for personalized treatment.

Efficacy and safety of antipsychotics and antidepressants in the treatment of anorexia nervosa: a systematic review

INTRODUCTION

The recommendations of the current guidelines are based on low quality evidence. Periodic updating is required, taking recent evidence into consideration.

OBJECTIVE

To synthesise the best available clinical evidence on the efficacy and safety of second-generation antidepressants and antipsychotics in patients with anorexia nervosa.

METHODS

Systematic review (CRD42020150577). We searched PubMed, SCOPUS, Ovid(Cochrane), EMBASE and LILACS for randomised clinical trials performed in patients with anorexia nervosa that evaluated the use of second-generation antipsychotics or oral antidepressants, at any dose and for any length of time, in outpatient and/or hospital treatment, taking weight (body mass index), psychopathological entities and safety as results.

RESULTS

Five studies were included, with four assessed as having a high risk of bias. The evidence indicates that patients receiving treatment with olanzapine or fluoxetine tend to stay in treatment programmes for longer. Olanzapine showed favourable results (one study) in terms of weight gain, but did not show the same results in psychopathology, where the evidence is contradictory.

CONCLUSIONS

In accordance with previous reviews, our work allows us to conclude that there is contradictory information on the efficacy of psychotropic drugs in the treatment of anorexia nervosa. Future work should focus on developing clinical trials of high methodological quality.

Gender Differences in Treatment Outcomes for Eating Disorders: A Case-Matched, Retrospective Pre–Post Comparison

Eating disorders (EDs) are increasingly emerging as a health risk in men, yet men remain underrepresented in ED research, including interventional trials. This underrepresentation of men may have facilitated the development of women-centered ED treatments that result in suboptimal outcomes for men. The present study retrospectively compared pre- vs. post-treatment outcomes between age-, diagnosis-, and length-of-treatment-matched samples of n = 200 men and n = 200 women with Anorexia Nervosa (AN), Bulimia Nervosa (BN), Binge Eating Disorder (BED), or Eating Disorder Not Otherwise Specified (EDNOS), treated in the same setting during the same period, and using the same measurements. Compared to women, men with AN showed marked improvements in weight gains during treatment as well as in ED-specific cognitions and general psychopathology. Likewise, men with BED showed marked weight loss during treatment compared to women with BED; ED-specific cognitions and general psychopathology outcomes were comparable in this case. For BN and EDNOS, weight, ED-specific cognitions, and general psychopathology outcomes remained largely comparable between men and women. Implications for treatments are discussed.

Rapid refeeding in anorexia nervosa: A dialectic balance

OBJECTIVE

To examine the impact of our new rapid refeeding protocol on patients with anorexia nervosa (AN) in our Eating Disorders Program. We hypothesize that the new protocol would lead to a more rapid weight gain and a shorter length of stay, with no effect on medical complications or program completion.

METHOD

This cohort design included consecutive inpatients and day hospital patients admitted to the program with a BMI <18 kg/m² and a diagnosis of AN between 2007 and 2020; N = 326 patients. Main outcomes measured were rate of weight gain and length of stay. Safety indicators included electrolyte disturbances and supplementation required, complications including refeeding syndrome and completion of the program. A p value <.05 was considered statistically significant.

RESULTS

Total length of stay was 21 days shorter for patients on the rapid refeeding protocol compared to the traditional refeeding protocol. Patients on the new protocol gained 0.21 more kg/week compared to patients on the old protocol. There was no difference in completion rates between programs. Electrolyte imbalances were mild to moderate and easily treated with oral electrolyte supplementation. There were no deaths or cases of refeeding syndrome with either protocol.

DISCUSSION

This is the first Canadian study to assess the effectiveness and safety of rapid refeeding in an adult population. Rapid refeeding protocols can be safely administered and are cost effective. Shorter hospital admissions are desirable to minimize possible regression and dependency on inpatient services and positively impacts patients' quality of life.

PUBLIC SIGNIFICANCE

This study advances the idea that rapid refeeding in patients with anorexia nervosa can be administered safely and effectively with close medical monitoring. In addition, rapid refeeding leads to shorter hospital stays, with a cost-savings to the health system. Shorter admissions are desirable to minimize possible regression and dependency on inpatient services and also positively impacts patients' quality of life.

Psychosocial etiology of maladaptive exercise and its role in eating disorders: A systematic review

OBJECTIVE

Although maladaptive exercise (ME) is widely recognized as a clinical feature in transdiagnostic eating disorders, less is known about psychosocial factors that give rise to and perpetuate this behavior. This systematic review aimed to examine the empirical status of this association.

METHOD

We reviewed 46 full text articles examining longitudinal associations between psychosocial variables and ME.

RESULTS

Eighteen studies met full inclusion criteria. Based on our qualitative synthesis, evidence suggests reasonably consistent associations between early concern with weight and shape, and negative affect on later development of ME.

DISCUSSION

Inconsistent and insufficient assessment of ME across a majority of studies underscores caution in interpretation of results, but guides important discussion for future clinical and research efforts.

The intestinal microbiota and anorexia nervosa: cause or consequence of nutrient deprivation

The intestinal microbiota is a diverse microbial community that colonizes the gastrointestinal tract of animals. Abnormal changes in intestinal microbiota has been associated with multiple diseases including inflammatory bowel diseases and obesity; however, emerging evidence suggests a role for the gut microbiota in anxiety and depression via the gut-brain axis. As this microbial community is associated with weight dysregulation and host behavior it is not surprising that the intestinal microbiota may have a role to play in anorexia nervosa (AN). In this review we examine recent studies linking the gut microbiota with nutrition, psychopathology, and ultimately AN. We also review potential gut microbiota-based therapies for AN.

Short-Term Outcome of Inpatient Treatment for Adolescents with Anorexia Nervosa Using DSM-5 Remission Criteria

This study evaluated the short-term outcome of a multimodal inpatient treatment concept for adolescents with anorexia nervosa (AN). In this prospective observational study, a cohort of 126 female adolescents with AN (age range: 11–17, mean age: 14.83) was longitudinally followed from admission to discharge (average duration of stay: 77 days). We used gold-standard clinical interviews and self-report data, as well as DSM-5 remission criteria, to evaluate the treatment outcome. From admission to discharge, body-mass-index (BMI) significantly improved by 2.6 kg/m². Data from clinical interviews and self-reports yielded similar improvements in restraint eating and eating concerns (large effects). Lower effects were observed for variables assessing weight/shape concerns and drive for thinness. At discharge, 23.2% of patients showed full remission of AN, 31.3% partial remission, and 45.5% no remission according to DSM-5 criteria. Differences in remission groups were found regarding AN severity, age at admission, and use of antidepressant medication. Living with both parents, longer duration of inpatient treatment and the use of antipsychotic medication were significantly associated with higher BMI change. The findings provide evidence for the short-term effectiveness of our inpatient treatment concept. We recommend using DSM-5 based remission criteria to evaluate the treatment outcome to improve the comparability of studies.

The Maudsley Anorexia Nervosa Treatment for Adults (MANTRA): a feasibility case series of an integrated group based approach

BACKGROUND

Individuals with Anorexia Nervosa (AN) typically struggle in social and emotional contexts. An Integrated Group Based approach for the delivery of MANTRA - The Maudsley Anorexia Nervosa Treatment for Adults - extends current NICE recommended therapy by augmenting treatment with opportunities for experiential practice in a group context. A feasibility case series, delivered across three NHS community services is presented.

METHODS

The design was a case series of four Integrated Group MANTRA treatments delivered across three NHS sites (N = 29). Feasibility data of: retention, acceptability and effectiveness; alongside the qualitative capture of participant experiences of treatment is presented.

RESULTS

Primary outcomes suggest treatment acceptability. Participants committed to treatment with only 2 dropouts. There was significant change with medium effect sizes for eating disorder cognitions and symptoms (as measured by the global score on EDEQ) and BMI. Core themes emerging from qualitative analysis captured the value of the relational aspect of the treatment, the incorporation of experiential methods, and the opportunity to draw on the support of the group members to reduce shame and stigma.

CONCLUSIONS

An Integrated Group based MANTRA approach is a feasible and effective alternative intervention for community Eating Disorder services.

Efficacy and Safety of Antipsychotics and Antidepressants in the Treatment of Anorexia Nervosa: a Systematic Review

INTRODUCTION

The recommendations of the current guidelines are based on low quality evidence. Periodic updating is required, taking recent evidence into consideration.

OBJECTIVE

To synthesise the best available clinical evidence on the efficacy and safety of second-generation antidepressants and antipsychotics in patients with anorexia nervosa.

METHODS

Systematic review (CRD42020150577). We searched PubMed, SCOPUS, Ovid(Cochrane), EMBASE and LILACS for randomised clinical trials performed in patients with anorexia nervosa that evaluated the use of second-generation antipsychotics or oral antidepressants, at any dose and for any length of time, in outpatient and/or hospital treatment, taking weight (body mass index), psychopathological entities and safety as results.

RESULTS

Five studies were included, with four assessed as having a high risk of bias. The evidence indicates that patients receiving treatment with olanzapine or fluoxetine tend to stay in treatment programmes for longer. Olanzapine showed favourable results (one study) in terms of weight gain, but did not show the same results in psychopathology, where the evidence is contradictory.

CONCLUSIONS

In accordance with previous reviews, our work allows us to conclude that there is contradictory information on the efficacy of psychotropic drugs in the treatment of anorexia nervosa. Future work should focus on developing clinical trials of high methodological quality.

Effectiveness of treatment for adolescents and adults with anorexia nervosa in a routine residential setting

Residential treatment is a necessary element of treatment in some cases of anorexia nervosa, where it is used prior to transitioning to complete the treatment in a less intensive setting. This study tests how effective residential treatment is at helping adolescent and adult patients to reduce their eating pathology to levels that can be managed in outpatient settings. Ninety-eight patients with anorexia nervosa started treatment in a routine residential setting (83 completers). The adolescent and adult groups showed comparable levels of benefit, showing gains in weight and reductions in eating pathology, compatible with transitioning to less intensive treatment. Change was particularly substantial over the first 6 weeks. This effectiveness study has shown that an appropriate period of residential treatment can be used to prepare patients to be able to benefit from a less intensive treatment, regardless of age group.

Personalized networks of eating disorder symptoms predicting eating disorder outcomes and remission

Enhanced cognitive-behavioral therapy (CBT-E) is one of the primary evidence-based treatments for adults with eating disorders (EDs). However, up to 50% of individuals do not respond to CBT-E, likely because of the high heterogeneity present even within similar diagnoses. This high heterogeneity, especially in regard to presenting pathology, makes it difficult to develop a treatment based "on averages" and for clinicians to accurately pinpoint which symptoms should be targeted in treatment. As such, new models based at both the group, and individual level, are needed to more accurately refine targets for personalized evidence-based treatments that can lead to full remission. The current study (Expected N = 120 anorexia nervosa, atypical anorexia nervosa, and bulimia nervosa) will build both group and individual longitudinal models of ED behaviors, cognitions, affect, and physiology. We will collect data for 30 days utilizing a mobile application to assess behaviors, cognition, and affect and a sensor wristband that assesses physiology (heart rate, acceleration). We will also collect outcome data at 1- and 6-month follow-ups to assess ED outcomes and remission status. These data will allow for identification of "on average" and "individual" targets that maintain ED pathology and test if these targets predict outcomes, including ED remission.

Reduced Environmental Stimulation in Anorexia Nervosa: An Early-Phase Clinical Trial

Reduced Environmental Stimulation Therapy (REST) alters the balance of sensory input to the nervous system by systematically attenuating sensory signals from visual, auditory, thermal, tactile, vestibular, and proprioceptive channels. Previous research from our group has shown that REST via floatation acutely reduces anxiety and blood pressure (BP) while simultaneously heightening interoceptive awareness in clinically anxious populations. Anorexia nervosa (AN) is an eating disorder characterized by elevated anxiety, distorted body representation, and abnormal interoception, raising the question of whether REST might positively impact these symptoms. However, this approach has never been studied in eating disorders, and it is unknown whether exposure to floatation REST might worsen AN symptoms. To examine these possibilities, we conducted an open-label study to investigate the safety and tolerability of REST in AN. We also explored the acute impact of REST on BP, affective symptoms, body image disturbance, and interoception. Twenty-one partially weight-restored AN outpatients completed a protocol involving four sequential sessions of REST: reclining in a zero-gravity chair, floating in an open pool, and two sessions of floating in an enclosed pool. All sessions were 90 min, approximately 1 week apart. We measured orthostatic BP before and immediately after each session (primary outcome), in addition to collecting BP readings every 10 min during the session using a wireless waterproof system as a secondary outcome measure. Each participant's affective state, awareness of interoceptive sensations, and body image were assessed before and after every session (exploratory outcomes). There was no evidence of orthostatic hypotension following floating, and no adverse events (primary outcome). Secondary analyses revealed that REST induced statistically significant reductions in BP (p < 0.001; Cohen's d, 0.2-0.5), anxiety (p < 0.001; Cohen's d, >1) and negative affect (p < 0.01; Cohen's d, >0.5), heightened awareness of cardiorespiratory (p < 0.01; Cohen's d, 0.2-0.5) but not gastrointestinal sensations, and reduced body image dissatisfaction (p < 0.001; Cohen's d, >0.5). The findings from this initial trial suggest that individuals with AN can safely tolerate the physical effects of REST via floatation. Future randomized controlled trials will need to investigate whether these initial observations of improved anxiety, interoception, and body image disturbance occur in acutely ill AN populations.

Clinical Trial Registration

ClinicalTrials.gov; Identifier: NCT02801084 (April 01, 2016).

Effects associated with the use of healthcare for eating disorders by women in the community: a longitudinal cohort study

OBJECTIVES

This study examined formal and informal healthcare use (HCU) in community women with disordered eating, and associations of HCU with mental health-related quality of life (MHRQoL), psychological distress, mental health literacy (MHL) and eating disorder (ED) symptoms over time.

HYPOTHESIS

We hypothesised that HCU would lead to improvement in ED symptom severity, MHRQoL, MHL and psychological distress.

DESIGN, SETTING, PARTICIPANTS

Data were from years 2, 4 and 9 of a longitudinal cohort of 443 community women (mean age 30.6, SE 0.4 years) with a range of ED symptoms, randomly recruited from the Australian Capital Territory electoral role or via convenience sampling from tertiary education centres. Data were collected using posted/emailed self-report questionnaires; inclusion criteria were completion of the HCU questionnaire at time point of 2 years (baseline for this study). HCU was measured using a multiple-choice question on help seeking for an eating problem. To test the effect of HCU over time on MHRQoL (Short Form-12 score), psychological distress (Kessler Psychological Distress Scale score), ED symptom severity (Eating Disorder Examination Questionnaire score) and ED-MHL, linear or logistic mixed-effects regression analyses were used.

RESULTS

20% of participants sought ED-specific help at baseline; more than half of participants sought help that was not evidence based. HCU at baseline was significantly associated with improved MHRQoL and ED symptom severity and decreased psychological distress over time (Cohen's d all >0.3, ie, small). HCU was not significantly associated with MHL over time. The predictive ability of the fitted models ranged from 32.18% to 42.42% for psychological distress and MHL treatment, respectively.

CONCLUSIONS

Formal and informal HCU were associated with small improvements in ED symptoms, MHRQoL and psychological distress but not with improved MHL. Informal services in ED management should be investigated further along with efforts to improve ED-MHL.

Pharmacological treatment of acute-phase anorexia nervosa: Evidence from randomized controlled trials

BACKGROUND

Anorexia nervosa (AN) is the psychiatric disorder with the highest mortality rate, with a standard mortality ratio of 5.86. Despite the large use of psychotropic drugs in the clinical setting, Food and Drug Administration has not approved any psychoactive treatment for AN.

AIMS

The aim of this study was to perform an updated systematic review and meta-analysis of published randomized controlled trials (RCTs) investigating psychopharmacological treatment in acute-phase AN.

METHODS

The present paper follows the preferred reporting items for systematic reviews and meta-analyses (PRISMA) statement. An extensive literature search was performed. All RCTs enrolling patients with acute-phase AN, comparing at least one psychotropic drug with another drug, placebo, treatment-as-usual or no treatment were included. The main outcome was the effect of psychoactive drugs on body mass index (BMI); data on psychopathological outcomes were also collected when available.

RESULTS

A total of 19 RCTs met all specified criteria. Of these, 11 were excluded from quantitative analyses. Of the eight studies included in the meta-analyses, five reported data on BMI, showing no significant difference between olanzapine and placebo for weight recovery. No significant result was found for AN psychopathology, depressive and anxious symptoms for any of the molecules studied.

CONCLUSIONS

RCTs published in this field display methodological biases, low sample sizes and short follow-up periods. Further research efforts are needed in this field as no evidence has been demonstrated for the use of any psychotropic drug in acute-phase AN neither for weight recovery, nor for comorbid psychiatric symptoms.

Mental health dished up-the use of iPSC models in neuropsychiatric research

Genetic and molecular mechanisms that play a causal role in mental illnesses are challenging to elucidate, particularly as there is a lack of relevant in vitro and in vivo models. However, the advent of induced pluripotent stem cell (iPSC) technology has provided researchers with a novel toolbox. We conducted a systematic review using the PRISMA statement. A PubMed and Web of Science online search was performed (studies published between 2006–2020) using the following search strategy: hiPSC OR iPSC OR iPS OR stem cells AND schizophrenia disorder OR personality disorder OR antisocial personality disorder OR psychopathy OR bipolar disorder OR major depressive disorder OR obsessive compulsive disorder OR anxiety disorder OR substance use disorder OR alcohol use disorder OR nicotine use disorder OR opioid use disorder OR eating disorder OR anorexia nervosa OR attention-deficit/hyperactivity disorder OR gaming disorder. Using the above search criteria, a total of 3515 studies were found. After screening, a final total of 56 studies were deemed eligible for inclusion in our study. Using iPSC technology, psychiatric disease can be studied in the context of a patient’s own unique genetic background. This has allowed great strides to be made into uncovering the etiology of psychiatric disease, as well as providing a unique paradigm for drug testing. However, there is a lack of data for certain psychiatric disorders and several limitations to present iPSC-based studies, leading us to discuss how this field may progress in the next years to increase its utility in the battle to understand psychiatric disease.

Epigenetic regulation of the cannabinoid receptor CB1 in an activity-based rat model of anorexia nervosa

OBJECTIVE

Both environmental and genetic factors are known to contribute to the development of anorexia nervosa (AN), but the exact etiology remains poorly understood. Herein, we studied the transcriptional regulation of the endocannabinoid system, an interesting target for body weight maintenance and the control of food intake and energy balance.

METHOD

We used two well-characterized animal models of AN: (a) the activity-based anorexia (ABA) model in which rats, housed with running wheels and subjected to daily food restriction, show reductions in body weight and increase in physical activity; (b) the genetic anx/anx mouse displaying the core features of AN: low food intake and emaciation.

RESULTS

Among the evaluated endocannabinoid system components, we observed a selective and significant down-regulation of the gene encoding for the type 1 cannabinoid receptor (Cnr1) in ABA rats' hypothalamus and nucleus accumbens and, in the latter area, a consistent, significant and correlated increase in DNA methylation at the gene promoter. No changes were evident in the anx/anx mice except for a down-regulation of Cnr1, in the prefrontal cortex.

DISCUSSION

Our findings support a possible role for Cnr1 in the ABA animal model of AN. In particular, its regulation in the nucleus accumbens appears to be triggered by environmental cues due to the consistent epigenetic modulation of the promoter. These data warrant further studies on Cnr1 regulation as a possible target for treatment of AN.

The Explanation of Eating Disorders: A Critical Analysis

Eating disorders (EDs) are one of the most severe and complex mental health problems facing researchers and clinicians today. The effective prevention and treatment of these conditions is therefore of paramount importance. However, at present our treatments fall short: generally demonstrating only poor to moderate efficacy, and often completely ineffective for severe or chronic cases. A possible reason for this is that the current theories underlying these treatments are flawed. In this paper, we review and evaluate several prominent theoretical explanations associated with current frontline and promising treatments for ED. In doing so, we identify fundamental problems within the construction of current ED explanations and their implications for treatment. In response to these findings, we propose several strategies for the construction of future ED explanations which we believe have the power to ameliorate these problems and potentially help to develop more efficacious treatment downstream.

Feeding and eating disorders

Eating disorders (EDs) are a group of prevalent psychiatric illnesses with an onset in early to late adolescence-a time of significant neural development, physical and psychologic growth, and self-exploration. The etiology and neurobiology of EDs are not well understood, but EDs are recognized as brain-based illnesses with serious acute and long-term consequences if undertreated or ignored. Two EDs, anorexia nervosa (AN) and bulimia nervosa (BN), have historically been the primary EDs of focus. The DSM-5 updated diagnostic criteria for these disorders added two more: binge-eating disorder (BED) and avoidant/restrictive food intake disorder (ARFID). EDs severely impact males as well as females across the weight spectrum. Comorbidity is high; mortality rates for AN and BN are the highest in psychiatric conditions and higher than many medical conditions. Several treatment options are available to treat an ED ranging from inpatient hospitalization to outpatient services and different psychotherapy options. This chapter reviews the diagnostic criteria, clinical presentation, and treatment for these disorders. Where available, sex differences and developmental considerations will be noted. For all EDs, early recognition and swift treatment are necessary to avoid a chronic course.

Eating Disorders on College Campuses in the United States: Current Insight on Screening, Prevention, and Treatment

BACKGROUND

Eating disorders are prevalent on college campuses and pose significant risks to student health, well-being, and academic performance. However, few students receive access to evidence-based prevention and treatment.

OBJECTIVE

The present review synthesizes the recent literature on ED screening, prevention, and treatment approaches on college campuses in the United States. We provide an overview of ED screening efforts on college campuses, including relevant screening tools, summarize the extant literature on prevention programming, as well psychological and pharmacological treatment approaches, and outline limitations of current programming and provide future directions for research.

CONCLUSION

Recent advances in ED screening, prevention, and treatment efforts highlight the importance of early detection and intervention. Innovative approaches to screening and dissemination of evidence-based prevention and treatment programs on college campuses are warranted. Implications for future research are discussed.

Updates on Treatments for Adolescent Anorexia Nervosa

This article provides background information, descriptions, and evidential support for the more recent treatments for adolescents with anorexia nervosa, including family-based treatment, adolescent focused therapy, cognitive behavioral therapy, systemic family therapy, and psychopharmacologic treatments. At this time, family-based treatment has the best evidence of efficacy and cost-effectiveness. Future directions in treatment research for adolescent anorexia nervosa are discussed.

A Randomized Placebo-Controlled Trial of Low-Dose Testosterone Therapy in Women With Anorexia Nervosa

CONTEXT

Anorexia nervosa (AN) is a psychiatric illness with considerable morbidity and no approved medical therapies. We have shown that relative androgen deficiency in AN is associated with greater depression and anxiety symptom severity.

OBJECTIVE

To determine whether low-dose testosterone therapy is an effective endocrine-targeted therapy for AN.

DESIGN

Double-blind, randomized, placebo-controlled trial.

SETTING

Clinical research center.

PARTICIPANTS

Ninety women, 18 to 45 years, with AN and free testosterone levels below the median for healthy women.

INTERVENTION

Transdermal testosterone, 300 μg daily, or placebo patch for 24 weeks.

MAIN OUTCOME MEASURES

Primary end point: body mass index (BMI). Secondary end points: depression symptom severity [Hamilton Depression Rating Scale (HAM-D)], anxiety symptom severity [Hamilton Anxiety Rating Scale (HAM-A)], and eating disorder psychopathology and behaviors.

RESULTS

Mean BMI increased by 0.0 ± 1.0 kg/m2 in the testosterone group and 0.5 ± 1.1 kg/m2 in the placebo group (P = 0.03) over 24 weeks. At 4 weeks, there was a trend toward a greater decrease in HAM-D score (P = 0.09) in the testosterone vs placebo group. At 24 weeks, mean HAM-D and HAM-A scores decreased similarly in both groups [HAM-D: -2.9 ± 4.9 (testosterone) vs -3.0 ± 5.0 (placebo), P = 0.72; HAM-A: -4.5 ± 5.3 (testosterone) vs -4.3 ± 4.4 (placebo), P = 0.25]. There were no significant differences in eating disorder scores between groups. Testosterone therapy was safe and well tolerated with no increase in androgenic side effects compared with placebo.

CONCLUSION

Low-dose testosterone therapy for 24 weeks was associated with less weight gain-and did not lead to sustained improvements in depression, anxiety, or disordered eating symptoms-compared with placebo in women with AN.

"As long as they eat"? Therapist experiences, dilemmas and identity negotiations of Maudsley and family-based therapy for anorexia nervosa

BACKGROUND

Maudsley Family Therapy and its manualised version Family-Based Therapy for Anorexia Nervosa (FBT-AN) have accrued the most significant research evidence-base for the treatment of adolescent Anorexia Nervosa (AN). A tradition of seeking augmentations for this treatment has also been established to enhance efficacy. There exists, however, a gap in the uptake of this form of manualised treatment into the "real world" of clinicians who work with adolescent AN.

AIMS

This research study investigated the key experiences and identity negotiations of a group of nine Australian clinicians who were interested in contributing to research into ways that Maudsley and FBT-AN might be improved.

METHODS

Nine clinicians, who at the time of the interview practised or had previously practised, FBT-AN participated in a semi-structured interview. A critical discursive analysis of interview transcripts generated a thematic map of these therapists' experiences and identity negotiations in their practice of FBT-AN.

RESULTS

These therapists experienced the structure of FBT-AN as both a secure map for therapy, yet also constraining at times, in their work with adolescents and their families. Additionally, their professional identities were both invested and troubled by the identity position of themselves as evidence-based practitioners, particularly where evidence-based practice (EBP) meant strict fidelity to the manual and restrained them from tailoring a broader range of therapeutic interventions to an individual adolescent and their family. Within their narratives, these therapists refashioned alternative identity positions around what it meant to be an evidence-based practitioner through listening to and drawing on their clinical expertise of what works in therapeutic practice with an individual adolescent and their family.

CONCLUSIONS

These therapists narratives highlight the power of the dominant discourse of EBP that works to privilege the research evidence over other forms of evidence that include clinician expertise and client preferences. The dilemmas faced by these therapists questioned not only the strict application of FBT-AN for adolescent AN across diverse therapeutic contexts, but also the effects of supervisory practices that paralleled this strict fidelity to the model. Further research is needed into therapeutic interventions and supervisory practices that give greater scope for clinicians to draw on their expertise in the flexible tailoring of treatments to the unique needs and preferences of the individual adolescent and their family.

Increased lipid and lipoprotein concentrations in anorexia nervosa: A systematic review and meta-analysis

OBJECTIVE

Alterations in blood lipid concentrations in anorexia nervosa (AN) have been reported; however, the extent, mechanism, and normalization with weight restoration remain unknown. We conducted a systematic review and a meta-analysis to evaluate changes in lipid concentrations in acutely-ill AN patients compared with healthy controls (HC) and to examine the effect of partial weight restoration.

METHOD

A systematic literature review and meta-analysis (PROSPERO: CRD42017078014) were conducted for original peer-reviewed articles.

RESULTS

Forty-eight studies were eligible for review; 33 for meta-analyses calculating mean differences (MD). Total cholesterol (MD = 22.7 mg/dL, 95% CI = 12.5, 33.0), high-density lipoprotein (HDL; MD = 3.4 mg/dL, CI = 0.3, 7.0), low-density lipoprotein (LDL; MD = 12.2 mg/dL, CI = 4.4, 20.1), triglycerides (TG; MD = 8.1 mg/dL, CI = 1.7, 14.5), and apolipoprotein B (Apo B; MD = 11.8 mg/dL, CI = 2.3, 21.2) were significantly higher in acutely-ill AN than HC. Partially weight-restored AN patients had higher total cholesterol (MD = 14.8 mg/dL, CI = 2.1, 27.5) and LDL (MD = 16.1 mg/dL, CI = 2.3, 30.0). Pre- versus post-weight restoration differences in lipid concentrations did not differ significantly.

DISCUSSION

We report aggregate evidence for elevated lipid concentrations in acutely-ill AN patients compared with HC, some of which persist after partial weight restoration. This could signal an underlying adaptation or dysregulation not fully reversed by weight restoration. Although concentrations differed between AN and HC, most lipid concentrations remained within the reference range and meta-analyses were limited by the number of available studies.

Family therapy approaches for anorexia nervosa

BACKGROUND

Anorexia nervosa (AN) is characterised by a failure to maintain a normal body weight due to a paucity of nutrition, an intense fear of gaining weight or behaviour that prevents the individual from gaining weight, or both. The long-term prognosis is often poor, with severe developmental, medical and psychosocial complications, high rates of relapse and mortality. 'Family therapy approaches' indicate a range of approaches, derived from different theories, that involve the family in treatment. We have included therapies developed on the basis of dominant family systems theories, approaches that are based on or broadly similar to the family-based therapy derived from the Maudsley model, approaches that incorporate a focus on cognitive restructuring, as well as approaches that involve the family without articulation of a theoretical approach.This is an update of a Cochrane Review first published in 2010.

OBJECTIVES

To evaluate the efficacy of family therapy approaches compared with standard treatment and other treatments for AN.

SEARCH METHODS

We searched the Cochrane Common Mental Disorders Controlled Trials Register (CCMDCTR) and PsycINFO (OVID) (all years to April 2016). We ran additional searches directly on Cochrane Central Register for Controlled Trials (CENTRAL), MEDLINE, Ovid Embase, and PsycINFO (to 2008 and 2016 to 2018). We searched the World Health Organization (WHO) trials portal (ICTRP) and ClinicalTrials.gov, together with four theses databases (all years to 2018). We checked the reference lists of all included studies and relevant systematic reviews. We have included in the analyses only studies from searches conducted to April 2016.

SELECTION CRITERIA

Randomised controlled trials (RCTs) of family therapy approaches compared to any other intervention or other types of family therapy approaches were eligible for inclusion. We included participants of any age or gender with a primary clinical diagnosis of anorexia nervosa.

DATA COLLECTION AND ANALYSIS

Four review authors selected the studies, assessed quality and extracted data. We used a random-effects meta-analysis. We used the risk ratio (with a 95% confidence interval) to summarise dichotomous outcomes and both the standardised mean difference and the mean difference to summarise continuous measures.

MAIN RESULTS

We included 25 trials in this version of the review (13 from the original 2010 review and 12 newly-included studies). Sixteen trials were of adolescents, eight trials of adults (seven of these in young adults aged up to 26 years) and one trial included three age groups: one adolescent, one young adult and one adult. Most investigated family-based therapy or variants. Reporting of trial conduct was generally inadequate, so that in a large number of studies we rated the risk of bias as unclear for many of the domains. Selective reporting bias was particularly problematic, with 68% of studies rated at high risk of bias in this area, followed by incomplete outcome data, with 44% of studies rated at high risk of bias in this area. For the main outcome measure of remission there was some low-quality evidence (from only two studies, 81 participants) suggesting that family therapy approaches might offer some advantage over treatment as usual on rates of remission, post intervention (risk ratio (RR) 3.50, 95% confidence interval (CI) 1.49 to 8.23; I² = 0%). However, at follow-up, low-quality evidence from only one study suggested this effect was not maintained. There was very low-quality evidence from only one trial, which means it is difficult to determine whether family therapy approaches offer any advantage over educational interventions for remission (RR 9.00, 95% CI 0.53 to 153.79; 1 study, N = 30). Similarly, there was very low-quality evidence from only five trials for remission post-intervention, again meaning that it is difficult to determine whether there is any advantage of family therapy approaches over psychological interventions (RR 1.22, 95% CI 0.89 to 1.67; participants = 252; studies = 5; I² = 37%) and at long-term follow-up (RR 1.08, 95% CI 0.91 to 1.28; participants = 200; studies = 4 with 1 of these contributing 3 pairwise comparisons for different age groups; I² = 0%). There was no indication that the age group had any impact on the overall treatment effect; however, it should be noted that there were very few trials undertaken in adults, with the age range of adult studies included in this analysis from 20 to 27. There was some evidence of a small effect favouring family based therapy compared with other psychological interventions in terms of weight gain post-intervention (standardised mean difference (SMD) 0.32, 95% CI 0.01 to 0.63; participants = 210; studies = 4 with 1 of these contributing 3 pairwise comparisons for different age groups; I² = 11%) . Overall, there was insufficient evidence to determine whether there were any differences between groups across all comparisons for most of the secondary outcomes (weight, eating disorder psychopathology, dropouts, relapse, or family functioning measures), either at post-intervention or at follow-up.

AUTHORS' CONCLUSIONS

There is a limited amount of low-quality evidence to suggest that family therapy approaches may be effective compared to treatment as usual in the short term. This finding is based on two trials that included only a small number of participants, and both had issues about potential bias. There is insufficient evidence to determine whether there is an advantage of family therapy approaches in people of any age compared to educational interventions (one study, very low quality) or other psychological therapies (five studies, very low quality). Most studies contributing to this finding were undertaken in adolescents and youth. There are clear potential impacts on how family therapy approaches might be delivered to different age groups and further work is required to understand what the resulting effects on treatment efficacy might be. There is insufficient evidence to determine whether one type of family therapy approach is more effective than another. The field would benefit from further large, well-conducted trials.

Pre-treatment patient characteristics as predictors of drop-out and treatment outcome in individual and family therapy for adolescents and adults with anorexia nervosa: A systematic review and meta-analysis

Understanding variables predicting drop-out or unfavourable outcome following treatment for anorexia nervosa (AN) may help to improve upon intervention efforts. However, the current literature has demonstrated sparse and inconsistent significant findings. The current systematic review and meta-analysis summarised the evidence base examining baseline predictors of drop-out and outcome in AN treatment. A literature search was conducted to identify research investigating predictors of drop-out and outcome in individuals treated for AN. Four online databases were searched, and predictors were organised by category and dependent variable (outcome versus drop-out). 27 studies were included. Lower motivation, lower BMI, and having the binge-purge subtype of AN predicted drop-out. Greater ED pathology and poorer motivation predicted poorer outcome. Clinical recommendations include taking particular care during assessment stages to identify patients at risk of drop-out and/or poor outcome based on their clinical profile and level of motivation for recovery. At-risk patients should be receiving tailored treatment to enhance engagement and reduce risk of drop-out. In conclusion, there's some evidence that motivation, BMI, subtype, and ED pathology predicts drop-out and/or outcome in individual and family-based therapy for AN amongst adolescents and adults; however, research incorporating carefully designed multi-site studies is required to further examine these findings.

[E-Therapies for Anorexia Nervosa, Bulimia Nervosa and Binge Eating Disorder]

E-Therapies for Anorexia Nervosa, Bulimia Nervosa and Binge Eating Disorder Abstract. Eating disorders can often be treated with psychotherapy, but mostly due to a lack of trained clinicians, the majority of the persons concerned do not receive any treatment. In recent years, internet-based psychotherapy (e-therapy) was proposed and tested in several pilot projects as a novel possibility to offer a larger number of places on a treatment program with a constant number of available clinicians. Recent results are promising, but before an implementation into standard care can take place, more detailed knowledge must be provided as to which patients may be recommended this type of therapy as an equivalent alternative to traditional face-to-face therapy.

The gut microbiome in anorexia nervosa: relevance for nutritional rehabilitation

Rapidly accumulating evidence supports the important role of gut microbiome in the regulation of mood, behaviour, appetite, gastrointestinal symptomology, and nutrient metabolism. These are all core features frequently altered in individuals with anorexia nervosa (AN). Current treatment recommendations for AN support the use of high-calorie diets as an essential part of nutritional rehabilitation, commonly achieved by elevating the fat content of the diet. However, in contrast to this approach, there is accumulating evidence suggesting the importance of balanced, high-fibre diets on the gut microbiome. Studies have demonstrated profound differences in the microbial composition of underweight people with AN and those of normal- or overweight individuals. Specific alterations vary widely between studies. It is thus far unclear to what extent the observed differences are brought on by iatrogenic effects of nutritional rehabilitation or the disorder itself. To date, only two studies have investigated the changes in the intestinal microbiota during nutritional rehabilitation and corresponding weight restoration. These studies suggest that the gut microbiome of AN patients was different to healthy controls both prior and following nutritional rehabilitation, though it is noted that these states were associated with lower and higher nutritional intakes, respectively. There is a clear need for further investigation regarding the effects of nutritional rehabilitation on the gut microbiome. Such research would provide insights into the potential role of gut microbiome in modulating the pathophysiology of AN and inform future treatment strategies.