Le numéro de septembre 2022 de la revue European Eating Disorders Review est consacré au TSA et aux troubles alimentaires.

1. Tchanturia K. What we can do about Autism and Eating Disorder comorbidity. Eur Eat Disord Rev;2022 (Sep);30(5):437-441.

OBJECTIVE: We are pleased to introduce this special issue about Autism and Feeding and Eating Disorders, representing reflections on this complex comorbidity. METHOD: Contributions focussed on several main themes: (1) the definition and assessment of autism and eating disorder (ED) comorbidity; (2) the brain imaging findings of similarities and differences between autism and EDs; (3) sensory systems and interoception; (4) comorbidity across the age spectrum and (5) improving treatment outcomes in ED and autism comorbidity. RESULTS: The papers in this issue highlight the importance of research, screening and practical adaptations in the field of ED and autism comorbidity. Autism is a neurodevelopmental condition with several strengths and weaknesses. When patients present with this comorbidity, it is important that their ED is treated which requires careful adaptation and tailoring for people with autism. DISCUSSION: This special issue is an attempt to facilitate further research and stimulate collaborations between all of the stakeholders, particularly clinicians who have expertise in autism and clinicians working in the field of ED. We have included diverse themes from international researchers conducting qualitative and quantitative studies, providing research evidence to inform treatment modifications for this complex comorbidity.

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2. Zhang R, Birgegård A, Fundín B, Landén M, Thornton LM, Bulik CM, Dinkler L. Association of autism diagnosis and polygenic scores with eating disorder severity. Eur Eat Disord Rev;2022 (Sep);30(5):442-458.

Among individuals with eating disorders (ED), those with co-occurring autism are often considered to have more severe presentations and poorer prognosis. However, previous findings have been contradictory and limited by small sample size and/or cross-sectional assessment of autistic traits. We examine the hypothesis that autism diagnosis and autism polygenic score (PGS) are associated with increased ED severity in a large ED cohort using a broad range of ED severity indicators. Our cohort included 3189 individuals (64 males) born 1977-2000 with current or previous anorexia nervosa who participated in the Anorexia Nervosa Genetics Initiative-Sweden (ANGI-SE) and for whom genotypes and linkage to national registers were available. We identified 134 (4.2%) individuals with registered autism diagnoses. Individuals with confirmed autism diagnosis had significantly more severe ED across three sets of severity indicators. Some of the largest effects were found for the proportion of individuals who attempted suicide and who received tube feeding (higher in autism), and for the time spent in inpatient care (longer in autism). Results for autism PGS were not statistically significant. Adapting ED treatment to the needs of individuals with co-occurring autism is an important research direction to improve treatment outcome in this group.

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3. Halls D, Leppanen J, Kerr-Gaffney J, Simic M, Nicholls D, Mandy W, Williams S, Tchanturia K. Examining the relationship between autistic spectrum disorder characteristics and structural brain differences seen in anorexia nervosa. Eur Eat Disord Rev;2022 (Sep);30(5):459-473.

Cortical differences have been reported in Anorexia Nervosa (AN) compared with healthy controls (HC); however, it is unclear if Autism Spectrum Disorder (ASD) characteristics are related to these cortical differences. The aim of this study was to examine if structural measures were correlated to ASD traits in AN. In total 184 female participants participated in the study; 57 acutely underweight AN participants (AAN), 59 weight-restored participants (WR) and 68 HC. Participants underwent structural magnetic resonance imaging as well as completing the Autism Diagnostic Observation schedule, second edition to examine ASD characteristics. Group differences in curvature, gyrification, surface area, thickness, global grey matter and white matter were measured. Correlation and regression analysis were conducted to examine the relationship between cortical measures and ASD characteristics. Two decreased gyrification clusters in the right post central and supramarginal gyrus and decreased global grey matter were observed in the AAN group compared to HC and WR. No correlations between ASD traits and structural measures existed. Our results suggest structural differences seen in individuals with AN do not appear to be related to ASD characteristics.

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4. Ghiotto C, Silva C, Charvin I, Atzori P, Givaudan M, Da Fonseca D, Bat-Pitault F. Comparing executive functions profiles in anorexia nervosa and autism spectrum disorder in adolescence. Eur Eat Disord Rev;2022 (Sep);30(5):474-485.

OBJECTIVE: Executive functions (EFs) inefficiencies in anorexia nervosa (AN), especially in set-shifting and central coherence, suggest a link between AN and autism spectrum disorders (ASDs). This study aimed at comparing EF profiles in AN and ASD, and investigating clinical variables associated with the identified EF difficulties. METHOD: One hundred and sixty-two adolescents with AN or ASD completed self-report questionnaires assessing depression, anxiety and autism symptoms. Parents completed the behaviour rating of executive functions parent-form (BRIEF-P). Besides comparing EFs in AN and ASD, we also analysed clinical variables scoring below and above the mean age score across the all sample. We additionally examined the relationship between clinical variables and the BRIEF-P indexes in AN. RESULTS: Participants with ASD had greater EF difficulties than participants with AN on all BRIEF-P scales. In the whole sample, higher autistic features were related to poorer EF. In AN, lower body mass index and particularly higher autism-spectrum quotient (BRI: Beta = 0.55; p < 0.001 and GEC: Beta = 0.50; p < 0.001) were most strongly associated with poorer EF. CONCLUSION: Although participants with ASD showed greater difficulties, autistic traits were related to alter EFs in AN. Exploring further this dimension can undeniably allow better adaptive cognitive remediation programs.

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5. Ruan VA, Hartz A, Hueck M, Dahmen B, von Polier G, Herpertz-Dahlmann B, Konrad K, Schulte-Rüther M, Seitz J. Neural mechanisms underlying social recognition and theory of mind in adolescent patients with bulimia nervosa and transdiagnostic comparison with anorexia nervosa. European Eating Disorders Review;2022;30(5):486-500.

Abstract Introduction Theory of mind (ToM) is important for social interactions and typical development and has been found to be impaired in patients with anorexia nervosa (AN) and bulimia nervosa (BN). Hypoactivation in frontotemporal brain regions seems to be the underlying neural mechanism in AN while whole-brain analyses in BN are lacking. Methods We used the well-validated social recognition task fMRI paradigm to assess ToM in a total of 72 female adolescents (16 BN, 18 AN and 38 matched healthy controls [HC]). Results Compared to HCBN, patients with BN showed hyperactivity during ToM-activity in the right frontal pole, middle temporal gyrus and left temporal pole and differed fundamentally from hypoactivation in these regions observed in patients with AN before and after short-term weight rehabilitation. Interaction and overlap analyses confirmed that similar regions were affected in opposite directions in both diseases. Hyperactivations in BN in the right middle temporal gyrus and right frontal pole were associated with clinical BN-severity markers binging and purging frequency. Discussion The hyperactivation in BN suggest different underlying neural mechanisms for ToM compared to AN. Hyperactivity might correspond to a different but also ineffective cognitive style in patients with BN when approaching social interactions. These important transdiagnostic differences are relevant for future brain-targeted therapeutic approaches.

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6. Adams KL, Murphy J, Catmur C, Bird G. The role of interoception in the overlap between eating disorders and autism: Methodological considerations. Eur Eat Disord Rev;2022 (Sep);30(5):501-509.

Significant comorbidity has been demonstrated between feeding and eating disorders and autism. Atypical interoception (perception of bodily signals) may, at least in part, be responsible for this association, as it has been implicated in the aetiology of both conditions. However, significant methodological limitations are impeding progress in this area. This paper provides a brief overview of how interoception has been linked to autism and feeding and eating disorders in both adolescent and adult populations before identifying several issues with current measures of interoception. We suggest that methodological issues may be contributing to the inconsistency in the empirical literature, and provide suggestions for future research.

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7. Schröder SS, Danner UN, Spek AA, van Elburg AA. Problematic eating behaviours of autistic women-A scoping review. Eur Eat Disord Rev;2022 (Sep);30(5):510-537.

AIM: Eating and feeding behaviours of autistic individuals and related consequences have been mainly investigated in autistic children or in autistic adults with intellectual disabilities. Behaviours such as food selectivity or food neophobia have been shown to persist into adolescence and adulthood and are associated with aversive consequences. However, much less is known about the eating behaviours of autistic adults without intellectual disabilities, especially those of women. By means of a scoping review, we aim to assess the extent of the scientific literature on what is known about the eating behaviours of these women and the possible consequences of such eating behaviour. METHOD: Medline, Cochrane, PubMed and PsycInfo databases were searched according to Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. RESULTS: Five studies met the eligibility criteria and were included in this review. Autistic women not only reported high levels of eating behaviour frequently seen in autism spectrum disorders (ASD), but also high levels of disordered eating behaviour, similar to that of women with eating disorders. CONCLUSIONS: Autistic women seem to exhibit high levels of eating behaviour frequently seen in ASD as well as disordered eating behaviour. Future research needs to shed light on what underlies these problematic eating behaviours, in order to help to adapt current treatment modalities to meet the unique needs of these women.

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8. Nimbley E, Golds L, Sharpe H, Gillespie-Smith K, Duffy F. Sensory processing and eating behaviours in autism: A systematic review. Eur Eat Disord Rev;2022 (Sep);30(5):538-559.

OBJECTIVES: The aim of this study was to assess the relationship between sensory processing and a broad range of eating behaviours across the lifespan. METHODS: Five electronic databases of published and unpublished quantitative studies were systematically searched, evaluated for risk of bias and synthesised according to identified eating outcomes. RESULTS: Across 25 studies, there was consistent evidence of a relationship between sensory processing and a range of eating behaviours. There was early evidence for the particular role of taste/smell sensitivities, as well as hypersensitivities, although future research is needed looking at different sensory patterns and modalities. There was also tentative evidence to suggest this relationship extends across development. DISCUSSION: Study findings are discussed in relation to implications for sensory-based eating and feeding interventions and the development of eating disorders. Methodological and conceptual limitations are discussed and suggestions for future research are made to address these limitations. A broader investigation of multi-sensory issues and clearly defined eating behaviours, including disordered eating in clinically diagnosed samples, will allow for a more comprehensive and robust understanding of the relationship between sensory processing and eating behaviours in autism.

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9. Sader M, Williams JHG, Waiter GD. A meta-analytic investigation of grey matter differences in anorexia nervosa and autism spectrum disorder. Eur Eat Disord Rev;2022 (Sep);30(5):560-579.

Recent research reports Anorexia Nervosa (AN) to be highly dependent upon neurobiological function. Some behaviours, particularly concerning food selectivity are found in populations with both Autism Spectrum Disorder (ASD) and AN, and there is a proportionally elevated number of anorexic patients exhibiting symptoms of ASD. We performed a systematic review of structural MRI literature with the aim of identifying common structural neural correlates common to both AN and ASD. Across 46 ASD publications, a meta-analysis of volumetric differences between ASD and healthy controls revealed no consistently affected brain regions. Meta-analysis of 23 AN publications revealed increased volume within the orbitofrontal cortex and medial temporal lobe, and adult-only AN literature revealed differences within the genu of the anterior cingulate cortex. The changes are consistent with alterations in flexible reward-related learning and episodic memory reported in neuropsychological studies. There was no structural overlap between ASD and AN. Findings suggest no consistent neuroanatomical abnormality associated with ASD, and evidence is lacking to suggest that reported behavioural similarities between those with AN and ASD are due to neuroanatomical structural similarities.

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10. Sedgewick F, Leppanen J, Austin A, Tchanturia K. Different pathways, same goals: A large-scale qualitative study of autistic and non-autistic patient-generated definitions of recovery from an eating disorder. Eur Eat Disord Rev;2022 (Sep);30(5):580-591.

BACKGROUND: Definitions of recovery from an eating disorder (ED) have generally been formulated around clinical conceptualisations, rather than based on the views of patients. This paper therefore asked those with lived experience of ED for their own definitions of recovery. METHOD: Data were collected as part of an online study looking at EDs, autism and relationships. About 173 participants identified as recovered from ED and gave free-response definitions of recovery. Responses were subject to thematic analysis. RESULTS: Seven major themes were identified: Weight restoration, lack of ED behaviours, thoughts and behaviours, cognitions, emotional responses, getting on with life, and ongoing challenges. CONCLUSIONS: Many definitions of recovery given by those who have lived experience of ED echoed those used by clinicians and researchers. There were also points of divergence around the ongoing challenges of recovery. Our findings highlight the need for continuing support post-weight restoration to facilitate the successful long-term recovery for those with ED.

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11. Adamson J, Brede J, Babb C, Serpell L, Jones CRG, Fox J, Mandy W. Towards identifying a method of screening for autism amongst women with restrictive eating disorders. Eur Eat Disord Rev;2022 (Sep);30(5):592-603.

OBJECTIVE: Up to 37% of patients with anorexia nervosa score above cut-off on autism screening measures. These individuals typically have poorer outcomes from standard eating disorder interventions and could therefore benefit from adaptations. Accurately identifying these individuals is important for improving autism referral processes and clinical pathway decisions. This study’s aim was to identify subscales of questionnaires measuring constructs associated with either autism or eating disorders that, when combined with traditional autism screening measures, would improve the ability to identify women with restrictive eating disorders who might benefit from a full autism assessment. METHOD: One hundred and sixty women with restrictive eating disorders, with (n = 42) or without (n = 118) an autism diagnosis completed a battery of questionnaires. Using conditional stepwise binary logistic regression, we attempted to improve the autism spectrum quotient 10 item’s (AQ-10) ability to discriminate between autistic and non-autistic women in a restrictive eating disorder sample. RESULTS: In a binary logistic regression model, the AQ-10 reliably discriminated between autistic and non-autistic women with an accuracy rate of 85% but had relatively low (69%) sensitivity, reflecting a high rate of false negatives. Adding three subscales to the model (Glasgow Sensory Questionnaire Auditory, Camouflaging Autistic Traits Questionnaire Compensation and Toronto Alexithymia Scale Externally Orientated Thinking) significantly improved its differentiating ability (accuracy = 88%, sensitivity = 76%, specificity = 92%). CONCLUSIONS: We have identified three subscales that, when used in combination with the AQ-10, may help clinicians understand the pattern of autistic traits in their patients with a restrictive eating disorder. This can inform clinical decisions about whether to refer for a full autism assessment and whether to adapt standard eating disorder treatments to accommodate autistic traits. Future studies are needed to test the model in samples where participants have undergone a full autism assessment.

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12. Carter Leno V, Micali N, Bryant-Waugh R, Herle M. Associations between childhood autistic traits and adolescent eating disorder behaviours are partially mediated by fussy eating. Eur Eat Disord Rev;2022 (Sep);30(5):604-615.

OBJECTIVE: Previous literature shows an increased risk for eating disorders in autistic individuals. This study tested whether fussy eating contributes to the association between childhood autistic traits and adolescent eating disorder behaviours. METHOD: Using data from the Avon Longitudinal Study of Parents and Children, we estimated the intercept and slope of parent-rated autistic traits and fussy eating between 7 and 14 years (N = 8982) and their association with self-reported eating disorder behaviours at age 14 years, including the indirect path from autistic traits to eating disorder behaviours via fussy eating. Analyses were adjusted for child sex, maternal age at delivery, maternal body mass index and maternal education. RESULTS: Analyses found a small indirect pathway from autistic traits intercept to eating disorder behaviours via fussy eating slope (b = 0.017, 95% CI = 0.002-0.032, p = 0.026), with higher levels of autistic traits at age 7 years being associated with a shallower decline in fussy eating, which in turn was associated with greater eating disorder behaviours. CONCLUSION: Findings point towards fussy eating as a potential link between childhood autistic traits and later disordered eating. Addressing fussy eating patterns before they become entrenched may decrease risk for eating disorders later in development.

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13. Babb C, Brede J, Jones CRG, Serpell L, Mandy W, Fox J. A comparison of the eating disorder service experiences of autistic and non-autistic women in the UK. Eur Eat Disord Rev;2022 (Sep);30(5):616-627.

OBJECTIVE: Qualitative studies report that autistic women have poor experiences when being treated for an eating disorder (ED) and express that ED services are not appropriately tailored to meet their needs. It is unclear whether their experience differs to other women accessing ED services. The aim of the current study was to compare autistic and non-autistic women’s ED illness history and experiences in ED services. METHOD: An online survey about ED illness history and their experience with ED treatment was completed by 46 autistic women with a restrictive ED and 110 non-autistic women with a restrictive ED. RESULTS: Despite some similarities, there were three key differences in the experiences reported by autistic and non-autistic women. First, autistic women reported a longer duration of ED and being diagnosed with an ED at a younger age than non-autistic women. Second, autistic women reported accessing a broader range of healthcare settings and ED treatments than non-autistic women when being treated for an ED. Finally, autistic women rated their experiences of inpatient care, dietetic input, and cognitive behavioural therapy (CBT) as significantly less beneficial than non-autistic women when being treated for an ED. CONCLUSION: These findings increase understanding of autistic women’s ED experience and can help to shape ED services and treatments to better accommodate the needs of their autistic clients.

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14. Chen N, Watanabe K, Kobayakawa T, Wada M. Relationships between autistic traits, taste preference, taste perception, and eating behaviour. Eur Eat Disord Rev;2022 (Sep);30(5):628-640.

Individuals with autism spectrum disorder exhibit atypical taste perception and eating behaviours. However, little is known about the effect of autistic traits on eating behaviours in the general population. This study explored the relationships between autistic traits, taste preferences, taste perceptions, and eating behaviours among Japanese population using an online questionnaire survey. The results showed significant effect of autistic traits on eating behaviours, that people with higher autistic traits tended to have higher selective eating behaviours, such as increased sensitivity to food texture and mixed flavours. Moreover, selective eating behaviours were correlated with the preference for sour taste and aftertaste sensitivity. Those results suggest that eating behaviours can be influenced by the relationship between autistic traits, taste perceptions, and taste preferences. We discuss these results in the context of previous findings, and future investigations into the possibility of solving selective eating problems in individuals with autism.

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15. Bentz M, Pedersen SH, Moslet U. Case series of family-based treatment for restrictive-type eating disorders and comorbid autism: What can we learn? A brief report. Eur Eat Disord Rev;2022 (Sep);30(5):641-647.

OBJECTIVE: Autism is more prevalent among persons with Restrictive type eating disorders (R-ED) compared to the general population and is associated with poorer outcomes across treatment modalities. Knowledge is sparse with regard to whether poorer outcomes are also associated with Family-based treatment (FBT), which is recommended as the first choice of treatment for young persons (YPs) with R-ED. This case series compares outcome between groups with and without autism in a large consecutive series of YPs with R-ED treated with FBT. METHOD: In an earlier described consecutive series of 157 YPs with R-ED treated with FBT, we compared the outcomes of the subgroup with (N = 16) and without (N = 141) comorbid autism. Primary ICD-10 diagnoses were typical (50.0) or atypical anorexia nervosa (AN) (F50.1), the latter implying a condition as typical AN but with a failure to meet one of the diagnostic criteria. Autism diagnoses were clinically assigned. The outcomes were receiving intensified care, weight normalisation and overall successful treatment. RESULTS: 10.2% (N = 16) of the sample had autism. 2.5% (N = 4) had autism diagnosed prior to the Eating Disorder (ED), and an additional 7.7% (N = 12) were diagnosed with autism during ED treatment. Significantly more YPs with autism (50%, N = 8) compared with YPs without autism (16%, N = 23) received intensified care (day programme or inpatient treatment) during their treatment. No significant difference between groups regarding neither weight normalisation nor successful ending of the treatment were found. CONCLUSION: This small sample of YPs with autism suggests that comparable proportions of YPs with and without autism may restore normal weight and end the treatment successfully within 12 months. However, more YPs with comorbid autism needed more intensive treatment, indicating that outpatient treatment delivery may not be sufficient to bring about desired change in this patient group. Findings need confirmation in a larger sample with a systematic screening for autism.

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16. Harrison A, Folk R, Proud F, Webb J, Oyeleye O, Clark Bryan D, Webb J, Webb H, Whitaker W, Dhopatkar N, Treasure J. A description of virtual skills workshops for supporters of loved ones with eating disorders: Indicators of benefit and acceptability, clinical reflections and consideration of neurodiversity. European Eating Disorders Review;2022;30(5):648-663.

Abstract Objective Providing information and support to those supporting a loved one with an eating disorder is a key part of evidence-based service provision. We report on how we took our workshops for supporters online during the Covid-19 Pandemic when country-side physical distancing restrictions meant we were unable to work face to face. Methods We outline the structure of an eight-session 2-h workshop series delivered fortnightly facilitated by a multidisciplinary team of clinicians, researchers and experts by experience. We use a repeated-measures design to understand the possible benefits of the workshops on supporter skills (n = 76). Results Measured using the Caregiver Skills Scale, we observed small-sized improvements in the overall skills (D = 0.43) of n = 17 supporters who provided data at the end of the intervention. Supporters gave largely positive feedback on the virtual format. They particularly liked the opportunity to interact with other supporters. As facilitators, we overcome our initial anxiety around workshop delivery using a new platform and reflected that having more time to cover key information and for skills practice over a period of 16 weeks offered opportunities to develop and reflect on new skill together as a group. We were also able to work with larger groups of supporters, as several barriers to access were removed. Conclusions As the workshops reached a larger number of supporters than through face to face delivery and were of benefit to those who reported on their skills, we plan to continue offering workshops to supporters online in future.

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17. Susanin A, Cooper M, Makara A, Kuschner ES, Timko CA. Autistic characteristics in youth with anorexia nervosa before and after treatment. Eur Eat Disord Rev;2022 (Sep);30(5):664-670.

OBJECTIVE: Cognitive characteristics common to autistic individuals are often seen in adults with anorexia nervosa (AN), raising the question of whether autistic people and people with AN may share an endophenotype. We need to examine autistic characteristics during the early stages of AN to accurately parse true symptom co-occurrence from behavioural alterations due to prolonged illness. METHODS: We conducted a post-hoc analysis examining autistic characteristics in 59 youth with AN. Adolescents and parents participating in a randomised-clinical trial for AN completed questionnaires probing autistic characteristics at baseline and treatment end. We categorised participants as above or below cut-offs of clinical indicators of autism using the Autism Probability Index (API) and the Autism Spectrum Quotient-10. RESULTS: Rates of high autistic characteristics ranged between 0% and 36% depending on the instrument used and how the data was obtained (i.e., by informant report or self-report). Paternal report of autistic characteristics differed across treatment completers versus non completers and maternal report indicated lower weight gain for those with elevated characteristics. CONCLUSIONS: Low rates of autism and fluctuations in autistic features during treatment underscore the importance of longitudinal examinations of autistic characteristics in adolescents with AN. Future studies need to replicate findings in a larger adolescent sample. TRIAL REGISTRATION: ClinicalTrails.gov Identifier NCT03928028.

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18. Li Z, Halls D, Byford S, Tchanturia K. Autistic characteristics in eating disorders: Treatment adaptations and impact on clinical outcomes. Eur Eat Disord Rev;2022 (Sep);30(5):671-690.

OBJECTIVE: Autistic people with eating disorders (EDs) may have special needs that are not met in standard ED treatment, raising the need for treatment adaptations to accommodate co-existing autism spectrum condition (ASC). Little is currently known about the nature of existing treatment options or adaptations for this population. We conducted a pre-registered systematic review to: (1) identify research articles describing existing interventions for patients with ED and comorbid ASC, and to critically review evidence of their clinical effectiveness and cost-effectiveness (Review 1); (2) review the impact of ASC comorbidity on ED clinical outcomes (Review 2). METHOD: Peer-reviewed studies published until the end of December 2020 were identified through a systematic search of the electronic databases: Medline, Embase, PsycINFO, Web of Science, CINAHL, Scopus and Cochrane Library. RESULTS: Only one clinical pathway of treatment adaptations (the ‘PEACE’ pathway) was identified in Review 1 with early evidence of cost-savings and favourable treatment outcomes. ASC characteristics were shown in Review 2 to have no direct impact on physical outcomes or ED symptoms, but could be associated with higher rates of comorbidities and greater use of intensive ED treatment. Additionally, patients with ASC characteristics may benefit more from individual sessions, rather than group sessions. CONCLUSIONS: Any new treatments or treatment adaptations may not directly impact on ED symptoms, but may be better able to support the complex needs of the ASC population, thus reducing subsequent need for intensive treatment. Future research is warranted to explore evidence of clinical and cost-effectiveness of interventions for this population.

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