Eating disorders are heterogeneous disorders characterised by a maladaptive drive to lose weight and, for the most part, by extreme fear of weight gain and overvaluation of thin body image. Calorie restriction, overexercise and purging behaviours put some sufferers at high risk of physical morbidity and mortality. Mental preoccupations interfere with social, professional and general quality of life. Patients’ defensive secrecy and compulsivity can make it hard to diagnose and treat such disorders despite the suffering they involve. Integrated medical and psychiatric intervention can save life and safely improve nutrition. Behavioural support – with family and carer involvement when appropriate – can counter the dysregulation that leads to vicious cycles of restriction–binge–purge, helping patients develop new skills to regulate emotion without weight losing. In the future, exciting developments in neuroimaging, neurosurgery and pharmacology may lead to ways to make the brain more responsive to therapy. Insights into risk factors may also improve preventive strategies in a climate of highly sophisticated international electronic communication.

Anorexia nervosa is a potentially fatal illness that affects women and a smaller proportion of men. When a patient becomes so severely ill that admission to a medical unit is required, the risk of a poor outcome is high. Most medical services do not have sufficient expertise, without psychiatric help, to manage the nutritional, medical, behavioural and family problems that often appear. These problems interact and this can adversely affect outcome. This article discusses, with reference to the MARSIPAN report, the procedure that should be followed when such a patient presents to an acute medical service. It considers diagnosis, risk assessment, consent, re-feeding syndrome, underfeeding syndrome and treatment-sabotaging behaviours. It stresses the importance of collaboration between expert medical and psychiatric staff, and involvement of the family. When these issues are adequately addressed, the outcome for the patient is more likely to be positive.

Although most patients with severe eating disorders are treated in specialist eating disorder services, general psychiatrists are often responsible for the care of many with mild to moderate disorder. Treating and supporting these patients in a non-specialist setting can sometimes be challenging but this need not be the case. Having a clear understanding of the clinical features of these conditions forms the foundation on which a comprehensive assessment and management plan can be made. We summarise the clinical features of eating disorders and explore the unique role of the general psychiatrist in identifying people with these conditions, supporting them and directing them into evidence-based treatments.

Avoidant/restrictive food intake disorder (ARFID) was a new diagnosis in DSM-5 and is due to be included in ICD-11. However, confidence in making the diagnosis seems to be low among clinicians. Furthermore, there is no national consensus on care pathways for ARFID and therefore patients tend to be managed across core child and adolescent mental health services, specialist eating disorder services and paediatric services. If not adequately treated, ARFID can result in stunted growth, nutritional deficiency and impaired psychosocial functioning. Research and guidelines for managing this disorder are scarce, owing to low rates of diagnosis. This article aims to improve clinician confidence in the use of ARFID as a diagnosis and explores current consensus on treatment approaches, in order to progress future service planning for this complex and diverse patient group.

In this commentary, some aspects of the context of this diagnosis are considered. It is suggested that avoidant/restrictive food intake disorder (ARFID) is principally a reconfiguration of existing problems. However, it is also stressed that we still need to develop treatments that help patients and their families, given the expectation that has been fuelled by the promotion of the new diagnostic scheme. In developing those therapies, we should not forget that we previously had a number of psychosocial treatment approaches that were helpful for such children when their problems were labelled differently.

Binge eating occurs across the entire range of eating disorders. It is required for a diagnosis of bulimia nervosa but it is also seen in some cases of anorexia nervosa and in many cases of eating disorder not otherwise specified (usually referred to as eating disorder NOS or atypical eating disorder). This article focuses on the management of those eating disorders in which binge eating is a prominent feature.

Family therapy is recommended by the National Institute for Health and Care Excellence (NICE) for the management of anorexia nervosa in children and young people, but there is limited evidence to back this recommendation. The Cochrane Review under consideration evaluates the efficacy of different family therapy approaches compared with other treatments for anorexia nervosa, and this commentary puts the findings into clinical perspective.

It is now well established that children of parents who have psychiatric disorders are at risk of developing disturbances themselves (Rutter, 1989; Garmezy & Masten, 1994). Of particular concern is that these disturbances may persist well after remission of the parental disorder. Eating disorders occur commonly among women of child-bearing age (Szmukler, 1985; Fairburn & Beglin, 1990) and the prevalence seems to be rising (Treasure et al, 1996). Estimates indicate that at least 2% of women aged 16–40 suffer from bulimia nervosa or anorexia nervosa, and up to 4% when other eating disorders are considered (Fairburn & Beglin, 1990; Hoek, 1993). It is therefore surprising that the potential implications for their offspring have received so little attention until recently. Knowledge of whether these children are at risk and the mechanisms underlying any transmission of disturbance is important so that appropriate treatment can be instituted and preventive strategies put in place.

Eating disorders encompass physical, psychological and social pathologies that increase health risk. Anorexia nervosa has the highest mortality of any psychiatric disorder, but patients are not always managed by specialist eating disorders services and the duty of care sometimes falls to the general psychiatrist. This article is an aide-memoire for assessing and managing physical risk in patients with anorexia nervosa.

This article provides an overview of classification and outcome of eating disorders, before focusing on current evidence-based treatment for the two main disorders of anorexia nervosa and bulimia nervosa.

This article reviews the recent changes to the DSM diagnostic classification of feeding and eating disorders with particular reference to children and adolescents. The common clinical presentations of the ‘atypical’ feeding and eating problems of middle childhood and early adolescence are reviewed using clinical case vignettes, and the limited evidence base regarding management is summarised. There are many gaps in the evidence base and this is likely to be an area of rapid development for the field subsequent on the new terminology outlined in DSM-5.

This overview considers causes of disordered eating, including eating disorders, in older people. Eating disorders are becoming more common in older adults and research has shown a related mortality of 21%. The wide range of medical and pharmacological causes of weight loss in older people means that eating disorders may go undetected, occurring insidiously and surreptitiously.

Patients with severe and enduring eating disorders (SEED) may constitute a specific group. It is proposed that patients with anorexia nervosa (SEED-AN) or bulimia nervosa (SEED-BN) that requires the regular attention of a multidisciplinary team and is of a duration known to have a low recovery rate should be included in the SEED group. These patients present with a combination of severe symptoms and long-term illness, and may experience serious chronic physical sequelae (e.g. osteoporosis and renal failure), marked social isolation and stigma. Their carers suffer from the stress of caring for them over a prolonged period. Symptoms, treatment and crisis management of SEED-AN are discussed. SEED is a relatively recently described area of eating disorders psychiatry that requires research and service development so that patients and carers are helped to cope with very serious chronic, but not incurable, conditions.

Paul Robinson's article provides an excellent summary of some of the challenges faced by clinicians working with patients with severe and enduring eating disorders (SEED) and outlines a robust approach to the recognition and management of this complex group of patients. This commentary expands on some of the points raised, adds some further views and suggests a tailored approach to establishing a therapeutic alliance with patients and carers.