Eating Disorders: what you need to know

Eating disorders are serious mental health conditions that affect people of all ages, genders and backgrounds. They involve abnormal patterns of eating and often, exercise, that significantly interfere with a person's daily life, physical health and psychological wellbeing. Despite persistent cultural stereotypes, eating disorders do not affect only young women and they're not simply about vanity or willpower. They are complex, biologically influenced conditions that require comprehensive care.

At Metabolic Psychology, we see many people who have been living with an eating disorder for years, sometimes without a formal diagnosis, and often without having received care that addresses the full picture of what is driving their difficulties. This article is intended as an introduction to eating disorders: what they are, how they are recognised and what effective treatment involves.

The most common eating disorders

Anorexia nervosa is characterised by significant restriction of food intake leading to a dangerously low body weight relative to a person's age and height, together with marked distress about body shape and weight. Some people restrict food intake severely; others may also engage in binge eating followed by compensatory behaviours such as self-induced vomiting or laxative use.

Bulimia nervosa involves recurrent episodes of binge eating, in which a large amount of food is consumed in a discrete period with a sense of loss of control, followed by repeated compensatory behaviours aimed at preventing weight gain. People with bulimia nervosa are not typically severely underweight, which can make the condition less visible to others and delay diagnosis.

Binge eating disorder involves recurrent binge eating without the regular compensatory behaviours seen in bulimia nervosa. It is more common than is often recognised, affecting people across the weight spectrum including those in higher weight categories. Significant psychological distress, guilt and shame are typically present.

Avoidant/restrictive food intake disorder (ARFID) is characterised by highly selective or restricted food intake that is not driven by concerns about body weight or shape. It is more commonly identified in children but can emerge in adulthood, often after trauma or illness. ARFID results in significant nutritional deficiencies and weight loss.

Food addiction is not yet recognised as a formal diagnosis in the DSM-5, but it is a clinically significant phenomenon that we frequently observe in people presenting with eating disorders. Characterised by compulsive consumption of highly palatable foods despite negative consequences, loss of control over intake and failed attempts to cut down, food addiction shares neurobiological features with substance use disorders, including dysregulation of dopaminergic reward pathways. It most commonly co-occurs with binge eating disorder and bulimia nervosa, though it can present across diagnostic categories. Addressing food addiction as a distinct dimension of a person's presentation, rather than subsuming it entirely within an eating disorder diagnosis, has meaningful implications for treatment planning.

Who is affected?

Eating disorders can occur in both males and females across all age groups, though prevalence rates differ. Anorexia nervosa most commonly emerges between the ages of 15 and 19 and affects approximately one per cent of women and less than 0.5 per cent of men over a lifetime. Bulimia nervosa typically begins in late adolescence or early adulthood, affecting around two per cent of women and 0.5 per cent of men. Binge eating disorder has a broader age of onset and affects approximately 3.5 per cent of women and two per cent of men over a lifetime.

Eating disorders are not caused by any single factor. Research points to an interaction of biological, genetic, psychological, social and cultural influences. Risk factors include temperament traits such as perfectionism and difficulties with emotional regulation, a history of body dissatisfaction or dieting, exposure to weight-focused environments and a range of adverse life experiences. It is important to note that a history of dieting is among the most consistently identified risk factors for eating disorder development.

Why early treatment matters

Eating disorders carry significant physical and psychological risks. Severe malnutrition arising from restriction or purging can cause life-threatening cardiac arrhythmias, electrolyte disturbances including hypokalaemia and hypomagnesaemia, osteoporosis, hepatic and renal impairment and suppression of immune function. Structural changes to the brain have been documented in the context of prolonged starvation, and these affect cognitive function, concentration and the capacity to engage meaningfully in psychological treatment. Restoration of adequate nutrition is therefore not only a treatment goal in itself but a precondition for effective psychological work.

Nutritional deficiency is not limited to people who are visibly underweight. People with binge eating disorder are frequently found to have significant micronutrient deficiencies despite adequate or excess caloric intake, a consequence of the quality and composition of foods consumed during binge episodes as well as broader dietary dysregulation. This matters clinically because nutritional deficiencies are not only a source of medical risk; they are a source of psychiatric risk. Deficiencies in key micronutrients can directly contribute to mood disturbance, cognitive impairment and dysregulated appetite, creating a biological environment in which the eating disorder is harder to treat and more likely to persist.

Anorexia nervosa carries the highest mortality rate of any psychiatric disorder, with approximately one in twenty people dying from the condition, and risk increases with longer illness duration. For people with bulimia nervosa or binge eating disorder, serious medical complications including oesophageal damage from purging, metabolic disturbances and cardiovascular risk associated with binge-purge cycling are well documented.

Early intervention is critical. Outcomes improve substantially when treatment is initiated before medical and nutritional compromise has become entrenched and before the psychological and neurobiological consequences of malnutrition have taken hold. If you are concerned about yourself or someone you care for, the first step is to speak with your GP, who can arrange an initial assessment and a referral to an appropriate specialist or service.

What does assessment involve?

A thorough assessment is the foundation of effective treatment and is often conducted across two sessions . The assessment process typically includes a detailed clinical interview covering eating behaviours, attitudes towards weight and shape, psychiatric history, psychological functioning and broader psychosocial context. Physical health is also assessed, including weight, height, blood pressure, pulse and temperature. Where there is evidence of underweight or purging behaviours, blood tests and an electrocardiogram are indicated to detect acute medical risk. Bone mineral density assessment may also be warranted.

The treating team will use the assessment to confirm the diagnosis, identify any comorbid physical or mental health conditions and formulate an individualised treatment plan in collaboration with the person seeking help and, where appropriate, their family or carers.

What does treatment involve?

Effective treatment for eating disorders is multidisciplinary. Evidence-based guidelines consistently support the integration of nutritional rehabilitation, medical monitoring and psychological treatment. For most people, this can be delivered in an outpatient setting, though day programs or inpatient admission may be required where there is acute medical risk, rapid weight loss, inability to halt purging or significant suicidality.

Nutritional rehabilitation is a non-negotiable component of treatment for anorexia nervosa. A dietitian with experience in eating disorders will typically develop an individualised nutritional plan aimed at restoring adequate intake of macronutrients, micronutrients and energy. For adults with severe or longstanding illness, refeeding must be carefully supervised to mitigate the risk of refeeding syndrome, with close monitoring of serum phosphate, potassium and magnesium in the early stages of nutritional restoration.

Traditionally, the primary metric of nutritional rehabilitation in anorexia nervosa has been caloric adequacy and weight restoration. These remain essential goals. At Metabolic Psychology, however, we extend this framework to prioritise nutrient density alongside caloric intake, recognising that weight restoration and nutritional rehabilitation are not the same thing. The brain requires not only energy but specific nutrients to recover: amino acids as precursors to neurotransmitters, essential fatty acids for neuronal membrane integrity, B vitamins for mitochondrial function and cognitive performance, zinc for appetite regulation and mood, and iron for oxygenation and executive function, among others. Addressing these deficits directly targets the psychiatric symptoms that drive and maintain the eating disorder, not only the physical consequences of malnutrition. In our view, calorie-focused rehabilitation that restores weight without restoring metabolic health leaves the most important part of the clinical picture unaddressed.

The potential role of ketogenic dietary therapy as a targeted metabolic intervention in anorexia nervosa is an active area of investigation. Frank et al. (2026) demonstrated not only symptom reduction but significant improvements in harm avoidance, a trait-level anxiety dimension typically resistant to change, suggesting that metabolic intervention may reach dimensions of the disorder that conventional treatment does not.

Psychological treatment addresses the cognitive, emotional and behavioural dimensions of eating disorders. Cognitive behavioural therapies have the strongest evidence base for bulimia nervosa and binge eating disorder and adapted forms are used in the treatment of anorexia nervosa. Family-based therapy is the recommended first-line approach for children and adolescents with anorexia nervosa. Interpersonal psychotherapy and psychodynamic approaches may be indicated in specific presentations or where first-line treatments have not been effective.

Medication does not form part of the standard treatment for anorexia nervosa, where the evidence base for pharmacotherapy remains limited. For bulimia nervosa and binge eating disorder, antidepressant medications, particularly selective serotonin reuptake inhibitors, may be used as an adjunct to psychological treatment, with evidence that they reduce binge frequency and improve mood. Mood stabilisers or low-dose antipsychotics may be considered where there is significant anxiety, obsessional thinking or a comorbid mood disorder.

Medical care addresses the physical complications of the eating disorder and may involve input from gastroenterology, cardiology, endocrinology or dentistry depending on the individual presentation.

The role of the treating team

Most people with eating disorders benefit from coordinated care delivered by a multidisciplinary team. This typically includes a GP, psychiatrist, psychologist and dietitian, each contributing specialist expertise. At Metabolic Psychology, our team brings together consultant psychiatrists, psychologists with specialist eating disorder credentials and experienced dietitians, all working within a shared treatment framework.

Recovery is possible

Recovery from an eating disorder is possible, and treatment works. Research suggests that around half of people with eating disorders achieve full remission after traditional treatment, but what constitutes "full remission," how it is measured and how long it is sustained varies considerably across studies. In our clinical view, these figures do not represent the ceiling of what is achievable with a treatment approach that addresses the whole person. We know outcomes can improve substantially when treatment addresses not only the psychological and behavioural dimensions of an eating disorder but the underlying metabolic and nutritional environment in which the brain is trying to recover. A brain that remains depleted of the nutrients it needs to regulate mood, appetite and impulse control is a brain that will struggle to sustain the changes that psychological treatment asks of it. Addressing that biological substrate is, we believe, central to achieving recovery that is genuine and durable rather than symptomatic and fragile.

A landmark feasibility trial published this week in Communications Medicine (Frank et al., 2026) demonstrated that a weight-maintaining ketogenic dietary therapy protocol over 14 weeks was associated with clinically significant reductions in eating disorder psychopathology and depression in adults with anorexia nervosa, with 72% of completers achieving EDE-Q and depression scores within the normal range at study end.

Recovery is rarely linear. There will be periods of progress and periods of difficulty, and the risk of relapse is real, particularly during times of stress or significant life change. What matters most is maintaining a consistent therapeutic relationship, adequate nutritional support and a treatment plan that is regularly reviewed and adjusted in response to a person’s progress.