Eating Disorders: Anorexia, Bulimia, and ARFID — More Than Food

The Deadliest Psychiatric Diagnosis

Anorexia nervosa carries the highest mortality rate of any psychiatric disorder — estimated at 5–10% of diagnosed cases, with standardized mortality ratios 5–10 times that of the general population. Among females aged 15–24, anorexia is one of the leading causes of death from psychiatric illness. Yet eating disorders as a category remain understudied relative to their burden: the National Eating Disorders Association estimates that fewer than 1 in 10 people with eating disorders receives treatment. These are not disorders of vanity or willpower; they are severe, complex illnesses with strong biological, genetic, and sociocultural determinants.

Anorexia Nervosa: Two Subtypes

The DSM-5 defines anorexia nervosa around three criteria: restriction of energy intake leading to significantly low body weight; intense fear of weight gain; and disturbed experience of body weight or shape (body image disturbance, denial of seriousness). Crucially, the DSM-5 removed the amenorrhea criterion (which excluded males and girls on hormonal contraception) and abandoned specific weight thresholds in favor of "significantly low for age, sex, developmental stage, and physical health."

• Restricting subtype: weight loss achieved solely through dieting, fasting, or excessive exercise — no binge-purge episodes.
• Binge-eating/purging subtype: regular binge-eating or purging behavior (vomiting, laxatives, diuretics) during the anorexic episode; distinct from bulimia by the low weight criterion.

Atypical anorexia nervosa — meeting all AN criteria except the low weight criterion — may be more common than typical AN and carries equivalent psychological and medical burden. Weight alone is not the illness.

Bulimia Nervosa: The Hidden Disorder

Bulimia nervosa is characterized by recurrent binge-eating episodes — eating large amounts of food in a discrete period with a sense of loss of control — followed by compensatory behaviors. The DSM-5 requires these behaviors to occur at least once weekly for three months.

Compensatory behaviors include:

• Purging: self-induced vomiting (most common), laxative misuse, diuretic misuse, enemas.
• Non-purging: compensatory fasting or excessive exercise following a binge.

Bulimia has a lifetime prevalence of 1–2% in women and 0.5% in men. Because individuals are typically normal weight or overweight, the disorder is frequently invisible to clinicians and families — and often to the individuals themselves, who may not recognize binge-purge cycles as an illness rather than a failure of self-control.

Binge Eating Disorder and ARFID

Binge eating disorder (BED) — added to DSM-5 as a standalone diagnosis in 2013 — is the most prevalent eating disorder in the general population (lifetime prevalence approximately 2.6% women, 0.8% men). Unlike bulimia, BED involves binge episodes without compensatory behaviors, producing significant distress about the binges themselves. BED is strongly associated with obesity and metabolic syndrome but is not equivalent to overeating; the loss-of-control feature is diagnostically essential.

Avoidant/Restrictive Food Intake Disorder (ARFID), also new to DSM-5, captures food avoidance that is not driven by body image disturbance — the defining feature of AN and BN. ARFID involves restriction based on sensory characteristics of food (texture, smell, color), fear of choking or vomiting, or low interest in eating. It affects primarily children and adolescents and is frequently comorbid with autism spectrum disorder and ADHD. It carries significant nutritional and growth consequences but was previously excluded from eating disorder frameworks because it lacked the weight/body image component.

Medical Complications by Disorder

Treatment: Family-Based Therapy for Adolescents

Family-based treatment (FBT), developed at the Maudsley Hospital in London and formalized by James Lock and Daniel Le Grange, is the strongest evidence-based treatment for adolescent anorexia nervosa. FBT operates in three phases:

1. Phase 1 (weight restoration): Parents take full control of the adolescent's eating. Therapists help parents disrupt the eating disorder's control without blaming the patient.
2. Phase 2 (returning control): As weight is restored and anxiety decreases, the adolescent gradually regains control over eating decisions.
3. Phase 3 (identity development): Treatment shifts to adolescent development issues unrelated to eating — the eating disorder is no longer the focus.

Randomized trials show FBT superior to individual therapy for adolescent AN at 12-month follow-up. The model is sometimes mischaracterized as blaming parents; it explicitly does not — parents are externalized from the disorder and recruited as the primary treatment resource.

Weight Stigma in Treatment Settings

A substantial body of research documents that weight stigma — negative attitudes toward people in larger bodies — is prevalent among healthcare providers, including those specializing in eating disorders. The consequences are clinically significant: patients who experience weight stigma from providers show worse treatment engagement, poorer health outcomes, and higher rates of disordered eating. Weight stigma in treatment settings creates a paradox: environments meant to reduce harmful eating behaviors may reinforce them.

The Health at Every Size (HAES) framework, developed in the early 2000s, proposes decoupling health behaviors from weight outcomes — emphasizing intuitive eating, joyful movement, and body respect regardless of weight. HAES has generated controversy in eating disorder treatment, where weight restoration is medically necessary for AN. The clinical consensus is that HAES principles apply appropriately to BED and atypical AN treatment but require modification in the context of life-threatening underweight — where weight restoration is itself the primary health behavior.

This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional for diagnosis and treatment of eating disorders.