Eating Disorders in Adults: Anorexia, Bulimia, Binge Eating Disorder, and How Each Is Treated

Eating disorders affect an estimated 9 percent of the US population — approximately 28 million Americans across their lifetime — and carry the highest mortality rate of any psychiatric condition, a fact that is not widely known and that drives the urgency of early identification and treatment. They are not a problem exclusive to young white women, the demographic most often depicted in media representations; eating disorders affect people of all genders, ages, racial backgrounds, body weights, and socioeconomic contexts, and the persistent mismatch between public perception and clinical reality is a direct cause of delayed diagnosis and treatment, particularly in men, people of color, older adults, and individuals with LGBTQ+ identities. This article examines each major eating disorder, its medical consequences, who it affects, and what evidence-based treatment involves.

Eating Disorders Are Not About Vanity

Before discussing individual diagnoses, it is worth establishing what eating disorders are at their core. They are severe, complex mental illnesses with significant biological underpinning — genetic heritability studies estimate that approximately 50 to 80 percent of anorexia nervosa risk is heritable — as well as psychological and environmental components. They are not lifestyle choices, expressions of vanity, or attention-seeking behavior. The disordered eating behaviors are driven by profound psychological distress and disordered cognition around food, weight, and body image that are not within conscious volitional control. Framing them as choices rather than illnesses is one of the most harmful misconceptions in mental health, because it leads to moral condemnation rather than treatment, and because it is simply wrong.

Anorexia Nervosa

What It Is

Anorexia nervosa is characterized by persistent restriction of energy intake leading to significantly low body weight; intense fear of gaining weight or behavior that interferes with weight gain even at a significantly low weight; and disturbance in the way body weight or shape is experienced. The DSM-5 distinguishes two subtypes: restricting type (weight loss achieved through dieting, fasting, and excessive exercise without binge-purge behavior) and binge-purge type (in which recurrent episodes of binge eating or purging occur alongside restriction). The diagnosis does not require a specific BMI threshold; what matters is weight significantly below what is expected for the individual's development, with the psychological features described.

Medical Complications

The medical complications of severe anorexia are extensive and affect virtually every organ system. Cardiovascular complications — bradycardia (heart rate below 60), hypotension, QT prolongation, ventricular arrhythmias — are the primary cause of death in anorexia nervosa. Electrolyte abnormalities, particularly hypokalemia (low potassium) in those who purge, are life-threatening when severe. Bone loss (osteoporosis) begins early and can be irreversible; the peak bone mass-building years that anorexia disrupts are not fully recoverable. Hormonal disruption — amenorrhea, suppressed LH and FSH, low estrogen — compounds bone loss and impairs reproductive health. Brain volume loss has been documented on MRI, though some recovery occurs with weight restoration. Renal, hepatic, dermatological, gastrointestinal, and immunological complications are all documented.

Mortality and Why It Is the Highest of Any Mental Illness

The standardized mortality ratio for anorexia nervosa is approximately 5.9, meaning that individuals with anorexia die at nearly six times the rate of age-matched peers. Approximately half of these deaths are from medical complications of starvation; approximately 20 to 25 percent are from suicide. The ten-year mortality rate in clinical samples is approximately 5 to 10 percent; in the most severe cases requiring hospitalization, long-term mortality approaches 20 percent. These numbers justify the clinical urgency that eating disorder specialists bring to assessment and treatment escalation.

Bulimia Nervosa

The Binge-Purge Cycle

Bulimia nervosa is characterized by recurrent episodes of binge eating — consuming a definitely larger amount of food than most people would eat in a similar period under similar circumstances, with a sense of lack of control over eating during the episode — followed by recurrent compensatory behaviors to prevent weight gain. Compensatory behaviors include self-induced vomiting (the most common, used by approximately 80 to 90 percent of those with bulimia), laxative or diuretic misuse, fasting, and excessive exercise. The DSM-5 requires these behaviors to occur at least once per week for three months. Unlike anorexia, individuals with bulimia nervosa are typically at a normal or above-normal weight, which makes the disorder invisible and contributes to under-diagnosis.

Electrolyte Dangers

The medical dangers of bulimia center primarily on the consequences of purging behavior. Repeated vomiting causes loss of stomach acid, leading to metabolic alkalosis and hypokalemia (low potassium). Hypokalemia is cardiac: potassium levels below 3.0 mEq/L produce cardiac arrhythmias, and levels below 2.5 mEq/L are a medical emergency. Laxative abuse causes a different electrolyte profile — metabolic acidosis with potassium and sodium loss. Parotid gland enlargement (swelling of the salivary glands that produces the characteristic "chipmunk cheeks" appearance in some individuals with bulimia), dental enamel erosion from repeated acid exposure, esophageal tears (Mallory-Weiss tears), and calluses or abrasions on the dorsum of the hand from repeated contact with teeth during induced vomiting (Russell's sign) are physical signs that may prompt clinical detection.

Binge Eating Disorder

Binge eating disorder (BED) is the most prevalent eating disorder in the United States, more common than anorexia and bulimia combined. It is characterized by recurrent binge eating episodes — the same large-amount, out-of-control eating seen in bulimia — without the compensatory purging, fasting, or excessive exercise behaviors. DSM-5 criteria require binge episodes occurring at least once weekly for three months, associated with significant distress and at least three of the following: eating much more rapidly than normal, eating until uncomfortably full, eating large amounts when not hungry, eating alone because of embarrassment, and feeling disgusted, depressed, or guilty after overeating. BED is strongly associated with obesity, type 2 diabetes, and metabolic syndrome, though it is important to note that it occurs across the weight spectrum and that not all people with obesity have BED.

BED is frequently undiagnosed, in part because binge eating is not generally disclosed by patients and because the condition lacks the dramatic physical signs of anorexia or the purging behaviors of bulimia. Many individuals with BED have seen multiple physicians for metabolic and cardiovascular consequences of their weight without the eating disorder itself being identified or addressed. Treating the eating disorder is essential for sustainable metabolic improvement; weight management without addressing the underlying binge eating typically produces poor long-term outcomes.

Avoidant/Restrictive Food Intake Disorder (ARFID)

ARFID, introduced in DSM-5, describes food avoidance or restriction not driven by body image concerns. It encompasses several presentations: extreme sensory sensitivity to food textures, tastes, or appearances (more common in individuals with autism or ADHD); fear of aversive consequences of eating such as choking, vomiting, or allergic reactions, often following a traumatic eating experience; and apparent lack of interest in eating. ARFID is most often diagnosed in children but persists into adulthood in many cases and can cause severe nutritional deficiency, significant functional impairment, and social isolation. It is frequently under-recognized in adults, where it may present as "picky eating" without clinical concern being raised.

Who Eating Disorders Affect: Beyond the Stereotype

Men account for approximately one-third of individuals with binge eating disorder and a significant minority of anorexia and bulimia cases, yet men are substantially less likely to seek treatment and face significant barriers including stigma, diagnostic tools normed on women, and clinical under-recognition. Eating disorder screening tools and weight criteria were developed primarily from studies of women and may perform differently in men. LGBTQ+ individuals, particularly gay and bisexual men and transgender individuals, have elevated rates of eating disorders driven by body dissatisfaction and minority stress. People of color with eating disorders are significantly less likely to be identified and referred for treatment than white individuals with comparable eating disorder pathology — a disparity driven by clinician bias and the stereotyped perception that eating disorders are a "white disorder." Older adults with eating disorders are largely invisible in clinical and research literature despite meaningful prevalence in this age group.

Evidence-Based Treatments

Medical Stabilization

Medical stabilization is the first priority for patients with medical compromise. Criteria for inpatient medical admission include heart rate below 50 at rest, QTc prolongation, symptomatic hypotension, blood glucose below 60 mg/dL, severe electrolyte abnormalities, or BMI below 15 kg/m² with rapid weight loss. Medical stabilization — restoration of vital signs, electrolyte correction, nutritional rehabilitation — precedes and enables psychological treatment. Refeeding syndrome, a potentially fatal shift in electrolytes (particularly phosphate) during nutritional rehabilitation, requires careful medical management.

CBT-Enhanced (CBT-E)

Cognitive behavioral therapy enhanced for eating disorders (CBT-E), developed by Christopher Fairburn, is the most extensively evidence-based psychological treatment for bulimia nervosa and BED in adults. It addresses the core cognitive disturbances — overvaluation of shape and weight, dietary restraint, and event-driven overeating — as well as the maintaining behaviors. CBT-E for bulimia produces abstinence from binge-purge behavior in approximately 50 percent of completers and meaningful reduction in an additional 25 to 30 percent. For BED, CBT-E produces abstinence rates of 50 to 60 percent at end of treatment with good durability at one-year follow-up.

Family-Based Treatment (FBT)

Family-based treatment, also called the Maudsley approach, is the most evidence-supported treatment for adolescents with anorexia nervosa, and has some applicability in young adults. Parents are actively enlisted to re-feed the child in phase one, then gradually return control of eating to the adolescent in phases two and three. Full weight restoration is a prerequisite for psychological recovery in anorexia; cognitive distortions typically do not resolve until weight is restored because starvation itself drives much of the disordered cognition through neurobiological mechanisms.

Dialectical Behavior Therapy (DBT)

DBT, originally developed for borderline personality disorder, is effective for eating disorders with prominent emotion dysregulation, impulsivity, and self-harm, which frequently co-occur with bulimia and BED. DBT skills — distress tolerance, emotion regulation, interpersonal effectiveness — address the emotional precipitants of binge-purge and binge eating cycles.

Medications

Lisdexamfetamine (Vyvanse) is the only FDA-approved medication for binge eating disorder, producing a 40 to 50 percent reduction in binge days per week in clinical trials. Fluoxetine (Prozac) at 60 mg daily is the only FDA-approved medication for bulimia nervosa, reducing binge-purge frequency by approximately 50 percent; other SSRIs and SNRIs are also used. There are no FDA-approved medications specifically for anorexia nervosa, though olanzapine at low doses (2.5 to 10 mg) has the most consistent evidence for modest weight gain assistance and anxiety reduction in severely ill patients.

What Recovery Looks Like

Recovery from an eating disorder is possible and does occur, though it is typically a prolonged process. Long-term outcome studies show that approximately 50 to 70 percent of individuals with bulimia and BED achieve full recovery, typically over 5 to 10 years of treatment and support. Outcomes in anorexia are more variable; approximately 50 percent achieve full recovery, 30 percent have partial recovery, and 20 percent follow a chronic course. Recovery is not a linear process — relapse is common and should be understood as part of the trajectory rather than treatment failure.

When to See a Doctor

If you or someone you know is restricting eating, binge eating, purging, or has a significantly impaired relationship with food causing distress or functional impairment, clinical evaluation is appropriate. The eating disorder will not resolve with willpower, and the medical consequences of delay can be irreversible. JourneyDoctors connects you with trained specialists from $19. Start a consultation today — no waiting room, no referral needed.

Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment.

Frequently Asked Questions

Can you have an eating disorder at a normal weight?

Yes. Bulimia nervosa, binge eating disorder, and ARFID all occur across the weight spectrum and most commonly in individuals who are not underweight. Even anorexia nervosa can occur without extremely low body weight — "atypical anorexia nervosa" describes individuals who have all the psychological and behavioral features of anorexia but whose weight is within or above the normal range, often because they were previously at a higher weight. The medical and psychological severity of atypical anorexia is comparable to typical anorexia, yet these individuals are significantly less likely to be diagnosed or offered treatment.

Is anorexia always about wanting to be thin?

Body image disturbance and fear of weight gain are core features of anorexia nervosa in the DSM-5, but the psychological drivers are complex and heterogeneous. Many individuals describe using restriction and control of food as a way of managing overwhelming emotions, trauma, or a pervasive sense of lack of control in other areas of life. The thinness becomes the goal, but the restriction often serves broader psychological functions. Understanding this complexity is important because treatment that addresses only the eating behavior without the underlying emotional and cognitive components is less effective than comprehensive treatment.

What is the difference between bulimia and purging disorder?

Purging disorder is a DSM-5 "Other Specified Feeding and Eating Disorder" (OSFED) diagnosis characterized by recurrent purging behavior to influence weight or shape, but without the binge eating episodes that characterize bulimia nervosa. Individuals with purging disorder purge in response to eating normal or small amounts of food, rather than objectively large amounts. The medical risks from purging behavior are the same regardless of the quantity of food consumed, making the electrolyte and cardiovascular risks equally serious.

Can men develop anorexia?

Yes. Men account for approximately 25 to 33 percent of anorexia cases, though they are significantly under-diagnosed. Male anorexia may present differently — more focus on muscularity and fat reduction ("lean gains") rather than thin body ideals — and standard assessment tools developed for female presentations may miss the diagnosis in men. Muscle dysmorphia (a preoccupation with not being muscular enough, also called "reverse anorexia") shares cognitive features with anorexia nervosa and is significantly more common in men and in bodybuilding and fitness communities.

How do I help someone I think has an eating disorder?

Expressing concern directly, specifically, and without judgment is the most effective approach: describe the specific behaviors you have noticed rather than commenting on weight or appearance. Avoid making mealtimes confrontational or commenting on food choices. Encourage professional evaluation rather than suggesting the person "just eat more" — recovery from an eating disorder requires professional support, not a decision to eat differently. Familiarize yourself with resources including the National Eating Disorders Association (NEDA) helpline (1-800-931-2237) and the Crisis Text Line (text "NEDA" to 741741).