Eating disorders are a group of mental health conditions defined by persistent disruptions in eating behavior that affect physical health and daily functioning. They affect roughly 5.2% of the population, and they carry the second highest mortality rate of any psychiatric illness, behind only opioid addiction. There are several officially recognized types, each with distinct patterns and health consequences.
Anorexia Nervosa
Anorexia nervosa involves restricting food intake to the point of significantly low body weight, combined with an intense fear of gaining weight and a distorted perception of one’s own body size. Someone with anorexia may see themselves as overweight even when they are dangerously underweight.
There are two subtypes. The restricting type involves weight loss through dieting, fasting, or excessive exercise without binge eating or purging. The binge-eating/purging type involves episodes of binge eating or purging behaviors (self-induced vomiting, laxative misuse) alongside the severe food restriction. This second subtype is sometimes confused with bulimia, but the key distinction is the persistently low body weight.
The physical toll is severe. Anorexia causes bone thinning (osteoporosis), low blood pressure, slowed heart rate and breathing, structural heart damage, and in extreme cases, multiple organ failure. Among all eating disorders, anorexia has historically carried the highest death rate.
Bulimia Nervosa
Bulimia nervosa is defined by a cycle of binge eating followed by compensatory behaviors intended to prevent weight gain. During a binge, a person eats a large amount of food in a short period and feels unable to stop. What follows is the defining feature: some form of “undoing” the binge.
Compensatory behaviors fall into two categories. Purging involves self-induced vomiting or misuse of laxatives, diuretics, or enemas. Non-purging compensation involves excessive exercise or fasting that interferes with daily life. Unlike anorexia, people with bulimia often maintain a weight that appears normal or near-normal, which can make the disorder harder to recognize from the outside.
The physical consequences reflect the purging cycle. Repeated vomiting erodes tooth enamel, causes chronic sore throat, and swells the salivary glands in the jaw and neck. Electrolyte imbalances from purging are particularly dangerous because they can disrupt heart rhythm. Acid reflux, severe dehydration, and intestinal irritation are also common. Global data shows bulimia’s incidence has been rising faster than anorexia’s over the past three decades.
Binge Eating Disorder
Binge eating disorder (BED) is the most common eating disorder, with an estimated prevalence of 1.4%. It shares the binge-eating episodes seen in bulimia, with the same sense of losing control, but without the compensatory purging, fasting, or excessive exercise afterward. That absence of compensation is the single clearest distinction between BED and bulimia.
Binge episodes typically involve eating faster than normal, eating until uncomfortably full, eating large amounts when not hungry, eating alone out of embarrassment, and feeling disgusted or deeply guilty afterward. To meet the clinical threshold, binge eating occurs at least once a week for three months or more.
Because there’s no purging to offset calorie intake, BED often leads to weight gain over time. The associated health risks include obesity, type 2 diabetes, cardiovascular problems, sleep disturbances, and gastrointestinal symptoms like acid reflux and bloating. However, not everyone with BED is overweight, and body size alone doesn’t determine whether someone has this disorder.
Avoidant/Restrictive Food Intake Disorder (ARFID)
ARFID involves severely limited eating that isn’t driven by concerns about body weight or shape. That’s what separates it from anorexia. Instead, people with ARFID restrict food for other reasons: a lack of interest in eating, anxiety about consequences like choking or vomiting, or intense sensitivity to the taste, texture, color, or smell of certain foods.
ARFID goes well beyond “picky eating.” The restriction is serious enough to cause nutritional deficiencies, significant weight loss, dependence on nutritional supplements, or interference with social functioning. Physical signs can include dizziness or fainting, muscle weakness, fine body hair (called lanugo, which the body grows to compensate for lost insulation), and difficulty concentrating. Some people with ARFID develop rigid rituals around eating, such as always consuming foods in a specific order. The disorder occurs in children and adults, though it’s most commonly identified in childhood.
Other Specified Feeding or Eating Disorder (OSFED)
OSFED is a formal diagnosis, not a lesser category. It captures eating disorders that cause significant distress and impairment but don’t fit neatly into the criteria for anorexia, bulimia, or BED. Roughly 1.6% of the population falls into this category, making it more common than anorexia or bulimia individually.
Several specific conditions fall under OSFED:
- Atypical anorexia nervosa: A person meets every criterion for anorexia, including significant weight loss, fear of weight gain, and body image distortion, but their current weight is in the normal or above-normal range. This is medically serious despite the “normal” weight.
- Low-frequency bulimia nervosa: Binge-purge cycles occur less than once a week or have lasted fewer than three months.
- Low-frequency binge eating disorder: Binge episodes occur less than once a week or have lasted fewer than three months.
- Purging disorder: Recurrent purging to control weight or shape, but without binge eating episodes beforehand.
- Night eating syndrome: Repeated episodes of eating after waking from sleep, or excessive food consumption after the evening meal, with full awareness and recall of the eating.
Pica
Pica involves persistently eating substances that are not food and have no nutritional value, such as dirt, chalk, paper, hair, ice, or paint chips. To be diagnosed as pica, the behavior must last at least one month and be inappropriate for the person’s developmental stage (infants and toddlers naturally mouth non-food objects, so pica isn’t diagnosed in very young children). It occurs most often in children, pregnant individuals, and people with intellectual disabilities. The health risks depend on what’s being consumed and can include poisoning, intestinal blockages, infections, and nutritional deficiencies.
Rumination Disorder
Rumination disorder involves repeatedly regurgitating food after eating. The food comes back up into the mouth and is then re-chewed, re-swallowed, or spit out. This isn’t the same as vomiting. The regurgitation happens because the muscular valve between the esophagus and stomach relaxes at the wrong time, creating something closer to a reflex, like an involuntary burp. It’s thought to be a learned response, sometimes developing after an illness or period of stress. It occurs in infants, children, and adults, and can lead to malnutrition and weight loss when food isn’t adequately retained.
Orthorexia: Not Yet Official
Orthorexia nervosa describes an obsessive focus on eating “pure” or “healthy” food that becomes so extreme it leads to malnutrition, social isolation, or impaired daily functioning. The term was coined in 1997, and it has received significant media attention since then, but orthorexia is not recognized as a formal diagnosis in current psychiatric classification systems. Proposed diagnostic criteria exist to guide research, but there’s no clinical consensus yet on where to draw the line between health-conscious eating and a disorder. In practice, someone showing these patterns would likely be diagnosed under OSFED or another existing category.
How Treatment Works
Eating disorder treatment is primarily psychological, often delivered in outpatient settings. The approach depends on the specific disorder, the person’s age, and the severity of symptoms.
Enhanced cognitive behavioral therapy (CBT-E) is the most broadly used treatment. It’s designed to work across all eating disorder types, targeting disrupted eating habits and distorted attitudes toward weight and shape. A typical course runs 20 sessions over 20 weeks for people who aren’t significantly underweight, or about 40 sessions over 40 weeks for those who are. For milder presentations of bulimia or BED, a guided self-help version of CBT can be effective in 10 to 20 sessions.
For adolescents with anorexia or bulimia, family-based treatment (sometimes called the Maudsley Model) is the first-line approach. It empowers parents to take an active role in their child’s recovery at home, typically over a 12-month period. For adults with anorexia specifically, other options include specialist supportive clinical management (which combines structured eating guidance with broader supportive therapy over 20 to 30 weekly sessions) and a cognitive-interpersonal model called MANTRA that addresses emotional, relational, and thinking patterns across 20 to 40 sessions.
Dialectical behavior therapy adapted for eating disorders treats binge eating as a way of coping with overwhelming emotions, combining weekly group skills training with individual therapy over about 20 sessions. Recovery timelines vary widely. Some people improve within months, while others need longer or repeated courses of treatment. Full remission, where all symptoms resolve for a sustained period, is an achievable outcome for each of the major eating disorders.