There are seven recognized eating disorders, ranging from widely known conditions like anorexia nervosa to less familiar ones like pica and rumination disorder. Each involves distinct patterns of eating behavior that cause real physical harm or significant distress, and they can affect people of any age, gender, or body size.
Anorexia Nervosa
Anorexia nervosa involves severe restriction of food intake driven by an intense fear of gaining weight and a distorted perception of one’s own body. People with anorexia often see themselves as overweight even when they are dangerously underweight, though the condition can also occur at higher body weights (more on that below under OSFED).
The physical toll is significant. Restricting calories to extreme levels can cause irregular heart rhythms, dangerously low blood pressure, and dehydration. Hair thins and falls out. Skin may turn dry or yellowish. A soft, downy hair called lanugo can grow across the body as it tries to insulate itself. Fingers may appear blue from poor circulation. In younger people, growth and puberty can stall entirely.
What makes anorexia particularly difficult to spot is that “low body weight” looks different on every person. Someone may be losing weight rapidly and experiencing all of these complications without appearing visibly emaciated.
Bulimia Nervosa
Bulimia nervosa follows a cycle of binge eating followed by compensatory behaviors meant to prevent weight gain. These behaviors include self-induced vomiting, misuse of laxatives, fasting, or excessive exercise. For a clinical diagnosis, this cycle needs to occur at least once a week for three months.
The health consequences reflect the strain of repeated purging. Stomach acid from vomiting erodes tooth enamel, sometimes making teeth translucent. The esophagus can become inflamed or even tear. Cheeks may swell from enlarged salivary glands. Electrolyte imbalances, particularly low potassium, put the heart at risk for dangerous rhythm disturbances and, in severe cases, heart failure. Longer-term complications include stomach and throat ulcers, irritable bowel syndrome, and type 2 diabetes.
Unlike anorexia, people with bulimia often maintain a weight that appears “normal,” which can make the disorder invisible to friends and family for years.
Binge Eating Disorder
Binge eating disorder is the most common eating disorder in the United States, with a lifetime prevalence of about 2.8%. It affects women at roughly twice the rate of men. At any given time, about 1.2% of the population meets the diagnostic criteria.
During a binge episode, a person eats a large amount of food in a short period and feels a painful loss of control while doing so. Unlike bulimia, there is no purging afterward. Instead, episodes are followed by intense shame, guilt, or disgust. People with binge eating disorder often eat when they aren’t hungry, eat until uncomfortably full, or eat alone because they feel embarrassed about how much they’re consuming.
The distress is the defining feature. Everyone overeats occasionally, but binge eating disorder involves a recurring pattern that causes real emotional suffering and often leads to weight gain, metabolic problems, and cardiovascular strain over time.
Avoidant/Restrictive Food Intake Disorder (ARFID)
ARFID is not about body image. People with this disorder severely limit the types or amounts of food they eat because of sensory sensitivities (certain textures, smells, or colors are intolerable), a fear of choking or vomiting, or a general lack of interest in food. It goes well beyond “picky eating.” The restriction is severe enough to cause nutritional deficiencies, weight loss, or an inability to meet developmental milestones in children.
Without treatment, ARFID can lead to anemia, low blood pressure, osteoporosis, electrolyte imbalances, dehydration, and delayed puberty in young people. In extreme cases, the malnutrition becomes life-threatening. The disorder can stem from anxiety, trauma, genetic factors, or a combination of social and environmental influences, and it often begins in childhood, though adults develop it too.
Other Specified Feeding and Eating Disorder (OSFED)
OSFED is a formal diagnosis, not a catch-all for mild cases. It covers eating disorders that cause serious distress and impairment but don’t fit neatly into the criteria for anorexia, bulimia, or binge eating disorder. Several well-defined subtypes fall under this umbrella.
Atypical anorexia nervosa describes someone who meets every criterion for anorexia, including the extreme food restriction and fear of weight gain, but whose body weight remains in or above the “normal” range. The psychological distress and medical complications can be just as severe as in typical anorexia, which is why this diagnosis matters. It challenges the assumption that eating disorders only affect thin people.
Purging disorder involves repeated purging behaviors (vomiting, laxative misuse) to control weight, occurring at least once a week for three months, but without the binge eating episodes that define bulimia. The person’s self-worth is heavily tied to body shape or weight.
Night eating syndrome involves consuming a significantly large portion of daily calories in the evening or overnight. This goes beyond a late-night snack. It typically disrupts sleep and is associated with genuine distress about the pattern.
Pica
Pica involves persistently eating non-food substances like paper, clay, dirt, chalk, hair, string, or wool. To qualify as a disorder, the behavior has to last at least a month and be inappropriate for the person’s developmental stage (infants naturally mouth objects, so pica isn’t diagnosed in very young children). It occurs across all age groups and is more common in people with intellectual disabilities, during pregnancy, and in young children.
The risks depend on what’s being consumed. Eating dirt or paint chips can cause lead poisoning. Swallowing hair or string can create blockages in the digestive tract. Nutritional deficiencies, particularly iron deficiency, are both a cause and a consequence of pica in some cases.
Rumination Disorder
Rumination disorder involves repeatedly bringing up already-swallowed food, which is then re-chewed, re-swallowed, or spit out. This isn’t the same as vomiting. There’s no nausea or retching involved. The regurgitation can be voluntary or involuntary and typically happens daily, often shortly after meals.
In infants, rumination disorder sometimes resolves on its own, but in older children and adults, it can lead to malnutrition, weight loss, dental erosion, and social isolation (people often avoid eating around others). The behavior is not caused by a gastrointestinal condition, though it may initially be mistaken for one.
How Eating Disorders Are Treated
Treatment depends on the specific disorder, the person’s age, and how long they’ve been living with it. Two approaches have the strongest evidence behind them.
Enhanced cognitive behavioral therapy (CBT-E) is designed to work across all major eating disorders. It focuses on identifying and changing the thoughts, feelings, and behaviors that maintain disordered eating. For someone who isn’t significantly underweight, a typical course runs about 20 weekly sessions over five months. For someone who is underweight and needs to restore weight as part of recovery, treatment is longer, often around 40 sessions over 40 weeks.
Family-based treatment (FBT) is the leading approach for children and adolescents under 19, particularly those who’ve had an eating disorder for less than three years. Rather than treating the young person alone, FBT puts parents in charge of restoring their child’s nutrition and weight before gradually handing control of eating back to the young person. It has strong evidence for anorexia in young people, and an adapted version is recommended as the first-line treatment for bulimia in children and teens.
Both approaches require therapists with specialized training in eating disorders, not just general mental health expertise. Recovery timelines vary widely. Some people improve within months, while others work through treatment over several years, particularly with anorexia, which has one of the longest average recovery periods of any psychiatric condition.