There are several officially recognized eating disorders, each defined by distinct patterns of eating behavior and psychological distress. The main types include anorexia nervosa, bulimia nervosa, binge eating disorder, avoidant restrictive food intake disorder (ARFID), pica, and rumination disorder. Beyond these, a catch-all category covers presentations that don’t fit neatly into one box, and at least one condition, orthorexia, is gaining clinical attention but isn’t formally recognized yet.
Anorexia Nervosa
Anorexia nervosa involves severely restricting food intake to the point of maintaining a significantly low body weight. The restriction is driven by an intense fear of gaining weight and a distorted sense of body size or shape. People with anorexia often don’t see themselves as underweight, even when they are dangerously thin.
There are two subtypes. The restricting subtype involves strict limitation of food without binge eating or purging. The binge-eating/purging subtype includes episodes of binge eating or purging behaviors like self-induced vomiting or laxative misuse, but the person still maintains a low body weight overall. Personality traits like perfectionism, rigid thinking, and difficulty expressing negative emotions frequently appear before the disorder develops.
The physical toll is serious. Prolonged starvation thins the bones, damages the heart’s structure and function, and in severe cases can lead to multiorgan failure. Comorbid depression and anxiety disorders are common.
Bulimia Nervosa
Bulimia nervosa is defined by recurring cycles of binge eating followed by compensatory behaviors to prevent weight gain. A binge means consuming an unusually large amount of food while feeling completely unable to stop. To qualify for diagnosis, both the binges and the compensatory behaviors need to happen at least once a week for three months.
Compensatory behaviors include self-induced vomiting, fasting, excessive exercise, and misuse of laxatives, diuretics, or other medications. Unlike anorexia, people with bulimia often maintain a weight that appears normal or above normal, which can make the disorder harder for others to notice. The repeated purging creates dangerous electrolyte imbalances, where sodium, potassium, and calcium levels swing to extremes that can trigger a stroke or heart attack.
Binge Eating Disorder
Binge eating disorder (BED) is the most common eating disorder. It shares the binge-eating component of bulimia but without the compensatory purging, fasting, or excessive exercise afterward. The key distinction from ordinary overeating is a persistent feeling of being out of control around food, not just eating a large holiday meal once in a while.
During a binge episode, a person typically eats a much larger amount of food than usual within a defined window, often about two hours. Afterward, they feel depressed, disgusted, ashamed, guilty, or upset about their eating. That emotional aftermath is a core feature of the disorder, not a side effect. BED affects people across all body sizes, though it is associated with weight gain over time.
Avoidant Restrictive Food Intake Disorder (ARFID)
ARFID goes well beyond picky eating. People with ARFID restrict their food intake so severely that it leads to nutritional deficiencies, significant weight loss, or an inability to meet energy needs, but the restriction has nothing to do with body image or a desire to lose weight. That’s what separates it from anorexia.
Three patterns typically drive the restriction. Some people have genuine sensory sensitivities and will only eat foods of certain textures, colors, or temperatures. Others have a deep fear of choking or vomiting that makes eating feel dangerous. A third group simply lacks appetite or interest in food altogether. ARFID can appear in childhood and persist into adulthood, and it often requires family involvement in treatment, since caregivers play a central role in reintroducing foods and reducing avoidance.
Pica
Pica involves persistently eating substances that are not food and have no nutritional value. Examples include ice, dirt, chalk, paper, soap, or hair. To be considered pica, the behavior needs to last at least one month and be inappropriate for the person’s developmental stage (a toddler briefly mouthing a non-food object wouldn’t count). Pica can occur alongside other eating disorders or conditions like iron deficiency, pregnancy, or intellectual disabilities, but it is classified as its own distinct disorder.
Rumination Disorder
Rumination disorder involves repeatedly bringing up food that has already been swallowed, then rechewing, reswallowing, or spitting it out. This is not vomiting. The regurgitation is effortless and doesn’t involve retching or nausea. People with the condition don’t appear distressed during episodes, and the process may even seem pleasurable to them. Rumination disorder can occur at any age but is most commonly identified in infants and people with intellectual disabilities. When it persists, it can lead to malnutrition and weight loss.
Other Specified Feeding or Eating Disorders (OSFED)
OSFED is a formal diagnostic category for eating disorders that cause significant distress and impairment but don’t meet the full criteria for anorexia, bulimia, or BED. It is not a lesser diagnosis. People with OSFED experience the same severity of physical and psychological harm as those with other eating disorders. Several specific presentations fall under this umbrella.
Atypical anorexia nervosa looks exactly like anorexia, with all the same restrictive behaviors and psychological features, except the person’s weight remains in or above the normal range despite significant weight loss. This is important because the same dangerous medical complications, including heart problems and bone loss, can still occur even at a “normal” weight.
Purging disorder involves recurring purging behaviors like vomiting, laxative misuse, or diuretic misuse to control weight, but without the binge-eating episodes that define bulimia. The person purges after eating normal or small amounts of food.
Night eating syndrome features recurrent episodes of eating after waking from sleep or consuming excessive amounts of food after the evening meal. The person is fully aware of and remembers the eating, which distinguishes it from sleep-related eating disorder. The episodes cause significant distress.
Orthorexia: Not Yet Official
Orthorexia nervosa describes an obsessive fixation on eating “correctly” or “purely” that becomes rigid enough to impair health or daily life. Unlike anorexia, the goal is not thinness but the pursuit of health, whether real or perceived. People with orthorexia may avoid entire food groups or specific cooking methods out of fear that certain foods will harm them long term. They may also withdraw from social situations involving food to stick to their dietary rules.
Orthorexia is not listed in the DSM-5-TR as a standalone diagnosis, partly because validated diagnostic criteria are still being developed and assessment tools have been inconsistent. Some of its features overlap with ARFID and with obsessive-compulsive disorder, sharing traits like rigidity, perfectionism, and emotional dysregulation. When clinically significant, it would currently be diagnosed under OSFED or another existing category. Still, it is increasingly discussed in clinical settings as eating patterns centered on “clean eating” become more culturally prevalent.
Physical Health Effects Across Types
Every eating disorder carries physical risks, not just the ones involving visible weight loss. Purging behaviors, whether in bulimia, purging disorder, or the binge-purge subtype of anorexia, destabilize electrolyte levels. Potassium, sodium, and calcium can drop or spike to levels that threaten the heart. Prolonged restriction thins bones, sometimes irreversibly. Heart damage can occur in anorexia even before a person appears critically underweight, and atypical anorexia carries the same cardiac risks despite a “normal” appearance.
Binge eating disorder increases the risk of metabolic complications over time. ARFID and pica can both cause serious nutritional deficiencies. Rumination disorder, when persistent, leads to malnutrition, dental erosion, and damage to the esophagus. The takeaway across all types is that eating disorders are medical conditions with physical consequences, regardless of whether someone “looks sick.”