Teen eating disorders, seen clearly.

Approximately 2.7 percent of U.S. adolescents will experience an eating disorder, according to NIMH's National Comorbidity Survey data — and during the pandemic, CDC surveillance found that emergency department visits for eating disorders doubled among girls aged 12 to 17. These are not phases, diets gone slightly too far, or bids for attention. They are serious mental illnesses with real medical consequences — and they are treatable, especially when families act early.

What eating disorders actually are

An eating disorder is a mental illness in which a person's eating behavior, and usually their relationship with their body, becomes disturbed enough to damage their physical health, development, or daily functioning. In adolescents, the major diagnoses are anorexia nervosa (including its higher-weight presentation, atypical anorexia), bulimia nervosa, binge eating disorder, and avoidant/restrictive food intake disorder, known as ARFID. {CLINICAL REVIEW NEEDED}

Two facts should reframe how most parents think about this category. First, eating disorders are illnesses, not choices. Research over the past two decades points to substantial genetic and neurobiological contributions, and the behaviors — restriction, bingeing, purging, compulsive exercise — function more like the symptoms of an illness than like decisions a teen is making at you. {CLINICAL REVIEW NEEDED} Second, the old idea that families cause eating disorders has been abandoned by modern, evidence-based treatment. The leading adolescent treatment model is explicitly agnostic about cause and treats parents as the most important resource for recovery — not the problem.

The stakes are real. Anorexia nervosa carries one of the highest mortality risks of any psychiatric illness, with deaths resulting from both medical complications and suicide. {CLINICAL REVIEW NEEDED} That is not a reason to panic; it is a reason not to wait. Earlier intervention is consistently associated with better outcomes. {CLINICAL REVIEW NEEDED}

You can't tell by looking

The single most dangerous misconception about eating disorders is that you can identify them visually — that a teen with a serious eating disorder will look emaciated. Most don't. Eating disorders occur across the entire weight spectrum, and a teen at a so-called normal weight, or a higher weight, can be every bit as medically compromised as a visibly underweight one.

The diagnosis that makes this concrete is atypical anorexia nervosa: a teen who meets every criterion for anorexia — the restriction, the fear of weight gain, the distorted self-perception — without being clinically underweight, often because they started at a higher weight and lost rapidly. A 2023 systematic review of adolescents with restrictive eating disorders found that between 29 and 42 percent of those presenting with medical instability severe enough to require hospitalization were not underweight, and that the amount and speed of weight loss predicted medical risk better than the weight itself. {CLINICAL REVIEW NEEDED}

This matters because it is the exact point where families get failed. Research on patients with atypical anorexia documents a consistent pattern: concerns dismissed by providers — and sometimes by family members — because the teen "doesn't look anorexic," with weight loss praised rather than investigated. If your teen has lost a significant amount of weight rapidly, that is a medical question that needs an answer, regardless of where their weight started or where it is now.

The major diagnoses, briefly

Each of these will get its own full article in this cluster. The short version:

Anorexia nervosa is driven by restriction of intake, intense fear of weight gain, and a distorted experience of one's own body. It has the most serious medical profile of the group, affecting nearly every organ system, and it tends to convince the person who has it that nothing is wrong — limited insight is a recognized feature of the illness, not stubbornness. {CLINICAL REVIEW NEEDED}

Bulimia nervosa involves cycles of binge eating followed by compensatory behaviors, usually at a weight that looks unremarkable from the outside, which is part of why it is the most concealed of the major diagnoses. It carries its own serious medical risks, and the shame attached to the binge-purge cycle is itself a barrier to teens asking for help. {CLINICAL REVIEW NEEDED}

Binge eating disorder — recurrent episodes of eating large amounts with a feeling of being unable to stop, without compensatory behaviors — is the most common eating disorder in the population and the least likely to be treated as one. Teens with binge eating disorder are routinely handed diet advice instead of treatment, which is backwards: dieting in adolescence is a documented risk factor for eating disorders, not a remedy for them. {CLINICAL REVIEW NEEDED}

ARFID — avoidant/restrictive food intake disorder — is restriction without the body-image engine. Teens with ARFID limit what or how much they eat because of sensory sensitivity, low interest in eating, or fear of consequences like choking or vomiting, to the point of weight loss, nutritional deficiency, or real interference with daily life. It overlaps heavily with anxiety and autism, shows up in boys more than other eating disorders do, and is covered in depth in its own article because most parents have never heard of it. {CLINICAL REVIEW NEEDED}

OSFED — other specified feeding or eating disorder — is the category for presentations that are clinically serious but don't fit neatly into the boxes above. It is not a milder diagnosis. Atypical anorexia currently sits here in the DSM-5, which tells you how little the category labels track severity. {CLINICAL REVIEW NEEDED}

What parents actually notice first

Eating disorders are concealed by design, so parents rarely see the behaviors directly. What they see is the wake the illness leaves. In broad strokes — and deliberately without behavioral detail — the changes that warrant attention cluster in four areas:

• Changes around food and meals. New food rules, shrinking lists of acceptable foods, skipped family meals, eating alone, new and rigid opinions about ingredients, unusual intensity about cooking for others without eating.
• Changes in the body's signals. Significant weight change in either direction, feeling cold all the time, dizziness, fainting, loss of menstrual periods, stomach complaints, visible exhaustion. {CLINICAL REVIEW NEEDED}
• Changes around movement. Exercise that has stopped being optional — distress when a workout is missed, activity that continues through injury or illness.
• Changes in mood and social life. Withdrawal from friends, irritability concentrated around mealtimes, anxiety and rigidity that weren't there before, secrecy.

No single item on that list is a diagnosis. The pattern — several of them, sustained, getting worse — is what matters. And one more time, because it is the error with the highest cost: weight that looks fine does not rule anything out.

What evidence-based treatment looks like

For adolescents, eating disorder treatment has a clearer evidence hierarchy than most parents expect — and it does not start with sending your teen away.

Family-based treatment (FBT) is the recommended first-line outpatient treatment for medically stable adolescents with anorexia nervosa, and adapted forms are used for bulimia. {CLINICAL REVIEW NEEDED} In FBT, parents — coached by a trained therapist — take temporary charge of restoring their teen's nutrition at home, and hand control back in stages as the teen recovers. In the landmark randomized trial by Lock and Le Grange, FBT outperformed individual adolescent-focused therapy on sustained full remission, and subsequent meta-analyses have confirmed large effects, with sustained full remission rates above 40 percent — a genuinely strong number for this illness, though honesty requires saying it is not a guarantee. {CLINICAL REVIEW NEEDED} A full article in this cluster explains what FBT's three phases actually involve and why the approach, which sounds counterintuitive, works.

Cognitive behavioral therapy (CBT), particularly enhanced CBT adapted for eating disorders, has the strongest evidence base for bulimia nervosa and binge eating disorder. {CLINICAL REVIEW NEEDED}

Medical monitoring is not optional. Whatever the therapy, an adolescent in eating disorder treatment needs a physician tracking vital signs, labs, and growth — restrictive eating disorders are medical illnesses as much as psychiatric ones, and some complications are silent until they aren't. {CLINICAL REVIEW NEEDED}

What about higher levels of care — intensive outpatient, partial hospitalization, residential, inpatient? They exist for real reasons: medical instability, acute psychiatric risk, or outpatient treatment that has genuinely been tried and isn't working. But the marketing of residential eating disorder treatment is among the most aggressive in behavioral health, and it routinely positions residential as the serious, responsible default. The evidence points the other way: for medically stable teens, well-delivered FBT at home is the first-line recommendation and can reduce the need for residential care at all. {CLINICAL REVIEW NEEDED} Our levels of care guide covers how to think about the full spectrum, and the investigative library covers the industry context.

When it's an emergency

Some situations are not wait-for-an-appointment situations. Fainting, chest pain, a very low or irregular heart rate, signs of dehydration, blood in vomit, or any statement about self-harm or suicide warrants same-day medical attention — an emergency department if that's what's available. {CLINICAL REVIEW NEEDED} Medical instability can exist at any weight, and emergency clinicians can measure in minutes what no parent can assess at home. If your gut says something is acutely wrong, act on it; the embarrassing version of this story is the one where everything turns out fine.

How to start

If the recognition section of this page read like a description of your kitchen table, here is the sequence that serves families best:

• Start with medicine, not negotiation. Book a medical evaluation — a pediatrician or, ideally, an adolescent medicine physician with eating disorder experience. Tell the office why you're coming in so the visit is built for it, and report the specific changes you've observed rather than relying on your teen to self-report. Ask directly for vital signs, orthostatic measurements, and labs. {CLINICAL REVIEW NEEDED}
• Don't be deterred by a normal-looking weight — yours or your provider's instinct about it. If concerns are dismissed without measurement, ask again or seek a second opinion. The research on weight stigma in eating disorder care exists because this happens constantly.
• Ask specifically about FBT when seeking therapy for a restrictive eating disorder, and ask prospective therapists what proportion of their practice is adolescent eating disorders. Generalist therapy is not the same tool.
• Don't wait for your teen to agree something is wrong. Denial is part of the illness. Adolescent treatment is designed around that fact.
• Use the state guides. Our find-help section covers how adolescent mental health care actually works state by state — coverage, regulators, and crisis lines.