Who It Affects

Eating Disorders in Teens

Adolescence is the peak time for eating disorders to develop — and they often begin quietly, long before obvious physical signs appear. For parents and caregivers, knowing what to watch for and acting early can change the entire course of a teen’s recovery.

Eating disorders are among the most common chronic illnesses in adolescents

Written by the Eating Disorder Facts editorial team Awaiting clinical review by Cindy Hawthorn, MD Updated July 20, 2026

Key takeaways

Adolescence is the most common life stage for an eating disorder to begin — around 13% of young people develop one by age 20.
They often develop quietly; by the time physical signs appear, the disorder may already be established.
Dieting, puberty, social pressure, and social media all raise a teen’s risk.
Parents and caregivers are often the first to notice — and their early action matters enormously.
Early treatment works: family-based treatment (FBT) is the first-line approach, and outcomes are far better when eating disorders are caught early.

The scale

How common are eating disorders in teens?

Eating disorders are common in adolescence — among the most frequently diagnosed chronic illnesses in this age group. Roughly 2.7% of U.S. teens have had an eating disorder, and an estimated 13% will develop one by the age of 20. They are more common in adolescent girls than boys, but affect teens of every gender, and risk is elevated among LGBTQ+ youth and some ethnic minority groups.

Teens can develop any eating disorder — anorexia, bulimia, binge eating disorder, ARFID, and others — and binge eating and subthreshold presentations are more common than the stereotype of dramatic weight loss suggests.

The risk factors

Why adolescence is a vulnerable time

Several forces converge during the teen years:

Puberty and development. The physical changes of puberty, and the timing of them, are a recognized risk factor — earlier-developing teens are at higher risk.
Dieting. Going on a diet is one of the single biggest risk factors for developing an eating disorder at any age, and dieting is common in adolescence.
Identity and body image. Adolescence is a time of intense focus on appearance, belonging, and self-definition.
Social pressure and comparison, including from peers and social media.
Genetics and temperament, and co-occurring anxiety, depression, or perfectionism.

Recognize

Warning signs parents should watch for

Eating disorders in teens rarely announce themselves. They usually show up as a cluster of small shifts in a young person’s relationship with food, body, and activity. Watch for patterns rather than any single sign:

Behavioral

New restriction of foods or food groups, often framed as "health," "clean eating," or ethics
Growing rigidity about when, where, or how they eat
Skipping meals, with explanations that shift from week to week
Withdrawing from family dinners, restaurants, and social meals
Trips to the bathroom soon after eating
New, driven, or excessive exercise

Physical

Weight changes, fatigue, feeling cold, dizziness, or fainting
Digestive complaints, or changes to or loss of menstrual periods

Emotional

Preoccupation with weight, shape, or food
Increased irritability, anxiety, withdrawal, or low mood

Remember: you cannot tell whether a teen has an eating disorder by looking at them, and a "normal" weight does not rule one out. See the full warning signs of eating disorders.

A modern driver

The role of social media

Experts increasingly see social media as inseparable from the recent rise in adolescent eating disorders — eating-disorder-related healthcare visits among under-17s more than doubled between 2018 and 2022. Image-centric platforms fuel appearance comparison, and their algorithms can repeatedly surface body- and diet-focused content to vulnerable teens.

Parents can stay aware of certain content and hashtags associated with disordered eating — including "thinspiration"/"thinspo," "fitspiration"/"fitspo," and explicitly pro-eating-disorder ("pro-ana") material. The goal is not surveillance for its own sake but staying connected to what shapes a teen’s view of their body, and opening conversations rather than shutting them down.

Don't wait and see

Why early treatment matters so much

With eating disorders, early intervention is one of the strongest predictors of recovery. The longer a disorder goes unaddressed, the more entrenched it becomes and the harder it is to treat.

For adolescents, family-based treatment (FBT) is the first-line, best-supported approach — an outpatient treatment, usually over 6–12 months, that empowers parents to actively support their child’s renourishment and recovery. Research shows that early progress, such as weight gain in the first weeks of treatment, predicts better long-term outcomes. This is why "wait and see" is the wrong instinct: seeking an assessment early, even when you are unsure, is almost always the right call.

Taking action

How to help your teen

If you are worried, approach your teen with concern and care rather than blame or ultimatums. Focus on specific things you have noticed and on their wellbeing rather than on food or weight directly, and expect that they may deny or minimize the problem — that is part of the illness, not a reason to back off.

You do not need to be certain to act. A pediatrician or a clinician experienced with eating disorders can assess what is happening. Our guide on how to help a loved one offers more on starting the conversation, and you can find specialized help when you are ready.

There is hope

Acting early changes everything.

You do not have to be certain to seek help. Early assessment and treatment give teens the best chance at full recovery.

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