Eating disorders rarely arrive with an announcement. The changes are usually slow enough that parents notice something is wrong before they can put a name to it. A child who used to love food now pushes it round the plate. A teenager has become unusually interested in nutrition labels but seems to be eating less. Mealtimes have become tense in a way they were not six months ago. By the time the pattern becomes obvious, the disorder is often well established.
That delay matters, because early treatment changes outcomes. The average gap between symptom onset and treatment in the UK is around 3 years for anorexia and 5 years for bulimia. Those are years during which the illness entrenches, the psychology hardens, and the physical consequences accumulate. For more on adolescent mental health, visit Healthbooq.
The Main Types
Anorexia nervosa is restriction of food intake driving significantly low weight, paired with intense fear of weight gain and a distorted perception of body size or shape. The stereotype — extremely thin teenage girl — is real but incomplete. Anorexia presents in boys, in children whose weight is not yet visibly low, and in young people of all body sizes. Weight is not the diagnostic criterion. The psychology is.
Bulimia nervosa involves cycles of binge eating followed by compensatory behaviours — vomiting, laxatives, excessive exercise, or fasting. Weight is often in the normal range, which is why bulimia is missed for years and why the shame around it is so heavy.
Binge eating disorder (BED) is recurrent binge eating without the compensatory behaviours of bulimia. It is the most common eating disorder overall, including in adolescents, and it travels closely with depression and anxiety.
ARFID (avoidant/restrictive food intake disorder) is severe food restriction that is not driven by weight or shape concerns. The driver is sensory aversion (texture, smell, appearance), fear of choking or vomiting, or genuine low interest in eating. ARFID is more common in autistic young people and in those with anxiety disorders, and it is distinct from typical childhood fussiness — the restriction is severe enough to cause weight loss, nutritional deficiency, or major impairment.
Early Warning Signs
The behavioural signs usually arrive before the physical ones. Look for a sudden, intense interest in food, calories, or "clean eating" alongside reduced intake. New food rules that grow more rigid over time ("I don't eat after 6", "no carbs", "no fat"). Disappearing to the bathroom after meals. Wearing baggier clothes to hide a changing body. Avoiding eating in front of others. Exercise that has shifted from enjoyable to compulsive — distress when it cannot happen, exercising in secret, exercising while injured.
Physical signs include loss of menstrual periods in girls who previously had them, feeling cold all the time, hair thinning or fine new body hair (lanugo), dental erosion from purging, swelling of the salivary glands at the angle of the jaw, brittle nails, and dizziness on standing.
Psychologically: preoccupation with food and weight, intense anxiety around mealtimes, irritability and low mood, withdrawal from friends, and body image that does not match what you see — a clearly underweight child describing themselves as fat.
What Not to Say
The instinct, when you notice these signs, is to comment directly on eating or appearance. "You're not eating enough." "You've lost weight." That kind of comment, however well-meant, almost always backfires. It triggers defensive denial, increases shame, and can entrench the behaviour.
Janet Treasure at King's College London, who has spent decades researching family-based treatment, frames the alternative as "Collaborative Caring": express concern about the emotional experience rather than the food itself, stay curious rather than confrontational, focus on what you have noticed in mood and wellbeing rather than what is or is not on the plate.
"I've noticed you seem really stressed around mealtimes lately, and I'm worried about you. Can you help me understand what's going on?" opens a door. "You need to eat more" closes one.
Avoid commenting on weight at all — your child's, your own, anyone's. Avoid moralising about food (good food, bad food, clean food, junk). These are not abstract pieties. They are documented risk factors.
How Eating Disorders Are Treated
NICE guideline NG69 sets community-based specialist eating disorder services as the primary treatment setting for children and young people. For adolescent anorexia, family-based treatment (FBT, also known as the Maudsley approach) is first-line. In FBT, parents take charge of refeeding under therapist guidance. This sounds counterintuitive but the evidence base — including randomised trials by Lock and Le Grange — supports it strongly. It externalises the illness from the child, gives parents an active role, and works.
For bulimia in adolescents, enhanced cognitive behavioural therapy (CBT-E, developed by Christopher Fairburn at the University of Oxford) is first-line. It targets the thinking patterns that maintain the binge-purge cycle.
Inpatient treatment is reserved for medical instability — dangerous electrolyte derangement, cardiac changes, very low weight with rapid deterioration. It is not the default and is not usually the goal.
NICE requires that young people with a suspected eating disorder are seen by a specialist service within 1 week if unwell or 4 weeks otherwise. Real-world CAMHS waiting times in England vary considerably. Pushing for an urgent referral, in writing, with documented physical concerns, often shortens the wait.
What Parents Can Do While Waiting
Waiting for specialist help with a sick child is genuinely hard. Beat, the UK eating disorder charity, runs a helpline (0808 801 0677) with separate lines for parents, and an online community for young people. In the US, NEDA's helpline (1-800-931-2237) plays the same role.
Practical things matter while you wait. Keep mealtimes as family events without making them battlegrounds. Sit and eat together. Keep food emotionally neutral — no praise for "good" eating, no comments on what others are eating, no diet talk in the home. Stop commenting on bodies, including your own. Make sure your GP knows what is happening so physical observations (weight, blood pressure, heart rate, bloods) are being tracked.
If your child shows signs of medical instability — fainting, very slow heart rate, chest pain, severe dehydration, or rapid weight loss — go to A&E. Eating disorders kill, and the deaths are usually cardiac.
A Note on Body Image
Eating disorders develop at the intersection of genetics, psychological vulnerability, and environment. The cultural environment is part of that. Social media's relentless presentation of unattainable thinness or muscularity, diet culture, the equation of thinness with virtue — these accelerate eating disorder development in young people who are genetically vulnerable. Lucy Serpell at UCL and others have documented this.
A household that does not comment on bodies, does not diet visibly, treats food as ordinary rather than moral, and emphasises wellbeing rather than weight provides genuine protection. It will not prevent every eating disorder. It removes a meaningful layer of risk.
Key Takeaways
Eating disorders are serious mental illnesses with the highest mortality rate of any psychiatric condition. Anorexia nervosa, bulimia nervosa, binge eating disorder, and ARFID all occur in children and teenagers. Early treatment substantially improves outcomes. Roughly 1 in 250 girls and 1 in 2,000 boys in the UK will develop anorexia. NICE guideline NG69 sets out the UK treatment framework. Beat (UK) and NEDA (US) provide support for young people and their families.
