Eating disorders develop quietly. The changes are often gradual enough that parents notice something feels wrong before they can name it – a child who used to love food now pushing it around the plate; a teenager who has become intensely interested in nutrition but seems to be eating less; a child who is anxious and irritable around mealtimes in a way that is new. The disorder is usually well-established before the pattern becomes obvious.
This delay matters because early treatment produces substantially better outcomes. The average gap between symptom onset and treatment in the UK is around 3 years for anorexia and 5 years for bulimia – gaps during which the illness entrenches, the psychology deepens, and the physical consequences accumulate.
Healthbooq (healthbooq.com/apps/healthbooq-kids) covers adolescent mental health and wellbeing.
The Main Types
Anorexia nervosa involves restriction of food intake to a level that results in significantly low weight, driven by an intense fear of weight gain and a distorted perception of body size or shape. The stereotypical presentation – extremely thin female teenager – exists, but anorexia also presents in boys, in children who are not severely underweight, and in people of diverse body sizes. Weight is not a diagnostic criterion in itself; the psychological features are central.
Bulimia nervosa involves cycles of binge eating followed by compensatory behaviours: purging (vomiting), laxative use, excessive exercise, or fasting. Weight is often in the normal range, which means bulimia is frequently missed and even more frequently undisclosed. The shame around binge-purge behaviour is intense.
Binge eating disorder (BED) involves recurrent binge eating without regular compensatory behaviours. It is the most common eating disorder but less commonly discussed in the context of adolescents. It is associated with significant distress and often accompanies depression and anxiety.
ARFID (avoidant/restrictive food intake disorder) is a condition in which food intake is severely limited, but not driven by weight or shape concerns. The restriction is based on sensory characteristics of food (texture, appearance, smell), fear of adverse consequences (choking, vomiting), or low interest in eating. ARFID occurs across the age range including in young children and is more common in autistic individuals and those with anxiety. It is distinct from typical childhood fussiness.
Early Warning Signs
The signs that something may be developing are often behavioural before they are physical. A sudden strong interest in food, nutrition, or calories, particularly when accompanied by decreased eating, is one of the earliest signals. New food rules ("I don't eat carbs", "I only eat before 6pm") that become increasingly rigid. Disappearing to the bathroom after meals. Wearing loose clothing to hide a changing body. Avoiding eating with others. Exercising compulsively, or becoming distressed when exercise is impossible.
Physically: loss of menstrual periods in girls who previously had them; feeling cold all the time; hair loss; dental erosion (from purging); swelling of the salivary glands under the jaw; brittle nails.
Psychologically: preoccupation with food, calories, and weight; intense fear of weight gain; heightened anxiety around mealtimes; irritability and low mood; distorted body image (a child who is clearly underweight describing themselves as fat).
What Not to Say
Parents who notice these signs often don't know how to raise it. The instinct to comment on food intake or appearance – "you're not eating enough", "you've lost weight" – often backfires. Direct comments about eating or body can trigger defensive denial, increase shame, and entrench the behaviour.
Janet Treasure at King's College London, who has spent decades researching eating disorder treatment and family involvement, describes the "Collaborative Caring" approach: expressing concern about the emotional experience rather than the food itself; being curious rather than confrontational; focusing on what you have noticed in the child's mood and wellbeing rather than what they are or aren't eating.
"I've noticed you seem really stressed around mealtimes and I'm worried about you. Can you help me understand what's going on?" is more likely to open a conversation than "You need to eat more."
How Eating Disorders Are Treated
NICE guideline NG69 recommends community-based specialist eating disorder services as the primary treatment setting for children and young people. Family-based treatment (FBT, also known as the Maudsley approach) is first-line for adolescent anorexia. In FBT, parents take charge of refeeding – literally managing what their child eats – with therapist guidance. This externalises the illness from the child and gives parents an active role. Evidence from randomised trials supports FBT as significantly more effective than individual therapy for adolescent anorexia.
For bulimia in adolescents, cognitive behavioural therapy (CBT-E, the enhanced form developed by Christopher Fairburn at the University of Oxford) is first-line. It addresses the thinking patterns that maintain the binge-purge cycle.
Inpatient treatment is reserved for medical instability (dangerous electrolyte levels, cardiac changes, very low weight with rapid deterioration) and is not the default or preferred setting for most cases.
NICE guidance requires that young people with a suspected eating disorder are seen by a specialist service within one week of referral if unwell, or within four weeks if not in immediate physical danger. In practice, waiting times for CAMHS eating disorder services in England vary considerably by area.
What Parents Can Do While Waiting
Waiting for a CAMHS appointment with a child who has an eating disorder is genuinely difficult. The Beat helpline (0808 801 0677) provides support for parents. Beat also has an online community called One-to-One for young people.
Maintaining mealtimes as family events without making them battlegrounds; keeping the communication open and non-judgmental; making food as emotionally neutral as possible; avoiding commenting on anyone's body, food choices, or weight in the child's presence – these are all meaningful actions while waiting for specialist involvement.
A Note on Body Image More Broadly
Eating disorders develop at the intersection of genetics, psychological vulnerabilities, and environment. The cultural environment – social media's presentation of unattainable thinness or muscularity, diet culture, the equation of thinness with moral virtue – is a genuine risk factor, particularly for girls. Lucy Serpell (University College London) and others have documented how environments that idealise and comment on thinness accelerate eating disorder development in genetically vulnerable individuals.
A household that does not comment on bodies or assign moral value to foods, that does not diet visibly, and that emphasises health and enjoyment rather than weight provides meaningful protection.
Key Takeaways
Eating disorders are serious mental health conditions with the highest mortality rate of any psychiatric illness. Anorexia nervosa, bulimia nervosa, binge eating disorder, and avoidant/restrictive food intake disorder (ARFID) all occur in children and teenagers, with onset most common in adolescence. Early identification and treatment significantly improves outcomes. Approximately 1 in 250 girls and 1 in 2,000 boys in the UK will develop anorexia. NICE guideline NG69 provides the UK framework for treatment. Eating disorder charities Beat and the National Alliance for Eating Disorders provide support for young people and families.
