Eating Disorders in Children and Teenagers: Early Warning Signs

As a paediatric nutritionist who has worked across the NHS and in private practice for over 15 years, I have seen a significant rise in eating disorders among children and teenagers. What concerns me most is not just the increasing numbers, but how often early warning signs are missed by well-meaning parents who simply do not know what to look for. Eating disorders in children and teenagers can look very different from what we might expect, and recognising the signs early can make a profound difference to your child’s recovery.

In this guide, I want to share what I have learned from working with hundreds of families: the subtle signs that something may be wrong, why these conditions develop, and what you can do to help your child before things escalate.

What Are Eating Disorders in Children and Teenagers?

Eating disorders are serious mental health conditions that involve a disturbed relationship with food, eating, body weight or body shape. They are not a lifestyle choice or a phase that children simply grow out of. According to the NHS overview on eating disorders, these conditions can affect anyone regardless of age, gender or background, though they most commonly develop during adolescence.

What many parents do not realise is that eating disorders can begin much earlier than the teenage years. In my clinical experience, I have assessed children as young as seven who were showing clear signs of disordered eating. The number of children under 12 being referred to specialist eating disorder services has increased notably since 2020, and this trend shows no sign of slowing.

It is also important to understand that eating disorders are not solely about food. They are often a way for children and teenagers to cope with difficult emotions, a need for control, or overwhelming stress. The relationship between children’s mental health and nutrition is deeply intertwined, and addressing one without the other rarely leads to lasting improvement.

Why Do Eating Disorders Develop in Young People?

There is no single cause of eating disorders in children and teenagers. In my experience, they almost always develop from a combination of factors that converge at a vulnerable moment in a young person’s life. Understanding these risk factors can help parents stay alert to potential warning signs.

Biological factors play a role. Research suggests there is a genetic component to eating disorders, meaning children with a family history of these conditions may be more susceptible. Changes in brain chemistry, particularly around puberty, can also contribute.

Psychological factors are often significant. Children who are perfectionists, have low self-esteem, experience anxiety or have difficulty expressing emotions may be more vulnerable. I frequently see eating disorders develop alongside other mental health difficulties such as depression or obsessive-compulsive tendencies.

Social and environmental factors include peer pressure, bullying (particularly weight-related teasing), social media exposure and cultural messages about body ideals. The impact of screen time on children’s health extends well beyond physical inactivity; constant exposure to filtered images and diet culture content on platforms like Instagram and TikTok is a genuine concern I raise with nearly every family I see.

Life transitions and trauma can trigger disordered eating. Starting secondary school, parental separation, bereavement, academic pressure, or even the transition through puberty itself can act as catalysts. The COVID-19 pandemic proved to be a major trigger, with Beat, the UK’s eating disorder charity, reporting a dramatic increase in contacts to their helpline during and after lockdowns.

Issues around body image and self-esteem in children are often at the heart of these conditions. When a child’s sense of self-worth becomes tangled up with how they look or what they eat, the foundations for disordered eating can be laid very quickly.

Early Warning Signs Every Parent Should Know

One of the most important things I tell parents is this: you do not need to wait for dramatic weight loss to be concerned. Many children with eating disorders maintain a relatively stable weight, at least in the early stages. The signs are often subtle and easy to dismiss as normal adolescent behaviour or fussiness.

Here are the early warning signs I encourage every parent to watch for:

• Changes in eating habits: skipping meals, claiming to have already eaten, cutting food into very small pieces, eating unusually slowly, or suddenly adopting restrictive diets (vegan, gluten-free, “clean eating”) without medical reason
• Preoccupation with food: obsessively reading labels, counting calories, cooking elaborate meals for others but not eating them, or watching food-related content online for hours
• Body dissatisfaction: frequent negative comments about their body, repeated body checking in mirrors, wearing baggy clothes to hide their shape, or comparing themselves unfavourably to peers
• Withdrawal from social eating: avoiding family meals, refusing to eat in front of others, making excuses not to attend events involving food such as birthday parties or school dinners
• Mood changes around mealtimes: becoming anxious, irritable or tearful before, during or after eating
• Increased secrecy: hiding food, eating alone, becoming defensive or angry when asked about eating patterns

If your child is a fussy eater, it can be particularly difficult to distinguish between selective eating and the early stages of an eating disorder. The key difference is usually the emotional component: fussy eating tends to be about taste and texture preferences, whereas disordered eating is driven by anxiety, fear of weight gain or a need for control.

Physical Signs of Eating Disorders in Children

The body often reveals what a child may be trying to hide. Physical signs can develop gradually, which is why regular monitoring matters. In my practice, I always advise parents to keep an eye on the following physical indicators.

I want to emphasise that children do not need to be underweight to have an eating disorder. Some of the most unwell young people I have worked with were at a healthy or even above-average weight. This is particularly true of conditions like bulimia nervosa and binge eating disorder. If you are unsure whether your child may be underweight, monitoring their growth trajectory is more informative than a single weight measurement.

Nutritional deficiencies, particularly iron deficiency, can develop quickly when a child restricts their diet. If your child appears unusually pale, fatigued or is struggling to concentrate at school, it is worth discussing blood tests with your GP.

Emotional and Behavioural Warning Signs

In many cases, the emotional and behavioural changes appear before the physical ones. These are the signs that parents are most likely to notice first, though they can easily be attributed to “normal teenage behaviour.” I would encourage you to trust your instincts if something feels different about your child.

Increased anxiety or rigidity around food routines. Your child may insist on eating at exact times, using specific plates, or following rituals before eating. While some routine is normal, an increase in rigid behaviour around mealtimes is worth noting.

Excessive exercise. This is one of the most commonly missed signs, particularly in sporty children. When exercise shifts from being enjoyable to compulsive, when your child becomes distressed if they cannot exercise, or when they exercise in secret (doing sit-ups in their room at night, for instance), it may signal a problem. This goes beyond the healthy physical activity we encourage in children.

Social withdrawal. A child who once loved spending time with friends may start declining invitations, particularly those involving food. They may become increasingly isolated, spending more time alone in their room.

Difficulty concentrating at school. Malnutrition directly affects cognitive function. If teachers report that your child seems distracted, unfocused or that their academic performance has dropped, this can be a consequence of inadequate nutrition.

Increased interest in others’ eating. Watching what siblings or parents eat, commenting on portion sizes, or encouraging others to eat while restricting their own intake is a pattern I see frequently.

Visiting the bathroom immediately after meals. While this alone is not proof of purging, a consistent pattern of disappearing to the bathroom straight after eating warrants gentle attention.

The way we approach mealtime habits and a healthy relationship with food at home can influence whether these behaviours escalate or are addressed early. Creating a calm, pressure-free mealtime environment is one of the most protective things a family can do.

Eating Disorders in Boys: The Overlooked Signs

One of my greatest frustrations in clinical practice is how frequently eating disorders in boys are missed or dismissed. Boys account for roughly one in four eating disorder cases in young people, yet they are often diagnosed much later than girls because parents, teachers and even healthcare professionals are not looking for the signs.

Eating disorders in boys often present differently. Rather than pursuing thinness, boys may become obsessed with muscularity, leanness or achieving a particular physique. This can manifest as:

• Obsessive focus on protein intake, supplements or “bulking and cutting” cycles
• Compulsive exercise, particularly weight training, that dominates their routine
• Use of protein shakes, creatine or other supplements without appropriate guidance
• Preoccupation with body fat percentage or muscle definition
• Avoidance of foods perceived as “unhealthy” taken to an extreme
• Withdrawal from activities they previously enjoyed in favour of exercise

According to the NHS guidance on eating disorders, boys and men with eating disorders are less likely to seek help, partly because of stigma and the persistent misconception that these are “girls’ illnesses.” If your son shows signs of an increasingly rigid or anxious relationship with food and exercise, take it just as seriously as you would for a daughter.

The question of whether children should use gym facilities comes up frequently in my practice. While age-appropriate exercise is beneficial, it becomes concerning when a teenager’s gym use is driven by anxiety about their body rather than enjoyment of being active.

Types of Eating Disorders in Children and Teenagers

Understanding the different types of eating disorders can help parents recognise patterns in their child’s behaviour. While the boundaries between types can blur, each has characteristic features.

Anorexia nervosa involves deliberate restriction of food intake, intense fear of gaining weight, and a distorted view of body shape or size. It carries the highest mortality rate of any mental health condition. In children, it may present as a failure to gain weight or grow at the expected rate rather than dramatic weight loss.

Bulimia nervosa involves cycles of binge eating followed by compensatory behaviours such as self-induced vomiting, laxative misuse, fasting or excessive exercise. Children with bulimia may maintain a stable weight, making it harder to detect. I often see a pattern of food disappearing from the kitchen, wrappers hidden in bedrooms, and regular bathroom visits after meals.

Binge eating disorder involves recurrent episodes of eating large quantities of food in a short period, often accompanied by feelings of shame, guilt and loss of control. Unlike bulimia, there are no regular compensatory behaviours. This condition is frequently associated with emotional distress and can contribute to the link between childhood obesity and type 2 diabetes.

Avoidant/Restrictive Food Intake Disorder (ARFID) is increasingly recognised in younger children. It involves highly restricted eating that is not driven by body image concerns but rather by sensory sensitivities, fear of choking or vomiting, or lack of interest in food. Children with ARFID may have nutritional deficiencies and growth faltering. This is different from typical fussy eating because it significantly affects the child’s health, growth or social functioning.

Other Specified Feeding or Eating Disorder (OSFED) covers presentations that do not neatly fit the above categories but are still clinically significant. A child may display features of multiple types or may not meet all the diagnostic criteria for a specific disorder. This does not mean their condition is less serious.

How to Talk to Your Child About Eating Concerns

Approaching a child you suspect may have an eating disorder is one of the most delicate conversations a parent can have. I have guided many families through this process, and the way the conversation begins can significantly influence whether your child opens up or shuts down.

Choose the right moment. Do not raise concerns during a meal or immediately after an incident. Find a quiet, private time when your child is relatively calm. A car journey can work well, as the lack of direct eye contact can feel less confrontational for teenagers.

Lead with care, not accusation. Use “I” statements rather than “you” statements. “I’ve noticed you seem quite tired lately and I’m a bit worried” is far more effective than “You’re not eating properly.” Avoid mentioning weight, calories or specific foods initially.

Listen more than you speak. Your child may deny there is a problem, and that is normal. Do not push for a confession. Simply let them know you have noticed changes, you love them, and you are there whenever they are ready to talk. Sometimes the conversation needs to happen more than once.

Avoid blame or simplistic solutions. Statements like “just eat” or “there are people starving in the world” are unhelpful and can cause your child to feel misunderstood and retreat further. Eating disorders are complex mental health conditions, not choices.

The principles around talking to your child about weight without causing harm apply here too. Language matters enormously, and even well-intentioned comments about bodies, diets or food can reinforce disordered thinking.

Getting the whole family involved in cooking together can sometimes help rebuild a more relaxed relationship with food, though this should complement rather than replace professional support.

When to Seek Professional Help

If you have noticed several of the warning signs described in this article, I strongly recommend seeking professional help sooner rather than later. You do not need a formal diagnosis to ask for support. Early intervention is one of the strongest predictors of full recovery.

Here is when I advise parents to act:

• Your child has lost weight or is not gaining weight as expected for their age
• They are regularly skipping meals or significantly restricting what they eat
• You suspect purging behaviours (vomiting, laxative use, excessive exercise)
• Their mood, social life or schoolwork has noticeably deteriorated
• They express intense distress about their body, weight or appearance
• You feel frightened or out of your depth

Your GP is the first port of call. They can assess your child’s physical health, check for nutritional deficiencies, monitor growth and refer to specialist services. In England, NHS children and young people’s eating disorder services (known as CYP-ED) are available in every area and should see urgent cases within one week and routine cases within four weeks, according to NICE guidelines on eating disorders.

If your child is in immediate danger, for example they have fainted, have a very low heart rate, or are severely dehydrated, take them to A&E.

Useful UK support services include:

• Beat Eating Disorders helpline: 0808 801 0677 (adults) or 0808 801 0711 (for young people under 18). Available 365 days a year
• NHS 111: for urgent medical advice when your GP surgery is closed
• Childline: 0800 1111, free and confidential for under-18s
• Your school: pastoral teams, school nurses and counsellors can offer valuable first-line support

Factors such as poverty and deprivation can create additional barriers to accessing support. If you are finding it difficult to get a referral or waiting times are long, Beat’s helpline team can advise on alternative routes to help.

Supporting Your Child’s Recovery at Home

Recovery from an eating disorder is rarely a straight line. There will be good days and difficult ones. As a parent, you are one of the most important people in your child’s recovery team. Here is what I have seen work well in the families I support.

Maintain regular family meals. Even if your child struggles to eat, sitting together at the table normalises mealtimes and provides structure. Keep the atmosphere as calm and conversation-focused as possible, rather than making food the centre of attention. Building positive mealtime habits benefits the whole family.

Avoid commenting on appearance. This includes positive comments like “you look so much healthier” which a child with an eating disorder may interpret as “you look bigger.” Focus praise on their qualities, efforts and interests instead.

Educate yourself. Understanding your child’s condition will help you respond with empathy rather than frustration. Books such as Help Your Teenager Beat an Eating Disorder by James Lock and Daniel Le Grange are excellent resources.

Take care of yourself. Supporting a child with an eating disorder is emotionally exhausting. Seek support for yourself through organisations like Beat’s parent and carer helpline, connect with other parents going through similar experiences, and do not neglect your own wellbeing.

Be patient but persistent. Recovery takes time. The average recovery period is typically between one and seven years, though many young people recover fully, especially with early intervention. Continue showing up, even when it feels like nothing is working.

Model a healthy relationship with food yourself. Children learn from what they see at home. Avoid labelling foods as “good” or “bad,” do not diet in front of your children, and try to speak positively about your own body. Understanding how many calories a child needs can be helpful context, but I would strongly caution against calorie counting becoming part of family life, particularly when a child is vulnerable to disordered eating.