Anorexia in Teens: Signs, Causes & Treatment at EatWell

Anorexia

Teen anorexia can start quietly, with a teen who skips breakfast more often, swaps family dinners for “eating later,” or starts talking about food in a way that feels off.

Many parents sense something has changed long before they can name it.

If you’re worried about your teen, or you’re a teen wondering about your own eating, this guide walks through the signs of anorexia in teens, what causes it, and what treatment looks like. We’ll also share how EatWell Health Centre supports teens and their families in Toronto and virtually across Canada.

Need immediate assistance? Text us: 416-907-9013 or fill out our form to start a conversation.

What Is Anorexia Nervosa in Teens?

Anorexia nervosa is an eating disorder where a person restricts what they eat and feels an intense fear of gaining weight. Teens with anorexia often see their body differently from how others see it, and their sense of worth can become tied to food, weight, or control.

Anorexia nervosa in teens is serious because their bodies are still growing. Restriction during adolescence can affect bone development, hormones, heart health, and growth in ways that may last into adulthood. Early support makes a real difference.

Anorexia doesn’t have one look. Some teens lose a lot of weight. Others stay in a weight range that seems “normal” while still restricting heavily. This second pattern is often called atypical anorexia, and it carries many of the same health risks.

What Are the Early Signs of Anorexia in Teens?

The early signs of anorexia in teens are easy to miss because they can look like normal teenage behaviour. A teen who wants to “eat healthier” or join a new sport usually isn’t cause for concern. What matters is when those changes become rigid, secretive, or start pulling your teen away from the things they used to enjoy.

Some early signs to watch for:

Cutting out whole food groups or labelling foods as “good” and “bad”
Skipping meals or finding reasons to eat alone
New interest in calories, ingredients, or nutrition labels
Exercising more, even when tired, sick, or injured
Wearing baggy clothes or layering up
Becoming upset when plans involve food, like parties or eating out
Talking about their body more often, usually in a negative way

One sign on its own may not mean much. A pattern of several, especially if they’re growing over time, is worth paying attention to.

What Are the Signs and Symptoms of Anorexia in Teens?

As anorexia continues, the signs and symptoms of anorexia in teens tend to show up across the body, mood, and daily life.

Physical symptoms of anorexia in teens

Weight loss, or not gaining weight during a growth stage
Feeling cold most of the time
Dizziness or fainting
Tiredness and low energy
Dry skin, brittle nails, or thinning hair
Fine, soft hair growing on the body
Missed or stopped periods
Stomach pain, bloating, or constipation
Trouble sleeping

Emotional and behavioural signs

Irritability, anxiety, or low mood, especially around meals
Pulling away from friends and family
Rigid routines around food and exercise
Strong reactions when routines are interrupted
Perfectionism at school, in sports, or with appearance
Denying that anything is wrong

Teens with anorexia often feel a lot of shame and work hard to hide what’s going on. That’s part of why parents can feel caught off guard. For a closer look at how these symptoms show up, our post on symptoms of anorexia goes deeper.

When to get medical help right away

Some symptoms mean your teen needs medical care now. Go to the emergency department or call 911 if your teen faints, has chest pain, a very slow or irregular heartbeat, confusion, or seems too weak to get through the day. Anorexia affects the heart, and these signs should never wait for a regular appointment.

What Causes Anorexia in Teens?

Parents often ask what causes anorexia in teens, and many quietly wonder if they did something wrong. Anorexia develops from a mix of factors, and no single thing causes it. Parents don’t cause eating disorders.

Common reasons for anorexia in teens include:

Genetics and temperament

Anorexia tends to run in families. Teens who are naturally anxious, sensitive, perfectionistic, or very driven may be more likely to develop it.

Puberty and body changes

Bodies change a lot during the teen years. For some teens, those changes feel scary or out of control, and restricting food can start to feel like a way to manage them.

Dieting and weight comments

Many cases of anorexia start with a diet, a “clean eating” plan, or a comment about weight from a coach, peer, or family member. What begins as a small change can grow into something much harder to stop.

Social media and pressure

Teens see a steady stream of images and messages about bodies, fitness, and food. For a teen who’s already vulnerable, this can feed comparison and the urge to change their body.

Stress, anxiety, and life changes

Moving schools, family stress, bullying, a breakup, or pressure to perform can all play a part. For some teens, anorexia becomes a way to cope with feelings that seem too big. Mood can also be part of the picture, which we cover in our post on whether depression can cause an eating disorder.

Sports and activities

Teens in sports or activities that focus on weight, shape, or appearance, like dance, gymnastics, running, figure skating, or wrestling, can face extra pressure around food and body size.

To learn more about how these factors work together, read our post on what causes eating disorders.

Do Boys Get Anorexia Too?

They do. Anorexia in teen boys is often missed because people expect it to look a certain way. Boys may focus more on being lean or muscular, and their restriction can be hidden behind sports or fitness goals. Our post on anorexia in men covers how it can show up differently.

How Can I Talk to My Teen About Anorexia?

This is often the hardest part for parents. You want to help, and you’re scared of saying the wrong thing.

A few things that tend to help:

Pick a calm, private time away from meals.
Share what you’ve noticed and how it makes you feel, using “I” statements.
Keep the focus on how they’re doing, and leave weight, size, and food out of it.
Expect some denial or anger. Stay steady, and come back to it later.
Let them know you’re on their side and that getting help isn’t a punishment.

Our posts on how to help a child with an eating disorder and what not to say to someone with an eating disorder have more guidance for these conversations.

What Is the Treatment for Anorexia in Teens?

Treatment for anorexia in teens works best when it addresses both the body and the mind, and when families are part of the process. Most teens are treated as outpatients, which means they live at home and go to school while attending regular appointments.

Nutrition support

A registered dietitian who specialises in eating disorders helps your teen restore regular eating, rebuild hunger and fullness cues, and work through fear foods at a pace that feels manageable. When weight has dropped quickly or health is at risk, structured refeeding may be needed to stabilise the body safely.

Therapy

An eating disorder therapist helps your teen understand what’s driving the anorexia and build skills to cope with urges, anxiety, and difficult emotions. Approaches may include CBT-E, DBT-informed therapy, and emotion-focused work.

Family involvement

Parents and caregivers play a big role in recovery. Family support can help with meals at home, emotional safety, and staying connected when things feel hard. Many parents also need support of their own while helping a teen through treatment.

Medical monitoring

Your teen’s family doctor or paediatrician should be involved to check heart rate, blood pressure, bloodwork, and growth. If your teen’s physical health is at serious risk, a higher level of care like day treatment or hospital care may be needed.

How long does treatment take?

Recovery from anorexia takes time, and it rarely moves in a straight line. Many teens are in treatment for a year or more. Setbacks happen, and they’re part of the process. Teens who get help early and stay in treatment have a strong chance of full recovery.

How EatWell Treats Anorexia in Teens

At EatWell, we offer outpatient anorexia treatment for adolescents and adults, with in-person care in Toronto and virtual care across Canada.

Every teen starts with an intake with our Clinical Director, Natalie Mulligan, who stays involved throughout treatment. From there, we pair your teen with an eating disorder therapist and a registered dietitian who work together as a team. Most teens start with one therapy session and one nutrition session each week, and we adjust the plan as their needs change.

For teens living at home, we meet with parents before treatment begins and agree together on how you’ll be kept in the loop. Your teen stays at the centre of their care, and you get the information you need to support them.

We also offer:

Emotion-focused family therapy, a program that gives parents practical tools to support recovery, handle hard moments at home, and manage their own stress along the way.
An outpatient refeeding program for teens with rapid weight loss or higher medical risk who can still be safely treated as outpatients.
Hospital waitlist support for families waiting on a hospital program, so your teen gets structured care in the meantime.

You can learn more about our full approach on our eating disorder treatment page.

Frequently Asked Questions

At what age does anorexia usually start?

Anorexia most often begins in the early to mid teen years, though it can start in childhood or adulthood too. Because it often begins during puberty, parents may notice changes around the time their teen starts high school.

Can a teen have anorexia without being underweight?

Absolutely. Many teens with anorexia stay in what looks like an average weight range while still restricting heavily. This is sometimes called atypical anorexia, and it can be just as harmful to the body. Weight alone is never a reliable way to tell if someone is struggling.

Is my teen’s dieting normal or a sign of anorexia?

Look at how rigid, secretive, and distressing it has become. Normal changes in eating are flexible and don’t take over a teen’s life. If your teen is anxious around food, avoiding social plans, or losing weight they can’t afford to lose, it’s worth talking to a professional. Our post: Do I have an eating disorder? can help teens reflect on their own patterns.

What if my teen refuses treatment?

This is very common, since the illness itself often resists help. Stay connected, keep the conversation open, and speak with your teen’s doctor, especially if their health is at risk. Getting support for yourself through family therapy can also help you know how to respond.

Can teens fully recover from anorexia?

Full recovery is possible, and it happens often. Early treatment, specialised care, and family support all improve the chances of getting all the way better.

Do we need a referral to start treatment at EatWell?

No referral is needed, and there’s no waitlist. You can book a free phone consult to talk through your concerns and figure out if outpatient care is the right fit.

Getting Help for Anorexia in Teens in Toronto and Across Canada

Watching your teen struggle with food is scary, and knowing where to start can feel overwhelming. The most important step is reaching out. The earlier your teen gets support, the easier it is to interrupt anorexia before it takes a deeper hold.

EatWell works with teens and families in Toronto and virtually across Canada. Our team understands how anorexia shows up in young people, and we’ll help your family find a clear path forward. Book a free consultation with our team, or send us a message to start the conversation. Future you will be so proud.