Children's Hospital Colorado
The Eating Disorder Treatment Program

Anorexia in Children and Teens

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What is anorexia? 

While there is no single cause of anorexia nervosa, risk often starts when a child or teenager begins to significantly limit their food intake. Anorexia nervosa occurs when a child loses a significant amount of weight but still believes they are not thin enough or does not see the danger of their weight loss. They may even feel they have more weight to lose, so they continue to restrict food intake and may also increase exercise to speed up weight loss. 

Anorexia nervosa can develop at any age, but it most often begins around puberty. Without intervention, the consequences of anorexia can be tragic. Untreated patients may suffer from slowed heart rate, increasing the risk for potentially fatal heart problems, as well as potentially permanent brain tissue loss. Girls can stop having periods, and the resulting lack of estrogen can lead to osteoporosis (weak bones), which occurs in 50% of patients with anorexia. Almost every organ system is affected by malnutrition caused by anorexia, including the brain, heart, liver, kidneys, bone marrow, skin and reproductive system.  

The emotional complications of an eating disorder can be just as devastating as the physical complications. Relationships with family and friends often suffer as the child begins to avoid eating with others or resists efforts by others to help them. They often feel isolated and depressed. These conditions can lead to suicidality, the leading cause of death in people who suffer from eating disorders. 

In addition to medical treatment, the family can be the first line of defense in fighting eating disorders. Learn more about family-based treatment (FBT) for eating disorders.    

What causes anorexia? 

Eating disorders do not have a single cause. They can develop from a combination of biological, psychological and social factors. Genetic vulnerability and family history of eating disorders or mood disorders can increase risk. Psychological factors such as perfectionism, low self-esteem, depression, anxiety and difficulty coping with intense emotions may be contributors. 

Who gets anorexia? 

Anorexia affects both boys and girls. People with anorexia often tend to be perfectionists or overachievers, excelling in school and engaging in myriad extracurricular activities.   

Sometimes, preoccupation with weight starts in response to a stressful event, such as the loss of a friend or problems in the family. It may begin as a way to deal with general pressures such as growing up, fitting in socially, doing well in school or keeping everyone in the family happy.   

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