Anorexia Nervosa

Content provided by the Faculty of the Harvard Medical School

Anorexia Nervosa

What Is It?

Anorexia nervosa is an eating disorder in which a person limits eating and weighs at least 15% less than his or her ideal weight. At least 90% of cases are in young women, but anorexia nervosa can occur in men. It rarely occurs before puberty or after age 40.

A person with this disorder fears being overweight. She may be completely convinced that she weighs too much despite what the scale shows or what other people say. To achieve or maintain leanness, she may exercise obsessively or use laxatives. Because a super-restrictive diet requires exquisite control, she may become extremely careful, inhibited and controlled in other areas of life as well. For example, she may retreat from social contacts or may perform ritual behaviors.

The term anorexia nervosa literally means having a lack of appetite, but this is misleading because people with the disorder usually have a strong appetite or actively suppress a craving for food. They diet to the point of starvation, and they may even experience pride stemming from the strength implied by such self-denial. The disorder is defined not by whether a person feels hunger but by how much weight he or she has lost.

Although anorexia nervosa appears in many cultures, it is most often diagnosed in industrialized societies, where thinness is often equated with attractiveness. It affects about 1 in 100 to 200 of all girls and women in the United States. The problem usually begins in adolescence. In girls who diet too much, the beginning of menstruation may be delayed or it may stop once it has started.

The cause of anorexia nervosa is not clear. It is likely a combination of inherited (genetic) vulnerability and environmental factors. Based on decades of research, experts see the disorder as having many elements:

• A variant of depression or anxiety. Anorexia, depression, anxiety and obsessive-compulsive disorder tend to run in families, and many people with anorexia nervosa have symptoms of depression or obsessive-compulsive disorder.

• Associated with personality traits. People with anorexia nervosa are often given to compulsiveness and perfectionism. The eating may be an extension of, or a strong expression of, those traits.

• Triggered by fears about becoming an adult. One fear may be related to new sexual feelings and activities that begin in adolescence. Sometimes the illness is triggered by a life event linked to normal development, such as moving away from home.

• A response to environmental pressures. Cultural influences, including images from television and film and pressure from peers, leave the impression that thin is best. But culture is only part of the story. The illness was reported hundreds of years ago when social pressures were quite different.

• A way to cope with difficult family relationships. Family difficulties can provoke the illness, but their importance may have been overemphasized in the past. Sometimes family problems develop after the disease has started, because a person with anorexia nervosa may test the patience of those she lives with. People with the disorder describe a feeling of power and control over others through their dieting.

In advanced stages of the illness, the dieting is hard to reverse. At that point, hunger may disappear completely and the pursuit of thinness becomes a way of life. Starvation causes medical complications of its own, such as thyroid problems, anemia and joint pains. Extreme dieting can lead to death in the most severe cases, most commonly because of an irregular heartbeat caused by an imbalance of the salts in the bloodstream.

There are two subtypes of anorexia nervosa, a restricting type and a binging/purging type. A person with the restricting type of anorexia diets, fasts and exercises. People with the binging/purging type eat large quantities of food, then vomit. Many people go back and forth between these two patterns.

Symptoms

Symptoms of anorexia nervosa include:

• Significant weight loss (more than 15% of ideal body weight)

• Extreme dieting, including skipping meals or extended fasting

• Obsessions about food and fears about eating in public

• Obsessive exercise

• Use of laxatives

• Binging and purging

• Distorted self-image; feeling fat despite being thin

• Self-esteem that depends on weight and appearance

• Amenorrhea (stopping of menstrual periods or a delay of starting menstruation in young teens)

• Skin dryness or flakiness

• Brittle nails and hair

• Anemia

• Swelling in feet and ankles

• Intolerance to cold

• Hypothermia (low body temperature)

• Poor concentration

• Dehydration

• Fainting

Diagnosis

A mental health professional, such as a psychiatrist, psychologist or social worker, can diagnose anorexia nervosa based on the history reported by the patient and the family. The person with anorexia may not report symptoms reliably, so reports from family members may be necessary to make a diagnosis. A pediatrician or primary care physician may make the diagnosis, too.

The health care professional will ask about the person's attitudes toward weight, food and body image, and he or she will check for lower than normal body weight and the physical signs of starvation, which include:

• Low blood pressure

• Anemia

• Dry skin

• Enlarged salivary glands

• Lanugo, a very fine type of body hair

• The stopping of periods in a woman

• Dental problems, because stomach acids can damage teeth if the person purges regularly

Some clinicians find it helpful to use screening tests. Examples are the Eating Disorders Inventory and the Eating Aptitudes Test.

As part of the evaluation, the clinician may explore whether the person has other problems that need treatment, such as depression, anxiety, obsessive-compulsive disorder, personality disorders or substance abuse. It is common for people with anorexia nervosa to have symptoms of depression, including low mood, social withdrawal, irritability, poor sleep and diminished interest in sex. People with the binging/purging type of anorexia nervosa are more likely to have mood ups and downs, have problems with impulse control, and abuse alcohol and drugs.

Medical evaluation includes blood work to investigate whether poor nutrition has caused anemia (low red blood cell count), altered liver and kidney function, and abnormal levels of blood chemicals, such as low potassium.

A doctor also needs to make sure there are no other medical problems that might be causing weight loss, such as inflammatory bowel disease, cancer or hormonal problems. People with those illnesses, however, do not usually have a problem with their body image.

Expected Duration

Duration varies. Some people with anorexia nervosa have a single, relatively brief episode after experiencing an isolated stressful event. For others, the problem becomes chronic (long-lasting) and the person's condition gradually deteriorates. Many people start by restricting food, then later binge and purge. Recent research has shown that the majority of cases go away by late adolescence. But a significant number of people do have continuing problems with diet and body image into adulthood, even though the severity of the symptoms is likely to be less.

Prevention

There is no way to prevent anorexia nervosa. It's helpful to detect the problem as early as possible, because early treatment can shorten the course of the illness.

Treatment

The first goal is to make sure the person with anorexia nervosa is not in medical danger. Clinicians aim to help the person achieve a minimum healthy weight, but there is not one most recommended way to accomplish this goal. A priority is to correct any problems with body fluids and salts. Doctors evaluate the person's heart, liver and kidney functioning and provide necessary medical support. Hospitalization may be necessary in the most severe cases, but most treatment is done in an outpatient setting.

Treatment often requires coordinating help from a number of professionals. Comprehensive eating disorders programs are efficient because they bring all the treatment elements together.

One major task is helping the person with anorexia nervosa recognize the illness and participate in treatment. Education is key, but it should be noted that patients with anorexia nervosa are -- in many ways -- already experts in their illness. Therefore, the team of people providing treatment have to try not to behave in a way that could be perceived as patronizing or scolding.

Anorexia nervosa is best treated with a combination of psychotherapy, medication, and medical and nutritional supervision.

Although a number of specialized psychotherapy approaches have been studied, there is some evidence that supportive psychotherapy and sympathetic clinical management are just as -- if not more -- helpful. Elements include education, care and support. Praise, reassurance and advice can help sustain a positive therapeutic relationship that encourages adherence to treatment.

Health care professionals try to define the problem in a way the person can accept, then work with the person toward common goals.

Once the person acknowledges the problem, a variety of therapy techniques can be helpful. A nutritionist can plan a healthy eating program that promotes slow weight gain. Cognitive behavior therapy encourages the person to recognize flawed thoughts about body image, food and dieting, and helps to control anxiety about eating. Family therapy may be important, both to support and educate family members and to examine negative interactions in the family. For example, family members can be taught to avoid unproductive power struggles about food.

Later, when symptoms are under better control, the person with anorexia nervosa may want to understand the meaning of the symptoms, including how they may have affected important relationships, limited emotional growth and altered self-concept. It may also be possible to look at what problems may have set off the eating disorder in the first place.

Although antidepressant medications can improve any associated mood problems, they usually do not hasten weight gain (unless depression is in part causing the weight loss). No medication is known to make a person with this disorder want to eat or gain weight. Nonetheless, antidepressants and other medications may provide relief for people who have symptoms of depression, anxiety or obsessive-compulsive disorder.

A person's thinking about food can become distorted enough that it is considered psychotic, and in those cases, treatment may include an antipsychotic medication. Some of the newer antipsychotic drugs, such as olanzapine (Zyprexa), have weight gain as a side effect. In this case, the side effect may be a benefit, but a person with anorexia nervosa may also not tolerate it.

When To Call a Professional

Contact a mental health professional, a pediatrician or a primary care physician if you have a question about food restriction, feelings of sadness or anxiety, or persistent problems with body image. A family member may be the first to notice such problems and should contact a health care professional on behalf of the person having trouble. Severe weight loss or starvation can become a medical emergency, so early treatment is desirable.

Prognosis

Many people have mild forms of anorexia nervosa and are open to treatment. These people will respond well, particularly when a variety of approaches are combined. For people who have lost a great deal of weight and have medical complications, aggressive care can reverse a downward course. There is a significant risk of death for people hospitalized for medical complications of anorexia nervosa, especially when they are very resistant to treatment. However, the majority of people with anorexia nervosa either improve significantly or have a full recovery.

Additional Info

National Association of Anorexia Nervosa and Associated Disorders P.O. Box 7 Highland Park, IL 60035 Phone: 847-831-3438 http://www.anad.org/

American Psychiatric Association 1000 Wilson Blvd. Suite 1825 Arlington, VA 22209-3901 Toll-Free: 1-888-357-7924 Web site: http://www.psych.org/ Public information site: http://www.healthyminds.org/

American Psychological Association 750 First St., NE Washington, DC 20002-4242 Phone: 202-336-5510 Toll-Free: 1-800-374-2721 TTY: 202-336-6123 http://www.apa.org/

National Institute of Child Health and Human Development Building 31, Room 2A32 MSC 2425 31 Center Drive Bethesda, MD 20892-2425 Toll-Free: 1-800-370-2943 TTY: 1-888-320-6942 Fax: 301-496-7101 http://www.nichd.nih.gov/

Last updated:	March 09, 2009