Overview

What are eating disorders?

Each year, millions of people in the United States are affected by serious and sometimes life-threatening eating disorders. The vast majority -- more than 90 percent -- of those afflicted with eating disorders are adolescent and young adult women. One reason that women in this age group are particularly vulnerable to eating disorders is their tendency to go on strict diets to achieve an "ideal" figure. Researchers have found that such stringent dieting can play a key role in triggering eating disorders.

Approximately 1 percent of adolescent girls develop anorexia nervosa, a dangerous condition in which they can literally starve themselves to death. Another 2-3 percent of young women develop bulimia nervosa, a destructive pattern of excessive overeating followed by vomiting or other "purging" behaviors to control their weight. These eating disorders also occur in men and older women, but much less frequently.

The consequences of eating disorders can be severe. For example, one in ten cases of anorexia nervosa leads to death from starvation, cardiac arrest, other medical complications, or suicide. Fortunately, increasing awareness of the dangers of eating disorders -- sparked by medical studies and extensive media coverage of the illness -- has led many people to seek help. Nevertheless, some people with eating disorders refuse to admit that they have a problem and do not get treatment. Family members and friends can help recognize the problem and encourage the person to seek treatment.

What are the medical complications of eating disorders?

Medical complications can frequently be a result of eating disorders. Individuals with eating disorders who use drugs to stimulate vomiting, bowel movements, or urination may be in considerable danger, because this practice increases the risk of heart failure.

In patients with anorexia, starvation can damage vital organs such as the brain and heart. To protect itself, the body shifts into "slow gear": monthly menstrual periods stop, breathing pulse and blood pressure rates drop, and thyroid function slows. Nails and hair become brittle; the skin dries, yellows, and becomes covered with soft hair called lanugo. Excessive thirst and frequent urination may occur. Dehydration contributes to constipation, and reduced body fat leads to lowered body temperature and the inability to withstand cold.

Mild anemia, swollen joints, reduced muscle mass, and light-headedness also commonly occur in anorexia. If the disorder becomes severe, patients may lose calcium from their bones, making them brittle and prone to breakage. They may also experience irregular heart rhythms and heart failure. In some patients, the brain shrinks, causing personality changes. Fortunately, this condition can be reversed when normal weight is reestablished.

Scientists have found that many patients with anorexia also suffer from other psychiatric illnesses. While the majority have co-occurring clinical depression, others suffer from anxiety, personality or substance abuse disorders, and many are at risk for suicide. Obsessive-compulsive disorder (OCD), an illness characterized by repetitive thoughts and behaviors, can also accompany anorexia. Individuals with anorexia are typically compliant in personality but may have sudden outbursts of hostility and anger or become socially withdrawn.

Bulimia nervosa patients -- even those of normal weight -- can severely damage their bodies by frequent binge eating and purging. In rare instances, binge eating causes the stomach to rupture; purging may result in heart failure due to loss of vital minerals such as potassium. Vomiting causes other less deadly, but serious, problems -- the acid in vomit wears down the outer layer of the teeth and can cause scarring on the backs of hands when fingers are pushed down the throat to induce vomiting. Further, the esophagus becomes inflamed and glands near the cheeks become swollen. As in anorexia, bulimia may lead to irregular menstrual periods. Interest in sex may also diminish.

Some individuals with bulimia struggle with addictions including abuse of drugs and alcohol, and compulsive stealing. Like individuals with anorexia, many people with bulimia suffer from clinical depression, anxiety, OCD, and other psychiatric illnesses. These problems, combined with their impulsive tendencies, place them at higher risk for suicidal behavior.

People with binge eating disorder are usually overweight so they are prone to the serious medical problems associated with obesity, such as high cholesterol, high blood pressure, and diabetes. Obese individuals also have a higher risk for gallbladder disease, heart disease, and some types of cancer. Individuals with binge eating disorder also have high rates of co-occurring psychiatric illnesses -- especially depression.

What causes eating disorders?

In trying to understand the causes of eating disorders, scientists have studied the personalities, genetics, environments, and biochemistry of people with these illnesses. As is often the case, the more that is learned, the more complex the roots of eating disorders appear.