Study: Eating Disorders in Teens Are Common
Researchers Say Anorexia, Bulimia, and Binge Eating Affect Boys and Girls
March 7, 2011 -- Eating disorders in teens are common, often occur with other psychiatric problems including suicidal thoughts, and don't just affect girls, according to a new study.
''Eating disorders are a serious public health problem," says researcher Kathleen Merikangas, PhD, senior investigator at the intramural research program at the National Institute of Mental Health.
In the last decade or so, Merikangas tells WebMD, ''it seems to me there has not been much research attention" on the topic.
With her colleagues, she examined data from a national representative sample of U.S. adolescents, known as the National Comorbidity Survey Replication Adolescent Supplement. The sample included face-to-face interviews with more than 10,000 teens ages 13 to 18.
The study is published online in the Archives of General Psychiatry.
Prevalence of Eating Disorders in Teens
Teens were asked if they had ever had an eating disorder and if they had had one within the past 12 months. Included were anorexia nervosa, bulimia, and binge eating disorder.
Anorexia nervosa is marked by self-starvation and excessive weight loss. Bulimia involves a cycle of bingeing and then compensating for overeating by self-inducted vomiting or other behaviors. Binge eating disorder is marked by recurrent binge eating without compensating behaviors.
For lifetime prevalence, the researchers found:
- For anorexia, about 0.3% of the teens were affected (55,000). For bulimia, about 0.9% (170,000).
- For binge eating, about 1.6% (300,000).
When the researchers looked at 12-month prevalence, they found lower rates, with 0.2% of teens affected with anorexia, 0.6% for bulimia and 0.9% for binge eating.
The sample was cross-sectional, a kind of snapshot in time, says Merikangas. But in her own review of the medical literature, comparing those findings with the new data, she says that anorexia has remained fairly stable since 1990, while bulimia and binge eating have both increased about twofold.
The researchers also looked at what is known as ''subthreshold'' eating disorders. "We also discovered a wide range of people who have some of these behaviors but didn't reach the threshold of either severity, duration, or frequency that we have somewhat arbitrarily applied [to the definition of each]."
They had enough information to identify ''subthreshold'' anorexia and binge eating, finding about 3.3% of the teens had one of these.