Adolescents' Eating Disorders Can Shift over Time

By London, Susan | Clinical Psychiatry News, August 2008 | Go to article overview

Adolescents' Eating Disorders Can Shift over Time


London, Susan, Clinical Psychiatry News


SEATTLE--Sizable proportions of adolescents progress along a spectrum of eating-disordered behavior over time, highlighting the importance of early detection and intervention, Diann M. Ackard, Ph.D., said at an international conference sponsored by the Academy for Eating Disorders.

"The percentage of disordered eating behaviors in epidemiological samples of youth has been actually pretty varied," said Dr. Ackard, a psychologist in private practice in Golden Valley, Minn., explaining part of the study's rationale. In addition, she noted, data also suggest that some young people who report eating disorder symptoms worsen over time, developing partial- or full-syndrome disorders.

Dr. Ackard and her colleagues assessed the stability of eating disorder classifications among a population-based sample of adolescents in Project EAT (Eating Among Teens). In the project, the same adolescents completed surveys about eating behaviors and body image in 1999 and again in 2004, and the survey items were mapped onto DSM-IV criteria.

Analyses were based on 2,516 adolescents in middle school or high school at the first assessment, Dr. Ackard reported at the conference, which was cosponsored by the University of New Mexico. Those in middle school were a mean age of 12.8 years and those in high school were a mean age of 15.8 years in 1999. Fifty-five percent were female.

At the first assessment, 10% of adolescents met full-threshold criteria for an eating disorder (anorexia nervosa, bulimia nervosa, or binge eating), 39% had some subthreshold symptoms (compensatory behaviors or body image disturbance), and 50% were asymptomatic.

Five years later, considerable flux in the eating disorder groups was evident, Dr. Ackard reported. Among female adolescents who were asymptomatic at the first assessment, 63% remained so at follow-up--but 36% had developed symptoms and 1% had developed full clinical disorders. About 61% of those who initially had some symptoms still had them; another 37% had improved, becoming asymptomatic, but 3% had worsened and developed clinical disorders.

Only 10% of female adolescents who initially had clinical disorders still had them; fully 70% had a reduction in severity to some symptoms and 20% were now symptom free. "We are not sure as to whether that was a treatment-seeking sample or if they naturally remitted," Dr. …

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