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Anorexia nervosa: evidence for a genetic basis
A J Holland1, N Sicotte, J Treasure
1Department of Psychiatry, Institute of Psychiatry, London, U.K.
Journal of Psychosomatic Research
|January 1, 1988
Summary
Genetic factors significantly contribute to anorexia nervosa (AN) risk. A twin and family study found high concordance rates in monozygotic twins, suggesting a strong genetic influence on developing AN.
Area of Science:
- Psychiatric Genetics
- Eating Disorders Research
Background:
- Anorexia nervosa (AN) is a complex eating disorder with significant heritability.
- Understanding the genetic and environmental factors contributing to AN etiology is crucial for effective interventions.
Purpose of the Study:
- To investigate the role of genetic factors in the etiology of anorexia nervosa.
- To quantify the heritability of anorexia nervosa using twin and family study data.
Main Methods:
- Conducted a combined twin and family study involving 25 monozygotic (MZ) and 20 dizygotic (DZ) female twin pairs.
- Utilized the Eating Disorders Questionnaire (EDI) and clinical data (weight loss, amenorrhea) for analysis.
- Applied established techniques of psychiatric genetics to analyze twin and family data.
Main Results:
- Concordance for anorexia nervosa was 56% in MZ twin pairs and 5% in DZ twin pairs.
- Approximately 5% of other female first-degree relatives also had a history of anorexia nervosa.
- Genetic factors may account for up to 80% of the variance in liability to anorexia nervosa.
Conclusions:
- Findings strongly support the hypothesis that genetic factors play a very significant role in the etiology of anorexia nervosa.
- A proposed genetic/environmental model accounts for the observed features of anorexia nervosa.
- Further research into the genetics of weight and appetite control is warranted.