Abstract
Objective: Current research on the etiology of thin-ideal internalization focuses on psychosocial influences (e.g., media exposure). The possibility that genetic influences also account for variance in thin-ideal internalization has never been directly examined. This study used a twin design to estimate genetic effects on thin-ideal internalization and examine if environmental influences are primarily shared or nonshared in origin. Method: Participants were 343 postpubertal female twins (ages: 12-22 years; M = 17.61) from the Michigan State University Twin Registry. Thin-ideal internalization was assessed using the Sociocultural Attitudes toward Appearance Questionnaire-3. Results: Twin modeling suggested significant additive genetic and nonshared environmental influences on thin-ideal internalization. Shared environmental influences were small and non-significant. Discussion: Although prior research focused on psychosocial factors, genetic influences on thin-ideal internalization were significant and moderate in magnitude. Research is needed to investigate possible interplay between genetic and nonshared environmental factors in the development of thin-ideal internalization. © 2012 by Wiley Periodicals, Inc. (Int J Eat Disord 2012)
| Original language | English |
|---|---|
| Pages (from-to) | 942-948 |
| Number of pages | 7 |
| Journal | International Journal of Eating Disorders |
| Volume | 45 |
| Issue number | 8 |
| DOIs | |
| State | Published - Dec 2012 |
ASJC Scopus subject areas
- Psychiatry and Mental health
Keywords
- Tripartite Model
- body image
- disordered eating
- heritability
- internalization
- thin-ideal
- twin study
