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Fat Preference: A Novel Model of Eating Behavior in Rats
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Published on: June 27, 2014

Genetic and environmental influences on thin-ideal internalization.

Jessica L Suisman1, Shannon M O'Connor, Steffanie Sperry

  • 1Department of Psychology, Michigan State University, East Lansing, MI 48824, USA.

The International Journal of Eating Disorders
|October 5, 2012
PubMed
Summary

Genetic factors significantly influence thin-ideal internalization, challenging the focus on psychosocial factors alone. Environmental influences are primarily nonshared, not shared, impacting body image development.

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Area of Science:

  • Behavioral Genetics
  • Developmental Psychology
  • Eating Disorders Research

Background:

  • Existing research on thin-ideal internalization primarily explores psychosocial factors like media exposure.
  • The role of genetic influences in the development of thin-ideal internalization has not been previously investigated.
  • Understanding the etiological origins is crucial for developing effective prevention and intervention strategies.

Purpose of the Study:

  • To estimate the heritability of thin-ideal internalization using a twin design.
  • To differentiate between shared and nonshared environmental influences on thin-ideal internalization.
  • To examine the genetic and environmental contributions to body image concerns.

Main Methods:

  • A sample of 343 postpubertal female twins (ages 12-22) was recruited from the Michigan State University Twin Registry.
  • Thin-ideal internalization was measured using the Sociocultural Attitudes toward Appearance Questionnaire-3 (SATAQ-3).
  • Twin modeling analyses were employed to decompose variance into genetic and environmental components.

Main Results:

  • Twin modeling revealed significant additive genetic influences on thin-ideal internalization.
  • Nonshared environmental factors also played a significant role in accounting for individual differences.
  • Shared environmental influences were found to be small and statistically non-significant.

Conclusions:

  • Genetic factors contribute significantly to thin-ideal internalization, with moderate effect sizes.
  • Contrary to expectations, shared environmental influences have a minimal impact.
  • Future research should explore the interaction between genetic predispositions and nonshared environmental factors in shaping body image.