Physical similarity and twin resemblance for eating attitudes and behaviors: A test of the Equal Environments Assumption

Kelly L. Klump, Amanda Holly, William G. Iacono, Matt Mcgue, Laura E. Willson

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

The Equal Environments Assumption (EEA) in twin studies of eating pathology was investigated by examining the hypothesis that twin resemblance for eating attitudes and behaviors is affected by their degree of physical similarity. Eating attitudes and behaviors were assessed in 338 female adolescent twin pairs with a revised version of the Eating Disorder Inventory (EDI). General physical similarity as well as body size/shape similarity were assessed using ratings of color photographs, ratings of body shape, and body mass index. All physical similarity assessments were conducted blind to twin zygosity. Significant associations between physical similarity and twin similarity for eating attitudes and behaviors were not found. Mean EDI within-twin pair absolute difference scores did not differ significantly among more versus less physically-similar groups. Additionally, correlation and regression analyses failed to find a significant association between EDI absolute difference scores and physical similarity indices. The current findings provide support for the EEA in twin studies of eating attitudes and behaviors.

Original languageEnglish (US)
Pages (from-to)51-58
Number of pages8
JournalBehavior genetics
Volume30
Issue number1
DOIs
StatePublished - 2000

Keywords

  • Adolescent
  • Eating pathology
  • Equal environments assumption
  • Physical similarity
  • Twin study

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