{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T23:09:55Z","timestamp":1792192195489,"version":"4.4.0"},"reference-count":56,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2012,10,3]],"date-time":"2012-10-03T00:00:00Z","timestamp":1349222400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Intl J Eating Disorders"],"published-print":{"date-parts":[[2012,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective:<\/jats:title><jats:p>Current research on the etiology of thin\u2010ideal internalization focuses on psychosocial influences (e.g., media exposure). The possibility that genetic influences also account for variance in thin\u2010ideal internalization has never been directly examined. This study used a twin design to estimate genetic effects on thin\u2010ideal internalization and examine if environmental influences are primarily shared or nonshared in origin.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method:<\/jats:title><jats:p>Participants were 343 postpubertal female twins (ages: 12\u201322 years; <jats:italic>M<\/jats:italic> = 17.61) from the Michigan State University Twin Registry. Thin\u2010ideal internalization was assessed using the Sociocultural Attitudes toward Appearance Questionnaire\u20103.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>Twin modeling suggested significant additive genetic and nonshared environmental influences on thin\u2010ideal internalization. Shared environmental influences were small and non\u2010significant.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion:<\/jats:title><jats:p>Although prior research focused on psychosocial factors, genetic influences on thin\u2010ideal 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\u2010ideal internalization. \u00a9 2012 by Wiley Periodicals, Inc. 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