"Similarly, individuals genetically predisposed to eating disorder symptomatology such as thin-ideal internalization might also actively choose to affiliate with peers who place a similar high value on weight and appearance. One potential example of this form of active selection could be the decision to join a sorority (particularly for European-American women). European-American sorority members report high levels of eating disorder symptomatology, including weight preoccupation, drive for thinness, and body dissatisfaction. A longitudinal study found that sorority and non-sorority members did not differ on three measures of disordered eating (EDI Drive for Thinness, Body Dissatisfaction, and Bulimia) at Time 1 and Time 2 (first and second year of undergraduate, respectively). However, by Time 3 (third year of undergraduate), non-members’ drive for thinness scores had decreased, while members’ scores on this measure remained roughly the same, and this difference was statistically significant. Thus, the authors concluded that characteristics of the sorority environment could contribute to the persistence of a higher degree of drive for thinness. Although this study did not include a measure of actual or putative genetic vulnerability to eating disorders, it is plausible to speculate that an environment that promotes the maintenance of eating disordered characteristics would be particularly problematic for a genetically vulnerable individual."