“…The longitudinal design allowed us to control for BMI measured contemporaneously with EDI, ensuring that we are observing correlations between earlier BMI and later eating disorder traits, not simply the effect of the high correlation of BMI with itself over time. In the typical developmental course of female eating disorders, symptoms usually arise in adolescence (Herpertz-Dahlmann et al, 2015;Micali et al, 2015;Micali, Ploubidis, De Stavola, Simonoff, & Treasure, 2014) and during the same period, most adolescents experience physical and emotional changes (Chulani & Gordon, 2014). Previous twin studies have explored, for example, timing of menstruation, pubertal development, and female hormonal levels in relation to eating disorder traits (Baker, Thornton, Bulik, Kendler, & Lichtenstein, 2012;Klump, 2013;Klump et al, 2012;Klump, Keel, Sisk, & Burt, 2010).…”