This study relates to a previous (approved) proposal regarding the investigation of eating disorder behaviors in ALSPAC by childhood and adolescent gender expression and adolescent report of sexual orientation. We have additionally proposed the collection for new data concerning current gender expression and sexual orientation, as well as engagement in a wider array of appearance and physical performance-motivated behaviors than has previously been examined in ALSPAC (see accompanying QPF). The collection of new ALSPAC data and analysis of new and existing ALSPAC data will be covered by funding from K01DA034753 (PI: Dr. Calzo) and an R01 from NIH that Dr. Calzo will apply for in October 2015. Analyses of ALPSAC data will complement analyses of data from the Growing Up Today Study and Nurses' Health Study III Men's Cohort in the United States, thus providing a cross-cultural analysis of the comorbidity and costs of appearance and physical performance-motivated behaviors in men's lives from adolescence through middle age.