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Siân A McLean,1,2 Hannah K Jarman,2 Rachel F Rodgers3,41Institute for Health and Sport, Victoria University, Melbourne, Victoria, Australia; 2School of Psychology and Public Health, La Trobe University, Melbourne, Victoria, Australia; 3Department of Psychiatric Emergency & Acute Care, Lapeyronie Hospital, Chru Montpellier, Montpellier, France; 4Department of Applied Psychology, Northeastern University, Boston, MA, USAAbstract: Social media use has grown rapidly in recent years, with one of the most popular activities for young people being the taking, sharing, and browsing of digital self-photos, known as selfies. However, research has only recently begun to investigate selfies, and little is known about selfie practices in adolescents, or the associations between these practices and well-being and body confidence. This paper aimed to address this gap and conduct a narrative review of selfie practices and the relationships with well-being and body confidence in adolescents. No studies were found reporting on selfie practices and these relationships among children. However, taking selfies appears to be common practice among adolescents, although posting selfies online is less frequent. The studies reviewed indicate that certain aspects of selfie behaviors may be more problematic than others. Specifically, viewing selfies online appears to have a negative impact on adolescents’ well-being and body confidence, at least in the short term in experimental contexts. Moreover, seeking and placing importance on feedback from others may also be a harmful aspect of selfie practices. Finally, consistent with research examining social media, social comparison has been identified in this emerging body of research as a potential mechanism which links selfie engagement to well-being and body confidence. To further advance understanding of the correlates and effects of selfie practices, research with children and with boys, and research focused on a wider range of indicators of well-being, is needed. Most importantly, prospective research is required to examine the directionality of links between selfie practices and well-being and body confidence.Keywords: selfies, social media, adolescents, well-being, body image, social comparison

Background: The extent and implications of muscle building protein supplement use among adolescents is relatively unknown. We aim to present the prevalence of protein powder, creatine, and anabolic steroid use in a sample of 14-16 year-old boys in Australia, and the predictors of use, and intentions to use protein powder. Methods: Data were obtained from questionnaires with N=237 Australian adolescent boys aged 14-16 years from one independent boy’s school in Melbourne Australia. Hierarchical linear and logistic regressions were used to determine the predictors of intentions to use, and actual use of protein powder, respectively. Results: 49.8% of boys reported current use of, and 62% intended to use protein powder; 8.4% used creatine, and 4.2% used anabolic steroids. Higher levels of participation in drive for muscularity, weight training, and playing a greater number of sports were significant predictors of higher current use and higher intentions to use protein powder, but age, BMI, body esteem, and ethnicity were not. Conclusions: Prevalence of muscle building supplement use was relatively high among this adolescent population. This research has implications for intervention and prevention programs to educate young boys about muscle building supplements to reduce negative physical and psychological health effects of their use.