Although cross-sectional, these findings suggest the importance of social media activities for body-related and eating concerns as well as potential avenues for targeted social-media-based intervention.

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Aim: Negative body image increases the risk of engaging in unhealthy dieting and disordered eating patterns. This review evaluated the impact of habitual social media engagement or exposure to image-related content on body image and food choices in healthy young adults (18-30 years). Methods: A systematic search of six databases of observational literature published 2005-2019, was conducted (PROSPERO Registration No. CRD42016036588).Inclusion criteria were: studies reporting social media engagement (posting, liking, commenting) or exposure to image-related content in healthy young adults. Outcomes were: body image (satisfaction or dissatisfaction) and food choices (healthy eating, dieting/restricting, overeating/binging). Two authors independently screened, coded and evaluated studies for methodological quality. Results: Thirty studies were identified (n = 11 125 participants). Quantitative analysis (n = 26) identified social media engagement or exposure to image-related content was associated with higher body dissatisfaction, dieting/restricting food, overeating, and choosing healthy foods. Qualitative analysis (n = 4) identified five themes: (i) social media encourages comparison between users, (ii) comparisons heighten feelings about the body, (iii) young adults modify their appearance to portray a perceived ideal image, (iv) young adults are aware of social media's impact on body image and food choices, however, (v) external validation via social media [Correction added on 14 October 2019, after first online publication: The affiliations of authors Siân McLean and Linda Brennan have been corrected].

Background: Body dissatisfaction is associated with impairment in women's quality of life (QoL). To date, research has not examined the relationship between body dissatisfaction and men's QoL, or sex differences in this relationship. Methods:A community sample of 966 males and 1,031 females living in Australia provided information about their body dissatisfaction, mental health and physical health-related QoL, and eating disorder symptoms. Data were analysed using three hierarchical multiple regressions and interactions between body dissatisfaction and sex were examined.Results: For both sexes, increasing levels of body dissatisfaction were associated with poorer mental and physical health-related QoL and greater psychological distress. The adverse associations between body dissatisfaction and mental health-related QoL, and between body dissatisfaction and psychological distress, were more pronounced for males. Conclusion:High levels of body dissatisfaction may threaten the psychological and physical wellbeing of both men and women. Body dissatisfaction appears to be a public health problem, distinct from the eating disorders and other adverse psychological phenomena for which body dissatisfaction is commonly discussed as a risk factor. Males, historically understudied and underrepresented in body image research, warrant increased empirical attention.