This gender inclusive, dissonance-based body image program was created from focus group feedback. Based on the Body Project, the program retains key dissonance activities while expanding the inclusivity focus (e.g., expanding the gender focus, exploring diversity within appearance ideals, critically discussing the impact of limited diversity representation in cultural appearance norms).

Around 10% of content from the previous trial was modified to form the current intervention. Changes focused on enhancing diversity-focused content. College students with body image content interest completed two days (16 hours) of training on the program manual, group management, and conducting inclusive conversations. Post training, students self-assessed their facilitation readiness and were evaluated by two trainers on facilitation expertise. Peer leaders with sufficient expertise were invited to facilitate EVERYbody Project groups.

Video + expressive writing groups were facilitated by a peer leader following a detailed script. This intervention was designed as an active but low-dissonance comparison condition. Participants viewed two separate documentary movies related to gender and/or appearance-related pressures (one during each session): (1) The Illusionists, and (2) The Mask You Live In. Participants engaged in a brief (10 minute) reflective writing exercise after each film. In order to keep dissonance low, participants were told that their reflections would not be shared with anyone and they were not turned in.

Peer facilitators received brief (1 hour) training on the video group manual.

Brief behavioral group intervention (4 hours across two meetings)

Eating disorder symptoms were assessed with an 8-item version of the Eating Disorders Examination Questionnaire (EDEQ). The 8-item version of the EDEQ yields a Global score (average across all 8 items).

The Satisfaction and Dissatisfaction with Body Parts Scale (SDBPS) assessed satisfaction and dissatisfaction with nine parts of the body that are commonly endorsed as concerning (e.g., stomach, thighs, hips). The average score was used in this study (average across all 9 items).

The two Internalization subscales of the Sociocultural Attitudes Toward Appearance Questionnaire-4 (SATAQ-4) assess internalized cultural messages surrounding appearance and attractiveness. The two internalization subscales were combined for this study (average across all 10 items), following prior research. This survey was assessed at all outcome time points (Survey 1, 2, and 3), plus midway through the intervention (following Session 1 of the program).

Negative affect was assessed with 20 items from the fear, guilt, and sadness subscales of the Positive and Negative Affect Schedule-Revised (PANAS-X). The average of all 20 items was used in this study.

A series of feedback questions were used to gauge satisfaction with the EVERYbody Project after the second session (based on prior research). These questions included four Likert scale items about enjoyment (e.g., "I enjoyed the EVERYbody Project") rated from 1 (strongly disagree) to 5 (strongly agree) as well as open-ended questions (e.g., "Was any part of the EVERYbody Project particularly helpful/useful? If so, which part and why?") These questions were administered as a part of the post-intervention survey (Survey 2).

At post-intervention (Survey 2) and three-month follow-up (Survey 3), three questions gauged application of information learned in the program (e.g., "How often do think about the things you learned in the EVERYbody Project?" rated on a scale from 1 (not at all) to 5 (all the time).