The main objective of this study was to evaluate the effect of group-based reality therapy on loneliness and mental image of body in female high school students with eating disorder in district 13 of Tehran province. The design of this research was experimental with pre-test and post-test. The research population included all female high school students in district 13 of Tehran province who were studying in the academic year of 2016-2017. A cluster randomized sampling method was used in this study. First, one district was randomly selected among 13 districts. Then, one school was selected as the sample among the schools of this district. First, the eat-26 questionnaire was distributed among all school students and 30 students with eating disorder were identified. They were randomly divided into two experimental and control groups. Then, the loneliness questionnaire and the body image concern questionnaire were given for both groups. Experimental group received eight sessions of reality therapy, while control group received no intervention. After the completion of group-based reality therapy sessions for the experimental group, both groups were post-tested (loneliness and body image). The results were analyzed using multivariate covariance test. The results showed that group-based reality therapy significantly reduced the loneliness and body image concern.
