A prevention program for disordered eating was evaluated. Grade 9 girls (N = 173) were assigned to a prevention intervention (n = 114) or a no-treatment control group (n = 59). High-risk, but not low-risk, girls reported significant improvements in body dissatisfaction, drive for thinness, and interoceptive awareness at post-intervention. These changes were not maintained at three-month follow-up, although nonsignificant trends were still apparent for high-risk girls. Individual session analyses indicated that the program was rated positively overall. The importance of assessing effects of programs on different recipient types is discussed.