This brief discusses diet, exercise, body image, and weight and also provides information for practitioners on how to measure these factors among youth in their program. It summarizes (1) what it means to be overweight; (2) what are body image and eating disorders; (3) what to do if you suspect that someone in your program is suffering from an eating disorder; and (4) how to assess weight issues among adolescents in out-of-school-time programs. Additional resources for programs on healthy diet and eating disorders are also provided. (Contains 14 endnotes.)