This leader's manual contains the materials required to present a school-based weight management curriculum that may be offered both in school and outside the school setting for middle-school adolescents. The first section contains instructor information regarding the following topics: need for the program; program objectives; timeline and procedures; implementation suggestions; general format options; evaluation; involvement of parents, schools, and communities; and recruitment of participants. Presented next are session plans for each of the program's 20 sessions, which are devoted to the following topics: introduction and setting goals; keeping track of food intake and food groups and exchanges; making food choices and following dietary guidelines; self-esteem and body image; exercise and energy balance; changing behavior and habits; eating for competition; food supplements; fad diets; self-esteem boosters; breakfast; fruits and vegetables; snacks; fat; fiber; meat; fast food; calcium; planning meals with one's family and considering nutrient density; and program wrap-up. Each session plan contains some or all of the following: objectives; list of materials; notes to leaders; learning activities; evaluation criteria/activities; references/resources; ideas for other activities; and student handouts. Appended are knowledge and attitude tests and parent and student letters. (MN)