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Certain beverages contribute energy, protein, vitamins, and minerals. North American adolescents have shifted their beverage intake from predominantly milk to predominantly sugary beverages. Intake of these sugary beverages, in sufficient quantity, may increase the risk of bone fractures, may contribute to obesity, and may lead to tooth decay. This study evaluated the effectiveness of a school-nutrition education program (Fluids Used Effectively for Living) on nutrition knowledge, attitude, and self-reported behavior of grade 9 students in Saskatchewan, Canada. Two classes of grade 9 students, 1 (n = 33) in a high school in Saskatoon (n = 33) and 1 (n = 24) in a large high school in Prince Albert, Saskatchewan, received the peer educator intervention. Two other classes in the 2 cities (n = 24 and n = 24, respectively) were controls. Six sessions of Fluids Used Effectively for Living nutrition education were delivered by using 2 peer educator models (multiple and single), and the intervention was delivered in a 45-minute weekly class session over a 6-week period. After the intervention, students in these 2 peer educator classes decreased their sugary beverage intake significantly, which was sustained for 3 months. Students in the control self-taught class increased their juice intake at the end of the year. The significant decrease of juice and sugary beverage intakes in the single model peer educator class disappeared after Bonferroni correction. Carbonated sugary beverage intake of students in the control self-taught classes declined, but it was not sustainable at the 3-month follow-up. A peer educator school-based nutrition education approach can lead to a decrease in sugary beverage intake in high school children.