In the study，five Philadelphia schools introduced a School Nutrition Policy Initiative (SNPI) that included

　　Getting rid of less healthy snacks and sodas available at school or replacing them with water，low-fat milk or 100 percent fruit juice.

　　Training teachers to teach about nutrition and giving students 50 hours of nutrition education during the year.

　　Rewarding kids with raffle (抽彩) tickets to win prizes when they practice healthy snacking.

　　Encouraging parents and students to purchase healthy snacks outside of school，and challenging the kids to eat better and be more physically active.

　　Over the course of two years，researchers followed students in grades 4 to 6 at these schools and five control schools，measuring the weight，height and physical activity of all 1,349 students before and after the study period.Only 7.5 percents of students in schools with the new nutrition policy became overweight，compared with 15 percent of students who became overweight in the control schools.The nutrition policy appeared even more effective for black students.

　　Despite the success，researchers expressed concerns that some students still gained weight.They suggested that stronger interventions (干预) should be needed，such as increasing physical education time and changing the nutrition environment outside of schools.The researchers also recommend prevention programs begin even earlier than fourth grade.

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