Childhood Obesity Intervention Study

"1. School-level policies Students will not be allowed to drink sugar-sweetened beverage or eat unhealthy snacks in schools and drinking water will be advocated.~2. Monitoring of students' weight and height Students will be monitored their weight and height monthly.~3. Promotion of physical activity Students will be required to perform at least 60 minutes of moderate to vigorous physical activity each day in school and increase their physical activity outside school (reaching 30 minutes per weekday and one hour per weekend day).~4. Health education activities Health education activities will be provided for students (10 sessions, 40 minutes per session, 2-3 weeks once), parents and school teachers.~5. The mobile application The mobile application will disseminate health education knowledge among students, parents and teachers, monitor and provide feedback of students' BMI status and diet and physical activity behaviors."