This report, prepared for the University of Sunderland in London, critically analyzes the effectiveness of school-based interventions in preventing childhood obesity in the UK. It begins by defining childhood obesity, outlining its prevalence, and highlighting the need for immediate preventive actions. The report investigates the determinants of childhood obesity, including genetic, social, and behavioral factors, and reviews the literature on school-based interventions. The methodology involves a comprehensive literature review, including an analysis of existing research and studies, the selection of relevant data sources, and the application of inclusion and exclusion criteria to ensure the validity of the findings. The report examines the effectiveness of various interventions and presents the results, discussing the implications of the findings and offering recommendations for future research and policy. It also summarizes the key findings, conclusions, and limitations of the research, providing a comprehensive overview of the topic.