This briefing paper addresses the critical public health issue of childhood obesity in the United Kingdom (UK) and the United States (US). It begins with an overview of childhood obesity rates in both countries, highlighting the prevalence of overweight and obesity among children. The paper then critically reviews the National Child Measurement Programme in the UK and the National Health and Nutrition Examination Survey in the US, examining their roles in measuring and identifying childhood obesity. Finally, the report provides a critical analysis of the effectiveness of the Mind, Exercise, Nutrition, Do It (MEND) public health program in both the UK and the US, evaluating its impact on addressing diet-related diseases and improving the health outcomes of children. The paper utilizes data and research from various sources, including government reports and academic studies, to support its findings and conclusions. This report is designed to inform the local health authority on the current state of childhood obesity and the effectiveness of intervention programs.