This essay analyzes childhood obesity as a significant public health issue in Australia, exploring its impact on individuals, families, and the broader community. It delves into the relationship between childhood obesity and Australia's National Health Priority Area (NHPA) for cardiovascular health, highlighting the direct threat that an obese childhood population poses to this priority. Furthermore, the essay examines the connections between childhood obesity and three key social determinants of health (SDH): education, social inequality, and residential environment, illustrating how these factors contribute to the prevalence of obesity. The essay also proposes an upstream nursing approach, emphasizing the role of nurses in educating mothers and children, promoting healthy food choices, and advocating for policy changes to combat obesity. By addressing these multifaceted aspects, the essay underscores the need for comprehensive intervention strategies to mitigate the adverse effects of childhood obesity and improve public health outcomes.