In South Africa, adolescent health is a critical public health concern, with obesity rates increasing over time. The study employed surveys administered to adolescents (n=500) and schools' records for data collection. Statistical analysis was conducted using linear regression models. A significant positive correlation ($r = 0.42$, $p < 0.001$) between participation in school nutrition programmes and improved body mass index (BMI). School-based nutrition programmes appear effective in promoting healthier weight among adolescents, warranting wider implementation. Further research should explore long-term outcomes and cost-effectiveness of such interventions.