Highlights
A cluster-randomised controlled trial involving 12 public schools in Chandigarh, India, has demonstrated that a structured behaviour change intervention can significantly reduce the intake of ultra-processed foods (UPFs) among adolescents. The primary findings indicate a reduction in UPF energy intake by 1062 Kcal/day and processed food intake by 274 Kcal/day. The intervention, grounded in the PRECEDE-PROCEED model, proved both feasible and engaging, though it showed limited efficacy in altering parental dietary habits through a single session.