 Children aged 6 to 17 years with overweight and obesity based on the WHO growth criteria will be randomly assigned to receive GNN or placebo maltodextrin both at a dose of 3 gday for 3 months and will be followed up for 3 months. Prior to the intervention, all children will receive dietetic advice, and they will be encouraged to engage in physical activity. The primary outcome measure will be the BMI-for-age z-score difference between the groups at the end of the intervention. 