A search of databases (PubMed, EMBASE and Cochrane CENTRAL) and references of published studies (from inception until May 2012) was conducted. Eligible studies were randomized trials enrolling children 6 to 12 years old and assessing the impact of educational interventions during 6 months or longer on waist circumference, body mass index (BMI), blood pressure and lipid profile to prevent or treat childhood obesity. Calculations were performed using a random effects method and pooled-effect estimates were obtained using the final values.
Of 22.852 articles retrieved, 26 trials (23.617 participants) were included. There were no differences in outcomes assessed in prevention studies. However, in treatment studies, educational interventions were associated with a significant reduction in waist circumference [? 3.21 cm (95 % CI ? 6.34, ? 0.07)], BMI [? 0.86 kg/m2 (95 % CI ? 1.59, ? 0.14)] and diastolic blood pressure [? 3.68 mmHg (95 % CI ? 5.48, ? 1.88)].
Educational interventions are effective in treatment, but not prevention, of childhood obesity and its consequences.