The UNICEF report: Feeding Profit: How food environments are failing children. The UNICEF press release: Obesity exceeds underweight for the first time among school-age children and adolescents globally – UNICEF: One in 10 children worldwide living with obesity. Exposure to the marketing of ultra-processed foods found to be widespread. the prevalence of underweight among children aged 5-19 has declined since 2000, from nearly 13 per cent to 9.2 per cent, while obesity rates have increased from 3 per cent to 9.4 per cent.