For the first time, there are more children in the world who are obese than underweight, according to a major study by children's charity Unicef. Around one in 10 of those aged between five and 19 years old - around 188 million children and young people - are now thought to be affected by obesity. Researchers blame a shift from traditional diets to ones heavily reliant on ultra-processed foods that are relatively cheap and high in calories. Unicef, an agency of the United Nations, is urging