Junk food advertising could be banned on the London Underground network as part of plans to tackle the capital’s “ticking time-bomb” of childhood obesity. London has one of the highest child overweight and obesity rates in Europe, with almost 40% of children aged 10 and 11 overweight or obese. London Mayor Sadiq Khan has said the proposals would also extend to the capital’s buses and bus shelters, as well as the London Overground. • Subscribe to ITV News on YouTube: http://bit.ly/2lOHmNj • Get breaking news and more stories at http://www.itv.com/news Follow ITV News on Facebook: https://www.facebook.com/itvnews/ Follow ITV News on Twitter: https://twitter.com/itvnews Follow ITV News on Instagram: https://www.instagram.com/itvnews/