One in five under-16s in the UK is obese and it is a growing problem. As a nation we are fatter than ever and because of obesity, experts reckon children are likely to die before their parents.

But what is it like to be big and how hard is it to diet? Reporters Charlotte Ashton and Anthony Baxter meet the UK teenagers who are trying to lose weight, and speak to Jack who weighed 20 stone when he was 16. Show less