It's all out war as round-the-clock snacker Emma Cain goes head to head with Robert Musgrove, who can't be bothered to eat.
Dr Christian shows lager-guzzling Emma just what her favourite tipple is doing to her body.
In America's fattest town he visits an after-school scheme that aims to help combat childhood obesity.
And Emma Woolf travels to Holland to investigate online therapy in the treatment of eating disorders.
