 Dawn Porter, embarks on an all-consuming quest to get down from a UK size 12 to a super skinny US size zero. While surviving on a diet of just 500 calories a day she tracks down the stylists, designers and agencies responsible for making thin appear not only attainable but the must get goal for any dedicated follower of fashion. Existing on meagre celebrity rations her journey takes her from the Hollywood Hills - the birthplace of zero - to the catwalks of Madrid and the home of Victoria Beckham before returning home for a showdown with some of the leading lights in the British Fashion Industry.