At the age of 14, Rob Richman thought he was ugly "from head to toe".
By the time he was 15, he weighed less than 5st, had been admitted to a private psychiatric hospital and was being force-fed through a tube in his nose.
Parents, friends and the Southgate Jewish community were baffled as to why an intelligent, polite boy from a middle-class traditional family in north London had starved himself to the point that he was too frail to walk.