When Gina Gough was rushed into hospital in agony, with severe abdominal pains and jaundice, doctors initially suspected hepatitis and put her to an isolation ward. In fact, the 22-year-old's condition was the result of a three-year diet that consisted almost entirely of crisps. She was eating up to 15 bags a day and went into hospital weighing 14st. Her case demonstrates the potential dangers of a junk-food diet and follows last year's controversial film Super Size Me, in which a documentary-maker ate nothing but McDonald's food for a month and monitored the subsequent deterioration in his health. It is...