Oliver, whose School Dinners and Ministry Of Food TV series have seen him campaign for better food in schools, homes and the workplace, said that lack of knowledge about cooking had an "exponential" impact on the nation's health. "The exponential effect of passing on bad solutions to feeding the family is dramatic," he said. But he added: "I believe that radical change is quite easy. I have witnessed it across the country, across the classes. It is incredibly emotional to see the life of a family changed through nuggets of very small amounts of good information.