The politics and meaning of 'alternative' foods: Laura Miller, Associate Professor of Sociology at Brandeis University, discusses her study of 'Natural Foods'. How did what was once a culturally marginal set of ideas evolve from associations with spirituality and bohemian lifestyles to being a mainstream consumer choice? She's joined by Ton Hayward, food writer and broadcaster. Also, Harry West, Professor of Anthropology at the University of Exeter, considers the 'authenticity' of artisanal and heritage foods. Producer: Jayne Egerton.