"Tell me what you eat, I'll tell you who you are," said Anthelme Brillat-Savarin. Today, "You are what you consume" is more apt. Barbara Krueger's ironic twist of Descartes - "I shop therefore I am" - has lost its irony. Such phrases have become commonplace descriptions of our identity in the contemporary world. In our materialistic world it seems as if there is no debate that our consumption behaviour is fused with our self-identity - shaping...