We were officially told this week that obesity is as big a threat as climate change. Not long ago we were told that global warming is as big a threat as terrorism. And earlier, that terrorism is as big a threat to the British people as the Second World War. So: child obesity = global warming = terrorism = Fascism. Ergo, those crisps in your child’s lunchbox are today’s moral equivalent of the Nazis. Now do you feel guilty?