Sugar is on trial in this programme. Widely blamed for all manner of health issues beyond rotten teeth and expanding waistlines, the team investigate whether sugar really deserves such a lousy health reputation. Jem sets out to make some pure, white, granulated sugar of his own, while Maggie meets a surprise victim of fatty liver disease. Maggie also discovers how sugar is being used to preserve life-saving vaccines, while Liz explores the power sugar has to switch on our brains.