Jimmy Doherty investigates the new sugar tax, and finds out how manufacturers have responded by reducing the sugar in some of our favourite brands. But what exactly are they adding to keep the flavours the same? Kate Quilton asks why some sliced bread falls apart when it's buttered, while other sliced loaves stay firm. Kingsmill reveal the secret baker's trick, and it's all about bubbles! Meanwhile, Matt Tebbutt has noticed that strange white stripes are appearing more and more often on chicken breasts, and finds out why in Italy.