They say you are what you eat, but sure if we knew what was in half that unnaturally tasty food we gobble up we'd probably never eat again... That said, we're still fascinated by the lengths producers go to when getting the finished product to our shop shelves. Tonight Jimmy Doherty finds out how they decaffeinate coffee in Brazil, while Kate Quilton discovers the truth about chewing gum, and Matt Tebbutt takes a closer look at the calorie content of diet bread. We're just glad it's on the telly after dinner...