In the final programme of this three-part series, journalist Jacques Peretti investigates what is and isn’t healthy, with some surprising results. He also examines how product marketing can seduce consumers into buying supposed healthy foods such as muesli and juices, both of which can be loaded with sugar. He speaks with Simon Wright, who worked as an organic consultant for Sainsbury’s in the 1990s, who explains how the food industry cashed in on the public’s concerns around salmonella, BSE and GM crops. He also questions whether things have really changed when high-profile events such as the Olympic Games are sponsored by drink and fast-food companies.