This episode investigates how health has become a £5 billion trend on the high street. Almost nine out of ten people say they are willing to pay more for healthy choices so Sophie Morgan investigates how the big brands are interpreting this. Simon Rimmer looks at a surprising health makeover: the great British pie. He heads to Melton Mowbray to see how this traditional favourite is being challenged by new vegan and vegetarian varieties. Another big winner riding the health trend is the growing juice bar market. Sophie and nutritionist Amanda Ursell discover surprising levels of sugar, which run contrary to the healthy sounding names of the drinks. And Adam Pearson reveals the common psychological trick used on restaurant menus to make diners spend more.