This investigative piece, part of the BBC Horizon series, airs on Thursday January 
19th at 9pm on BBC2.
Dr Giles Yeo investigates the latest diet craze and social media sensation – clean eating. Giles cooks with Ella Mills, the Instagram entrepreneur behind Deliciously Ella, one of the most popular brands associated with clean eating, and examines how far her plant-based cooking is based on science. He sifts through the claims of other clean eating advocates and looks inside a Californian ranch where cancer patients have been treated with alkaline food to see what can happen when pseudoscience is taken to a shocking extreme.