The Salt Path tells the story of how its author Raynor Winn and her husband Moth walked over 600 miles, days after Moth was diagnosed with a rare and terminal brain disease. That walk, the story goes, stalled the progress of the condition known as corticobasal degeneration. It's a story that gave hope to patients like John, facing the same cruel diagnosis. But John's doctor says exercise cannot impact CBD – and that he's never heard of a patient surviving longer than 12 years. He's one of 10 experts who have expressed surprise at the presentation of Moth's condition in the best-selling memoir. And for John, hope has now turned to anger.
Reporter: Chloe Hadjimatheou
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Video journalists: Alice Anderson & Sam Hockley
Editor: Tom Larkin