Diary of a CEO host Steven Bartlett is amplifying harmful health misinformation on his number-one ranked podcast, a BBC investigation has found.    Recent claims from guests - including that cancer can be treated by following a keto diet, rather than proven treatments - were allowed by the Dragons’ Den star with little or no challenge.    Experts have told us failing to question these disproven claims is dangerous because it creates a distrust of conventional medicine.   Tap the link in @BBCNews’s bio to read more from our investigation.    #BBCNews