An investigation has found that Steven Bartlett’s Diary of a CEO podcast has been spreading harmful health misinformation. Out of 15 episodes focused on health, the podcast contained an average of 14 harmful claims, according to the BBC World Service. Experts have criticized Bartlett for allowing controversial health claims without proper challenge, which undermines trust in conventional medicine.

Notable claims made on the podcast include the idea that a ketogenic diet can cure cancer and that COVID-19 was an engineered weapon. Experts warn that spreading unscientific content like this can lead people away from evidence-based medicine and potentially harm their health. Bartlett's production company defended the podcast, stating that it values freedom of expression and believes in learning from a range of voices despite the criticisms.