Steven Bartlett has hired a medical doctorate graduate whose only job is to go through the health-focused episodes of Diary of a CEO before release and add notes to them. It is a permanent role in the operations of a podcast which, according to its operator, has passed one billion plays and listens.
The decision fits a logic in which a major creator behaves like a company. Content verification has become a line item in the budget of Flight Studio, the production company Bartlett owns.
What Diary of a CEO introduced
The fact-checker goes through the health-focused episodes and prepares notes that appear next to the interview. Bartlett describes this practice as the first for a major show with more than five million YouTube subscribers, one that checks guests' sources directly on screen. According to Podcast Videos reporting, it started in June 2025.
In the video version, so-called DOAC Community Notes appear on screen, clarifying or expanding claims at the moment they are made. Each episode also has an “Independent Research & Further Reading” document with peer-reviewed sources for the claims made in the interview. As an example, Podcast Videos cites a 66-page PDF of scientific sources for an episode on sleep research.
The scope of the correction has limits. According to Podcast Videos, the notes and clarifications appear mainly in the video version of the show, not necessarily in the audio. A listener on Apple or Spotify therefore may not see the same layer of context.
Where the pressure came from
Health fact-checking did not arise in a vacuum. In December 2024, BBC World Service examined fifteen health-focused episodes of the show and counted, on average, fourteen harmful claims in each one, claims that went against extensive scientific evidence.
Among the specific cases was a guest who, according to the BBC, claimed that cancer can be treated with a ketogenic diet instead of proven methods, with little or no challenge from Bartlett.
Flight Studio, the show's production company, disputed the choice of sample at the time. According to its statement, the BBC reviewed fifteen episodes out of almost four hundred at the time, which is less than 4%, and it described focusing on such a small part as “disappointing, misleading and frankly, disingenuous”.
It also argued that it offers guests “freedom of expression”, and that “progress, growth and learning comes from hearing a range of voices”.
Just under six months after that defence, the hired fact-checker and the on-screen notes arrived. The verification layer thus directly follows the dispute that prompted it.
A permanent role with costs and a process
The size of the operation gives this step a different dimension from that of a small show. Flight Story reports that Diary of a CEO has more than eight million YouTube subscribers and has released almost six hundred episodes. The operator presents it as the number one podcast in Europe and the fastest-growing podcast globally, which are marketing claims to be taken with caution.
A permanent fact-checker role means a salary, a process and responsibility built into production. A small show finds its sources between recordings. A studio the size of Flight Studio hires a person to do the same and builds a system of documents and on-screen notes around them. That is a step a company with fixed costs takes. An individual would not build such an apparatus for a single critical article.
Where this is heading and the European framework
Whether health fact-checking becomes common practice remains open. Systematic fact-checking, especially on health and scientific topics, has so far been adopted by only a few large podcasts, and according to Podcast Videos it has not yet become a broad industry standard.
For the European market, the relevant direction is platform regulation. The Digital Services Act places obligations on very large online platforms around systemic risks, including disinformation, but it targets platforms such as YouTube or Spotify, not individual content creators directly.
The verification layer at a large show therefore arises from its own decision and reputational pressure, before any specific legal framework would require it for the podcast itself. Where regulation targets the distributor, the largest creators settle credibility on their own.
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