Professor Tim Spector was one of the “winners” of the Covid era: his ZOE symptom tracker app accrued millions of users during the pandemic

Now he has pivoted back to his true passion, gut health, and taken many of his followers with him. Endorsed by celebrities such as Davina McCall and Carrie Johnson, the new version of the ZOE app promises a personalised nutrition plan and comes with a glucose blood monitor usually used by diabetics. It is proving hugely popular, with over 100,000 subscribers paying up to £600 in their first year — and a further 300,000 on the waiting list.

It boasts all the hallmarks of a scientific endeavour, with endorsements by world-leading experts and numerous studies. But how convincing are its claims?

Deborah Cohen, Newsnight’s former Health Editor, and Margaret McCartney, a GP, undertook a forensic investigation for UnHerd and found that ZOE’s scientific foundations aren’t as strong as they would have you think…

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