The Dragons' Den star is facing questions after guests on the podcast put forward unfounded health claims, for example that cancer can be treated by following a keto diet.
Health experts warned that the assertions could have serious consequences for people who were severely ill and discouraged listeners from following some of the advice.
On Friday, an investigation by the BBC World Service found that guests were faced with little or no challenge.
Experts told the BBC that failing to question these disproven claims was dangerous because it created a distrust of conventional medicine.
In an analysis of 15 health-related podcast episodes, the broadcaster found each contained an average of 14 harmful health claims that went against extensive scientific evidence.
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Real Madrid take aim at Uefa in bid to revive Super League
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Athletics has funding cut by £1.75m for LA Games buildup
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