The presenter, 40, could be bidding farewell to the jungle in the coming days, as this year's campmates go head-to-head in a string of battles to decide whether they'll face the first public vote.
The unidentified person had been competing in the Swansea Ironman 70.3 race in South Wales on Sunday when safety officials noticed them struggling in the water.
Until just two years ago, Marcus Wendling, a 48-year-old small business owner and Ironman champion, had never been sick. But in 2023, he noticed blood in his stool.