Fern quit the ITV daytime show, which she hosted alongside Phillip Schofield, in 2009.
The presenter explained that she had decided to leave This Morning for “lots of reasons” but insisted it had “nothing to do with money”.
Speaking to talkRADIO, Fern said: “It was all gastric band-gate. It ruffled a few feathers, and I think perhaps I became a bit of a liability to ITV. I really don’t know.
“But I know that the day I decided to leave – and I’m not going to get into this now – something happened that morning and I thought, ‘I’m done’ and ITV went, ‘Thanks very much. Goodbye’.”