The TV presenter told Heat that the "fair" and "brutal" world of the Games has cast the reality talent show in a new light.
"I watched The X Factor last Saturday. It just felt different," she said.
"After the Olympics, we now really admire real people, achieving things that have taken a lot of training and dedication, and some hint of sacrifice."
She added: "They win or they lose and it's a fair world, but it's quite brutal.
"And I think we all just watched The X Factor a little more cynically than before and it didn't feel right.
"It's like suddenly the chocolate you eat is fake. You know, it just doesn't taste like chocolate any more."
Radio 1 DJ Huw Stephens has said that a legacy of the Olympics was the proof that "hard work and dedication makes real superstars".
Record-breaking Olympian Chris Hoy has admitted that he is "not a huge fan of reality TV", adding: "Real life is not about instant gratification or overnight fame."
Fellow London 2012 medallists Tom Daley, Mo Farah and Jessica Ennis have reportedly signed on to star in an 'Olympics Week' on this year's X Factor live shows.
London 2012 photo gallery - best bits:
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