United Kingdom, Aug. 16 -- Jade Thirlwall doesn't think she should have been allowed to compete on The X Factor because of her mental health.

The former Little Mix singer had battled anorexia from the age of 13 and her audition for the reality show in 2011 came just a few months after she had been discharged from hospital, and not only does she think a "proper" assessment by producers would have found her unsuitable for the demands of the programme, she believes there were other finalists who should also have been rejected.

She told The Guardian newspaper: "In retrospect, if the show had done a proper mental health assessment, then they wouldn't have let me on. [The psych test] was very surface.

"Judging by some of the people in that X...