Jillian Michaels has slammed 'The Biggest Loser' for "gamifying" weight loss.

Jillian Michaels on her Biggest Loser issues

Jillian Michaels on her Biggest Loser issues

The 47-year-old fitness trainer made her name as a coach on the competition show - which saw obese individuals battle it out to lose weight and win a cash prize - and has revealed that her biggest "issue" with the show came from the elimination aspect.

She said: "Nobody should have been eliminated. That was my number one issue with the show, But the producers gamified weight loss. It was weight loss on a ticking clock."

Jillian also went on to explain that the NBC reality show - which she starred on from 2004 until 2013 - was in need of a "mental health professional" for the contestants when she was a trainer, and claimed she would frequently call her mom, - psychotherapist - for help.

She told PEOPLE: "'The Biggest Loser' needed a mental health professional. I think there was some random guy they could talk to if they needed, but these people needed deep work. When you have someone that weighs 400 lbs., that's not just an individual who likes pizza. There's a whole lot going on there emotionally. You need to deal with the demons. Otherwise, you're just gonna gain the weight back."

However, for Jillian - who was known for her aggressive demeanour towards the contestants - still believes that tough-love was the way to go.

She added: "The ones I yelled at are the ones that kept it off. You need them to feel the pain of the way they've been living. You need them to have a rock bottom moment where they're like, 'I can't take one more moment."