X Factor singer Mary Byrne, beauty expert Triona McCarthy, chef Gary O'Hanlon, social media influencer James Patrice and singer Kayleigh Cullinan are starting their Celebrity Operation Transformation plan today.

You can join in and follow the leaders and their food plan on the OT site here  ahead of the show starting on RTÉ One on Wednesday September 6, 2017.

The five leaders’ starting weights are as follows: -

1. Mary Byrne –
Starting Weight: 17st 13lbs.

Appearing on Saturday Night with Miriam, Mary revealed that she has always struggled with her weight: "I have battled with my weight all my life and when my mother died in 1995 I kind of went down a very dark road and the weight just piled on", she explained. 

2. Triona McCarthy
Starting Weight: 12st 9.5lbs.

Speaking on The Ray D'Arcy Show on RTÉ Radio 1, McCarthy said: "The amount of people who have gotten in contact... they felt that they could really relate to the piece I wrote because they're not obese as such... actually maybe I am obese?... but there is just that stone, they want to be healthier".

3. Gary O'Hanlon
Starting Weight: 15st 3.5lbs.

Chef Gary O'Hanlon spoke of having an unhealthy structure to his day, he couldn't say when he last had a breakfast: "Chefs would rarely eat full meals, you're just dabbling having wee tastes here and there" he explained.

4. James Patrice -
Starting Weight: 19st .5lbs.

5. Kayleigh Cullinan
Starting Weight: 20st 11lbs.

How did Kayleigh feel when she got the call from the Celebrity Operation Transformation team? "I was ecstatic, I'm the biggest of the group....I'm really looking forward to it", she told Ray D'Arcy. 

James Patrice popped in to talk to Nicky & Jenny on RTÉ 2fm.

Watch the celebs on Saturday Night with Miriam here.