Kathryn Thomas admitted she finds it "tough" to be healthy when she's on the road presenting Operation Transformation.
The 36-year-old is known for her love of fitness, and said being organised is key to eating healthily.
"We're giving the advice to the leaders telling them not to 'dashboard dine' and then the crew have to stop for petrol and we do it," she told the Herald. "I'm traveling next week revealing the leaders, so I'll be making chia balls and protein bars beforehand.
"Then it's about healthy choices in hotels in the evening.
"Once you're organised, there's never enough of an excuse," she added.
The Operation Transformation experts will also be returning this year with Dr Ciara Kelly, Karl Henry, Aoife Hearne and Dr Eddie Murphy ready to guide the leaders along their weight-loss journey.
Twenty finalists were chosen from thousands of applications, and the five leaders will be revealed on the Ray D'Arcy Show from next Tuesday.
Those hoping to make it to the final five include Damien Dillon, from Birr, Co Offaly, who wants to change his lifestyle after beating Non-Hodgkin's Lymphoma 10 years ago and having another scare last year.
"I'm 19st 8lbs and my oncologist told me I needed to have a complete lifestyle change," he said. "I have an 11-year-old son and I want to set a good example for him.
"On my 43rd birthday, I will go to have my all-clear scan, and on that day I would love to be three stone lighter."
Mum-of-one Lucy Dillon (24), from Kells, Co Meath, currently weighs 17st 4lbs and doesn't want her one-year-old daughter Molly to go down the same path.
"Weight has always been an issue for me for as long as I can remember," she said.
"I've had a rough few years, my mum Terese passed away and I had post-natal depression. I'm just constantly eating with stress and I want to change that," she added.
Ballycullen native Louise Butler Byrne (28) has warned her boyfriend not to propose until she loses some weight.
"I'm 18st 8lbs and I'm sick and tired of my weight holding me back - I want to change my life," she said.
Kathryn will be speaking at the Image Networking Breakfast at the Marker Hotel on Monday, November 16.
Tickets are still available via www.image.ie.