James Dunn weighed 32-stone last year and was guilty of eating takeaways four times per week, eating pasties for lunch and drinking sugary drinks whenever he had the chance.
But the embarrassment of being kicked off an Alton Towers ride due to his size led the 28-year-old to change his lifestyle.
"Then about four times a week I'd have takeaways, I'd eat whatever was convenient, and it would always be in huge portions that just weren't normal. I'd eat pizzas, Chinese, Indian, but not a portion that a normal person would eat. They'd always be massive portions."
The experience at the theme park energised him to alter his lifestyle and to eat a healthier diet.
He said: "We had a big staff day out at Alton Towers, and I tried to get on a ride and the bar wouldn't fasten. Two people tried to help fasten it but it wouldn't and they said I was going to have to get off.
"It was mortifying, it was so embarassing. There was tons of people watching and I just couldn't ever face going back again."
He was also selected to star in Davina McCall's Make My Body Better television series. As part of the show he was challenged to get his weight down to 17 stone to be a jockey in a professional horse race, his weight-loss story was captured on camera.
James now plans to help educate children on the dangers of childhood obesity and help them to make healthier choices by visiting schools in his native Liverpool.
He said: "I don't want to tell people to get fat and then go out and get weight-loss surgery. It's not about that, because prevention is definitely better than cure.
"I'd always been overweight even as a child and I think the best way to combat it is to tackle it while you're young. We need to educate them at a young age."
Good on him.
Source : The LAD Bible