A NORTH Ipswich father is two-thirds the man he used to be.
William Briese has lost more than 80 kilograms after doctors confirmed he may not live to see his three children grow up.
The 37-year-old chef made the life-changing decision at 230kg more than a year and a half ago to cut the fat.
Now he is studying a diploma in diet and nutrition with his eye on becoming a personal trainer to encourage others battling the bulge.
"If I kept going on the path I was on, I wouldn't live very long," Mr Briese said. "My doctor said I would end up having a heart attack or heart disease and diabetes.
"I want to see my kids grow up and be able to do activities with them. Now I can muck around with them in the backyard without getting breathless, which is great."
Mr Briese, who trains at Jetts Booval up to four times a week, had struggled with his weight since he was a teenager.
"Basically when I hit high school, I put on more and more weight. As I got older I got lazier and it snowballed from there," he said.
"It was hard to get out of bed in the morning; even walking to the mailbox I was short of breath. It was hard on my back, and knees and ankles ached."
In 2012, he underwent lap-band surgery and committed to change his eating and exercising habits.
The chef of 17 years said he now had a new outlook on life.
"I can get around a lot easier, I'm not puffed and I have more energy," he said. "My blood pressure is perfect ... my dietician calls me a gym junkie."
Mr Briese hopes to lose another 50kg before the end of the year.
"I want to help others with their diet and nutrition," he said. "I've had go through the struggle."