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DALLAS -- Andy Axsom is on a mission to undo what he said he did to himself for so many years.

I'd have a hamburger for lunch, and cheeseburger for dinner, Axsom said.

Eighteen months ago, Axsom was 385 pounds. His body mass index (BMI) was over 50 percent, which qualified him as morbidly obese.

And then in August, he made a change.

It was just one of those conscious choices that I need to be a better example for my family, my friends, Axsom said.

It was then he made his goal to run the Metro PCS Dallas Marathon. So he cut out fast food, and found people who can help him; People like Heinz Schwarzkopf, a former college runner and now a first-year medical student.

My job is to just make the weight loss fun and make it attainable, Schwarzkopf said.

As Axsom laces up, he wouldn't call this fun, but he does call it rewarding.

People would come and tell me, 'Hey, you're doing a great job,' and say you're an inspiration, and I say, 'Hey, I'm just trying to get in better shape!' Axsom said.

Now you can't keep him out of the gym. Some days he does three-a-days and sticks to a strict diet.

Eighteen months later, he's dropped down to 250 pounds. That's eight pounds per month. He's done a 5k, a 10k, and even a half marathon. But the finish line on Sunday will be something to remember.

If you put your mind to it, you can absolutely accomplish it, Axsom said.

He said when the race is over, he's going to indulge a little bit with a beer and a cheeseburger. After that, it's back to the diet.

E-mail jpanicker@wfaa.com

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