Since 2004, viewers have watched 15 seasons of success stories on "The Biggest Loser" -- but what happened after the cameras stopped rolling? "Oprah: Where Are They Now?" followed up with some of the early contestants to see how their lives have changed since leaving the ranch.

During season 4, former pageant girl Julie Hadden came in second place by dropping 97 pounds. In the years since then, Julie battled infertility but finally got pregnant at age 40. Now she's a happy stay-at-home mother of three, as well as an author and public speaker.

"I have always been known for my greatest weakness, which is being overweight," Hadden says. "But I believe that we are all given trials and circumstances not just for us but so we can teach other people, and that is what I plan on doing in my future."

In season 2, Matt Hoover took home "The Biggest Loser" title after dropping 157 pounds. He fell in love with fellow contestant Suzy Preston, who lost 95 pounds. The couple married less than a year later. Oprah first caught up with Suzy in 2008 after she gave birth to their second child. "I hadn't eaten anything good in two years," she said. "And so once the doctor said, 'You know, you really shouldn't be on such a restrictive diet,' I said, 'Okay. No problem.'"

Today, Matt and Suzy say they no longer live by a number on a scale. They've regained some of the weight back, but say they keep active with their two boys.

Season five contestant Mark Kruger, a father of two who originally weighed 285, says he's been able to maintain the nearly 100 pounds he lost on the show. He tells Oprah he's doing better than ever by avoiding processed foods and working out six days a week.

Watch the video below to see "Oprah: Where Are They Now?" executive producers Jill Van Lokeren and Jon Sinclair talk more about the episode.

"Oprah: Where Are They Now?" airs Sundays at 10 p.m. ET on OWN.

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