Since leaving "The Biggest Loser," Ruben Studdard has remained true to his promise to continue working hard and improve his health. 

While audiences were shocked to see Studdard eliminated earlier this week during the show's "Halloween" special, that episode was actually taped months ago - giving the 35-year-old plenty of time to make progress behind the scenes. 

"America, my voice may be soulful, but the next time you see me, my body will be sexy," he vowed.

In a phone interview with "TODAY," Studdard revealed that he has lost a total of 104 pounds - a big jump from the 39 pounds he dropped during the four weeks on "Loser." At the time, trainer Dolvett Quince suspected that Studdard's body had hit a weight loss plateau, a common problem during intense exercise and dieting.

"The toughest part is continuing to find a way to lose weight, trying not to hit that wall," Quince told Reality Wanted.  

Studdard told "TODAY" that while his short term goal is to lose enough weight to win the $100,000 at-home prize, his shift to a healthier life won't end there. 

"I'm working hard, but if I don't (win the prize), I’m not going to be disappointed, because I went into the house with one goal — to change the way I thought about healthy living, and I did that," he said. "It's important for me to do this for the rest of my life. And I hope I can continue that. For me, it's not about the $100,000 (at-home prize) or the $250,000 (grand prize). It's about changing my life." 

We'll get our look at a thinner (and sexier) Ruben later this year during "The Biggest Loser's" Season 15 live finale on December 31st. 

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