Robbie treated the Castawaysadventure as a chance to lose weight -- although he did some major soul-searching along the way -- and according to the reality TV star, he has lost about 180 pounds since Castaways began filming and currently weighs 223 pounds.
"I wanted to get outside my comfort zone and push it," Robbie told Alabama's AL.com website in an interview.
"One hundred percent, I went on the show to lose weight. But what it offered me was so much more."
During his time on the show, Robbie was open about his battle with late-night binge eating and fear of abandonment given his biological parents had put him up for adoption.
"I put stuff out there, but my stuff is a dime a dozen. So many people experience separation or loss. I felt like I was in a bad way, and I needed a little bit of a release," Robbie explained of his decision to be stranded alone on a chain of islands in the South Pacific with barely any food or resources.
"Mentally, physically and socially, it has brought balance back to me. It's almost as if I've come full circle. When you put yourself through a struggle, you're able to see that survival is possible."