Winfield, 41, didn't make the final cut on the NBC reality show after falling below the red line with a four-pound weight loss in Tuesday's episode.
While she doesn't win the "Biggest Loser" title or the $250,000 grand prize, Winfield will still get to compete for the at-home prize of $100,000 at the Feb. 4 finale.
Before leaving, Winfield, the COO of a Chicagoland fast-food franchise, did get to take part in the show's famous "makeover week." With the help of celebrity designer Tim Gunn and hair stylist Ken Paves, Winfield got a style overhaul before reuniting with her three children.
With a total weight loss of 70 pounds, she vowed to continue working hard at home.
"My journey isn't over yet," said Winfield, who proudly noted that three members of her original red team have made it into the final five. "You have all forever changed my life," she told her fellow contestants.
Winfield also acknowledged her trainer, Dolvett Quince.
"I started with a crush on Dolvett, and now it's pure love," she said.
The final five contestants have one more week on the Biggest Loser ranch before the live finale, set to air at 7 p.m. Tuesday, Feb. 4.