The Most Dramatic ‘Biggest Loser’ Before-And-After Transformations Of All Time

Jim, 47, started the most recent season of The Biggest Loser at 385 pounds. He got the nickname "Coach" because he is one in real life (for a youth football team). The name stuck as he proved himself to be a team leader and motivator right from the beginning of filming.

Jim lost 144 pounds (!) and ended the show at the new weight of 241 pounds. He told People Magazine, “That final moment on stage—when I knew I was The Biggest Loser winner—I looked over at my wife, my three sons and my trainer, Erica, and I had a feeling of accomplishment that I had never felt before in my life."

Rachel was 260 pounds when she joined the show. She made it clear from the start that she was there to work hard and change her life—and she did.

Fans were shocked when Rachel revealed at the finale that she was just 105 pounds. She lost 60 percent of her body weight, and people were concerned it was too much. Rachel later said she lost the weight by eating 1,600 calories a day and working out. "I'm extremely proud of the way I lost the weight," she said during a media conference call, per the Los Angeles Times.

Allen, who started at 325 pounds, went on the show because his weight was impacting his career as a firefighter. He also said he was worried that he wouldn't pass his next physical at work.

Allen didn't win season 8, but he definitely accomplished what he set out to do. He lost 116 pounds, or 35 percent of his body weight, on the show.

Rebecca was 279 pounds when she started the show. She made it to the makeover portion of the show, but unfortunately didn't win the overall title.

By the end, Rebecca lost 139 pounds and nearly 50 percent of her starting body weight, which earned her the $100,000 prize for most weight lost by an eliminated player.

Bill started the show at 334 pounds and competed alongside his twin brother, Jim. At the start, he admitted that he had a "body built by baklava." Steady weight loss, combined with a serious dose of grit, eventually helped him win season four.

Bill didn't mess around: He lost 164 pounds—nearly 50 percent of his body weight. Bill later said that being around his family and kids helped keep him motivated. "The Biggest Loser campus is a place of hope," he told People.

Michelle started season 6 at 242 pounds and said that she worried her weight was holding her back in life. Michelle competed in the season alongside her mom, Renee.

Michelle ended up winning the title after losing 110 pounds. She later told Access Hollywood that she spent "hours, upon hours, upon hours" at the gym to lose the weight.

Olivia started the show at 261 pounds, and competed alongside her sister Hannah. The opera singer said she joined the show because her weight and polycystic ovary syndrome diagnosis meant she probably wouldn't be able to have children if she didn't lose a significant amount of weight.

Olivia ended up losing 129 pounds and took the title for the season. She's now a master instructor at SoulCycle.

Olivia's younger sister, Hannah, also competed on the show. Hannah started out at 248 pounds, and made it to the final round.

Hannah lost 120 pounds, which was 48 percent of her body weight. She didn't win the title, though—she was edged out by her big sister.

Danny weighed 430 pounds when he started season 8. He said on the show that he wanted to lose the weight so he could be healthy for his wife and children.

Danny lost 239 pounds by the end—nearly 56 percent of his body weight—to claim the title. He kept the weight off for a couple years with daily workouts and using his bike as transportation. He also created a self-help, motivational company.

Abby's reason for going on the show was truly heart-breaking: She gained weight after her husband and two children died in a car accident. She weighed in at 247 pounds when she started her journey.

Abby ended up losing 100 pounds, which was 40 percent of her body weight. She's now a motivational speaker.