What worked is a Paleo-style plan that eliminates grains and emphasizes protein. It's low in carbohydrates, gluten-free and involves minimal dairy, with no sugar allowed.
"I really avoid grains and starches, so meats and vegetables and fruits are my diet. I make them all different ways to keep it interesting," Chaz explained.
However, he also credits exercise for his weight loss success.
After his success on "Dancing with the Stars," Chaz continues to win with waltzing.
"I still enjoy dancing. I still take classes," he revealed. In addition, he's benefiting from the cardiovascular and strength-training involved in high intensity exercise.
Chaz has tweeted his tips for dieting to encourage others.
"What's worked for me is, no sugar, no grains, no dairy except goat cheese, no white starches, portion control, and high intensity workouts," he revealed.
But Chaz emphasizes that his diet is not temporary.
"I find it so ironic that I'm getting tweets from folks asking me for diet advice. It's not about dieting, it's changing eating habits 4ever," he tweeted.
And he believes that if he can do it, anyone can achieve his results.
"Thanks for all the congratulatory tweets about my weight loss. If I can change my diet, giving up grains, sugar, and dairy, anyone can!" Chaz tweeted in response to questions from fans.
In addition, Chaz underwent cosmetic surgery to remove the loose skin left from his weight loss success.
Co-host of "The Doctors," plastic and reconstructive surgeon Dr. Andrew Ordon and his partner, Dr. Ritu Chopra, noted that excess skin from extreme weight loss can only be removed by surgery, not dieting.
"I’m just hoping that I’m going to look that much thinner without the extra skin on me," he said before the surgery.
Two types of cosmetic surgery were involved: Liposuction and a tummy tuck (abdominoplasty).
Chaz also was given diet pills to help him shed the pounds, according to Dr. Ordon.
"He did have one of the newer approved diet pills that helped him along. It wasn't earth-shattering, but it really did help him through the tough times," said Dr. Ordon.
Chaz also has been open about his transition and gender identity journey. He's authored a book about it: "Transition: Becoming Who I Was Always Meant to Be" (click for details).