CARNIE WILSON is on a mission. After successfully dealing with her own weight problem, she's on a crusade to help educate others about the serious risks associated with obesity and ways to overcome their dilemma. Tonight on ET, we're behind the scenes as Carnie shares her struggle in a helpful, new infomercial!

"It's very important I do this because, in a nutshell, it's me providing the best care, the best surgeons for people who are in desperate need of help with their disease of morbid obesity," Carnie tells our own MARK STEINES. "I'm linking them up with the best doctors and I feel really darn good about that."

At one point weighing over 300 pounds, the WILSON PHILLIPS singer underwent Gastric Bypass Surgery (GBS) in 1999 to help her lifelong battle with obesity. Five years later, she says she's doing great.

"I've beaten the odds and it's wonderful," exclaims Carnie. "Ninety percent of this weight I've lost I've kept off, and I've put on 10-12 pounds, but I don't shudder at this -- this is a normal fluctuation, so I'm thrilled. I'm living a healthy lifestyle."

The author of Gut Feelings and I'm Still Hungry shot an infomercial at her home in Los Angeles entitled "Lite and Hope," in which she explores her personal feelings about GBS and discusses the issues involved with the surgery, including pre- and post-surgical concerns, insurance costs and supplementary issues such as support groups, diet and exercise. Viewers will be able to call a toll-free number, punch in their zip code and get referrals to "qualified surgeons" in their area.

"The purpose isn't to convince somebody to have gastric bypass surgery," says Carnie. "The purpose is to offer them the best care available. I'm not selling a product. I'm not selling Tupperware. It's our heart, it's our shame, it's everything I've ever known, so I'm empathetic. You know, it's not just having sympathy for them -- I know where they've been."

The infomercial, which airs on the Lifetime cable network beginning next year, also includes a special moment in which Carnie gave a dear friend a gift. A woman who always wanted GBS, she could not afford it and her insurance wouldn't cover the operation. So Carnie arranged with the doctors who have donated their time and facilities to the program to do the gastric bypass surgery for free.

"She was completely blown [away]and I could barely keep it together," says Carnie, who reports that they both broke down and cried, they were so happy. "She had no idea; she thought she was coming on to talk about how difficult it is for insurance companies to provide care for this [procedure]."

Watch ET for more with Carnie and her crusade!