Transcript for Dieting Websites Let You Make a Healthy Wager on Your Weight Loss
A new move so bet on yourself. Websites where you can make a wager whether you are going to keep to your diet and make your weight goals. Abbie boudreau explains. Reporter: Forget about gambling in las vegas. Try taking a gamble on yourself. And maybe you can win $10,000 for losing weight. 46-year-old brenda had tried lots of die es. But nothing teamed to work. You had dieted before? Yes. Reporter: And the weight kept coming back on. There's a website where you can bet on your weight loss and double your money, she gave it a shot. Money was a good incentive for you. Yes. It really, really did. I really needed the money. Reporter: In august, she bet 75 dollar that she could lose four pounds in three months. You're significantly more likely to lose weight. Reporter: Here's how it works. Decide how many pounds you want to lose and how long it will take you to drop the weight. Then, you tell us how big you want your prize to be. You can set it as high as $10,000. And we'll tell you what bet you have to make in order to get that prize for accomplishing that goal. Reporter: Already, healthywage says it's dished out $1 million in winnings. And the total pounds lost? They say 2.3 million. And for brenda, her gamble paid off. She lost the 44 pounds and gained $2,000. This time, you gambled on yourself. And you won. It feels great. Reporter: For "good morning america," abbie boudreau, abc news, los angeles. Fascinating idea. I love the concept. They get the money. They go to insurance companies, HMOs, HOSPITALS, FOOD COMPANIES, Looking for creative ways to fight obesity. That's fantastic. Also fantastic, robin and josh at the vatican. Hey, guys?
This transcript has been automatically generated and may not be 100% accurate.