By offering information about a wealth of different weight-loss plans, the diet divas encourage their members to find the program that's right for them. Where one plan may fail, another might succeed.

"With our Web site in particular, people realize it's not one simple approach to weight loss. So many people try one diet and move on to another diet. If one diet doesn't work for you, it's easy to choose another. When you find it, you'll know it."

Despite the fact that they run the hugely successful Web site, they're the first to admit that their own diet endeavors have been far from perfect. Over the past 10 years, the sisters have had their ups and downs. Like anybody else, maintaining the loss has been difficult at times. Suzanne points out that although the sisters did gain back a great deal of the weight they'd lost over the years, they've managed to get back on track.

"Everything was great, and we let life get in the way," Suzanne says. "We stopped talking about weight loss on the Web site and that was bad for us. It kind of allowed us to go into hiding. While we did gain back substantial portions of weight, we snapped back out of it."

A large part of their renewed motivation comes from journaling on the Web site, a practice that makes them feel more accountable for their actions. Jennifer, Amy and Suzanne all keep personal logs of their experiences, which can be viewed on the site.

"We have over 60,000 registered members. It's amazing how many people reach their goals and get off track like the rest of us. People are very supportive, and it gives us a stronger goal because we feel like we owe it to them to get back on track and stay there."