While those things are still true, an entire industry has sprung up to help us achieve those goals. And over the past few years, dieting has gone high-tech, with an assortment of devices and services designed to help us shed the pounds. Many attempt to turn electronic items we use already, like cell phones, MP3 players, computers, and personal digital assistants (PDAs), into weight loss aids.

But is this high-tech approach for you? More important, could it really help you lose those extra pounds or build those six-pack abs?

The answer, it seems, depends on the gadget -- and on you.

"If something helps you make healthy lifestyle changes, and you can maintain those changes, then it's always a good thing," says New York University nutritionist Samantha Heller, MS, RD.

In fact, a study presented at an obesity meeting in October 2005 showed that listening to music while you work out may help you stick to a fitness plan and boost weight loss.

That said, Heller cautions that many of the devices on the market may be unrealistic, not only in terms of cost but also in what they can accomplish -- particularly when it comes to helping us make permanent changes in our eating and exercise habits.

Other experts agree.

"Clearly, some of these devices and services are better than others but in the end it still comes down to you, how much you eat and how much you exercise -- that's what matters most," says Lona Sandon, MS, RD, a spokeswoman for the American Dietetic Association.

To help keep you up to date on the world of high-tech weight control, WebMD asked several experts to help us investigate the possibilities. Here's what we found.

The Food Phone

Keeping a food journal is one of the oldest and best-known ways to launch a successful diet. By writing down everything we eat, experts say, we can clearly see how much and how often we're eating -- and take steps to deal with bad habits. The Food Phone service takes it one step farther by providing you with instant "live" feedback on every meal.

How it works: Dieters pay a monthly fee to stay hooked up, via cell phone, to dieticians who are available 24/7. Whenever you get the urge to eat, you snap a digital picture of what you want to chow down on, and send it electronically to a food phone coach. The coach phones back with an instant "thumbs up" or "thumbs down" along with suggestions for what to do instead, such as eating half a portion of your desired treat.