BAKERSFIELD, Calif. -- It is an add campaign that is receiving a lot of attention; the Taco Bell Drive-Thru Diet.

Taco Bell's newest spokesperson Christine Dougherty claims she lost 54 pounds by reducing her daily calories and by replacing her usual fast food and with Taco Bell's new Drive-Thru Diet.

The menu includes seven fresco items that the company claims are lower in calories and fat.

Sounds easy, right?

Stacy Eldridge, a registered dietitian for Kaiser Permanente said the ad campaign can be misleading despite the fast food restaurants claims that the Drive-Thru Diet is not a weight loss program.

"If you are just glancing at it or listening to it, it could send the wrong message to people that you can go through the drive-through many times a week and lose weight. Healthy weight loss takes time and if you read the fine print on the ad, this young woman who lost 54 pounds, it took her 2 years," said Eldridge.

Even though the fresco items on the menu may have reduced calories and fat from the original items, Eldridge said that doesn't mean they still aren't high in calories, fat, and sodium.

"Fast food restaurants have done a good job lately at providing nutritional information to its consumers, however, it is up to the consumers to interpret that information and really know that just because the restaurant made some healthier options, are they really healthy options," she said.

If you choose to eat fast food Eldridge recommended doing so no more than twice a week, and when you do order from the lower calorie menus. But remember not to go overboard.

"People need to remember that healthy weight loss is about one pound per week and what it really comes down to is calorie and portion control, balance, variety, moderation and exercise. And that's hard work," she said.