Detox diets claim to leave your body in squeaky clean shape.

Do they really work?

It depends on who you ask.

Most people agree the diets clean the toxins out of your system.

You could be doing more harm than good.

It is not a fast, like the much touted master cleanse, where you get nothing but a concoction of lemon juice and cayenne pepper, but you can forget fine dining.

There is no meat, no fish, no sweets, no alcohol, and no caffeine.

It is what our earliest berry eating ancestors ate.

The theory is most foods since then junk up our insides and fuzz up our brain.

The Gut Wisdom Detox Program has been offered for years.

Mary Ann Lewis signed up, and immediately got a whole new grocery list.

This became the new lunch: protein powder, flaxseeds, vitamin C, and acidophillus. "I was tired of eating apples and carrots. A cracker, it was like, wonderful," Mary Ann explains.

She and other dieters say they got a big energy boost and another unexpected plus. "I've lost that five pounds that a lot of women want to lose."

"It makes you glow a little more. I don't know. I like it," says dieter, Victoria Rock.

"I had a lot of energy. I felt great doing the cleanse," Lee Ann Trotter agrees.

Critics say our lungs, liver and kidneys have been designed to do the job perfectly.

That glow some detoxers get can be dangerous. Nutrition Specialist Dr. Reed Berger explains, "Yu do get euphoria from detoxing or not eating as much. There's also cases where there's an addiction to detox diets."

Dr. Berger says the detox diet should be used to clean out your system, not as a weight loss plan.

Also, people with chronic illnesses should be especially careful.

Even if you are healthy, you should only be on the diet for three days.