A juice cleanse offers people a false sense of security that they are doing something beneficial, when in fact they're not.

You may lose a few pounds on the scale during the first days, but once you come off a cleanse, and eat food, you could gain all this weight right back.

Cleansing is ineffective as a long-term solution to weight loss. A person may shed pounds in the beginning of a cleanse, but this is due to a loss of water, she said.

But the loss of water weight comes at the expense of a loss of muscle, which is a steep price to pay.

Many celebrities have popularized the idea of cleansing. Some stars have tried the approach as a quick way to lose weight, while others have done it to feel healthy after overindulging. 

And once people hear the hype and that the "famous and beautiful people" are doing it, everybody else wants to jump on the trends.