The Overnight Diet: Dr. Caroline Apovian claims in a new book you can lose weight while sleeping

CINCINNATI - A new rapid weight loss diet says you can lose weight while sleeping, and without exercise.

Dr. Caroline Apovian, an obesity doctor and author of "The Overnight Diet," claims that you can lose two pounds overnight and up to nine pounds after one week.

How? She says eating a high protein diet for six days followed by a liquid diet for one day and adding an appropriate amount of sleep will lead to effortless weight loss.

"That first night you go to sleep, you sleep eight hours," Apovian told ABC. "The next morning, you're down two pounds. If you continue to get enough sleep, you wont get those hunger pangs."

She even claims that exercise isn't required.

"You will lose fat and retain muscle mass because of the protein [you eat]," Apovian said.

Amy Frankel, a 42-year-old mother, said she was wearing sizes 10 and 12 before she tried the diet, but after giving it a try, she now wears a size four.

"You're not starving yourself, and you're not ever feeling deprived," Frankel told ABC. "It's not difficult."

The catch? Critics are skeptical when it comes to dramatic weight loss in a short period of time.

One critic told ABC in order to lose two pounds in one night, you would have to expend 6,000 to 7,000 calories and that just isn't feasible to do when you're asleep. He said the majority of those two pounds you may lose would be from water and salt in your body.

To watch the full ABC story, go to .

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