Look out America — the Dukan Diet is about to hit shore.

The high-protein, low-calorie plan sparked a wave of followers last year after Carole Middleton, mother of the soon-to-be-royal bride, let slip that she was a fan. "I've been doing it for four days and I've lost four pounds," the 56-year-old told an interviewer. 

Since its launch last May in the U.K., the book has sold more than 250,000 copies, a success largely attributed by the author — Dr. Pierre Dukan — to Middleton's promotion. Next month, the U.S. will likely follow the throngs when a North American version of the popular diet book is released in the U.S. and in Canada on April 19. (The book rights alone sold for a remarkable $1.3 million.)

But what is it? Well, if you remember the Atkins craze from several years ago, this one won't seem too different. The Dukan consists of four different phases; the attack, cruise, consolidation and stabilization. You lose weight aggressively on a protein diet then you shift to a longer-range weight loss and then to a stabilization period. Lean meat, zero-fat dairy, non-starchy veggies and lots of water and oat bran are on the menu.

While experts say you can definitely lose weight on the plan, they warn that it is not an all-around healthy diet.

"A once-daily multivitamin will not compensate for the nutritional goodness from fruits, whole grains and healthy fats that are inadequate in The Dukan Diet," Keri Gans, MS, RD, a spokesperson for the American Dietetic Association told WebMD.

"Constipation, bad breath, dry mouth and fatigue should be a red flag that this is not a healthy diet," she says.

Agreed — don't buy into the hype, don't part ways with your cash. The secret to dieting is cutting out the fat, dropping the sugars, increasing your intake of fruits and vegetables, and exercising several times a week. It's as simple as that — and a whole lot more nutritious, too.

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