U.S. nutrition experts who reviewed the diet for HealthDay expressed some health concerns, however.
Karen Congro, a dietitian and director of the Wellness for Life Program at Brooklyn Hospital Center in New York City, called it ''a recipe for disaster."
People who follow the diet for a few days will probably be OK, Congro said, but long-term, it's unhealthy. "It is a high-fat diet, it does not restrict salt," she said, among other criticisms.
And, she added, "It really has no evidence'' of effectiveness. "Over the long term, it really isn't good for your heart," she said, citing the fat and salt content.
In France, the National Agency for Food, Environmental and Work Health Safety has criticized the diet as unhealthy. And the British Dietetic Association calls it the "Do-can't Diet" and cautions against it.
Connie Diekman, director of university nutrition at Washington University in St. Louis, calls the Dukan diet "Atkins reincarnated."
A diet with phases injects some fun, she said, "but the very limited nutrient intake makes this a poor diet to choose for healthy weight loss."
Diekman said the limits on carbohydrates aren't supported by science.
And, what about Kate Middleton's mom? "As a registered dietitian, and as a recent mother-of-the-bride, I would caution the royal bride-to-be's mom that she is going to need all the energy she can to thoroughly enjoy this very special day. Carbohydrates are the food that provide us with that energy," Diekman said.
"A much better approach," Diekman added, "would be to choose smaller portions of whole grains, vegetables and fruits with lean protein, and low-fat dairy while limiting the amount of calories from added fats and sugars."
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