Britain's Catherine, Duchess Of Cambridge Smiles As She Meets Guests During A Garden Party Held At Buckingham Palace, In Central London
Britain's Catherine, Duchess of Cambridge smiles as she meets guests during a garden party held at Buckingham Palace, in central London June 10, 2014. REUTERS/John Stillwell/Pool

Kate Middleton reportedly lost a lot of weight before her wedding. The Duchess of Cambridge was on Dukan diet ahead of her wedding and according to Pierre Dukan, the creator of the famous protein-heavy plan, Kate looked a lot thinner.

"I think she lost too much," said Dukan to Daily News, adding that "At the beginning, she had good cheeks. Now, she has no cheeks."

The Dukan diet became a family affair in Kate's family as she prepared to take vows with Prince William, according to further reports by the website. The diet helps in fast weight loss.

The diet has four phases. In the first phase, it requires you to abstain from eating any kind of fruits or vegetable and only "attack" on protein. The second phase is called "Cruise" and it lets you eat a few kinds of fruits and vegetable on particular days. The third phase is called "Consolidation" where carbohydrates are introduced to the body along with two high calorie meals like wine, dessert or appetiser.

Dukan further said that Middleton could continue on this diet, even in her pregnancy, as it is perfectly healthy. However, New York City-based nutritionist Alissa Rumsey says that the Dukan diet is not nourishing enough.

"Anything that cuts out food groups automatically raises alarm bells for me," she told the website, "You're missing out on a whole variety of nutrients."

She even said that may be a low calorie diet may help you lose pounds, however it may not lead to fat loss. According to Alissa, Dukan diet leads to muscle loss and that is why one looses weight at a high pace. Reportedly, carbohydrates are needed in body to retain water and when one drinks water to rehydrate the calories come back.

Furthermore, Dukan diet could also damage the kidneys as they have to work harder to digest the protein and this can lead to a ketosis, "in which the body is using fat, not carbs, to burn energy, which can cause a host of side effects," Rumsey further said.

Apart from Middleton, other celebs who are Dukan devotees diet include Jennifer Lopez and Gisele Bundchen.