Dubbed “the French Atkins” this diet reportedly has Gisele Bundchen and Jennifer Lopez among its celeb fans. Kate Middleton and her mother were rumored to use the Dukan Diet to slim down for the royal wedding.
On the Dukan Diet you only eat lean protein, plus a small amount of oat bran each day, and drink 6 to 8 glasses of water a day in the first phase ("attack"). In phase 2 (the "cruise" phase), you introduce vegetables back into your diet, but starchy ones—like potatoes or corn—aren’t allowed.
It’s not until phase 3 ("consolidation") that you’re allowed to eat fruit, grains and dairy again, which is why this diet isn’t nutritionally sound.
There are some pros to the diet, though: Dr. Dukan incorporates walking 20 to 30 minutes each day into the plan and you’re told to eat lean protein.