Rumored as the diet choice of Kate Middleton, Dukan is a high-protein, extremely low-carb diet thought up by a French doctor. It consists of a complicated and rigid four stage plan: Attack, Cruise Control, Consolidation, and Stabilization. The Dukan has been compared to the Atkins diet but takes the concept even further by also excluding vegetables during its first phase.
Although this severely restrictive diet may help you lose weight short term, problems with it include:
Possible side-effects of the plan include lack of energy, bad breath, constipation, and the potential for kidney damage.