The Dukan diet is a “low-carb” diet, sort of like the Atkins diet but without the fat that is encouraged in the Atkins diet.
The Dukan diet has four phases: The Attack phase, the Cruise phase, the Consolidation phase and the Stabilization phase. The attack phase lasts about a week and for most people allows you to lose 5 to 10 pounds very quickly. Then the Cruise phase is where you lose however much weight you need to lose. You can lose about 2 pounds per week in this phase. In the consolidation phase you maintain your weight for a couple of months while re-introducing carbs into your diet and then you live the rest of your life, hopefully, at your new weight.
I started the Dukan diet weighing 227.6 pounds. Eventually I did make it down to 175, for a total of 52 pounds lost. It took about 6 months. Having lost that weight, I can say that I feel significantly better physically and mentally.