How does the Atkins Nutritional Approach work?

The diet initially eliminates simple carbohydrates (sugars) and complex carbohydrates (starches) except for high-fiber vegetables, for the first two weeks. This allows for cravings triggered by High Glycemic foods to be controlled and prevents binge eating. The initial two-week period is considered a “jump start” for weight reduction. Your meal plans will tell you exactly what to eat!

The first weeks will take you through the Induction and Ongoing Weight Loss phase.
Induction is a very low carbohydrate phase for the initial two weeks. You will be consuming only 20 grams of carbohydrates a day. As a result of limiting carbohydrate intake, your initial weight loss will be very substantial.
As the diet progresses, controlled amounts of carbohydrate-containing foods are gradually introduced to your weekly meal plans.

Ongoing Weight Loss phase will allow a very steady weight loss. After the two week strict phase you will add 5 grams of carbohydrates each week to gradually re-introduce some carbohydrate foods up to 40 grams per week. You may stay on this program as long as you wish.
Next two phases are Pre-Maintenance and Lifetime Maintenance phase.