Phase one of the Atkins diet is crucial to success and lasts for an initial period of two weeks, but can be stretched up to 28 days. It is critical that those following the diet follow the rules for the first two weeks as it serves as a foundation for the rest of the plan and can guarantee success in future phases. During phase one, key issues like acceptable food and beverages, banned food, and rules to follow are introduced.

The basic rules include keeping the daily carbohydrate intake down to at least 20 grams or less. Failure to do so will require dieters to increase the beginning phase up to six weeks. Dieters in phase one also need to eat at least three main meals each day or four to five small meals. Potatoes, pasta, fruits, bread, dairy products, sugar, and starch-filled veggies and foods are absolutely prohibited during this time. In addition, there is to be no tea, coffee, soft drinks, or alcohol during this time, only water.

During phase one, dieters are encouraged to take control of their hunger and the amount of food they eat. When hungry, Atkins followers will eat what is listed on the acceptable foods list. In addition, stage one dieters avoid diet products, gum, or other products that pass for food. During this time, artificial sweeteners are introduced as well as daily vitamins.

After completing the 14 day induction or phase one, an Atkins dieter is ready to move no to the other stages. It is only advisable to move on once the induction has been completed successfully. After this phase, dieters will notice a significant change and will be ready for future success on the Atkins Diet.