That is the catch 22 of the situation, they tell you to only eat listed foods, and then Atkins company itself try to sell your there bars and shakes. The reason why it is good to stick to only the listed foods is because it will help to clean out your system and get rid of your food cravings.

I will also to send up a bit of a warning, some of those candy bars are made with sugar alcohol. They taste great, but may have you running to the restroom a few hours later. Best to be a home for the day when you first test them out. And they can tend to stall some people, but that to is an individual thing.