I am probably not the one to answer this question b/c I am not good with all the scientific stuff.
CAD basically controls your insulin levels. It works for people that are carb addicts, its not for everyone. Have you taken the CA test at the top? You need to answer the questions as if you weren't on a diet, how you felt before when you ate carbs.
CAD consists of two CMs (crave-reducing meals) which are extremely low carb compared to Atkins. We don't subtract fiber or so the net carbs thing. We just go by the "acceptable foods" list in the book. CMs are basically protein, low carb veggies and fat, nothing extra.
Then we have one meal that is considered our RM (reward meal). You can have carbs at this meal. The Hellers stress balance so its best to start with protein, veggies and then add a carb. The RM must be timed from the first bite you take, it cannot for any reason go over an hour. After an hour your body realeases a second bout of insulin and you would becoming very cravey again.
This diet takes away that nagging hunger and cravings, which makes it so livable. That and the fact that you can go out to eat or to a friend's house and time it as your RM and no one even knows that you are on a diet.
If your interested in CAD or CALP I'd suggest getting the book. It explains it in detail. I know they run about 5-10$ at Walmart.
I hope this helps, maybe some of the more knowledgable folks will chime in