Hi Su and welcome to the beach
Join us on the daily threads.
To answer some of your questions: caffeine stimulates the pancreas to produce insulin and we want to keep these foods to a minimum. That's why we try to eat low-glycemic index foods. (56-57 in the book).
As far as following some Atkins principles, I guess that would be one of them. other than that, I don't see that the two plans are the same. Remember that SBD is a low fat/low carb whereas Atkins is high fat/low, low, low carbs.
Happy Beaching