I'd stick to the Induction food list in DANDR...in fact, I did during my 1st two weeks of Induction. You aren't going to find any berries there...they come later. As for Diet Coke/Coffee/other sources of caffeine, you will find a specific admonition against them. Many (not all) people fail to lose weight (or lose very slowly) when they are using caffeine. I personally did not want to risk having to repeat Induction becuz I chose to ignore the permitted foods list. Your choices are, as always, your own.