You will need to start slow and add them in to see what triggers cravings. I didn't really add mine in slow, but I watch for trigger foods. I am not a big fruit eater so most of mine come from whole grains. Everyone is different and you really need to find your own special formula. That is what is so great about SBD.
Most people, including the book, will tell you to introduce one new healthy carb per day or even week. Like add ww bread and see how you tolerate it and how it effects both cravings and weight loss. Then add a fruit.
SBD is about learning to recognize the signals that your body gives you and using that to make it work for you. For instance, I can eat Strawberries and there is no issue...no cravings at all. I have to watch eating dip with triscuits because I tend to eat too many. I don't stop eating it, I just watch myself. If I eat dip with veggies I do much better and know that I am doing something healthy. You can eat a lot more veggies with dip and so that is what I usually do