I think most will reccomend breast meat but I roast the whole bird 🙂
There is a recipe here for chicken sausage using the dark leg meat. I think certain fats are important when on this diet as well.
Also, I now roast the chicken, take off all the meat for later meals then make bone broth which is said to be good for you. certainly better than any store bought broth that I have seen. Here is a nice article on it.