You know as well as I do that people are all over the map on this. I like animal fat and coconut fat for the majority of calories, but root starches are apparently safe, too. Go by your ancestry. What kinds of food did the majority of your ancestors eat, for the majority of the time? Start there. Then try things to see what your body likes and doesn't like. If I eat too much dairy, for example, I get huge boils on my face, fart like a factory, and can't poop for two weeks. So I only eat it once in awhile.