Mary, I'm sure the long time PP'ers can help more, and I surely need to re-read the book, but from what I can tell, you don't have to measure fat, you just have to make sure you use "good" oils, and depending on which plan you follow, some don't allow cheese, nuts, dairy, etc. From what I gather, the important thing to track is your protein, followed by your carbs, and whatever fat comes along with that within the plan is okay. I could be wrong, because I probably read the book too fast