The current diet study making headlines purportedly asked, and answered this question: Which is better for weight loss and improving cardiac risk, a low-fat or a low-carb diet? For starters, that is a truly lousy question, resurrected from something like the Stone Age. I doubt even the Paleo clan find the question attractive, since they like prehistoric food, not prehistoric research questions about food.
Why prehistoric? Because it is long known and well established that dietary fats run the gamut from good to bad to ugly. No good diet should willfully exclude the monounsaturated fats and omega-3s in nuts and seeds and avocados. I'm pretty sure everybody not stuck under a boulder knows that.