Unfortunately almost no human nutrition studies meet evidence-based medicine standards. And in fairness to the scientists, the constraints imposed by funding and ethics make it impossible to do really meaningful research. All we get are observational studies which show some correlation, often mixed up with multiple uncontrolled confounding factors.

So if you want to try a different diet like extreme low carb or whatever then go ahead. Maybe it will work for you, maybe it won't. In the worst case it probably won't kill you.