Try it for a week a few moons ago. The first three days are kinda rough - growling stomach and breaking the simple habit of shoving things in the pie hole. Then, BAM - clear head and plenty of energy. You’re allowed to drink as much water as you want. Coming off of it took several containers of prunes. Then, back to the real world.
The ultimate WMD (weapon of mass diarrhea) is a combination of cabbage kimchi, dried apricots and apple cider. You could blow Hoover Dam with that combination.