My skin clears up, brainfog disappears, the white in my eyes get brighter, etc.
After reading a bit i have come to the same conclusion - if your diet is already extremely clean / bland, maybe you won't get the same effect, but for most people that eats lots of different foods, processed stuff, fast food, alcohol, harsh additives, fried/burned food etc. on occasion then i think you really need to give yourself a break at least once a month. For a minimum of 48 hours.