-- body does actually use vitamins, fiber [...] Your brain requires them as well -- Just nitpicking here - by definition fiber is 'the indigestible parts of p

-- body does actually use vitamins, fiber [...] Your brain requires them as well -- Just nitpicking here - by definition fiber is 'the indigestible parts of plant food'(1). So even if it can possibly be said that the body uses fiber - it is probably used in some non-nutritious way - we can be certain that the fiber does not reach the brain. (1) http://en.wikipedia.org/wiki/Dietary_fiber http://en.wikipedia.org/wiki/Dietary_fiber