The amount of fiber one has to consume in order to make sure they have a normal bowel movement without paying for it in pain.
“I have constipation, I can’t make it to the party!”
“Did you have too much or too little fiber?”
“What?” (Groans)
“If you had too little fiber, then you didn’t pay your body the fiber tax to let the stool through.”
“What if I had too much fiber?”
“Then you paid too much fiber tax!”