Beeturia is caused by eating beets. The symptom is that your urine and stool can turn bright red. There is some evidence that it can be caused by low stomach acid, anemia, or leaky gut...or maybe just caused by variance in genetics or gut bacteria.
I experienced it recently and interpreted it as a wake up call. I struggled with GERD before paleo and there is evidence that is caused by low stomach acid and that proton pump inhbitors I took for so long are really damaging to the cells that produce acid. Maybe my acid production hasn't healed completely and I really need to go 100% no-gluten/crap oils/sugar to get fully heal it.