odd observation

I know this is a very strange question...but, here goes........I was wondering if anyone with diabetes noticed rapid growth of black mold in the toilet even when cleaned regularly?  I noticed this in one toilet and not the other. At first I Thought it was teenager bad housekeeping skills.  I began cleaning it myself regularly only to find very rapid return mold growth (only in the one toilet the teenager uses and not the other one).  I have seen this same mold in the toilet of another family members house who may have diabetes.  I wonder if this is associated with diabetes because this teenager has sweaty palms, urinates frequently, (mostly after school and in the evening), thirsty, weight gain, and sometimes has a very fruity smelling breath, but when checked by the doctor has been "within the limits" (althought at the edges)?  Has anyone had the same observation about the mold?  Or more importantly...Has anyone ever frequently tested within the acceptable ranges repeatedly yet still been diagnosed with diabetes or low blood sugar?