There are quite a few respected docs that are researchers
that consider PN to be a pre-diabetic condition,
even if you have not been Dx'd with a type 1 or 2 diabetic condition.
I do not have diabetes, but it is in my family history,
both sides (type 2 old age onset, my dad & my mom's dad).
My neuro (head of the neuro dept, at Hopkins) has me down
as pre-diabetic, with borderline high-normal test results.