I just realized my post had been edited. Sorry for the error!

Here is the citation for the study I had in mind. The bloodsugar101 website mentions several more.

The spectrum of neuropathy in diabetes and impaired glucose tolerance.
C.J. Sumner, MD, S. Sheth, MBBS MPH, J.W. Griffin, MD, D.R. Cornblath, MD and M. Polydefkis, MD;
Neurology 2003;60:108-111

I repeat, high blood glucose can contribute to PN in non-diabetics.