--as I've talked about before, "pre-diabetes", or impaired glucose tolerance, can be a cause of neuropathic symptoms, and is suspected in a number of "idiopathic" neuropathies:


http://www.massgeneral.org/neurology...dOaklander.pdf

http://appneurology.com/showArticle....leId=188500771

http://care.diabetesjournals.org/cgi...full/24/8/1448

http://www.neurology.org/cgi/content/abstract/57/9/1701

http://www.medpagetoday.com/Neurolog...rology/tb/3538