--I break out my list of material on impaired glucose tolerance short of frank diabetes and neuropathy, a condition becoming increasingly recognized.

Even blood sugar readings that would not be considered in the range of frank diabetes, but would just be considered "impaired glucose tolerance", such as those in the range of around 100-125, have been associated with peripheral neuropathy, particularly those of the small fibers, which tends to be burning, lancating, and electrical in symptoms, and not necessarily the stereotypical "numb". There's been a lot of research coming out about this in the last few years; I keep a list of papaers and studies on this that includes:


http://intl.neurology.org/cgi/content/abstract/60/1/108

http://www3.interscience.wiley.com/c...TRY=1&SRETRY=0

http://www.ncbi.nlm.nih.gov/entrez/q..._uids=16448668

http://www3.interscience.wiley.com/c...07929/ABSTRACT

http://www.ncbi.nlm.nih.gov/entrez/q...d_AbstractPlus

There are a lot more, but you get the idea.

Certainly, a long glucose tolerance test is called for; I have mine done for at least four hours with glucose and insulin levels taken at baseline and then every half-hour through at least three hours. Often, it's the pattern of ups and downs of the glucose and its interaction with the insulin response that's most revealing.