(I think you were replying to my comment...?)

In any case, a low carb diet helped me a good deal. But of course everybody is different, so don't take my tale as a suggestion per se.

If anything, I would suggest that people suffering from idiopathic SFN who are "only" prediabetic, or have not been tested for insulin resistance, consider investigating the possibility that their SFN might be connected to irregular glucose processing.

Per the literature, there does seem to be a not-well-understood connection between SFN and abnormal glucose processing. However, in my experience, most doctors (and even my SFN specialists) don't seem to investigate the possibility of such a connection, probably due to the fact that SFN isn't typical with prediabetes.

I found an older anecdotal article on the subject today on jabfm.org. I can't yet post links, but it's:

Holland and Prodan, "Peripheral Neuropathy and “Borderline” Diabetes", Journal of the American Board of Family Practitioners, Vol 17, No 2. (March-April 2004), pp, 127-130.

It concludes, in part, "Based on the data available in the current medical literature, we suggest that patients presenting with unexplained painful sensory neuropathy should be evaluated for impaired glucose metabolism with a 2-hour OGTT".