Neuropathy of undetermined etiology is a common disease that usually starts at the sixth to seventh decades. It can cause significant pain and disability. Previous studies have demonstrated increased prevalence of abnormal glucose handling, when these patients were tested with oral glucose tolerance test (OGTT). On the other hand, many of the neuropathy patients suffer from pain and depression and obesity; and abnormal OGTT in these patients may be the result of these factors. We assume that if abnormal handling of blood sugar is the cause of neuropathy, these patients may have evidence of damage to other organs (like eyes and kidneys) as a result of abnormal blood sugar. In a pilot study, we will determine the incidence of subtle damage to kidneys, eyes and also look for other factors associated with abnormal glucose handling in patients with neuropathy and abnormal OGTT and compare it to age matched controls with normal OGTT.