The second but most important key to understanding diabetes and to understanding blood glucose levels is to first understand the C-Peptide test. C-Peptide was discovered in 1967.Other names for it include: Insulin C-Peptide, Proinsulin C-Peptide.C stands for "Connecting" as in Connecting Peptide.C-Peptide comes from the production of the insulin molecule in the beta islet cells of the pancreas and can be measured by a blood test.C-Peptide is released in equal amounts to the amount of natural endogenous (internal source) insulin.Bottled insulin (exogenous � external source), I am told, does not contain C-Peptide.The test for C-Peptide has been around for a long time. It has been my experience that doctors have been more concerned with blood glucose control than with the cause of elevated blood glucose levels.Therefore I conclude that they unscientifically assume that insulin users have no or few Beta cells or beta cell function in their pancreas.Doctors do not use the C-Peptide test, and when they do, they don't understand the results because of what they assume.Diabetics may have only done one C-Peptide test in their lifetime.This test is simply used infrequently.C-Peptide levels change continually in relation to a blood glucose load. I have noticed two facts that really troubled me. 1.Whenever I look up any information about diabetes, there is no mention of the C-Peptide test, nowhere, not in bookstores, not in the libraries, not on the web, not even in the medical books on diabetes that I have read.I suspect that others would have similar results.What is going on here? 2.Many sources tell diabetics they should eat carbohydrates.This is wrong.So long as a diabetic maintains a normal blood sugar range of 80-120 mg/dl, and a healthy body weight, and gets proper nutrients, the body is being nourished.Why then bombard the system with extra sugar, which will require more insulin?The body is not a limitless dumping ground where anything can be thrown in without consequences. A heart doctor checks the heart many different ways.A kidney doctor checks the kidney function through many tests.Why then do doctors and endocrinologists blame diabetes on the pancreas, and not check the pancreas? < PREVHOMENEXT >