Terry--I will try to answer your questions. Please remember that I am not a scientist; since I have not found one all-inclusive source, I have gathered my understanding of insulin from many sources. I encourage you to read all you can on the subject. One source described insulin as "the master hormone" and it is slowly becoming recognized as important in many functions, not only the Blood Sugar Control System.
Normally, the hormone insulin is produced in the beta cells of the pancreas in response to glucose in the bloodstream (measured in the portal vein). In fact, the pancreas over-compensates for the amount of glucose (carbohydrates convert readily to glucose). Not only the amount of glucose in the bloodstream, but, I have read that distention of the stomach or even a sweet taste in the mouth can trigger production of insulin.
Insulin works as a key in a lock, connecting with receptors on the cells, and allows the glucose to enter the cells where it is used as energy or stored as fat. (Vitamin C also enters the cells by the same mechanism of this hormone.)
Insulin is like " lye in the pipes of your house"—damaging to the interior of the blood vessels--some scientists attribute heart disease damage to this process, too. (Insulin can also permeate the blood-brain barrier.) It is my belief that excess insulin damages the blood vessels (blood vessels are found at the center of every CNS lesion), then the macrophages of the immune system arrive to clean up the damage, and the MS cascade starts.
To your specific questions:
If it is insulin, would it appear when I eat badly or what?
Does this tie in with the liver issue? How?
Can you explain again how insulin production/ overproduction would cause or contribute to MS?
I ate little to no carbs for years. Would this have contributed to or would it have delayed MS symptoms?
1. Eating a diet rich in carbs, starch and sugar, will trigger more insulin production.
2. The Insulin-Degrading Enzyme that breaks down insulin and ends its life is primarily made in the liver, I believe. Liver problems might mean your body is not making enough IDE to clear the unused insulin.
3. See above paragraphs about damage to blood vessels.
4. I, also, have eaten virtually no carbs for years now, but my pancreas seems to malfunction and continues to churn out insulin. If your pancreas is responsive to the low-carb diet and normalizes insulin production, you could delay symptoms or even stop the process, in my opinion (and then the body could heal, IMO). If your pancreas is not responsive, excess insulin floats around without glucose to tie it up and just keeps causing damage.
By the way, I have read that "itching" and "gurgling" in the area of the pancreas can indicate something is going on in the pancreas. If it concerns you, don't let a doctor brush it off. You know your body best.