Some damage to nerves is permanent. I guess I should say damage to brain or spinal cord, felt in the nerves. Some of it heals. But being on a low fat diet is very important for some kinds of MS, like mine. I was a patient of Dr. Swank who made the very low fat diet for MS well known. I probably will never get rid of high triglycerides. I can't take any of the meds that do that.