I read with interest Jimmylegs' post in which he looks back to his vegan days and considers the possibility that deficits in his diet had caused his MS to develop. I've had some of the same thoughts concerning the extreme low-fat diet period in my life, during which my MS developed.
A low fat diet is usually also low in dietary cholesterol, and mine most surely was. From my reading, I've since learned that cholesterol forms a significant component of the myelin sheath. My cholesterol level -- and my nutrition status in general -- were low at the time my MS got rolling. Were there simply inadequate supplies for repairs?
Whatever. I've been through my share of experiments with diet and supplements. Nothing really changed one way or another. For the past several years, I've been tweaking a low-carb approach.
Based on my reading, I now make sure my diet is rich in cholesterol -- plenty of eggs, red meat, full-fat dairy, etc. -- low in grains and legumes, and gluten free. It is also basically free of processed and "man-made" foods.
So far nothing has changed with my MS, but my stomach is much happier.