This talk is mainly focused on the prevention of cancer but is very relevant to MS and shows how nutrition is essential in combating disease. A list of the optimum foods mentioned are:
Soy bean, artichokes, parsley, berries, soy, garlic, red grape, brassica, oranges + lemons + citric fruit, lavender, glucosamine, green tea and turmeric
Cooked tomatoes are also said to be very good for you as they have a higher lycopene (a powerful antioxidant) content than raw ones.
Watch this eye-opening talk for yourself: http://www.ted.com/talks/lang/en/william_li.html