WW, Other than eating a healthy diet, there is no proven MS diet. Yes, there are all sorts of diets out there that are purported to work to control or cure MS. These diets have been tested and scientifically proven to not work for that purpose.
From what I know the only diet that has some backing to actually working is the Ornish diet. If you go to his website and read the information, this very strict regimen or diet, exercise, meditation, etc.