I've had MS for 24 years. I've not ever heard of anything that we should...or should not..eat that would help or hurt the MS. There are medications you should avoid -- anything that will boost the immune system. And "natural remedies" that promise to boost the immune system (generally they'll offer that description on the label, and misleadingly suggest the remedy is great for MS. Not!!)
But other than that .. a balanced diet, lots of fruits and veggies...all the usual healthy stuff that doctors recommend.