I've made a lot of diet changes over the past few years, trying to find out what works best for my body. Just keep in mind that what is good for me might not be optimal for you, and there's no way to know without just diving in an giving it a try.
Here's a breakdown of the dietary things I've done in order:
1) Eliminated dairy and gluten within a year of having my first symptom (optic neuritis). After making this change, my symptoms/flares were fairly mild (L'Hermitte's sign, some numbness)
2) The Swank Diet. This diet was created by a neurologist and has a 50+ year longevity study, which is why I gave it a try. The main thing with this 'diet' is keeping saturated fat very low. I didn't agree with the allowance of crappy processed wheat and low fat dairy, so I didn't include them.
3) After a while, I realized that my modified version of the Swank Diet was really The Best Bet Diet (still maintaining low saturated fat, but also no gluten, dairy, or legumes (no soy, beans, etc...) This diet was created by another neurologist whose own son was diagnosed with MS.The Best Bet Diet website has some great articles and a FAQ section.
4) I came across info about the Paleo diet by Loren Cordain (there are other versions of this diet, which is also called the Caveman Diet or an Ancestral Diet). The Paleo Diet was similar to the Best Bet Diet, but low carb, so this meant I eliminated all grains and tubers and was basically eating lean meats, fish, vegetables, fruit, sometimes nuts.
5) Over time, I learned about the Primal Diet, which is a high fat version of Paleo. I was really scared at first to increase my saturated fat because keeping it low was a cornerstone of all the other diets. I increased it slowly, and eventually I was eating high fat meat and coconut oil, still no flares. This diet has a fantastic forum called Mark's Daily Apple that is super active.
6) And that brings me to what I'm doing now, which is The Perfect Health Diet. It's basically the Primal diet, but with lower fat and higher carbs.I realized that I personally need a higher carb level to feel healthy (after being low carb for a year, my hypothyroid symptoms got really bad). I feel really good on this diet. It's basically grassfed/pastured meats, fish, eggs, fruit, starches like tubers (potatoes, etc...) and white rice.
7) In addition, I've been adding some Ray Peat tweeks. He's a little controversial since he advocates sugar, but I have to admit that I've seen some significant overall health improvements by following some of his recommendations (increasing sugar and salt, supplementing with pregnenolone). He's a Ph.D with a ton of interesting articles on his website,
and one is even about MS.
Hope that helps - let me know if you have any questions.