Keep eating, but stay light. This applies to nearly everyone in the western world, but Particularly to you if you’ve got MS.
Food is for pleasure as well as fuel. Don’t use it to punish yourself . You are being punished enough already, if it’s punishment that turns you on.
There are some broad guidelines designed to strengthen the myelin sheath, immune system and general health.
Don’t give anything up you like, just eat less of it. Smaller portions, no seconds, not every day, that sort of thing. No need to turn veggie, just cut right down on meat. We all eat far too much of it, anyway. You can’t eat too many vegetables. Cram them in.
Reduce saturated fats, which are the fats that solidify at room temperature, like butter, cream, cheese, lard. Wherever possible, go for freshly cooked food, rather than convenience meals, and go for fish rather than meat.
None of this means you should give up chocolates or cakes. To go to the extreme of giving things up is either hysterical or histrionic. And you’ll probably fail. Everything in moderation, remembering that, as a species, we are omnivores.
Nearly everything else is food industry hype, mystification and marketing.
Watch your weight. Every pound you put on is an extra pound your legs have to carry. Care for your legs, give them a break, lose weight. But, again, don’t obsess about it. Just cut down on the quantities. Instead of two doughnuts, have one. Simples!