Tummy troubles are common among folks with MS. The best way to fight this is by adopting a high-fiber diet, Fiol says. If you’re constipated, fiber will help soften your bowel movements, and if you have diarrhea, it can help resolve it by bulking up your stool. You may need as much as 30 grams of fiber daily (one cup of raspberries delivers eight grams, one medium apple 4.5 grams, and one cup of boiled green peas nine). Fruits and veggies are also rich in antioxidants like vitamins C, E, and A, which tamp down inflammation, says Angela Lemond, R.D.N., a dietician in Plano, TX, and national spokesperson for the Academy of Nutrition and Dietetics.