I find the opposite. Most of us need a high-protein diet. I have even met two or three people who were successfully vegetarian before getting ME/CFS, but now have to use meat or at least fish. Most of us who have been ill a long time have modified our diets to find intolerances (e.g. gluten, soy, dairy, and excitotoxins are all common; nightshades is not uncommon) and to figure out what balance of things is good.