Rheumatoid arthritis (RA) is a chronic autoimmune disease, the cause of which is not completely understood. Medications are used to treat the symptoms of RA but may have substantial side-effects. A number of nutrients or dietary therapies have been investigated as alternative or adjunctive therapy for treating symptoms of RA, including omega-3 fatty acid supplements, antioxidant nutrient supplements, herbal medicines, vegetarian or vegan diets, the Mediterranean diet and elimination