Rheumatoid arthritis (RA) is a chronic disease that causes joint inflammation. Dietary management of RA focuses on adding foods that fight inflammation and removing foods that promote inflammation.  To fight inflammation, add fish and the fish oil supplements, EPA and DHA, and foods high in the antioxidant nutrients, vitamins E, C and selenium.  Research shows that eliminating certain foods can bring relief. Benefits are linked to vegetarian diets, which eliminate animal fat and protein, to alcohol elimination, and to avoiding foods that cause arthritis to flare for an individual.  Individual intolerances are found by keeping a diary of food and symptoms, eliminating probable offenders, and then re-introducing those foods to see if symptoms change. Foods commonly implicated in RA are corn, cereals, and dairy products.

I just came across this website that offers a lot of information on arthritis and your diet...you may find it helpful: http://nutritionfacts.org/topics/arthritis/  (btw..it's science based and non-commercial)