I found Controlled trial of fasting and one-year vegetarian diet in rheumatoid arthritis.
"Fasting is an effective treatment for rheumatoid arthritis, but most patients relapse on reintroduction of food."
This suggests that rheumatoid arthritis (RA) is an ongoing process, triggered by something that's consumed.
"After an initial 7-10 day subtotal fast, they were put on an individually adjusted gluten-free vegan diet for 3.5 months. The food was then gradually changed to a lactovegetarian diet for the remainder of the study."
Are you thinking what I'm thinking? I'm thinking Gliadorphin-7, as per Wheat, Constipation, Ischaemic Heart Disease, Type 1 Diabetes, Schizophrenia and Autism.
This suggests that RA is caused by peptide chains passing through loose "tight junctions" in the gut, triggering an (inappropriate) autoimmune response. For ways to improve gut integrity, see Cow's milk, Schizophrenia and Autism.
BCM-7 can be avoided by drinking A2 milk. Cheese is probably made from A1 milk, so should be avoided.
To reduce inflammation in joints, consuming lots of oily fish may help, as an adjunct to prescribed anti-inflammatory medications.