I have psoriatic arthritis, which is closely related to rheumatoid arthritis. In addition to my normal stiffness due to the disease, the past 2 years I have been having ankle issues caused by an Achilles Tendon tear. Last week I started a cleanse called "Clean" and have eliminated all red meat, wheat and milk products and processed foods. I have absolutely no pain or stiffness now. My DH thinks I have gone off the deep end when I tell him how good I feel after 1 week on this altered diet, but I feel great!
I think eliminating the wheat and possibly the milk products have lessened the inflammation in my body.

p.s. Someone in my spinning class who also has psoriatic arthritis had stopped all milk products, wheat and alcohol and her symptoms have disappeared. Last year when she told me about her diet, I disregarded it as something I could never do. I am sorry I didn't try this earlier because it is not as hard as I thought.