How have you been doing? Interesting that you posted this today. I had my rhuemy visit and asked about this very thing.
Fluffytwo also posted on this topic.
I just love my doc, she said that she has been keeping track of her patients to see if there is anything to recommend, and she said that it seems to be completely up to the individual. Some do better if they stay away from meats and carbs but that doesn't work for others Some have success cutting out certain foods some haven't. She suggested keeping a diary of foods and flares to see if there are any common triggers, for me personally. She said that there doesn't seem to be a "size fits all" plan that she can perscribe. Every person's body reacts differently. The best she could say is to eat a healthy well-balanced diet, which is good for all of us, RA or not.
She also ran a test on my vitamin D levels, I guess low levels aren't uncommon with RA, and low levels can effect the calcium absorption for the bones.
We talked about supplements, and her advice was a multi-vitamin, calcium, and fish oil. Again, she has been keeping track to see if there are any other supplements to recommend, and so far, these and the folic acid are her best choices.
Don't know if this helps you any, but I felt better after talking to her, knowing that she is looking at all areas of health.
Hope you're doing well..you're in Canada, aren't you?