Some people with RA have discovered that particular foods will either aggravate or help their arthritis. However, physicians have done careful studies and currently do not find evidence or proof that change in the diet is important in either causing or curing rheumatoid arthritis. It is very important, however, to maintain a healthy diet that includes adequate protein and calcium.
During flares of arthritis, people lose their appetite and tend to lose weight. At these times it is important to make sure to take in enough calories. When arthritis is less active or when people with RA are taking corticosteroids, it is important to avoid excessive weight gain. Alcohol intake should be very modest in people who are taking aspirin or NSAIDs, and people who take methotrexate should avoid alcohol completely. Other healthy practices, such as not smoking and getting regular medical checkups, also are very important for individuals with rheumatoid arthritis.
(Source: University of Washington, Orthopedics and Sports Medicine)</