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According to a study, eating one portion of fatty fish every week, or four of lean fish, could halve the risk of developing rheumatoid arthritis. Rheumatoid arthritis is one of the most common forms of the disease, mainly affecting the fingers, arms, legs and wrists. In this study, around 32,000 of the women had their health monitored between the years 2003 and 2010. Of these women, 205 were diagnosed with rheumatoid arthritis. The results showed that women with the highest consumption of omega-3 polyunsaturated fatty acids (PUFAs) had four times higher intake than those with the lowest intake.