Eating fish at least twice a week may significantly reduce the pain and swelling associated with rheumatoid arthritis,in which the body’s immune system mistakenly attacks the joints, creating swelling and pain. Studies have already shown the beneficial effect of fish oil supplements on rheumatoid arthritis symptoms, but a new study of 176 participants at Brigham and Women’s Hospital, in Boston, found that increasing the amount of fish containing omega-3 they ate weekly as a whole food lowered their disease activity. The Arthritis Foundation estimates that about 1.5 million people in the U.S. have the disease; women far more often than men.

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