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Eating fish may help reduce the joint pain and swelling of rheumatoid arthritis, a new study has found.

Researchers studied 176 people in a larger health study who had had physical exams and blood tests and filled out food frequency questionnaires that indicated their consumption of various types of non-fried fish.

The study, in Arthritis Care & Research, categorized the participants into groups by fish consumption: less than one serving a month, one a month, one to two a week, and more than two a week. To rate the severity of symptoms they used a disease activity score that assigns a number based on the degree of swelling and pain.

After controlling for race, sex, body mass index, smoking, education, fish oil supplement use, duration of rheumatoid arthritis symptoms and other health and behavioral characteristics, they found the average disease activity score in each group declined as fish intake increased.

The lead author, Dr. Sara K. Tedeschi, an associate physician at Brigham and Womens Hospital in Boston, said that this is an observational study and does not prove cause and effect.

Still, the observed reductions in pain and swelling from the lowest to the highest group in fish intake is clinically significant. The magnitude of the effect, she said, is large about one-third of the expected magnitude of the standard drug treatment of rheumatoid arthritis with methotrexate.

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Fish as Medicine for Rheumatoid Arthritis - New York Times