Eating one portion of fatty fish every week, or four of lean fish, could halve the risk of developing rheumatoid arthritis, according to a study published in the journal Annals of the Rheumatic Diseases.

    Researchers from the Karolinska Institute in Sweden sent a questionnaire to all women between 1987 and 1990 who were a part of The Swedish Mammography Cohort Study and born between 1914 and 1948.

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