We knew that being overweight isn't good for you, but didn't appreciate that inflammatory arthritis - the type in which the immune system attacks the joints - is more common in overweight women. Well, an analysis of the famous Nurses' Health Study - involving over 200,000 women and over 30 years of follow up - was just published in Annals of Rheumatic Diseases. Particularly among women aged under 55, those who were overweight where 50% more likely to develop rheumatoid arthritis than those who were not.