A recent study shows that women who use insecticides are at elevated risk for autoimmune diseases such as rheumatoid arthritis and lupus. The results of the yet unpublished study were presented October 2009 at the American College of Rheumatology annual meeting in Philadelphia, PA.

The study of 75,000 women shows that those who spray insecticides at least six times per year have almost two and a half times the risk of developing lupus and rheumatoid arthritis versus those who do not use insecticides. The risk doubles if insecticides were used in the home for 20 years or more.

“Our new results provide support for the idea that environmental factors may increase susceptibility or trigger the development of autoimmune diseases in some individuals,” said Dr. Christine G. Parks, PhD. She is an epidemiologist with the National Institute of Environmental Health Sciences in Research Triangle Park, N.C., one of the lead researchers who analyzed data from the Women’s Health Initiative (WHI) Observational

“The findings are fairly compelling” because they show the greater and longer the exposure, the greater the risk,” said Darcy Majka, MD, assistant professor of medicine at Northwestern University, who also analyzed the WHI data.