A new analysis of U.S. health data, published Monday in Pediatrics, links children’s attention-deficit disorder with exposure to common pesticides used on fruits and vegetables.

“Exposure is practically ubiquitous. We’re all exposed,” said lead author Maryse Bouchard of the University of Montreal.

The study provides more evidence that the government should encourage farmers to switch to organic methods, said Margaret Reeves, senior scientist with the Pesticide Action Network.

A 2008 Emory University study found that in children who switched to organically grown fruits and vegetables, urine levels of pesticide compounds dropped to undetectable or close to undetectable levels.