A recent study gives more evidence that pesticides can cause Parkinson’s disease. The more pesticides one has been exposed to, the more likely you are to develop Parkinson’s, according to a European study of almost 3,000 patients. People who have Parkinson’s disease are more likely to have used pesticides regularly; users with low exposure, such as gardeners, were 9 percent more likely to develop the disease, while users who had high exposure, such as farmers, were 43 percent more likely to develop the disease. So far it hasn’t been possible to determine if specific pesticides are the culprit.