In a study published in the peer-reviewed journal, “Occupational and Environmental Medicine,” French researchers find a link between exposure to pesticides over time and increased risk of Alzheimer's disease. 
http://www.channelnewsasia.com/stories/health/view/1096778/1/.html, 
http://www.alzheimers-research.org.uk/news/article.php?type=News&id=727