I am going to guess that eating pesticide laden food over a long period time is a contributing factor to Alzheimer's , Parkinson and other neurodegenerative diseases that we see today. It took me months to make the connection between Mexican grown blueberries and the tingling sensation I used to feel in my hands and feet. Had to go through a process of elimination. Now it's possible I was exposed to bad batches with particularly high concentration of those chemicals (all depends on who is spraying). Regardless I don't eat BB's much and when I do it's only California grown organic. Here's one
article.