Take a few minutes to ponder the ramifications; the food we eat may literally be making us dumber. And yes, food is a major pesticide source despite what industry might claim… The most important enzyme responsible for breaking down these pesticides in the human body is called serum paraoxanase. Some people have a lot of paraoxanase activity and are able to break down the pesticides really fast. Guess which subpopulation scientists are beginning to find has significantly reduced paraoxanase activity? People with autism.