A pesticide used prior to the early 1980s and found in milk at that time may be associated with signs of Parkinson’s disease in the brain, according to a study published in the December 9, 2015, online issue of Neurology®, the medical journal of the American Academy of Neurology. Researchers also measured in 116 brains the amount of residue of a pesticide called heptachlor epoxide. The pesticide was found at very high levels in the milk supply in the early 1980s in Hawaii, where it was used in the pineapple industry. It was used to kill insects and was removed from use in the US around that time. The pesticide may also be found in well water.
— source sciencedaily.com