Quoted from The Hundred-Year Lie:
Deep in the wine country north of San Francisco a friend of mine suffering from an advanced stage of Parkinson’s disease offered me his insights. […]
He was curious about his fellow patients and the triggers for the onset of their diseases, so he began taking informal surveys of their habits and lifestyles. […]
“There was only one common factor I found among the entire group of us,” Solomon told me. “We all had grown up eating a bad diet. We all had been raised on processed foods, and once in adulthood, we had been hooked on fast food and junk food. We were deficient in proper nutrition for our entire lives, and then we came down with Parkinson’s.”
Mainstream medical science regards the causes of Parkinson’s and related nerve degeneration diseases such as ALS—commonly known as Lou Gehrig’s disease—as being largely unknown. […]
What we do know for certain is that neurodegenerative disorders have become an epidemic that increasingly strikes people before the age of forty, a stark contrast to less than two decades ago, when it was rare to find anyone under the age of sixty with these afflictions. One theory is that the disorders are triggered by exposure to mixtures of insecticides and other chemicals commonly used in agricultural areas such as the wine country of northern California, where my friend Solomon grew up.
Randall Fitzgerald, The Hundred-Year Lie, pg. 40-41