Friday, December 6, 2013

DDT

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From September 1960 to June 1964, I was an investigator for the US Food and Drug Administration. One of my more macabre assignments was the result of a book by Rachel Carson titled Silent Spring (1962) that raised public awareness of the dangers inherent with the use of DDT (dichlorodiphenyltrichloroethane). This book grabbed the public's attention like few other non-fiction books have. People began organizing to ban the use of DDT, not unlike the organized public outcry against the use of Monsanto's Glyphosate (Roundup). One of my most interesting college courses was the study of a brand new (at the time) concept—Ecology. Since Carson's book dealt with the impact of DDT and other agricultural poisons on the environment, it caught my interest and I read it almost as soon as I could get a copy. Interesting, scary, troubling, but I didn't see any direct application of her thesis to my immediate life.

About the time I was hired, the FDA had begun gathering evidence about effects of using antibiotics in animal feed to prevent disease and to enhance growth, the result of research done in the 1950s that showed that this use, especially in quantity, was creating antibiotic resistant strains of bacteria. A set of laws to monitor antibiotic use by farmers was promulgated and the responsibility for enforcing these laws fell to the FDA and its investigators. As a result, I spent several months talking with farmers about antibiotic use and also checking feed mixers for cross contamination—antibiotics getting into animal feed where it wasn't intended. I also was inadvertently made aware of farmer complaints that DDT was useless for controlling the thousands of flies that infested free stalls and milk parlors, and some thought that it was making themselves and family members sick.

Two main questions formed the basis for my assignments—how was DDT getting into the human food chain, and how prevalent was DDT contamination in the population. Beside direct contact with the poison, milk was found to be an important source of contamination. Within my jurisdiction were several large apple products producers. One of the byproducts of production was tons of peels, cores, stems and seeds called pomace. This pomace was discarded onto large, fermenting and odiferous piles behind the plants, clearly useless until a local farmer decided to feed some to his dairy cattle. The results were amazing; apple pomace increased milk fat production from ten to twenty percent. This discovery proved to be a major windfall for local dairy farmers who began hauling pomace away from the producers by the truckload, and for the producers who were now rid of a nuisance at no cost to them. The caveat—the fat in apple skins concentrated the DDT that the growers used to control pests that infected their trees and passed unaltered through the cows into their milk and then into people.

The other question: What was the prevalence of DDT in humans? Related to this question was my assignment to collect samples of liver tissue from cadavers. For four months I visited pathologist within my jurisdiction and at the end of that time I had packaged seventy chunks of liver from recently deceased humans in dry ice and express freighted them back to our lab in Baltimore. Six months later I received a copy of the results of my work and that of several hundred other investigators nationwide. Ninety percent of all the liver samples contained some DDT, the quantity dependent on several factors such as diet and occupation. Similar investigations are currently ongoing regarding Glyphosate and GMOs that are now suspected of causing a host of serious problems such as several forms of cancer, infertility, stillbirths, fetal abnormalities and other morbid health issues. A poison is a poison; there is no escaping that reality.

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