CIVIL DEFENSE PERSPECTIVES
November 1995 (vol. 12, #1) 1601 N Tucson Blvd #9, Tucson AZ 85716 c 1995 Physicians for Civil Defense
THE GELDING OF AMERICA: IS DDT TO BLAME?
Although one would never guess it from reports in the mainstream press or the Women's Studies Department at your local college (which seem to suggest that male aggressiveness and oppressiveness are unabated), America is said to be losing its virility. And so is the rest of the world.
The alarms are not sounding about atrophy of the military virtues, or a decline in male commitment to the family, or a birth dearth
-though they probably should.And the cause of the problem is not identified as a moral decline, a loss of faith, the welfare state, or socialized education
-though these can cause the manifestations listed above.No, the concern is focused on DDT, which was banned by the EPA in 1972. Along with other chemicals such as dioxin and polychlorinated biphenyls (PCBs), DDT breakdown products are said to be causing ``Havoc in the Hormones.''
``A chill went up my spine,'' reported alligator endocrinologist Louis Guillette, when he looked at slides of the ovaries of laboratory mice exposed to diethylstilbestrol (DES). He reported similar observations in alligators born on Lake Apopka in Florida, site of a pesticide spill.
Of even greater interest to television documentaries is Guillette's finding that the male alligators have a smaller penis than normal. This and other anomalies in certain wildlife populations are all linked together in the July/August, 1995, issue of Audubon.
Guillette reportedly thinks that we should all ``be screaming in the streets'' because every man today is ``half the man his grandfather was'' (National Review 6/26/95). Guillette is not speaking of the ability to shoot straight, fell timber, or blaze trails. Rather, he refers to the claims that ``male sperm counts [sic.] in the industrialized world have plummeted by a startling 50 percent since the dawn of the `chemical revolution' that began after World War II.''
Audubon also queries whether the hormone-like effects of organochlorines might be responsible for increasing rates of breast and testicular cancer.
In an editorial entitled ``Masculinity at risk,'' Nature (6/15/95) opined that ``it would be a cruel irony if the introduction of DDT half a century ago turned out to have been responsible for a decline of male fertility worldwide.''
The same issue carried an article showing that a DDT metabolite (p,p'-DDE) inhibits androgen binding to the androgen receptor. Studies were done in tissue culture and by gavaging rats with 100 mg/kg/day of the compound. A second article by Richard Sharpe (``Another DDT connection'') referenced a study of sperm donors in Paris. It queries whether the concern is ``a remarkable coincidence.'' Sharpe presents no data; rather he notes that ``we lack accurate data on the levels and routes of human exposure and on whether, and at what levels, adverse reproductive changes can be induced (in animals).''
The editorialist doesn't quite believe his own headline. He cites the ``need for a certain calm.'' After all, ``panic does not make DDT disappear from the environment. Moreover, this will not be the first occasion when a presumed link between an environmental contaminant and a risk to health has melted away on close examination'' [emphasis added].
Already, the evidence against the link is accumulating, and the risk itself may be melting away. An article in Science (3/24/95) referred to a global decline in human sperm count over the past 50 years but cited a study in which PCBs fed to newborn rats actually boosted their sperm production and testes size. There is no evidence of decreased human fertility, and reports of the falling sperm count are suspect.
The study from the Paris sperm bank (Auger, et al., New Engl J Med 1995;332:281-5) concluded that there had been a significant decline in the concentration and quality of semen over a 20-year period and suggested that this could ``implicate factors affecting all the inhabitants of an area, such as the water supply or environmental pollution.'' The study design and statistical analysis were criticized by Richard Sherins in the same issue. In particular, Sherins pointed out that concentration of sperm from one individual can vary two- to four-fold. Furthermore, a reanalysis of the data from 48 previous studies showed a statistically significant increase in sperm concentration over the past two decades.
Writing in the British Medical Journal (7/2/94), Stephen Farrow noted that the finding of a decrease in sperm concentration ``led to much speculation about the cause: oestrogen or pesticides in meat or water were the popular culprits,'' as in a BBC special entitled ``Assault on the male.'' Farrow thought the first question to ask was whether the decline was fact or fiction; his answer is that it is an artefact due to misapplication of sophisticated statistics such as regression analysis.
As to the cancer fears, the late William Hazeltine, Ph.D., presented an analysis at a seminar sponsored by the International Center for Scientific Ecology on May 10, 1993. In his assessment, evidence for the carcinogenicity of DDT is limited and weak. Nonmalignant hepatomas were induced in mice fed maximum tolerated doses of DDT for their entire life. Hazeltine was skeptical of a study by Wolff et al. (JNCI 1993;85:648-652) purporting to show higher levels of organochlorine residues in women with breast cancer. The levels were at the limit of detection of the gas chromatography system used.
He noted some surprising beneficial effects. In a three-generational study that dosed Beagle dogs with 10 ppm DDT in their feed, the technicians began to refer to the untreated controls as the ``DDT deficient animals,'' because the treated animals seemed to do noticeably better (and autopsy revealed no adverse effects). Dosing rats with DDT before feeding them the known carcinogen dimethylbenzanthracene (DMBA) reduced the incidence of leukemia and mammary tumors.
Hazeltine thought that increased levels of DDT in the tissues of people in agricultural areas might account for a decreased incidence of infant jaundice. One paper reported the use of DDT in place of phenobarbital in a 17-year-old boy with juvenile jaundice; the bilirubin remained low for seven months after the end of DDT therapy (Lancet II(7161):4-6, 7/5/69).
The protective effects were attributed to the induction of liver enzymes that metabolize toxins (and hormones), whether from external sources or the body's own metabolism.
The assault on the male may be a fact; but the ban on DDT and other organochlorines is a symptom, not a cure.