So the DDT ban discussion is alive. Good!
<i>Now this study should be able to teach us a lot. But in this simple statement they don't say how those humans died . How old they were???</i>
The statement you are referring to is from me, not from the study. I must admit that I quoted it without going to my database, (my apologies) so the information I kept there is this:
<i>Tests by Dr. Wayland Hayes for the U.S. Public Service involved feeding human volunteers tremendous quantities of DDT to see if any adverse effects developed. The men ingested up to 35 mg of DDT in their food, <b>every day for 18 months</b>, and had no resultant difficulties either at the time or within the following 6 to 10 years while they remained under observation. (Hayes, Weyland, 1956. <b><i>Effect of Known Repeated Oral Doses of DDT in Man"</b>, Journal of the American medical Association</i>, Vol. 162, pp. 890-897).</i>
I read a comment on that study, saying that the DDT intake was 21 to 27 months, so I quoted that. My database says the duration was 18 months. Even so, 18 months is ample time to show any deleterous effect --especially at the high dose of 35 milligrams (imagine that people were scared when they learned they were intaking 0,065 mg a day), then 35 mg would be a lethal dose. I keep telling you, I am very much alive after 4 years of 25 mg a day.
Quote: <b><I>(Hopefully you recognize your statements regarding DDT helping your cancer are non-scientific.)</i></b>
I did not recognize such a thing. My decision of ingesting DDT for preventing my prostate cancee from making a comeback, was based on the scientific studies I mentioned: (1) Wayland Hayes, (2) Charles Silinskas, (3) Edward R. Laws and Allan E. Okey. And from professor J. Gordon Edwards eating every year a spoonfull of DDT (about 6 grams) before his students at the Opening Class at the Univeristy of California at San Jose. He must be 90 years old by now.
justagirl: <i>Saying eating veggies full of DDT is healthy because of VIT's A and B is not the end as I can say that eating a veggie without DDT is healthier.</I>
Please show me where I said such a thing. i have never mentioned vitamins or anything of that kind. And your claim is a nice example of twisted logic. I have been insisting on the Golden Axiom of Toxicology: <b>"The Dose Makes the Poison"</b>, but you seem to keep forgetting it. If the "full of DDT" means 200 grams a day, I wouldn't recommend it at all. But if it means 25 mg a day, I strongly recommend it.
And justagirl made a point when she stated: <b>"...and you are quoting facts from many years ago ... I find it very interesting all of your facts are "old" ... Your search for the truth seems to be over as you still can't quote a source that is current.".</b>
Facts remain facts even after a million years have passed. There are "eternal, fixed laws" as Gravity, the laws relating to thermodynamics, chemical and physical laws, etc. If you fed DDT to rats back in 1968, and the rats didn't get cancer when treated with carcinogenics, they will keep doing the same thing today, if you repeat the experiment.
But why the scarcity of "new and updated" studies about the innocuousness of DDT? Money talks here. Those researchs were made at the time when the DDT hysteria was on the rise, but the levels of politics in science was still low. There were money for research then, but now there is not a single scientists that would get money from the government if he tried to investigate if DDT is really dangerous. On the contrary, he will get carloads of money if he tried to prove "definitely" that DDT is the worst poison ever made.
Moreover, why make a research that won't be accepted for publishing in "top level" scientific journals as Science, Nature, the New England Journal of Medicine, etc.? In the lecture given by professor J. Gordon Edwards at Dartmouth College in April 1999 he said this, when talking about the "thinning eggshells" studies by Dr. Bitman, widely accepted as "proof" of the effect of DDT on eggshell thinning:
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"<i>In my testimony before Congress, I presented information and I was highly critical of Bitman's work. The next year, Bitman repeated his experiments, and this time he added the adequate doses of calcium in the diets. The avians fed with DDT and DDD did not produce thin eggshells. The study was presented again to <i>Science</i> magazine for publishing. Unfortunately, the editor of Science always refused to print articles favorable to DDT, so this time he rejected Bitman's article. Instead, the article was published in <i>Poultry Science</i>, and poultry industry and honest scientists applauded when they saw the real results. Of course, circulation of that magazine was not as big as <i>Science's</i> so very few scientists had the opportunity of hearing about the retreat by Bitman of the accusations that DDT and DDE caused thinning in eggshells.
Why did <i>Science</i> rejected such studies? His editor, Philip Abelson, had previously informed Dr. Thomas Jukes that Science would never publish any article that were not contrary to DDT. He even refused to consider for publication a manuscript by the WHO (World Health Organization) favourable to DDT. As a result, articles on DDT were always written by the members of the same brotherhood, and peer-review became a shame. DDT authors were quoting each other and supported each other claims. There wwere not accepted any dissenting views. Without the refuge given by <i>Science</i>, the case of DDT would have been promptly archived!</i>
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But, if you want some "fresh" news about DDT, at the Conference held in South Africa on December 12th, 2000, DDT was removed from the "dirty dozen" (persistent chemicals in the environment) list and it has been approved for use in countries fighting malaria. Even so, the political pressures by US Embassies in those countries will make DDT hard to use. They would lose economic aid by the US. Could we call this blackmail?. It reminds me of Chicago in the 20s...
The DDT myth persists in the news as well as in the scientific literature. On April 21, 1993, Mary G. Wolff and colleagues published a study on DDT residues in blood and breast cancer in the Journal of National Cancer Institute ((Mary S. Wolff et all., 1993, <b<"Blood Levels of Organochlorine Residues and Risk of Breast Cancer"</b>, <i>Jour. Nat. Cancer Inst.</i>, (April 21) Vol. 85, No. 8, pp. 648-652). The findings were seized on by the media, including Associated Press and <i>Time</I> magazine, with headlines <b>"DDT linked to Risk of Breast Cancer"</b>, and <b>"Relentless DDT"</b>. The <i>New Yorker</I>, which had launched <i>Silent Spring"</i> in 1962, exulted on June 6m 1993, that <b>"Rachel Carson Lives"</b>.
One year later, a new study to correct the first was published by N. Krieger and coworkers in the Journal of the National Cancer Institute, covering a much larger group of subjects (150 vs. the 58 breast cancer patients in Wolff's report) and drawing on thousands of blood samples collected and frozen during the 1960s, when average DDE levels were four to five times higher. The 1994 report showed <b>no association</b> between serum levels of DDE and the risk of breast cancer.
This disproof of earlier claims did not make the headlines. There were no stories of <b>"DDT Not Linked to Breast Cancer"</b>, or <b>"DDT Relents"</b>. The New Yorker has not said that <b>"Rachel Carson Does Not Longer Lives, After All"</b>. Many activists may be expected to ignore the disproof of the 1993 claims and to link DDT falsely to cancer. The first, desired report is now "locked in" and has become a part of the evaluation of DDT by critics.
The British historian H.R. Trevor-Ropper wrote in 1962:
<blockquote>"<b>Whatever else history may say of Dr. Goebbels, it must credit him with one positive contribution to the science of politics--a terrible but a positive contribution. He created a system of propaganda, ironically styled public enlightment, which persuaded a people to believe that black was white."</b>
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I must add that Goebbels did that advising (ordering) his accomplices to <font color="red"><b>"Lie, lie, and lie! It will there something remain in the people's mind"</b></font>.
Should I mention more studies that would give the same results if they were repeated today? The California Department of Health was concerned about the effects of DDT on reproduction, and Dr. Alice Ottoboni, the department's toxicologist, consequently carried out extensive studies with rats and dogs during the 1960s and 1970. (Alice Ottoboni, 1969 <b>"The Effects of DDT on Reproduction in the Rat</b>", <i> Toxicol. Appl. Pharmacol.</i>, Vol. 14, pp. 79-81). Rats were fed levels of DDT of 0, 20, and 200 ppm in the diet. There was no apparent effect on fecundity of dams or viability of the young. The females receiving 20 ppm DDT had <b>a significantly longer average reproduction life span</b> (14.55 months) than their littermate controls (8.91 months). If you won't let me say that DDT prolonged the life span of rats, then you must allow me to say that "the lack of DDT in the diet shortened the life span of rats".
Ottoboni's studies with beagle dogs were through four generations, and 650 pups were born to parents that received 1, 5, and 10 milligrams (mg) of DDT <b>per kg of body weight per day.</b> (Here you may find a dose level that it is harmless: 10 mg DDT per kg of body weight.) There was no effect of DDT on survival, growth, and sex distribution of pups, nor was there any influence on morbidity or mortality or gross or histologic findings in any of the dogs. DDT-treated females had their first estrus cycles two to three months earlier then the control dogs. The highest level of DDT, in contrast to the control or 1 mg groups, was associated with <b>freedom from roundworm infection</b> in the pups.
More recently (1994) Unnur P. Thorgeirsson and coworkers reported (Unnur P. Thorgeirsson et al., <b>"Tumor Incidence in a Chemical Carcinogenesis Study of Non Human Primates"</b>, in the <i>Journal of Regulatory Toxicology and Applied Pharmacology</i>, (April), Vol. 19, No. 2, pp. 130-151), a 32-year study of chemical carcinogenesis using Old World monkeys, who live about 30 years, to test a variety of chemicals, including DDT.
In his DDT study, 25 monkeys were fed 20 mg/kg of DDT by mouth five times per week for 11 years. So far, 10 monkeys have died of various causes, and the other 15, ages 19 to 25, are in good health. The single cancer that occurred in a 20-year-old monkey cannot be attributed to DDT because of the monkey's age, and the fact that these monkeys have a spontaneous cancer rate of 3.2 percent. On the other hand, the common fungal food contaminant, aflatoxin B, and a compound produced in cooked meat, IQ, induced cancers in more than 60 percent of the animals.
These studies shows that DDT is not as dangerous as alleged by the anti-DDT brotherhood, and most of these studies at least suggest that it can a strong cancer preventive. In view of the factual evidence of its lack of carcinogenicity, and the evidence suggesting it could be a highly beneficial cancer preventive, why don't start doing research in this direction? That high can be the prejudice and hysteria against DDT?. I repeat: this is not sound science, it its pure hysteria. Neurosis and paranoia...
But there is the issue of DDT persistance, that you have mentioned as the main reason for its banning in the US. Because this post is too long --and I don't want to bore you with factual information-- I propose to continue on the subject of DDT persistance in the environment in further posts.