Time Line Of Endocrine Disruption And Man Made Chemicals

[Guest guest]

http://www.westonaprice.org/healthissues/timeline.html

 

THE WESTON A. PRICE FOUNDATION

 

Time Line Of Endocrine Disruption And Man Made Chemicals

 

 

The following timeline is based on a PBS feature aired in February of 1998 and

featuring interviews with Theo Colborn, author of Our Stolen Future, Lois J.

Guillette, PhD, and Fredrick Vom Saal.

 

1923 First estrogen bioassay is developed. The test detects estrogenic activity

in biological extracts and determines relative potencies of compounds and mixed

natural materials.

 

1929 Commercial production of PCBs begins in the United States in response to

the electrical industry’s need for a safer cooling and insulating fluid for

industrial transformers and capacitors.

 

1938 British scientist and physician Edward Charles Dodds announces the

synthesis of a chemical that acted in the body like a natural estrogen. Called

DES, it is hailed by leading researchers and gynecologists as a wonder drug with

a host of potential uses. (Dodds was later knighted for his scientific

achievement.) Soon after Dodds invents DES, researchers in the United States

begin giving the synthetic hormone to women with problem pregnancies. The

massive experiment would eventually involve an estimated 4.8 million pregnant

women worldwide.

 

1948 Paul Muller is awarded a Nobel Prize in medicine for discovering the

insect-killing properties of DDT.

 

1950 DDT is shown to disrupt sexual development in roosters—possibly by acting

as a hormone. Scientists V.F. Lindeman and Howard Burlington find that young

roosters treated with DDT fail to develop normal male sex characteristics, such

as combs and wattles. The pesticide also stunted the growth of the animals’

testes. These scientists noted a similarity between DDT and DES, a synthetic

estrogen given to women for problem pregnancies. DDT, they observe, “may exert

an estrogen-like action” on the animal in question.

 

1952 By this date, 4 separate scientific studies show women treated with DES to

prevent miscarriage did no better than those treated with alternatives such as

bed rest or sedatives. Further analysis will show that DES actually increases

the number of miscarriages, premature births and deaths among infants.

 

1962 Silent Spring is published. Rachel Carson’s book describes health problems

observed in wildlife such as eggshell thinning, deformities and population

declines. Carson links these adverse effects to exposure to pesticides and other

synthetic chemicals.

 

1963 Study shows that newborn mice receiving estrogen injections developed

tissue pathologies such as cysts, cancers and lesions. Results indicate that

exposure to naturally occurring hormones early in life can produce harmful

health effects and point to possible early-life causes of cancer in adult human

populations.

 

1968 DDT is shown to be estrogenic in mammals and birds.

 

1971 DES is linked to vaginal cancer in daughters whose mothers had taken the

drug during the first three months of pregnancy. By this date, millions of

pregnant women had received prescriptions from physicians for DES. The US Food

and Drug Administration directs doctors not to prescribe DES to pregnant women

and bans the drug for animal use.

 

1972 DDT use is restricted in agriculture by the US Environmental Protection

Agency.

 

1973 International Joint Commission (IJC) for the US and Canada singles out

first “Areas of Concern” in the Great Lakes region, noting extensive pollution

and threats to wildlife.

 

1976 DES is shown to cause developmental abnormalities in male mice and

reproductive problems in humans.

 

1977 Use and manufacture of PCBs restricted by the U.S. Environmental Protection

Agency. PCBs continue to be manufactured and sold overseas .

 

1978 Great Lakes Water Quality Agreement between US and Canada calls for virtual

elimination of persistent toxic substances from Great Lakes basin.

 

1979 National Institute of Environmental Health Sciences holds conference

entitled: Estrogens in the Environment I. Presented papers identify and evaluate

both advertent and inadvertent hormone mimics. Manufacture of PCBs banned in the

US, but not their use or storage.

 

1982 DES is shown to cause developmental abnormalities and vaginal cancer in

female mice.

 

1983 Responding to public concern over dioxin contamination at Times Beach, Love

Canal, Jacksonville and other sites, the US Congress directs the EPA to conduct

a National Dioxin Study to determine the extent of contamination nationwide.

 

1985 National Institute of Environmental Health Sciences holds a conference

called Estrogens in the Environment II: Influences on Development. Presentations

address the effects of environmental estrogens on puberty in young children.

Also noted is the ubiquitous nature of the contaminants, their potency and their

potential impact on public and environmental health. EPA’s Dioxin Risk

Assessment classifies dioxin as a known animal and probable human carcinogen,

setting the lowest “safe exposure level” on record.

 

1985 Eight Great Lakes states develop remedial action plans to address

environmental damage seen in IJC-targeted “Areas of Concern.”

 

1986 Documents are leaked to Greenpeace showing EPA agreed to demands from the

paper industry to keep results of National Dioxin Survey secret. Under threat of

lawsuit, EPA releases National Dioxin Survey. The study finds dioxin is present

in discharge from paper mills and in finished paper products (due to chlorine

bleaching of white paper).

 

1986 Paper industry pressures EPA to reconsider its 1985 Dioxin Risk Assessment

in hopes of obtaining a less damaging judgment on dioxin’s health effects.

 

1988 EPA begins its first reassessment of dioxin.

 

1990 The EPA and the Chlorine Institute (an industry group) co-sponsor the

Banbury Conference on Dioxin, which takes place on Long Island, New York.

Conference attendees reach a consensus on dioxin’s probable mechanism of action.

Theo Colborn co-authors “Great Lakes, Great Legacy?,” detailing developmental,

reproductive, metabolic and behavioral damage to wildlife from persistent

chemical pollutants.

 

1990 Fifth Biennial report of IJC puts threat in plain language, saying that the

principal danger of persistent organochlorine chemicals is to the fetus.

 

1990 Environmental groups around the Great Lakes form the Zero Discharge

Alliance to oppose production of bioaccumulative toxic substances.

 

1991 Theo Colborn helps organize a conference called “Chemically Induced

Alterations in Sexual Development: The Wildlife-Human Connection” and held at

Wingspread in Racine, Wisconsin. For the first time, scientists from many

disciplines are brought together to discuss concerns about endocrine-disrupting

chemicals in the environment. Participants present evidence that compounds may

have deleterious effects on sexual development in a variety of wildlife species.

Possible impacts include reproductive system abnormalities, reduced fertility,

behavioral abnormalities, and population declines—particularly in top predators.

Researchers Ana Soto and Carlos Sonnenschein report that some plastic compounds

widely used in a variety of consumer products are estrogenic in laboratory

research.

 

1991 The Chlorine Institute (an industry group) prematurely issues a press

release stating that below a certain threshold of exposure, dioxin has no

adverse effects. Group makes false claim that this was the consensus of the

Banbury Conference.

 

1991 EPA administrator Bill Reilly states publicly that dioxin seems less

dangerous than previously thought. He initiates a second EPA reassessment of

dioxin.

 

1991 Greenpeace tours 40 Great Lakes cities by boat in preparation for upcoming

IJC meeting in Traverse City, Michigan. The publicity campaign focuses on the

goal of zero dioxin discharge by the paper industry. Greenpeace distributes a

report entitled: “The Product is the Poison: The Case for a Chlorine Phase-Out.”

 

1992 Sixth Biennial Report of the IJC calls for a phase-out of chlorine as an

industrial feedstock. Drinking water and pharmaceutical uses are exempted.

Environmental groups and industry are surprised by this wide-reaching

recommendation.

 

1992 Physician Niels Skakkebaek publishes a paper demonstrating that human sperm

counts may have declined 50 percent over the last 50 years.

 

1993 Referring to the perceived decrease in human sperm counts, scientist Lou

Guillette tells the US Congress, “Every man sitting in this room today is half

the man his grandfather was, and the question is, are our children going to be

half the men we are?” A link between environmental estrogens and male

reproductive problems is hypothesized in scientific papers.

 

1993 Chemical Manufacturers’ Association forms the Chlorine Chemistry Council

(CCC) to promote the industry’s agenda in the debate over chlorine chemistry.

CCC launches a public relations campaign, including television advertisements

asserting the need for chlorine.

 

1994 EPA releases a Public Review Draft of its Dioxin Reassessment. It covers

dioxin, dioxin-like PCBs and furans. The report concludes that these chemicals

cause harm at levels similar to those seen in the general public. In addition to

cancer, potential damage is seen to the immune, nervous and reproductive

systems.

 

1995 The National Academy of Sciences and National Research Council sponsor a

panel study called “Hormone Related Toxicants in the Environment.” The EPA’s

Science Advisory Board reviews draft of Dioxin Reassessment.

 

1996 The topic of endocrine disrupters is popularized with the publication of

Our Stolen Future, which is co-authored by Theo Colborn and includes an

introduction by U.S Vice President Al Gore.

 

1996 President Clinton signs the Food Quality Protection Act and amendments to

the Safe Drinking Water Act, establishing the EPA’s Endocrine Disruptor

Screening and Testing Advisory Committee (EDSTAC). EDSTAC is a unique advisory

committee of 40 members from industry, academia, government and environmental

groups. It is charged by Congress to develop a chemical screening program for

endocrine disruptors by 1998, and to implement the program by August, 1999.

 

1996 Scientist Lou Guillette publishes his finding that male alligators in

Florida’s Lake Apopka have strikingly low levels of testosterone and abnormally

small phallus size. Pesticide residues in this contaminated lake appear to have

“feminized” the alligators there.

 

1996 Psychologists Sandra and Joe Jacobson report that children exposed to high

levels of PCBs before birth have as much as a 6.2 point IQ deficit later in

life.

 

1996 Dr. Harry Fisch publishes a study refuting any decline in US sperm counts.

He found, instead, striking geographical variation in sperm counts across the

U.S. While sperm counts remained constant in a given region between 1970 and

1994, New York had higher counts than Minnesota, which had higher counts than

California. Fisch thinks that the geographical variation may have confused other

research that, in 1992, showed a worldwide decline in human sperm counts.

 

1997 Work by researcher Dr. Fredrick vom Saal shows that bisphenol-A, a

component of polycarbonate plastic, can alter the reproductive development of

lab mice at extremely low doses. Bisphenol-A mimics the natural sex hormone

estrogen. Male mice exposed to this plastic during fetal development have

premanently enlarged prostates and lower sperm counts. The effects occur at

doses near those that humans are exposed to each day from sources like food

packaging and dental sealants.

 

1997 A study by the Centers for Disease Control and Prevention shows that

hypospadias, a hormone-dependent genital defect, is on the rise in baby boys.

 

1997 The National Institute of Environmental Health Sciences (HHS) holds its

fourth major conference on estrogens in the environment in Arlington VA.

Numerous scientific papers and reports are presented on toxicology, risk

assessment and research for this emerging health concern.

 

1997 Tulane University scientists retract an environmental estrogen study

published in a June 1996 issue of Science. The report had claimed that

combinations of pesticides were as much as 1,600 times more potent as

environmental estrogens than the individual pesticides. The research results

couldn’t be replicated and the study was retracted.

 

1998 The National Academy of Sciences Institute of Medicine is expected to issue

its report on hormone-related toxicants in the environment. The NAS panel will

critically review the literature, identify known and suspected impacts on fish,

wildlife and humans, and recommend research, monitoring and testing priorities,

among other activities. By August, the EPA committee EDSTAC is mandated to

develop recommendations on how to screen and test chemicals for their potential

to disrupt hormone function in humans and wildlife. EDSTAC’s final plenary

session is set for June 17-18 in Washington, D.C.

 

1998 A research paper published in the Journal of the American Medical

Association reports that the proportion of males to females born has been

declining in the US and Canada since the 1970s and in Denmark and the

Netherlands between 1950 and 1994. The study’s authors suggest that endocrine

disruptors may play a role, pointing to increased numbers of male reproductive

disorders. When the study is reported in the popular press, some scientists

downplay the significance of the reported trend.

 

1998 Vice President Al Gore urges the chemical industry to voluntarily release

vital health information about thousands of commonly used chemicals. He says

such a move would “empower citizens with new knowledge” to safeguard their

neighborhoods against potential chemical hazards.

 

1998 The United Nations Environment Programme meets in Montreal to expand

throughout the world an agreement to ban, phase out or limit the production of

Persistent Organic Pollutants (POPs). POPs are chemical substances that persist

in the environment, bioaccumulate through the food web, and pose a risk of

causing adverse effects on human health and the environment. Persistent Organic

Pollutants include: aldrin, dieldrin, endrin, chlordane, DDT, heptachlor,

hexachlorobenzene, mirex, toxaphene, PCBs, dioxins, and furans.

 

1998 On Earth Day, the Chemical Manufacturers’ Association announces it will

urge its members to voluntarily increase their health effects testing program of

industrial chemicals to 100 chemicals a year by 2003.

 

 

 

 

 

 

 

 

 

Gettingwell- / Vitamins, Herbs, Aminos, etc.

 

To , e-mail to: Gettingwell-

Or, go to our group site: Gettingwell

 

 

 

 

Send Flowers for Valentine's Day