1 Below are three (3) excellent articles about BPA. Scroll down to see all three: What is BPA (bisphenol A)? Is BPA harmful? Last updated: Friday 26 September 2014 Bisphenol A, often known as BPA is a chemical found in hard plastics and the coatings of food and drinks cans which can behave in a similar way to estrogen and other hormones in the human body. BPA is used to make many products, including water bottles, baby bottles, dental fillings and sealants, dental devices, medical devices, eyeglass lenses, DVDs and CDs, household electronic and sports equipment. BPA can also be found in epoxy resins which is used as coatings inside food and drinks cans. Bisphenol A is an endocrine disruptor - a substance which interferes with the production, secretion, transport, action, function and elimination of natural hormones. BPA can imitate our body's own hormones in a way that could be hazardous for health. Babies and young children are said to be especially sensitive to the effects of BPA. Although public authorities set BPA safety levels, many experts believe these levels should be reviewed after a number of recent studies were published. The Endocrine Society, USA, in 2009 expressed concern in a public statement over current human exposure to BPA. A CDC (Centers for Disease Control and Prevention) study found 95% of adult human urine samples and 93% of samples in children had bisphenol A. What are the possible health effects of bisphenol A (BPA) on humans? Reproductive disorders - scientists from Brigham and Women's Hospital showed that BPA exposure can affect egg maturation in humans. Male impotence - Dr De-Kun Li, a reproductive and perinatal epidemiologist at Kaiser Permanente's Division of Research in Oakland, California, reported in the journal Human Reproduction that BPA exposure may raise the risk of erectile dysfunction. Sexual desire and problems with ejaculation were also linked to BPA exposure among men. Heart disease (females) - BPA can cause heart disease in women, scientists at the University of Cincinnati found.
14
Embed
What is BPA (bisphenol A)? Is BPA harmful?...demand BPA-free products. This past year the FDA outlawed the use of BPA in baby-related products. This was in response to a plea from
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Below are three (3) excellent articles about BPA.
Scroll down to see all three:
What is BPA (bisphenol A)? Is BPA harmful?
Last updated: Friday 26 September 2014
Bisphenol A, often known as BPA is a chemical found in hard plastics and the coatings of food and drinks cans which can behave in a similar way to estrogen and other hormones in the human body. BPA is used to make many products, including water bottles, baby bottles, dental fillings and sealants, dental devices, medical devices, eyeglass lenses, DVDs and CDs, household electronic and sports equipment. BPA can also be found in epoxy resins which is used as coatings inside food and drinks cans. Bisphenol A is an endocrine disruptor - a substance which interferes with the production, secretion, transport, action, function and elimination of natural hormones. BPA can imitate our body's own hormones in a way that could be hazardous for health. Babies and young children are said to be especially sensitive to the effects of BPA. Although public authorities set BPA safety levels, many experts believe these levels should be reviewed after a number of recent studies were published. The Endocrine Society, USA, in 2009 expressed concern in a public statement over current human exposure to BPA. A CDC (Centers for Disease Control and Prevention) study found 95% of adult human urine samples and 93% of samples in children had bisphenol A.
What are the possible health effects of bisphenol A (BPA) on
humans?
Reproductive disorders - scientists from Brigham and Women's Hospital showed that BPA exposure can affect egg maturation in humans.
Male impotence - Dr De-Kun Li, a reproductive and perinatal epidemiologist at Kaiser Permanente's Division of Research in Oakland, California, reported in the journal Human Reproduction that BPA exposure may raise the risk of erectile dysfunction. Sexual desire and problems with ejaculation were also linked to BPA exposure among men.
Heart disease (females) - BPA can cause heart disease in women, scientists at the University of Cincinnati found.
Heart disease in adults - another US study linked BPA exposure to diabetes and heart disease in adults.
Sex hormones in men - an August 2010 study linked BPA exposure to changes in sex hormones in men.
Type 2 diabetes - A UK study linked higher levels of urinary BPA to type 2 diabetes, cardiovascular disease and liver-enzyme abnormalities.
Brain function, memory, learning - US researchers linked BPA exposure to loss of connections between brain cells in primates, potential problems with memory and learning, as well as depression.
Women's eggs - Californian researchers found that exposure to bisphenol A may affect the quality of a woman's eggs retrieved for in vitro fertilization (IVF).
Chemotherapy - University of Cincinnati scientists found that BPA exposure may reduce chemotherapy treatment efficacy.
Breast cancer - A Yale School of Medicine study found a possible increase in breast cancer risk among females exposed to BPA and DES (Diethylstilbestrol) in the womb.
Asthma - A US study suggested a link between increasing asthma rates and a particular threshold of BPA.
A Bisphenol exposure sources
Experts say the main source of human BPA exposure is from bisphenol A leached from the plastic lining of canned foods. BPA found in polycarbonate plastics, especially when cleaned with harsh detergents, high-temperature liquids, or those containing acidic liquids are also sources. Scientists from Health Canada reported low but measurable levels of BPA in canned sodas (soft drinks). BPA is an ingredient in the internal coating of food and drink cans, used to prevent direct contact with the metal. Thermal paper and carbonless paper also have varying levels of BPA which can get onto your hands and fingers. Examples of thermal paper commonly used are movie theater tickets, labels and airline tickets. Experts say the problem is not absorption through the skin, much more likely transference from hands/fingers into the mouth (ingestion). One study found that BPA levels can rise by two-thirds if people drink from polycarbonate bottles. A breastfed baby will have much lower levels of BPA compared to a bottle-fed baby.
According to various consumer groups, those wishing to reduce BPA exposure should not eat/drink canned foods and drinks unless the labeling says it is BPA free. Scientist from the Silent Spring Institute, USA and Breast Cancer Fund, USA report that after just three days on a fresh food diet, BPA and DEHP levels in children and adults fell considerably. You should not microwave foods in plastic containers. Plastic containers should not be washed in the dishwasher. You should avoid cleaning plastic containers with harsh detergents.
Fetus, infants and young children
Very young and unborn humans are more susceptible to BPA exposure and its effects than adults. This is probably because they cannot eliminate xenobiotics so well. A xenobiotic is a substance found in an organism which is not generally produced or expected to be present in it. Most urine studies have found higher BPA concentrations in children than adults. Bottle-fed babies are the most exposed.
BPA and the environment
According to studies, BPA can undermine the reproduction and development of aquatic life, especially fishes. There is also compelling evidence that aquatic invertebrates, reptiles and amphibians are also affected. Ocean-borne plastic trash can contaminate the environment. BPA is a major soil pollutant which can interfere with nitrogen fixation at the roots of several types of plants. A report by the Royal Society, UK, found that BPA has been shown to undermine the reproduction of all animal groups studied. It was also found to induce genetic abnormalities in amphibians and crustaceans. A Canadian study reported that rivers with BPA contamination had a much higher female-than-male proportion of some types of fishes. Written by Christian Nordqvist
Posted: 03/07/2014 3:34 pm EST Updated: 05/07/2014 5:59 am EDT
I'm was on Dr. Oz last week talking about my concerns about BPA and I wanted to give you more details about where BPA
hides and why you should be avoiding BPA. BPA (bisphenol A) is a chemical that acts as a synthetic estrogen. This means
that BPA disrupts our own hormone levels and hormone balance. This chemical can be found frequently in food storage
containers, including plastics and cans, including soda cans. What people may not realize is that BPA can leech into the
food or a liquid that they're consuming if it has been stored in a can or bottle containing BPA.
The FDA recently released two studies about the safety of BPA that they believe supports their current safety limits, but
they do state that there are going to be longer studies on going. Here's the rub though, the two studies they did were
conducted in rodents. There have been over 90 studies of BPA on humans, and more than 50 of these were published in the
past year! We are only just starting to the effects of BPA on humans and it seems to be much different than the effects we're
seeing in rats. A large study reviewing the effects of BPA on human health was published in December, 2013. The authors
concluded that there is "increasing support that environmental BPA exposure can be harmful to humans."
We are just beginning to understand the enormity of this problem. We as consumers need to be conscious and aware and
demand BPA-free products. This past year the FDA outlawed the use of BPA in baby-related products. This was in response
to a plea from manufacturer's that had already stopped using BPA in their products due to consumer demands. France plans
on outlawing BPA in all food-related products by 2015. Why is it that the U.S. is so far behind in protecting our consumers?
We need to be savvy consumers and continue to send the message to manufacturers that we will not accept products
manufactured with BPA.
As an OB/GYN and hormone-replacement therapy specialist, I always discuss with my patients the importance of trying to
avoid BPA. In the scientific review of BPA mentioned above, BPA was shown in studies to increase growth of fibroid
tumors in the uterus and interfere with fertility treatments and was also linked to development of diabetes or a heart attack
and may even increase the risk of breast cancer. Because BPA is a synthetic estrogen (xenoestrogen) it has the potential to
lead to hormonal imbalances, especially an overload of estrogen which may result in fatigue, weight issues, anxiety, poor
sleep and other potential health concerns, causing suffering needlessly and unknowingly.
BPA can be found almost anywhere. So although it may be difficult to eliminate from your life entirely, there are steps you
can take to protect your family from the dangers of consumer-based toxins.
Here are some tips to help reduce your BPA exposure:
Stop buying plastic water bottles that don't have a recycle code of 1, 2 or 5. You can also opt for a reusable, BPA-free, stainless steel or glass water bottle.
If you are using a plastic water bottle, you should avoid drinking from any that have been frozen and/or exposed to sunlight or high temperatures.
Store leftover foods in glass containers instead of plastic. Remove all cellophane or plastic wrap before microwaving any food. The heat can cause
the chemicals to contaminate your food. Automatic, plastic coffeemakers may also contain BPA. As the plastic is heated, BPA can
leech out into your coffee. An old-fashioned French press is great alternative. Cut down on canned foods. Recent studies have showed that BPA levels were 1,221
percent higher in people who consumed canned soup for five days, when compared to people who consumed fresh soup for the same time period.
Look for canned food labeled "BPA free" from brands like Eden Foods and others. Avoid handling receipts that are printed on thermal paper. BPA is used as a color
developer for the dye the printer uses. You can always ask for the cashier to put the receipt in the bag to avoid contact.
Reducing exposure to chemicals like BPA is one big step you can take for your and your family toward improving your
The Scary New Evidence on BPA-Free Plastics [1] How Industry and the Feds Suppressed Evidence That Plastics Wreak Havoc on Our
Hormones [2] The Frog of War: One Biologist's Crusade Against Atrazine [3] Waiter, There's BPA in My Soup [4] Which 9 Household Items Will Make Your Hormones Go Haywire? [5] Buying Local and Organic? You're Still Eating Plastic Chemicals [6]
He pondered these findings as the center prepared for its anniversary celebration in October 2011. That evening, Green, a
slight man with scruffy blond hair and pale-blue eyes, took the stage and set Juliette's sippy cups on the podium. He
recounted their nightly standoffs [7]. "When she wins…every time I worry about what are the health impacts of the
chemicals leaching out of that sippy cup," he said, before listing some of the problems linked to those chemicals—cancer,
diabetes, obesity. To help solve the riddle, he said, his organization planned to test BPA-free sippy cups for estrogenlike
chemicals.
The center shipped Juliette's plastic cup, along with 17 others purchased from Target, Walmart, and Babies R Us, to
CertiChem [8], a lab in Austin, Texas. More than a quarter—including Juliette's—came back positive for estrogenic
activity. These results mirrored the lab's findings in its broader National Institutes of Health-funded research on BPA-free
plastics. CertiChem and its founder, George Bittner [9], who is also a professor of neurobiology at the University of Texas-
Austin, had recently coauthored a paper [10] in the NIH journal Environmental Health Perspectives. It reported that "almost
all" commercially available plastics that were tested leached synthetic estrogens—even when they weren't exposed to
conditions known to unlock potentially harmful chemicals, such as the heat of a microwave, the steam of a dishwasher, or
the sun's ultraviolet rays. According to Bittner's research, some BPA-free products actually released synthetic estrogens that
were more potent than BPA.
Estrogen plays a key role in everything from bone growth to ovulation to heart function. Too much or too little, particularly
in utero or during early childhood, can alter brain and organ development, leading to disease later in life. Elevated estrogen
levels generally increase a woman's risk of breast cancer.
Estrogenic chemicals found in many common products have been linked to a litany of problems in humans and animals.
According to one study, the pesticide atrazine can turn male frogs female. DES, which was once prescribed to prevent
miscarriages, caused obesity, rare vaginal tumors, infertility, and testicular growths among
those exposed in utero. Scientists have tied BPA to ailments including asthma, cancer,
Those startling results set off a bitter fight with the $375-billion-a-year plastics industry. The American Chemistry Council,
which lobbies for plastics makers and has sought to refute the science linking BPA to health problems, has teamed up with
Tennessee-based Eastman Chemical [14]—the maker of Tritan, a widely used plastic marketed as being free of estrogenic
activity—in a campaign to discredit Bittner and his research. The company has gone so far as to tell corporate customers
that the Environmental Protection Agency (EPA) rejected Bittner's testing methods. (It hasn't.) Eastman also sued
CertiChem and its sister company, PlastiPure, to prevent them from publicizing their findings that Tritan is estrogenic,
convincing a jury that its product displayed no estrogenic activity. And it launched a PR blitz touting Tritan's safety,
targeting the group most vulnerable to synthetic estrogens: families with young children. "It can be difficult for consumers
to tell what is really safe," the vice president of Eastman's specialty plastics division, Lucian Boldea, said in one web video
[15], before an image of a pregnant woman flickered across the screen. With Tritan, he added, "consumers can feel
confident that the material used in their products is free of estrogenic activity."
"A poison kills you," says biology professor Frederick vom Saal. "A chemical like BPA reprograms your cells and ends up causing a disease in your grandchild that kills him."
Eastman's offensive is just the latest in a wide-ranging industry campaign to cast doubt on the potential dangers of plastics
in food containers, packaging, and toys—a campaign that closely resembles the methods Big Tobacco used to stifle
scientific evidence about the dangers of smoking. Indeed, in many cases, the plastics and chemical industries have relied on
the same scientists and consultants who defended Big Tobacco. These efforts, detailed in internal industry documents
revealed during Bittner's legal battle with Eastman, have sown public confusion and stymied US regulation, even as BPA
bans have sprung up elsewhere in the world. They have also squelched debate about the safety of plastics more generally.
All the while, evidence is mounting that the products so prevalent in our daily lives may be leaching toxic chemicals into
our bodies, with consequences affecting not just us, but many generations to come.
The fight over the safety of plastics traces back to 1987, when Theo Colborn, a 60-year-old grandmother with a recent Ph.D.
in zoology [16], was hired to investigate mysterious health problems in wildlife around the Great Lakes. Working for the
Washington, DC-based Conservation Foundation (now part of the World Wildlife Fund), she began collecting research
papers. Before long, her tiny office was stacked floor to ceiling with cardboard boxes of studies detailing a bewildering
array of maladies—cancer, shrunken sexual organs, plummeting fertility, immune suppression, birds born with crossed
beaks and missing eyes. Some species also suffered from a bizarre syndrome that caused seemingly healthy chicks to waste
away and die.
While the afflictions and species varied widely, Colborn eventually realized they had two factors in common: The young
were hardest hit, and, in one way or another, all of the animals' symptoms were linked to the endocrine system, the network
of glands that controls growth, metabolism, and brain function, with hormones as its chemical messengers. The system also
plays a key role in fetal development. Colborn suspected that synthetic hormones in pesticides, plastics, and other products
acted as "hand-me-down poisons," with parents' exposure causing affliction in their offspring. Initially, her colleagues were
skeptical. But Colborn collected data and tissue samples from far-flung wildlife populations and unearthed previously
overlooked studies that supported her theory. By 1996, when Colborn copublished her landmark book Our Stolen Future
[17], she had won over many skeptics. Based partly on her research, Congress passed a law that year requiring the EPA to
screen some 80,000 chemicals—most of which had never undergone any type of safety testing—for endocrine-disrupting
effects and report back by 2000.
Around this time, the University of Missouri's vom Saal, a garrulous biologist who previously worked as a bush pilot in
Kenya, began studying the effects of synthetic estrogens on fetal mouse development. The first substance he tested was
BPA, a chemical used in clear, hard plastics, particularly the variety known as polycarbonate, to make them more flexible
and durable. (It's also found in everyday items, from dental sealants and hospital blood bags to cash register receipts and the
lining of tin cans.) Naturally occurring estrogens bind with proteins in the blood, limiting the amount that reaches estrogen
receptors. But vom Saal found this wasn't true of BPA, which bypassed the body's natural barrier system and burrowed deep
into the cells of laboratory mice.
Vom Saal suspected this would make BPA "a hell of a lot more potent" in small doses. Working with colleagues Susan
Nagel and Wade Welshons [18], a professor of veterinary biology, he began testing the effects of BPA at amounts 25 times
lower than the EPA's safety threshold. In the late 1990s, they published two studies finding that male mice whose mothers
were exposed to these low doses during pregnancy had enlarged prostates and low sperm counts. Even in microscopic
quantities, it seemed, BPA could cause the kinds of dire health problems Colborn had found in wildlife. Before long, other
scientists began turning up ailments among animals exposed to minute doses of BPA.
These findings posed a direct threat to plastics and chemical makers, which fought back using tactics the tobacco makers
had refined to an art form. By the late 1990s, when tobacco companies agreed to drop deceptive marketing practices under a
settlement agreement with 46 states, many of the scientists and consultants on the industry's payroll transitioned seamlessly
into defending BPA.
Plastics and chemical interests worked closely with the Weinberg Group, which had run Big Tobacco's White Coat Project
[19]—an effort to recruit scientists to create doubt about the health effects of secondhand smoke. Soon Weinberg, which
bills itself as a "product defense" firm, was churning out white papers and lobbying regulators. It also underwrote a trade
group with its own scientific journal, Regulatory Toxicology and Pharmacology, which published studies finding BPA was
safe.
The industry also worked hand in glove with the Harvard Center for Risk Analysis, a think tank affiliated with the
university's school of public health that has a history of accepting donations from corporations and then publishing research
favorable to their products. In the early 1990s, its founder, John D. Graham—who was later tapped as George W. Bush's
regulatory czar—lobbied to quash an EPA finding [20] that secondhand smoke caused lung cancer, while soliciting large
contributions from Philip Morris.
In 2001, as studies on BPA stacked up, the American Chemistry Council enlisted the
center to convene a panel of scientists to investigate low-dose BPA. The center paid
panelists $12,000 to attend three meetings, according to Fast Company [21]. Their final
report, released in 2004, drew on just a few industry-favored studies and concluded that the
evidence that low-dose BPA exposure harmed human health was "very weak." By this
point, roughly 100 studies on low-dose BPA were in circulation. Not a single industry-
funded study found it harmful [22], but 90 percent of those by government-funded
scientists discovered dramatic effects, ranging from an increased breast cancer risk to
hyperactivity. Four of the 12 panelists later insisted the center scrub their names from the
report because of questions about its accuracy.
Chemical interests, meanwhile, forged deep inroads with the Bush administration, allowing
them to covertly steer the regulatory process. For decades, the Food and Drug
Administration has assured lawmakers and the public that BPA is safe in low doses. But a 2008 investigation by the
Milwaukee Journal Sentinel [23] revealed that the agency had relied on industry lobbyists to track and evaluate BPA
research, and had based its safety assessment largely on two industry-funded studies—one of which had never been
published or peer reviewed.
The panel the EPA appointed to develop guidelines for its congressionally mandated endocrine disruptor screening was also
stocked with industry-backed scientists. It included Chris Borgert, a toxicology consultant who had worked closely with
Philip Morris to discredit EPA research on secondhand smoke. He later served as the president of the International Society
of Regulatory Toxicology and Pharmacology, the Weinberg Group-sponsored outfit, which met in the offices of a plastics
lobbyist.
Members of the EPA panel say Borgert seemed determined to sandbag the process. "He was always delaying, always trying
to confuse the issue," recalls one participant. And the screening approach the EPA settled on came straight from the
industry's playbook. Among other things, the chemicals would be tested on a type of rat known as the Charles River
Sprague Dawley—which, oddly, doesn't respond to synthetic hormones like BPA.
"Like the tobacco companies, they want to set up a standard of proof that is unreachable," says Stanton Glantz. "If they set the standard of proof, they've won the fight."
How best to test for estrogenic activity would become a key front in the fight over plastic safety. The American Chemistry
Council joined forces with an unlikely ally, PETA, to fight large-scale chemical-safety testing on animals. At the same time,