New Study Finds Miscarriage Risk Increases With BPA Exposure
Women exposed to high levels of bisphenol A (BPA) early in their pregnancy had an 83 percent greater risk of miscarriage than women with the lowest levels, according to new research.
The scientists said their new study adds to evidence that low levels of the ubiquitous chemical, used to make polycarbonate plastic and found in some food cans and paper receipts, may affect human reproduction.
The study involved 115 pregnant women who had visited a Stanford University fertility clinic within about four weeks of fertilization. The more BPA detected in the women’s blood, the higher their risk of miscarriage, according to the researchers.
“Couples suffering from infertility or recurrent miscarriages would be best advised to reduce BPA exposure because it has the potential to adversely affect fetal development,” wrote the scientists, led by Dr. Ruth Lathi, a Stanford University associate professor of obstetrics and gynecology. The study was published in the journal Fertility and Sterility.
However, the new study doesn’t mean BPA causes miscarriages. The findings were based on one or two blood tests early during the pregnancies, and more women would need to be tested to see if the results are replicated.
In addition, the women who participated were likely at high reproductive risk because they had been treated at a fertility center. That means the findings may not be relevant for the general population, said Emily Barrett, an assistant professor of obstetrics and gynecology at the University of Rochester’s Medical Center. She was not involved in the study.
Sixty-eight of the 115 women had miscarriages, which is roughly three times the rate of the U.S. population.
“This is not a typical population since these are women seeking fertility care,” Barrett said.
Despite the limitations, this is “another piece of evidence” linking the chemical to pregnancy problems, Barrett said.
In 2005, a smaller study in Japan found that 45 women who had three or more first-trimester miscarriages had three times more BPA in their blood than 32 women with no history of pregnancy problems.
For the new study, the scientists divided the women into four groups based on their BPA measurement, then compared their miscarriage rates. The women with the highest exposures had an 83 percent higher risk of miscarriage, while those in the second and third groups had increased risks of 58 percent and 30 percent.
“This study has the same flaw as other studies that attempt to measure BPA in blood at a single point in time and statistically associate that limited data with a health effect—in this case, miscarriage,” said Kathryn St. John, a spokesperson for the American Chemistry Council, which represents chemicals manufacturers, in a prepared statement.
Most miscarriages occur within the first seven weeks of pregnancy. The early stage tested in the new study is “certainly one period that’s very important” for measuring exposures, Barrett said.
About 90 percent of people tested in the U.S. have BPA in their bodies.
Barrett said that most researchers agree the current standard for measuring BPA in people is testing urine for total BPA, which includes both free form and conjugated. Free BPA is the form that is estrogenic and acts on the body. Lathi and colleagues measured only the conjugated form in blood.
University of Missouri professor Frederick vom Saal, a co-author of the study, said there are pros and cons to any measurement of BPA in people. Blood samples are more likely to be contaminated with free BPA from the environment but the study avoided that problem by looking only at conjugated, he said.
There is an ongoing scientific dispute over whether traces of BPA can harm people. The U.S. Food and Drug Administration (FDA) said BPA is safe at the low amounts that people are exposed to through foods. The agency released a study earlier this year that found BPA doesn’t affect the health of rats fed low doses. However, some academic researchers have called the FDA study flawed.
In 2008, a federal agency, the National Toxicology Program, determined that there was “negligible concern” that exposure of pregnant woman to BPA will harm fetuses or infants. Two years later, the Environmental Protection Agency announced an action plan to further investigate BPA, declaring it a chemical of concern.
Known risk factors for miscarriage include obesity, problems with the mother’s hormones, reproductive organs and immune system, smoking and drug and alcohol abuse.
Lathi and colleagues did not investigate how the women may have been exposed to BPA. She said that in the future the researchers would like to examine whether avoiding BPA during pregnancy lowers miscarriage risk.
“These are just regular pregnant women with what we think is regular exposure,” Lathi said. “There is nothing to make us think that our patients are more highly exposed than anyone else in the U.S.”
YOU MIGHT ALSO LIKE
The National Hurricane Center has run out of names for tropical storms this year and has now moved on to the Greek alphabet during an extremely active hurricane season. Late Monday night, Tropical Storm Beta became the ninth named storm to make landfall. That's the first time so many named storms have made landfall since 1916, when Woodrow Wilson was president, according to NBC News.
- Extreme Weather Suggests Future Climate Crisis Is Already Here ... ›
- Atlantic Faces Fifth 'Above-Normal' Hurricane Season in a Row ... ›
EcoWatch Daily Newsletter
By Karen L. Smith-Janssen
Colette Pichon Battle gave a December 2019 TEDWomen Talk on the stark realities of climate change displacement, and people took notice. The video racked up a million views in about two weeks. The attorney, founder, and executive director of the Gulf Coast Center for Law & Policy (GCCLP) advocates for climate justice in communities of color. Confronted with evidence showing how her own South Louisiana coastal home of Bayou Liberty will be lost to flooding in coming years, the 2019 Obama Fellow dedicates herself to helping others still reeling from the impacts of Katrina face the heavy toll that climate change has taken—and will take—on their lives and homelands. Her work focuses on strengthening multiracial coalitions, advocating for federal, state, and local disaster mitigation measures, and redirecting resources toward Black communities across the Gulf South.
Between 2000 and 2013, Earth lost an area of undisturbed ecosystems roughly the size of Mexico.
- Planting Projects, Backyard Habitats Can Re-Create Livable Natural ... ›
- Humans Are Destroying Wildlife at an Unprecedented Rate, New ... ›
- UN Biodiversity Chief: Humans Risk Living in an 'Empty World' With ... ›
- Scientists Warn Worse Pandemics Are on the Way if We Don't ... ›
- Coronavirus Pandemic Linked to Destruction of Wildlife and World's ... ›
By Stuart Braun
"These are not just wildfires, they are climate fires," Jay Inslee, Governor of Washington State, said as he stood amid the charred remains of the town of Malden west of Seattle earlier this month. "This is not an act of God," he added. "This has happened because we have changed the climate of the state of Washington in dramatic ways."
'These Aren't Wildfires'<p>Sam Ricketts, who led climate policy and strategy for Governor Jay Inslee's 2020 presidential campaign, tweeted on September 11 that "These aren't wildfires. These are #climatefires, driven by fossil fuel pollution."</p><p>"The rate and the strength and the devastation wrought by these disasters are fueled by climate change," Ricketts told DW of fires that have burnt well over 5 million acres across California, Oregon, Washington State, and into neighboring Idaho. </p><p>In a two-day period in early September, Ricketts notes that more of Washington State burned than in almost any entire fire season until now, apart from 2015. </p><p>California, meanwhile, was a tinderbox after its hottest summer on record, with temperatures in Death Valley reaching nearly 130 degrees Fahrenheit, according to the U.S. National Weather Service. It has been reported as the hottest temperature ever measured on Earth.</p>
<div id="29ad9" class="rm-shortcode" data-rm-shortcode-id="8346fe7350e1371d400097cd48bf45a2"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1306969603180879872" data-partner="rebelmouse"><div style="margin:1em 0">Drought-parched wetlands in South America have been burning for weeks. https://t.co/pjAKdFcKPg #Pantanal https://t.co/ImN2C5vwcp</div> — NASA Earth (@NASA Earth)<a href="https://twitter.com/NASAEarth/statuses/1306969603180879872">1600440810.0</a></blockquote></div><p>As evidenced by Australia's apocalyptic Black Summer of 2019-2020, fires are burning bigger and for longer, with new records set year-on-year. Right now, Brazil's vast and highly biodiverse Pantanal wetlands are suffering from catastrophic fires.</p>
#climatefires Started in Australia<p>Governor Inslee this month invoked the phrase climate fires for arguably the first time in the U.S., according to Ricketts.</p><p>But the term was also used as fires burnt out of control in Australia in late 2019. In the face of a 2000km (more than 1,200 miles) fire front, and government officials and media who <a href="https://www.dw.com/en/trump-climate-change-denial-emissions-environment-germany-fake-heartland-seibt/a-52688933" target="_blank">played down the link to climate change</a>, Greens Party Senator Sarah Hanson-Young and a friend decided that reference to bushfires was inadequate. </p><p>"We both just said, we've got to start calling them climate fires, that's what they are," the Australian Senator told DW.</p><p>Hanson-Young says scientists have been warning for decades that these would be the effects of global heating. "We've been told these kinds of extreme weather events and destruction is what climate change would look like, and it's right here on our doorstep," she said from her home state of South Australia — where by early September fire warnings had already been issued.</p><p>"Calling them climate fires was making it absolutely crystal clear. It is essential that there's no ambiguity," she said </p><p>Having deliberately invoked the term, Hanson-Young soon started to push it on social media via a #climatefires hashtag. </p>
How to Talk About the Urgency of Global Heating<p>The need to use more explicit language when talking about extreme weather events linked to climate change is part of a broader push to express the urgency of global heating. In 2019, activist Greta Thunberg tweeted that the term "climate change" did not reflect the seriousness of the situation. </p><p>"Can we all now please stop saying 'climate change' and instead call it what it is: climate breakdown, climate crisis, climate emergency, ecological breakdown, ecological crisis and ecological emergency?" she wrote. </p><p>"Climate change has for a long time been talked about as something that is a danger in the future," said Hansen-Young. "But the consequences are already here. When people hear the word crisis, they understand that something has to happen, that action has to be taken."</p><p><span></span>Some terms are now used in public policy, with state and national governments, and indeed the EU Parliament, declaring an official climate emergency in the last year. </p>
Words That Reflect the Science<p>But while the West Coast governors all fervently link the fires to an unfolding climate crisis, U.S. President Donald Trump continues to avoid any reference to climate. In a briefing about the fires, he responded to overtures by Wade Crowfoot, California's Natural Resources Secretary, to work with the states on the climate crisis by stating: "It'll start getting cooler. You just watch." Crowfoot replied by saying that scientists disagreed. Trump rejoined with "I don't think science knows, actually." </p><p>It was reminiscent of the anti-science approach to the coronavirus pandemic within the Trump administration, <a href="https://www.dw.com/en/donald-trump-admits-playing-down-coronavirus-risks/a-54874350" target="_blank" rel="noopener noreferrer">at least publicly</a>. Fossil fuel companies are also benefiting from his disavowal of climate science, with the Trump administration having <a href="https://www.dw.com/en/opinion-trumps-paris-climate-accord-exit-isnt-really-a-problem/a-51124958" target="_blank" rel="noopener noreferrer">pulled out of the Paris Agreement</a> and reopened fossil fuel infrastructure like the Keystone XL pipeline. </p><p>But the science community has responded, with Scientific American magazine endorsing Trump's Democratic presidential challenger Joe Biden, the first presidential endorsement in its 175-year history. </p><p>Hanson-Young says the use of explicit language like climate fires has also been important in Australia due to the climate denialism of politicians and the press, especially in publications owned by Rupert Murdoch. As fires burnt out much of Australia's southeast coast, they were commonly blamed on arson — a tactic also recently used in the U.S.</p>
Climate Rhetoric Could Help Decide Election<p>The language of climate has begun to influence the U.S. presidential election campaign, with Democratic nominee Joe Biden labelling President Trump a "climate arsonist."</p><p>Biden is touting a robust climate plan that includes a 2050 zero emissions target and a return to the Paris Agreement. Though lacking the ambition of The New Green Deal, it has been front and center of his policy platform in recent days, at a time when five hurricanes are battering the U.S. Gulf Coast while smoke blanketing the West Coast spreads all the way to the East. </p><p>People are experiencing the climate crisis in a visceral way and almost universally relate to the language of an emergency, says Ricketts. "They know something is wrong."</p>
- The Vicious Climate-Wildfire Cycle - EcoWatch ›
- How Climate Change Ignites Wildfires From California to South Africa ›
- 31 Dead, 250,000 Evacuated in California Fires as Governor ... ›
World's Richest One Percent Are Producing More Than Double the Carbon Emissions as the Bottom 50 Percent
A new report from Oxfam found that the wealthiest one percent of the world produced a carbon footprint that was more than double that of the bottom 50 percent of the world, The Guardian reported. The study examined 25 years of carbon dioxide emissions and wealth inequality from 1990 to 2015.