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Guilt-Tripping for the Public Good Often Achieves Its Intended Result

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Tuesday, April 16, 2024

In 2016 Merck launched an advertising campaign for its HPV vaccine that aroused a storm of protest and headlines. The Washington Post published an article entitled “Do the new Merck HPV ads guilt-trip parents or tell hard truths? Both.” One of Merck’s TV ads showed an adult woman diagnosed with cervical cancer and flashed back to her as a child, asking, “Did you know [there was a vaccine for HPV]—Mom, Dad?”“I thought, ‘This is the thing that's going to make parents say I would feel horrible if my kid got cervical cancer later, and I could have vaccinated them,’” says Monique Turner, a communication scientist at Michigan State University (MSU). ”So, from a research perspective, I was like, ‘Thumbs-up, Merck.’ But they took a lot of heat for it.”Guilt is a powerful tool. Research has shown that, wielded effectively, it can persuade people to do the right thing. In a recent analysis of 26 studies of guilt appeals, Washington State University communication scientist Wei Peng found that guilt works—if people hearing the pitch are not made to feel responsible for a bad situation. Picture asking them to help with an environmental catastrophe.On supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.The most straightforward pitches involve what researchers call “existential guilt,” Peng says. They rely on our internal moral code that, as a human being, we have an obligation to relieve the suffering of others if we can. “What I found is that people feel guilty about people’s suffering even if they don’t have a direct personal relationship,” Peng says, “even if they are on the other side of the world.”It’s hard for most people to see photographs of starving children. Doing so hurts. Taking action to help them offers some relief. That’s what advocates are counting on when they ask you for donations to feed orphans or build shelters for earthquake survivors. Knowing guilt’s potential for good, social scientists are seeking the optimal formula to craft pitches for everything from promoting health behaviors and road safety to safeguarding the planet.But getting the formula right is tricky. “We have a hardwired negativity bias to instantly pay attention to anything that arouses a negative emotion,” says Pennsylvania State University media psychologist Jessica Myrick. That’s why inflicting guilt often works. But the downside of arousing this intensely uncomfortable feeling is that people can employ a battery of defenses against it: getting angry, rationalizing or distancing from the issue.That is the important takeaway from Peng’s research: guilt works when it doesn’t trigger resistance. In other words, don’t make listeners feel they’ve done something bad. “If you say we need to do something different versus you,” says persuasion scholar Robin Nabi of the University of California, Santa Barbara, “now you’re not the bad guy. We all have responsibility.”There are many ways to get this wrong. For example, if messengers arouse shame rather than guilt, MSU’s Turner found, people resist more. In her research, participants were asked to read an ad urging testing for sexually transmitted diseases (STDs) that evoked either guilt or shame and then to give their reactions. A headline in the guilt and shame appeals respectively asked what or who would give one’s partner an STD,” followed by multiple-choice answers. In both, the correct answer—“all of the above”—was circled at the bottom. The second-to-last option seen by both groups was objective: it referred to a person who hadn’t been tested for an STD The other multiple-choice answers were designed to evoke either guilt or shame. Those in the guilt appeal group were presented with choices such as, “someone with uninformed behavior”and “someone with forgetful behavior.” The group reading the shame appeal saw choices such as, “a selfish person” and “an irresponsible person.” Subjects in the latter group were likelier to feel angry and manipulated.As Turner explains, pointing out problematic behavior induces guilt, but focusing on someone’s inherent character traits—selfishness, for example—can induce shame. In most contexts, making people feel ashamed is not a good persuader.The key to making a guilt pitch succeed is to offer people relief from the guilt they’re feeling. In humanitarian appeals, people are usually offered easy-to-accomplish solutions: save the puppies from being euthanized by donating or volunteering, for instance. For health or safety messages, taking action may be harder, making messaging more challenging.If you’re asking parents to shield their kids from asthma risk from secondhand smoke, for example, saying, “Just quit” may be too hard for them. It is more effective, Nabi says, if you give people options: “Just smoke outside or not around your kids” or “Cut down how much you smoke.” “The idea is that when you evoke this emotion and then you give people a sense of efficacy,” she says, “it’s actually hope evoking.”That’s what scientists are finding in the lab. Adding a feel-good emotion to a guilt appeal—hope or pride, for example—works better. For one thing, it reduces people’s defensiveness, and that’s the first step: make sure they don’t shut you out. One recent study tested the effect of building hope into guilt appeals in a campaign to reduce texting while driving, which is an urgent safety issue because laws and enforcement have done little to reduce crashes tied to texting.In the online experiment, about 400 people were randomly placed in four groups. The first two groups viewed identical posters except that one added a hopeful message. The headline in both read, “You are never alone on the road.”The posters acknowledged how tempting it was to answer a text but noted that texting while driving was a factor in 20 percent of crashes. The “hope” message added recommendations to “turn on drive mode or silence your phone” and noted that doing so “can save lives.” In two other groups, people read what were essentially the same guilt-invoking or hopeful messages except that the language was more intense. The top headline, for example, read, “What you don’t see is a long and lovely life.” Adding the hopeful message reduced targets’ defensive responses in both language intensity groups. It also increased their stated intentions to avoid texting while driving.One new preprint study on guilt messaging tested the effect of inducing empathy alongside guilt in a hypothetical public-service campaign to reduce plastic bag pollution in oceans. In this online experiment, 257 college students were randomly assigned to read one of four messages from a fictional Facebook page, “Save the Marine Animals Foundation,” asking them to reduce their plastic bag use. In half the groups the undergraduates were asked to take the perspective of an animal suffering from ingesting a plastic bag. Researchers found that adopting the animals’ viewpoint created empathy. More empathy was associated with more guilt, which was, in turn, correlated with an increase in participants’ intentions to cut down on plastic bag use.In some appeals to protect the environment, inducing pride along with guilt proves to be the winning recipe for persuading people to change their behavior. In a meta-analysis of 30 years of research, data scientist Nathan Shipley, then at the University of Illinois at Urbana-Champaign, zeroed in on campaigns that induce people to imagine they’ll feel guilty or proud of themselves depending on their future behavior. He found that both emotions correlated with subjects’ intended and reported pro-environmental behavior, but the pride relationship was stronger.The success of these efforts depends at least partly on how well a message is tailored to a specific audience. Undergraduates in these studies, for example, are typically more environmentally conscious than their parents. The results in a new study showed that for Generation Z restaurant diners, both anticipated guilt for eating less environmentally sustainable food and an anticipated pride for eating more environmentally friendly, plant-based foods influenced their intentions to eat at chain restaurants that offered nonmeat options.Another study tested whether mothers of young children were more susceptible than others to guilt appeals to switch to buying organic food. The researchers found that they were. That’s not surprising, says Myrick, who is a mother of three kids under the age of five. Myrick is bombarded with guilt appeals. She’s had to triage the things she feels guilty about, such as using disposable diapers and paper plates, because, she says, “I’d feel even more guilty if I didn’t feed my kids something even when I don’t have time to prepare food.”Another study measured neither pride nor guilt, but both may have been implicitly invoked, says Elizabeth Hewitt, a social scientist at Stony Brook University and lead author of the paper. Over 12 weeks in two next-door apartment buildings in New York City, experimenters posted signs in the trash rooms every week announcing how well each building had done in recycling efforts. The sign in one building compared the amount of much of plastic, metal and glass its residents had recycled during the previous week with how much they had recycled the week before. The sign in the other building compared the amount its residents recycled in the previous week with how much their neighbors recycled during the same period. Both buildings increased their recycling by bag weight, but the feedback that compared residents with their neighbors resulted in more recycled material. Although the mechanism operated through peer pressure, guilt can play a role if a person feels they are not doing as much as they should, Hewitt says. Surpassing your neighbors can trigger pride.This swell of research is both timely and necessary, scientists say. Left to our own devices, we are not always our best selves—or our own best friends. Persuasive public service messaging will need to be crafted for new generations. Take the campaigns for the HPV vaccine. Over 20 years, they were a factor in reducing HPV infections in teenage girls by 88 percent and in young adult women by 81 percent. Yet vaccination rates in the U.S. remain lower than in other countries, and rates are uneven across the U.S., leaving many vulnerable to preventable cancers. To address such problems, it remains urgent to find effective tools of persuasion. Guilt, massaged in the right ways, can be a powerful tool.

The emerging science of laying guilt through public messaging can help safeguard the planet and improve health behaviors

In 2016 Merck launched an advertising campaign for its HPV vaccine that aroused a storm of protest and headlines. The Washington Post published an article entitled “Do the new Merck HPV ads guilt-trip parents or tell hard truths? Both.” One of Merck’s TV ads showed an adult woman diagnosed with cervical cancer and flashed back to her as a child, asking, “Did you know [there was a vaccine for HPV]—Mom, Dad?”

“I thought, ‘This is the thing that's going to make parents say I would feel horrible if my kid got cervical cancer later, and I could have vaccinated them,’” says Monique Turner, a communication scientist at Michigan State University (MSU). ”So, from a research perspective, I was like, ‘Thumbs-up, Merck.’ But they took a lot of heat for it.”

Guilt is a powerful tool. Research has shown that, wielded effectively, it can persuade people to do the right thing. In a recent analysis of 26 studies of guilt appeals, Washington State University communication scientist Wei Peng found that guilt works—if people hearing the pitch are not made to feel responsible for a bad situation. Picture asking them to help with an environmental catastrophe.


On supporting science journalism

If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.


The most straightforward pitches involve what researchers call “existential guilt,” Peng says. They rely on our internal moral code that, as a human being, we have an obligation to relieve the suffering of others if we can. “What I found is that people feel guilty about people’s suffering even if they don’t have a direct personal relationship,” Peng says, “even if they are on the other side of the world.”

It’s hard for most people to see photographs of starving children. Doing so hurts. Taking action to help them offers some relief. That’s what advocates are counting on when they ask you for donations to feed orphans or build shelters for earthquake survivors. Knowing guilt’s potential for good, social scientists are seeking the optimal formula to craft pitches for everything from promoting health behaviors and road safety to safeguarding the planet.

But getting the formula right is tricky. “We have a hardwired negativity bias to instantly pay attention to anything that arouses a negative emotion,” says Pennsylvania State University media psychologist Jessica Myrick. That’s why inflicting guilt often works. But the downside of arousing this intensely uncomfortable feeling is that people can employ a battery of defenses against it: getting angry, rationalizing or distancing from the issue.

That is the important takeaway from Peng’s research: guilt works when it doesn’t trigger resistance. In other words, don’t make listeners feel they’ve done something bad. “If you say we need to do something different versus you,” says persuasion scholar Robin Nabi of the University of California, Santa Barbara, “now you’re not the bad guy. We all have responsibility.”

There are many ways to get this wrong. For example, if messengers arouse shame rather than guilt, MSU’s Turner found, people resist more. In her research, participants were asked to read an ad urging testing for sexually transmitted diseases (STDs) that evoked either guilt or shame and then to give their reactions. A headline in the guilt and shame appeals respectively asked what or who would give one’s partner an STD,” followed by multiple-choice answers. In both, the correct answer—“all of the above”—was circled at the bottom. The second-to-last option seen by both groups was objective: it referred to a person who hadn’t been tested for an STD The other multiple-choice answers were designed to evoke either guilt or shame. Those in the guilt appeal group were presented with choices such as, “someone with uninformed behavior”and “someone with forgetful behavior.” The group reading the shame appeal saw choices such as, “a selfish person” and “an irresponsible person.” Subjects in the latter group were likelier to feel angry and manipulated.

As Turner explains, pointing out problematic behavior induces guilt, but focusing on someone’s inherent character traits—selfishness, for example—can induce shame. In most contexts, making people feel ashamed is not a good persuader.

The key to making a guilt pitch succeed is to offer people relief from the guilt they’re feeling. In humanitarian appeals, people are usually offered easy-to-accomplish solutions: save the puppies from being euthanized by donating or volunteering, for instance. For health or safety messages, taking action may be harder, making messaging more challenging.

If you’re asking parents to shield their kids from asthma risk from secondhand smoke, for example, saying, “Just quit” may be too hard for them. It is more effective, Nabi says, if you give people options: “Just smoke outside or not around your kids” or “Cut down how much you smoke.” “The idea is that when you evoke this emotion and then you give people a sense of efficacy,” she says, “it’s actually hope evoking.”

That’s what scientists are finding in the lab. Adding a feel-good emotion to a guilt appeal—hope or pride, for example—works better. For one thing, it reduces people’s defensiveness, and that’s the first step: make sure they don’t shut you out. One recent study tested the effect of building hope into guilt appeals in a campaign to reduce texting while driving, which is an urgent safety issue because laws and enforcement have done little to reduce crashes tied to texting.

In the online experiment, about 400 people were randomly placed in four groups. The first two groups viewed identical posters except that one added a hopeful message. The headline in both read, “You are never alone on the road.”The posters acknowledged how tempting it was to answer a text but noted that texting while driving was a factor in 20 percent of crashes. The “hope” message added recommendations to “turn on drive mode or silence your phone” and noted that doing so “can save lives.” In two other groups, people read what were essentially the same guilt-invoking or hopeful messages except that the language was more intense. The top headline, for example, read, “What you don’t see is a long and lovely life.” Adding the hopeful message reduced targets’ defensive responses in both language intensity groups. It also increased their stated intentions to avoid texting while driving.

One new preprint study on guilt messaging tested the effect of inducing empathy alongside guilt in a hypothetical public-service campaign to reduce plastic bag pollution in oceans. In this online experiment, 257 college students were randomly assigned to read one of four messages from a fictional Facebook page, “Save the Marine Animals Foundation,” asking them to reduce their plastic bag use. In half the groups the undergraduates were asked to take the perspective of an animal suffering from ingesting a plastic bag. Researchers found that adopting the animals’ viewpoint created empathy. More empathy was associated with more guilt, which was, in turn, correlated with an increase in participants’ intentions to cut down on plastic bag use.

In some appeals to protect the environment, inducing pride along with guilt proves to be the winning recipe for persuading people to change their behavior. In a meta-analysis of 30 years of research, data scientist Nathan Shipley, then at the University of Illinois at Urbana-Champaign, zeroed in on campaigns that induce people to imagine they’ll feel guilty or proud of themselves depending on their future behavior. He found that both emotions correlated with subjects’ intended and reported pro-environmental behavior, but the pride relationship was stronger.

The success of these efforts depends at least partly on how well a message is tailored to a specific audience. Undergraduates in these studies, for example, are typically more environmentally conscious than their parents. The results in a new study showed that for Generation Z restaurant diners, both anticipated guilt for eating less environmentally sustainable food and an anticipated pride for eating more environmentally friendly, plant-based foods influenced their intentions to eat at chain restaurants that offered nonmeat options.

Another study tested whether mothers of young children were more susceptible than others to guilt appeals to switch to buying organic food. The researchers found that they were. That’s not surprising, says Myrick, who is a mother of three kids under the age of five. Myrick is bombarded with guilt appeals. She’s had to triage the things she feels guilty about, such as using disposable diapers and paper plates, because, she says, “I’d feel even more guilty if I didn’t feed my kids something even when I don’t have time to prepare food.”

Another study measured neither pride nor guilt, but both may have been implicitly invoked, says Elizabeth Hewitt, a social scientist at Stony Brook University and lead author of the paper. Over 12 weeks in two next-door apartment buildings in New York City, experimenters posted signs in the trash rooms every week announcing how well each building had done in recycling efforts. The sign in one building compared the amount of much of plastic, metal and glass its residents had recycled during the previous week with how much they had recycled the week before. The sign in the other building compared the amount its residents recycled in the previous week with how much their neighbors recycled during the same period. Both buildings increased their recycling by bag weight, but the feedback that compared residents with their neighbors resulted in more recycled material. Although the mechanism operated through peer pressure, guilt can play a role if a person feels they are not doing as much as they should, Hewitt says. Surpassing your neighbors can trigger pride.

This swell of research is both timely and necessary, scientists say. Left to our own devices, we are not always our best selves—or our own best friends. Persuasive public service messaging will need to be crafted for new generations. Take the campaigns for the HPV vaccine. Over 20 years, they were a factor in reducing HPV infections in teenage girls by 88 percent and in young adult women by 81 percent. Yet vaccination rates in the U.S. remain lower than in other countries, and rates are uneven across the U.S., leaving many vulnerable to preventable cancers. To address such problems, it remains urgent to find effective tools of persuasion. Guilt, massaged in the right ways, can be a powerful tool.

Read the full story here.
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The Pregnancy Pill Millions Trust Faces Alarming New Questions About Child Brain Health

Scientists are warning that one of the most trusted painkillers used in pregnancy may not be as safe as once believed. A sweeping review of studies finds links between prenatal acetaminophen exposure and higher risks of autism and ADHD in children. The medication crosses the placenta and may interfere with brain development, raising urgent questions [...]

New research raises red flags about acetaminophen use in pregnancy, linking it to autism and ADHD risks in children. ShutterstockScientists are warning that one of the most trusted painkillers used in pregnancy may not be as safe as once believed. A sweeping review of studies finds links between prenatal acetaminophen exposure and higher risks of autism and ADHD in children. The medication crosses the placenta and may interfere with brain development, raising urgent questions about clinical guidelines. Acetaminophen in Pregnancy Linked to Neurodevelopmental Risks Scientists at the Icahn School of Medicine at Mount Sinai report that children exposed to acetaminophen before birth may face a greater chance of developing neurodevelopmental conditions such as autism spectrum disorder and attention-deficit/hyperactivity disorder (ADHD). Their findings, published in BMC Environmental Health, mark the first time that the Navigation Guide methodology has been applied to thoroughly assess the quality and reliability of the research on this subject. Acetaminophen (commonly sold as Tylenol® in the United States and Canada, and known as paracetamol elsewhere) is the most widely used non-prescription treatment for pain and fever during pregnancy, taken by more than half of expectant mothers worldwide. For decades, it has been viewed as the safest option for relief from headaches, fever, and general pain. However, the Mount Sinai team’s review of 46 studies, which together involved over 100,000 participants from multiple countries, challenges this long-standing belief and highlights the importance of caution and additional investigation. Gold-Standard Review Methodology Applied The research team relied on the Navigation Guide Systematic Review, a leading framework used in environmental health. This method enables scientists to systematically evaluate each study, rating potential sources of bias such as incomplete data or selective reporting, while also weighing the overall strength and consistency of the evidence. “Our findings show that higher-quality studies are more likely to show a link between prenatal acetaminophen exposure and increased risks of autism and ADHD,” said Diddier Prada, MD, PhD, Assistant Professor of Population Health Science and Policy, and Environmental Medicine and Climate Science, at the Icahn School of Medicine at Mount Sinai. “Given the widespread use of this medication, even a small increase in risk could have major public health implications.” Possible Biological Mechanisms Behind the Link The paper also explores biological mechanisms that could explain the association between acetaminophen use and these disorders. Acetaminophen is known to cross the placental barrier and may trigger oxidative stress, disrupt hormones, and cause epigenetic changes that interfere with fetal brain development. While the study does not show that acetaminophen directly causes neurodevelopmental disorders, the research team’s findings strengthen the evidence for a connection and raise concerns about current clinical practices. Call for Updated Guidelines and Safer Alternatives The researchers call for cautious, time-limited use of acetaminophen during pregnancy under medical supervision; updated clinical guidelines to better balance the benefits and risks; and further research to confirm these findings and identify safer alternatives for managing pain and fever in expectant mothers. “Pregnant women should not stop taking medication without consulting their doctors,” Dr. Prada emphasized. “Untreated pain or fever can also harm the baby. Our study highlights the importance of discussing the safest approach with health care providers and considering non-drug options whenever possible.” Rising Autism and ADHD Rates Add Urgency With diagnoses of autism and ADHD increasing worldwide, these findings have significant implications for public health policy, clinical guidelines, and patient education. The study also highlights the urgent need for pharmaceutical innovation to provide safer alternatives for pregnant women. Reference: “Evaluation of the evidence on acetaminophen use and neurodevelopmental disorders using the Navigation Guide methodology” by Diddier Prada, Beate Ritz, Ann Z. Bauer and Andrea A. Baccarelli, 14 August 2025, Environmental Health.DOI: 10.1186/s12940-025-01208-0 The study was conducted in collaboration with the University of California, Los Angeles; University of Massachusetts Lowell; and Harvard T.H. Chan School of Public Health. Funding for this study was provided by the National Cancer Institute (U54CA267776), the National Institute of Environmental Health Sciences (R35ES031688), and the National Institute on Aging (U01AG088684). Important: These findings indicate a correlation, not definitive proof of causation. The medical community remains divided, and further research is needed. Always seek guidance from your healthcare professional before altering or discontinuing any treatment. Never miss a breakthrough: Join the SciTechDaily newsletter.Follow us on Google, Discover, and News.

Farm Workers At Risk For Kidney Disease

By Dennis Thompson HealthDay ReporterTHURSDAY, Oct. 2, 2025 (HealthDay News) — Farm workers have a higher risk for kidney disease, mainly due to...

By Dennis Thompson HealthDay ReporterTHURSDAY, Oct. 2, 2025 (HealthDay News) — Farm workers have a higher risk for kidney disease, mainly due to exposure to high heat and agricultural chemicals, a new small-scale study says.Workers on a grape farm near the Arizona-Sonora border had high levels of arsenic, cadmium and chromium in their urine, and those were linked to increased signs of kidney injury, according to findings published in the November issue of the journal Environmental Research.“We’re seeing an increase in kidney disease in young people who lack typical risk factors, especially in hotter regions,” said lead researcher Rietta Wagoner, a postdoctoral scholar at the University of Arizona.“There is evidence that heat, pesticides and metal exposures each play a role, and especially that heat is making potentially toxic exposures worse,” she said in a news release. “Each individually has been studied, but little research has examined a combination of factors. This study is an attempt to answer questions." For the study, researchers followed 77 farm workers who traveled seasonally from southern Mexico to work the grape farm. The workers arrived in February and March, at the beginning of the grape season, and stayed until the end of summer.The team collected daily urine and blood samples from the workers, and measured their heat stress twice a day with inner ear temperatures and heart rates.The worker’s kidney function generally decreased during the season, based on estimates derived from blood and urine samples.This decline was linked to chemicals found in pesticides and fertilizers, as well as the excessive summer heat in the Sonoran Desert, where air temperatures ranged upwards of 100 degrees Fahrenheit, researchers said.“When we looked at heat in combination with metals and metalloids, we found heat especially exacerbated the effects of the metals arsenic and cadmium on the kidney,” Wagoner said. “In other words, together, the effects were worse.”This kidney damage can be prevented, she said.“We recommend mandatory periodic breaks and rest built into the workday,” Wagoner said. “Provide water, electrolyte replacement and have restrooms nearby. Also, allow the workers time to get used to the conditions.”It’s also important to get to the source of workers’ exposure to these toxic metals, she said, noting that workers drink well water in places where uranium and arsenic are found in the soil.“If we can implement prevention measures early on,” Wagoner said, “we can prevent longer term issues.”SOURCES: University of Arizona, news release, Sept. 23, 2025; Environmental Research, November 2025What This Means For YouFarm workers should make sure to take frequent rest breaks during hot days and stay hydrated.Copyright © 2025 HealthDay. All rights reserved.

Giant Sinkhole in Chilean Mining Town Haunts Residents, Three Years On

TIERRA AMARILLA (Reuters) -Residents in the mining town of Tierra Amarilla in the Chilean desert are hopeful that a new court ruling will allay...

TIERRA AMARILLA (Reuters) -Residents in the mining town of Tierra Amarilla in the Chilean desert are hopeful that a new court ruling will allay their fears about a giant sinkhole that opened near their homes more than three years ago and remains unfilled.A Chilean environmental court this month ordered Minera Ojos del Salado, owned by Canada's Lundin Mining, to repair environmental damage related to activity at its Alcaparrosa copper mine, which is thought to have triggered the sinkhole that appeared in 2022.The ruling calls on the company to protect the region's water supply and refill the sinkhole. The cylindrical crater originally measured 64 meters (210 ft) deep and 32 meters (105 ft) wide at the surface.That has provided a small measure of relief to those in arid Tierra Amarilla in Chile's central Atacama region, who fear that without remediation the gaping hole could swallow up more land."Ever since the sinkhole occurred ... we've lived in fear," said Rudy Alfaro, whose home is 800 meters from the site. A health center and preschool are nearby too, she said."We were afraid it would get bigger, that it would expand, move toward the houses." The sinkhole expelled clouds of dust in a recent earthquake, provoking more anxiety, she said.     The court upheld a shutdown of the small Alcaparrosa mine ordered by Chile's environmental regulator in January, and confirmed "irreversible" damage to an aquifer, which drained water into the mine and weakened the surrounding rock."This is detrimental to an area that is already hydrologically stressed," said Rodrigo Saez, regional water director. Lundin said it will work with authorities to implement remediation measures.(Writing by Daina Beth Solomon, Editing by Rosalba O'Brien)Copyright 2025 Thomson Reuters.

Scientists Warn: Bottled Water May Pose Serious Long-Term Health Risks

Using it regularly introduces tens of thousands of microplastic and nanoplastic particles into the body each year. The tropical beauty of Thailand’s Phi Phi islands is not the kind of place where most PhD journeys begin. For Sarah Sajedi, however, it was not the beaches themselves but what lay beneath them that sparked her decision [...]

A scientist’s island epiphany uncovers how single-use bottles shed micro- and nanoplastics that infiltrate the body, with emerging evidence of chronic harm and measurement blind spots. Credit: ShutterstockUsing it regularly introduces tens of thousands of microplastic and nanoplastic particles into the body each year. The tropical beauty of Thailand’s Phi Phi islands is not the kind of place where most PhD journeys begin. For Sarah Sajedi, however, it was not the beaches themselves but what lay beneath them that sparked her decision to leave a career in business and pursue academic research. “I was standing there looking out at this gorgeous view of the Andaman Sea, and then I looked down and beneath my feet were all these pieces of plastic, most of them water bottles,” she says. “I’ve always had a passion for waste reduction, but I realized that this was a problem with consumption.” Sajedi, BSc ’91, decided to return to Concordia to pursue a PhD with a focus on plastic waste. As the co-founder of ERA Environmental Management Solutions, a leading provider of environmental, health, and safety software, she brought decades of experience to compliment her studies. Her latest paper, published in the Journal of Hazardous Materials, looks at the science around the health risks posed by single-use plastic water bottles. They are serious, she says, and seriously understudied. Sarah Sajedi with Chunjiang An: “Drinking water from plastic bottles is fine in an emergency but it is not something that should be used in daily life.” Tiny threats, little known In her analysis of more than 140 scientific papers, Sajedi reports that people ingest an estimated 39,000 to 52,000 microplastic particles each year. For those who rely on bottled water, that number climbs even higher—about 90,000 additional particles compared to individuals who primarily drink tap water. These particles are invisible to the eye. Microplastics range in size from one micron (a thousandth of a millimeter) to five millimeters, while nanoplastics are smaller than a single micron. They are released as plastic bottles are manufactured, stored, transported, and gradually degrade. Because many bottles are made from low-grade plastic, they shed particles whenever they are handled or exposed to sunlight and changes in temperature. Unlike plastics that move through the food chain before entering the human body, these are consumed directly from the container itself. Sarah Sajedi and Chunjiang An. Credit: Concordia UniversityAccording to Sajedi, the health risks are significant. Once inside the body, these small plastics can pass through biological barriers, enter the bloodstream, and reach major organs. Their presence may contribute to chronic inflammation, cellular oxidative stress, hormone disruption, reproductive issues, neurological damage, and some cancers. Still, their long-term impacts are not fully understood, largely because of limited testing and the absence of standardized ways to measure and track them. Sajedi also outlines the range of methods available to detect nano- and microplastics, each with benefits and limitations. Some approaches can locate particles at extremely small scales but cannot reveal their chemical makeup. Others identify the material composition but overlook the tiniest plastics. The most sophisticated and dependable tools are often prohibitively expensive and not widely accessible. Education is the best prevention Sajedi is encouraged by the legislative action that has been adopted by governments around the world aimed at limiting plastic waste. However, she notes that the most common targets are single-use plastic bags, straws, and packaging. Very few address the pressing issue of single-use water bottles. “Education is the most important action we can take,” she says. “Drinking water from plastic bottles is fine in an emergency but it is not something that should be used in daily life. People need to understand that the issue is not acute toxicity—it is chronic toxicity.” Reference: “Unveiling the hidden chronic health risks of nano- and microplastics in single-use plastic water bottles: A review” by Sarah Sajedi, Chunjiang An and Zhi Chen, 14 June 2025, Journal of Hazardous Materials.DOI: 10.1016/j.jhazmat.2025.138948 Funding: Natural Sciences and Engineering Research Council of Canada Never miss a breakthrough: Join the SciTechDaily newsletter.Follow us on Google, Discover, and News.

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