Health
Bottled water found to contain tens of thousands of ‘tiny plastic particles’ in new study
People who drink bottled water may be getting more than just hydration, some researchers claim.
A new study published in the journal Proceedings of the National Academy of Sciences found that each bottle of water can contain hundreds of thousands of nanoplastics, which are tiny particles of plastic below 1 micrometer, measured in billionths of a meter.
Researchers from Columbia University Lamont-Doherty Earth Observatory, Columbia University, and Columbia Mailman School of Public Health in New York found that each liter of water contained around 240,000 of these plastic fragments, much higher than previously thought.
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Because nanoplastics are so tiny, the concern is that they could make their way into people’s bloodstreams and organs and potentially enter individual cells, the researchers cautioned in a press release from the university.
The potential health effects are still unknown.
A new study published in the journal Proceedings of the National Academy of Sciences found that each bottle of water can contain hundreds of thousands of nanoplastics. “Previously, this was just a dark area, uncharted,” said the study’s co-author. “Toxicity studies were just guessing.” (iStock)
While previous studies provided broad estimates of nanoplastic amounts, this is the first study to identify the specific number of individual particles, the researchers noted.
They used a novel technique called stimulated Raman scattering microscopy, in which lasers stimulate the molecules of common plastics.
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“We developed a powerful optical SRS imaging technique for rapid analysis of nanoplastics with unprecedented sensitivity and specificity,” study co-author Beizhan Yan, an environmental chemist at Columbia University’s Lamont-Doherty Earth Observatory, told Fox News Digital.
“Previously, this was just a dark area, uncharted. Toxicity studies were just guessing what’s in there,” he added in the press release. “This opens a window where we can look into a world that was not exposed to us before.”
Three popular types of bottled water were analyzed in the study, but the researchers did not specify the brands.
Three popular types of bottled water were analyzed in the study, although the researchers did not specify the brands. (iStock)
“We found approximately one quarter of a million tiny plastic particles in one liter of water, 90% of which are nanoplastics,” Yan said.
“This number is about 10 to 100 times higher than previously estimated.”
Out of the seven types of plastic identified, the most prevalent was polyamide, a type of nylon.
Another was polyethylene terephthalate (PET), which is the material used to make the water bottles themselves.
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Other detected plastics included polystyrene, polyvinyl chloride and polymethyl methacrylate.
In future studies, Yan said he hopes to use a laser with higher power to increase the sensitivity and plans to identify additional types of plastic beyond these initial seven.
“Media reports about these particles in drinking water do nothing more than unnecessarily scare consumers.”
Celeste Meiffren-Swango, the Zero Waste program director at Environment America in Colorado, who was not involved in the study, told Fox News Digital that she believes “we have a public crisis on our hands — in our bodies and our water.”
She went on, “This new nanoplastics study reinforces that plastics have infiltrated just about everywhere. The proof is indisputable: For the sake of human and wildlife health, it’s time for our society to move beyond plastics.”
Of the seven types of plastic identified, the most prevalent was polyamide, a type of nylon. Another was polyethylene terephthalate, which is the material used to make the water bottles themselves. (iStock)
The Northeast Bottled Water Association (NEBWA) was not a participant in the research, but also reacted to the study findings in a statement to Fox News Digital.
“This new study by Columbia University … used bottled water to apparently demonstrate a new method for nanoplastics analysis due to a lack of currently available methods,” said a statement from Jason Hutzley, executive director of NEBWA.
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“This new method needs to be fully reviewed by the scientific community and more research needs to be done to develop standardized methods for measuring and quantifying nanoplastics in our environment.”
NEBWA noted that there is “a lack of standardized methods and no scientific consensus on the potential health impacts of nanoplastic and microplastic particles. Therefore, media reports about these particles in drinking water do nothing more than unnecessarily scare consumers.”
The Northeast Bottled Water Association (NEBWA) said there is “a lack of standardized methods and no scientific consensus on the potential health impacts of nanoplastic and microplastic particles.” (iStock)
The association’s statement also pointed out that microplastics and nanoplastics are found in thousands of food and beverage products packaged in plastic containers, not just water bottles.
“Moreover, and perhaps even more important, nanoplastic and microplastic particles are found in all aspects of our environment — soil, air and water,” the statement added.
When contacted for comment, the U.S. Food and Drug Administration (FDA), which is not involved with the Columbia study, said it is aware of the studies that have been conducted on microplastics in the food supply.
“While there is evidence that microplastics and nanoplastics are entering the food supply … there is a lack of evidence demonstrating that microplastics or nanoplastics occurrence in food poses a risk to human health.”
“This is an area where the FDA has not only been monitoring the research but also working to advance the science through analysis of testing methodologies and other related work, including participation in the United States Government Nanoplastic Community of Interest,” an FDA spokesperson told Fox News Digital.
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“There have been fewer studies on nanoplastics because there are not as many reliable methods to measure them,” the agency continued.
“This and other significant research gaps exist, but the FDA is not aware of scientific evidence that would support consumers being concerned about the potential level of microplastic or nanoplastic contamination in food, including bottled water.”
“We do not advise against drinking bottled water when necessary, as the risk of dehydration may outweigh the potential impacts of nanoplastics exposure,” the study researcher said. (iStock)
“While there is evidence that microplastics and nanoplastics are entering the food supply, primarily from environmental contamination, there is a lack of evidence demonstrating that microplastics or nanoplastics occurrence in food poses a risk to human health.”
Bottled water processors must comply with “robust regulations,” the FDA noted.
Study author Yan acknowledged that further research is necessary to determine whether drinking bottled water containing nanoplastics could lead to adverse health effects.
“If people are concerned about nanoplastics in bottled water, it’s reasonable to consider alternatives like tap water and reusable bottles,” the researcher said.
“However, it’s important to emphasize that staying hydrated is crucial for health,” he added.
“Therefore, we do not advise against drinking bottled water when necessary, as the risk of dehydration may outweigh the potential impacts of nanoplastics exposure.”
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In a dramatic turn of events that’s captured the attention of animal lovers worldwide, Punch — the young macaque at a zoo in Japan famous for his inseparable bond with a stuffed orangutan toy — has reached a major milestone in his journey toward social integration.
On Thursday, visitors and staff at the Ichikawa Zoological and Botanical Garden witnessed a breakthrough: Punch was seen cuddling with and hitching a ride on the back of a fellow macaque.
Punch’s story began with hardship. He was abandoned by his mother shortly after his birth in July 2025 — and to ensure his survival, zookeepers stepped in to hand-rear the primate.
On Jan. 19, 2026, the zoo officially began the process of reintegrating Punch into the “monkey mountain” enclosure.
The transition was initially fraught with tension.
Punch’s story began with hardship when he was abandoned by his mother shortly after he was born. To help him, zookeepers gave him a stuffed toy that he began dragging around everywhere he went. (David Mareuil/Anadolu via Getty Images)
As a hand-reared infant, Punch was bullied and ignored by the established group of monkeys.
He was often seen huddled alone with his orange plush companion while the rest of the troop interacted.
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In an official statement released Feb. 27, the Ichikawa Zoological and Botanical Garden detailed the meticulous care behind this process.
Previous viral videos showed Punch bullied by the rest of the troop, running to his plushy toy for comfort. (David Mareuil/Anadolu via Getty Images)
“From an animal welfare perspective, our primary goal is to reintegrate Punch with the troop,” the zoo said.
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The strategy involved nursing Punch within the enclosure, so the troop could recognize him as one of their own, and pairing him with a gentle young female macaque prior to his full release to build his confidence.
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The latest footage, captured by X user @tate_gf, suggested the zoo’s patience is paying off.
The video shows Punch seeking physical contact not from his toy, but from another monkey — eventually climbing onto its back for a vital social behavior for young macaques: the “piggyback ride.”
The zoo’s strategy appears to be paying off: Punch, shown at far left, was recently seen riding on the back of a fellow macaque. (David Mareuil/Anadolu via Getty Images)
While Punch still carries his stuffed toy for comfort during moments of perceived danger, the zoo remains optimistic about his progress.
The organization cited the successful 2009 case of Otome, another hand-reared macaque who eventually outgrew her stuffed toy, successfully integrated — and went on to raise four offspring of her own.
The zoo has had crowds coming to see Punch, with hundreds of people lining up to get inside to see the young star, according to reports.
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“I’m hoping Punch has a good life like everybody else does, and think he’s a cute little guy,” one person commented online.
“Such a precious baby,” another person wrote.
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This story discusses suicide. If you or someone you know is having thoughts of suicide, please contact the Suicide & Crisis Lifeline at 988 or 1-800-273-TALK (8255).
Artificial intelligence has been touted as a boon to healthcare, but a new study has revealed its potential shortcomings when it comes to giving medical advice.
In January, OpenAI launched ChatGPT Health, the medical-focused version of the popular chatbot tool.
The company introduced the tool as “a dedicated experience that securely brings your health information and ChatGPT’s intelligence together, to help you feel more informed, prepared and confident navigating your health.”
But researchers at the Icahn School of Medicine at Mount Sinai have found that the tool failed to recommend emergency care for a “significant number” of serious medical cases.
The study, published in the journal Nature Medicine on Feb. 23, aimed to explore how ChatGPT Health — which is reported to have about 40 million users daily — handles situations where people are asking whether to seek emergency care.
Artificial intelligence has been touted as a boon to healthcare, but a new study has revealed its potential shortcomings when it comes to giving medical advice. (iStock)
“Right now, no independent body evaluates these products before they reach the public,” lead author Ashwin Ramaswamy, M.D., instructor of urology at the Icahn School of Medicine at Mount Sinai in New York City, told Fox News Digital.
“We wouldn’t accept that for a medication or a medical device, and we shouldn’t accept it for a product that tens of millions of people are using to make health decisions.”
Emergency scenarios
The team created 60 clinical scenarios across 21 medical specialties, ranging from minor conditions to true medical emergencies.
Three independent physicians then assigned an appropriate level of urgency for each case, based on published clinical practice guidelines in 56 medical societies.
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The researchers conducted 960 interactions with ChatGPT Health to see how the tool responded, taking into account gender, race, barriers to care and “social dynamics.”
While “clear-cut emergencies” — such as stroke or severe allergy — were generally handled well, the researchers found that the tool “under-triaged” many urgent medical issues.
The team created 60 clinical scenarios across 21 medical specialties, ranging from minor conditions to true medical emergencies. (iStock)
For example, in one asthma scenario, the system acknowledged that the patient was showing early signs of respiratory failure — but still recommended waiting instead of seeking emergency care.
“ChatGPT Health performs well in medium-severity cases, but fails at both ends of the spectrum — the cases where getting it right matters most,” Ramaswamy told Fox News Digital. “It under-triaged over half of genuine emergencies and over-triaged roughly two-thirds of mild cases that clinical guidelines say should be managed at home.”
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Under-triage can be life-threatening, the doctor noted, while over-triage can overwhelm emergency departments and delay care for those in real need.
Researchers also identified inconsistencies in suicide risk alerts. In some cases, it directed users to the 988 Suicide and Crisis Lifeline in lower-risk scenarios, and in others, it failed to offer that recommendation even when a person discussed suicidal ideations.
“ChatGPT Health performs well in medium-severity cases, but fails at both ends of the spectrum.”
“The suicide guardrail failure was the most alarming,” study co-author Girish N. Nadkarni, M.D., chief AI officer of the Mount Sinai Health System, told Fox News Digital.
ChatGPT Health is designed to show a crisis intervention banner when someone describes thoughts of self-harm, the researcher noted.
OpenAI launched ChatGPT Health, the medical-focused version of the popular chatbot tool, in January 2026. (Gabby Jones/Bloomberg via Getty Images)
“We tested it with a 27-year-old patient who said he’d been thinking about taking a lot of pills,” Nadkarni said. “When he described his symptoms alone, the banner appeared 100% of the time. Then we added normal lab results — same patient, same words, same severity — and the banner vanished.”
“A safety feature that works perfectly in one context and completely fails in a nearly identical context … is a fundamental safety problem.”
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The researchers were also surprised by the social influence aspect.
“When a family member in the scenario said ‘it’s nothing serious’ — which happens all the time in real life — the system became nearly 12 times more likely to downplay the patient’s symptoms,” Nadkarni said. “Everyone has a spouse or parent who tells them they’re overreacting. The AI shouldn’t be agreeing with them during a potential emergency.”
Fox News Digital reached out to Open AI, creator of ChatGPT, requesting comment.
Physicians react
Dr. Marc Siegel, Fox News senior medical analyst, called the new study “important.”
“It underlines the principle that while large language models can triage clear-cut emergencies, they have much more trouble with nuanced situations,” Siegel, who was not involved in the study, told Fox News Digital.
ChatGPT and other LLMs can be helpful tools, a doctor said, but they “should not be used to give medical direction.” (iStock)
“This is where doctors and clinical judgment come in — knowing the nuances of a patient’s history and how they report symptoms and their approach to health.”
ChatGPT and other LLMs can be helpful tools, Siegel said, but they “should not be used to give medical direction.”
“Machine learning and continued input of data can help, but will never compensate for the essential problem – human judgment is needed to decide whether something is a true emergency or not.”
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Dr. Harvey Castro, an emergency physician and AI expert in Texas, echoed the importance of the study, calling it “exactly the kind of independent safety evaluation we need.”
“Innovation moves fast. Oversight has to move just as fast,” Castro, who also did not work on the study, told Fox News Digital. “In healthcare, the most dangerous mistakes happen at the extremes, when something looks mild but is actually catastrophic. That’s where clinical judgment matters most, and where AI must be stress-tested.”
Study limitations
The researchers acknowledged some potential limitations in the study design.
“We used physician-written clinical scenarios rather than real patient conversations, and we tested at a single point in time — these systems update frequently, so performance may change,” Ramaswamy told Fox News Digital.
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Additionally, most of the missed emergencies happened in situations where the danger depended on how the condition was changing over time. It’s not clear whether the same problem would happen with acute medical emergencies.
Because the system had to choose just one fixed urgency category, the test may not reflect the more nuanced advice it might give in a back-and-forth conversation, the researchers noted.
ChatGPT Health is designed to show a crisis intervention banner when someone describes thoughts of self-harm. (iStock)
Also, the study wasn’t large enough to confidently detect small differences in how recommendations might vary by race or gender.
“We need continuous auditing, not one-time studies,” Castro noted. “These systems update frequently, so evaluation must be ongoing.”
‘Don’t wait’
The researchers emphasized the importance of seeking immediate care for serious issues.
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“If something feels seriously wrong — chest pain, difficulty breathing, a severe allergic reaction, thoughts of self-harm — go to the emergency department or call 988,” Ramaswamy advised. “Don’t wait for an AI to tell you it’s OK.”
The researchers noted that they support the use of AI to improve healthcare access, and that they didn’t conduct the study to “tear down the technology.”
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“These tools can be genuinely useful for the right things — understanding a diagnosis you’ve already received, looking up what your medications do and their side effects, or getting answers to questions that didn’t get fully addressed in a short doctor’s visit,” Ramaswamy said.
“That’s a very different use case from deciding whether you need emergency care. Treat them as a complement to your doctor, not a replacement.”
“This study doesn’t mean we abandon AI in healthcare.”
Castro agreed that the benefits of AI health tools should be weighed against the risks.
“AI health tools can increase access, reduce unnecessary visits and empower patients with information,” he said. “They are not inherently unsafe, but they are not yet substitutes for clinical judgment.”
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“This study doesn’t mean we abandon AI in healthcare,” he went on. “It means we mature it. Independent testing and stronger guardrails will determine whether AI becomes a safety net or a liability.”
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