Health
UK Study Finds Common Chemicals May Harm Gut Bacteria and Human Health
Dozens of widely used chemicals could be toxic to gut bacteria, potentially affecting human health, according to a new study by UK scientists. Researchers tested more than 1,000 chemicals in the laboratory and identified 168 that appeared to prevent healthy gut bacteria from growing, raising concerns about their impact on the gut microbiome.
The gut microbiome consists of thousands of bacterial species and other microorganisms that live in the digestive tract. Scientists have linked it to numerous health outcomes, including cancer, heart disease, type 2 diabetes, insomnia, and complications during pregnancy such as preterm birth.
In the study, researchers tested 1,076 chemical contaminants—including pesticides, herbicides, industrial chemicals, and so-called “forever chemicals” like per- and polyfluoroalkyl substances (PFAS)—on 22 species of gut bacteria. Many of the harmful chemicals, including flame retardants and plasticisers used in everyday products, were not previously known to affect living organisms, the team said.
“We were surprised that some of these chemicals had such strong effects,” said Indra Roux, a researcher at the University of Cambridge and one of the study’s authors. “Many industrial chemicals that we are regularly in contact with weren’t thought to affect living organisms at all, but they do.”
The chemicals can enter the human body through food, water, and other environmental exposures. While the precise level of real-world exposure remains unclear, the researchers noted that environmental pollutants have been linked to changes in the gut microbiome that may contribute to obesity and insulin resistance.
Laboratory tests also revealed that some bacteria altered their functions to survive chemical exposure, which in some cases led to increased resistance to antibiotics. If similar effects occur in humans, this could make infections harder to treat and worsen the growing public health problem of antimicrobial resistance (AMR).
Traditionally, chemical safety assessments focus on the chemicals’ intended targets—such as how effectively a pesticide kills pests—without considering their potential impact on the human gut. “Safety assessments of new chemicals for human use must ensure they are also safe for our gut bacteria, which could be exposed to the chemicals through our food and water,” said Stephan Kamrad, another author from the University of Cambridge.
The study, published in Nature Microbiology, calls for more real-world data to determine whether laboratory findings translate to effects on human gut health. Meanwhile, researchers advise people to reduce exposure where possible, for example by washing fruits and vegetables thoroughly and avoiding the use of pesticides at home.
The findings add to growing evidence that everyday chemical exposures may have unintended consequences on human health, highlighting the need for more comprehensive safety testing that considers the gut microbiome.
Health
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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Health
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