Health
Tea Leaves Can Steep Away Lead, Study Finds
Tea leaves pull heavy metals from water, significantly lowering the amount of lead and other dangerous compounds that people may be unknowingly drinking, a new study found.
Recent research has highlighted potential applications for used tea leaves, from biofuels to gluten-free cookies. But the new study shows a public health benefit from something that countless people are already doing. About five billion cups of tea are consumed each day around the world, according to one estimate.
“You can see the implications,” said Vinayak Dravid, a materials scientist at Northwestern and an author of the study, which was published this week. “How often do we touch billions of people?”
In many countries, the water used to steep tea is contaminated with lead from aging pipes. In the United States, nine million homes get their water through pipes that contain lead, according to the Environmental Protection Agency. Lead is especially dangerous to children. Exposure can lead to developmental delays and behavioral issues.
Dr. Dravid and his team tested how different types of tea — black, white, oolong, green, rooibos, herbal, loose leaf and plain old Lipton — behaved in water with varying amounts of lead.
The tea was then allowed to steep for variable periods of time. Afterward, the scientists measured how much lead remained in the water.
Compounds called catechins in tea leaves act like “little Velcro” hooks to which lead molecules latch, said Michelle Francl, a chemist at Bryn Mawr College and the author of a book on the chemistry of tea. Dr. Francl also said that the “ridges and valleys” of the tea leaves provided the necessary surface area for that interaction.
While those properties have been known for some time, Dr. Dravid and his colleagues were the first to look at the lead-detoxifying powers of a single cup of tea. They found that black tea leaves became wrinkled after roasting and were thus best equipped to absorb heavy metals.
“Green tea and black tea had fairly equivalent amounts of metal absorbed,” said another author, Benjamin Shindel, who was a doctoral candidate at Northwestern while working on the study.
White tea, on the other hand, undergoes a much more gentle preparation. Its leaves remain smooth, offering less surface area from which to draw heavy metals from water. Herbal tea enthusiasts may be disappointed to learn that chamomile tea does a poor job of heavy-metal filtering, too, probably because it is made with chamomile flowers, not tea leaves.
Still, these distinctions between different types of tea were not the most relevant factor. “It’s much more important how long you’re brewing the tea for,” Dr. Shindel said.
The researchers found that steeping a cup of black tea for five minutes could remove 15 percent of lead from the water, which is helpful, but there is “no safe level” of lead exposure, according to the E.P.A.
“With lead and other contaminants, any decrease is meaningful to some extent, especially if you have a lack of resources or infrastructure that would already remediate some of these problem materials,” said Caroline Harms, who was an undergraduate student of Dr. Dravid at Northwestern while working on the study.
The longer the steeping time, however, the more bitter the resulting tea. Last year, Dr. Francl caused a minor international scandal by suggesting that adding salt to tea could mitigate its bitterness. But even that controversial chemistry hack has its limits. “It’s not really drinkable after 10 minutes of steeping tea, and no amount of salt is going to help that,” she said.
Some samples in the study had to be steeped for 24 hours, which would render the tea undrinkable.
The study’s authors said they were less motivated to make public health prescriptions for policymakers than to study a hidden benefit of a global habit.
The researchers estimated that a country where people drank large amounts of tea would have about 3 percent less lead ingestion from the water supply than a (hypothetical) identical country that did not drink any tea.
“How wonderful,” said Henrietta Lovell, the founder of the Rare Tea Company. Ms. Lovell, who supplies teas to exclusive restaurants, pointed out that tea had been used in China for medicinal purposes for thousands of years. “The more I learn about tea, the more fabulous and fascinating it becomes,” Ms. Lovell said.
Dr. Francl believes that the new findings could eventually pave the way to a scalable method of making sure people aren’t ingesting heavy metals. “Given that clean water is such a global issue,” she said, “if there was a way to take this proof of concept and tweak it to produce potable water at the end, that would be pretty good.”
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A decades-long effort to develop a vaccine against one of the world’s leading causes of severe digestive illness has reached a milestone, according to new research.
Scientists recently developed a technology targeting enterotoxigenic Escherichia coli (ETEC), a bacterium responsible for millions of diarrheal illnesses each year.
The technology has now been licensed to French vaccine manufacturer Valneva for further development.
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The findings come after decades of research led by scientists at the University of Bergen and the Norwegian Research Center (NORCE).
One of the most common bacterial causes of severe diarrhea worldwide, ETEC is known to disproportionately affect children in low- and middle-income countries. Despite years of research, there is currently no broadly effective vaccine to prevent the infection, according to the study.
Researchers have made a major breakthrough in the decades-long effort to develop a vaccine against ETEC, a leading cause of diarrheal disease worldwide. (iStock)
The researchers focused on a toxin produced by ETEC that has long been considered one of the biggest obstacles to vaccine development.
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James Fleckenstein, MD, a professor of medicine and molecular microbiology at the Washington University School of Medicine in St. Louis, said the findings represent a promising step.
“We still have a lot of work to do to translate these findings to an actual vaccine,” Fleckenstein, who was not involved in the research, told Fox News Digital. “But the approach does look promising in the sense that the proteins elicit strong antibody responses that appear to offer protection against diarrheal illness after the first infection in children in developing countries.”
ETEC is a leading bacterial cause of severe diarrhea worldwide, especially among children in low- and middle-income countries. (iStock)
If the vaccine eventually reaches patients, researchers hope it could help protect children against some of the most severe forms of diarrheal disease caused by ETEC.
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In the meantime, Fleckenstein said travelers can take steps to reduce their risk of diarrheal illnesses. He recommends avoiding high-risk foods — including meals from street vendors in areas where sanitation may be poor — drinking bottled water in higher-risk regions, and practicing good hand hygiene.
While a vaccine is still years away, experts recommend avoiding high-risk foods, drinking bottled water and washing your hands to reduce the risk of ETEC. (iStock)
Fleckenstein also noted that vaccines are available to protect against typhoid fever, and said travelers should consult their physician before traveling internationally.
The research did have some limitations, the researchers noted.
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The technology is still in development and has not yet been tested as an approved vaccine among the public.
While the licensing agreement allows Valneva to continue advancing the research, additional laboratory studies, clinical trials and regulatory review will be required before the vaccine becomes available.
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Bryan Johnson, a biohacker and longevity guru who has claimed “we may be the first generation who won’t die,” revealed he has an autoimmune condition causing his stomach to “eat itself.”
The Los Angeles-based tech entrepreneur, 48, has previously shared publicly that he is hoping to live until the year 2140, when he would in theory be 160 years old.
Now, Johnson says he has been diagnosed with autoimmune gastritis (AIG), a chronic autoimmune disease in which the immune system attacks the stomach’s acid-producing parietal cells, reducing stomach acid and impairing vitamin B12 absorption, according to Nature Reviews Disease Primers.
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“My stomach is eating itself,” he wrote in an Instagram post. Johnson also shared that anywhere from 2% to 5% of people likely have this disease.
“I’m going to try to solve it,” Johnson went on. “Will share all.”
Bryan Johnson, a biohacker and longevity guru who has claimed “we may be the first generation who won’t die,” revealed he has an autoimmune condition causing his stomach to “eat itself.” (Getty Images)
The biohacker shared that as a child, he ate sugary cereal, drank sugary soda and “gobbled down fast food.”
“I became a young father of three and began building a business,” Johnson went on. “Juggling that stress and grind, I let my health slip and gained 40 lbs. Within a few years I’d fallen into a deep, chronic depression.”
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“Somewhere in that timeline, my body began developing an autoimmune process affecting my thyroid and then my stomach lining,” he added.
Fox News Digital reached out to Johnson for comment.
AIG can remain hidden and can be challenging to diagnose, Johnson noted, often surfacing years after damage has already occurred to the stomach. It can cause iron deficiency, B12 deficiency and anemia, and can also increase the risk of stomach cancer, the expert warned.
“Low iron stores get normalized and rarely investigated at all when anemia hasn’t shown up yet,” Johnson wrote. “That blind spot is what hid mine for a decade.”
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He also shared that for 11 years, he has had low levels of ferritin, a protein that stores iron inside the body’s cells. Ferritin releases iron when the body needs it, supports muscle function and carries out other essential processes.
“We continually tried to raise my iron levels with food and supplementation, but nothing would work,” he said.
The Los Angeles-based tech entrepreneur, 48, has previously shared publicly that he is hoping to live until the year 2140. (Getty Images)
Johnson acknowledged that some common biohacking techniques — including hard training, sauna and hyperbaric oxygen — all raise the body’s demand for iron.
“But none of them explained the core failure: Despite me taking iron orally, trailing every formulation and using every timing trick, none of the iron would stick.”
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Johnson underwent a colonoscopy and upper endoscopy, which examined his entire intestinal tract. Five biopsies were also taken from his stomach, which found “clear signs of early autoimmune gastritis: early atrophy confined to the acid-producing lining.”
In January 2026, the biohacker stated in a post on his website that “by 2039, my goal is immortality.”
“In the age of AI, multiomics, and custom-built DNA, proteins and cells, no condition should be presumed incurable simply because no one has yet tried to cure it with today’s stack,” Johnson said in his post. (Getty Images)
He detailed his strategy for defying aging, which includes embracing a strict regimen to slow or stop biological aging, using AI to accelerate longevity research, testing new treatments in lab-grown cells and organs, and reaching “longevity escape velocity” — in which medical advances would eventually extend lifespan faster than he ages.
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“I may fail at this task, but my team and I will try our best,” he wrote at the time.
There is currently no cure for AIG, which Johnson said he wants to change.
Johnson acknowledged that some common biohacking techniques — including hard training, sauna and hyperbaric oxygen — all raise the body’s demand for iron. (iStock)
“In the age of AI, multiomics, and custom-built DNA, proteins and cells, no condition should be presumed incurable simply because no one has yet tried to cure it with today’s stack.”
Johnson ended his post by urging others to prioritize their health.
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“Care for yourself, care for others, care for the planet and care for our animal friends. Care for life, as it’s the most precious gift there is.”
The longevity guru also shared an image showing the detailed findings of his five stomach biopsies.
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At 93, sprightly referee Frank Foster is still brandishing red and yellow cards and running the field three times a week for his local soccer association.
Having taken charge of around 5,500 matches over a 46-year officiating career, the great-grandfather credits his longevity and match-day stamina to a lifetime of healthy habits and a foundational diet, news agency SWNS reported.
Foster puts his remarkable fitness down to the strict wartime rations he was fed as a teenager, noting that it ensured he grew up eating “healthy food” rather than “sweets and cakes.”
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Decades later, his game-day preparation is still fueled by wholesome nutrition, always starting with a morning bowl of oatmeal, cereal or marmalade on toast to give him the energy to last the full 90 minutes.
The meal keeps him active enough to referee men’s, women’s and children’s games, a hobby he jokes he will never blow the final whistle on.
Frank Foster started refereeing in 1980. Today, he still officiates men’s, women’s and children’s games around three times a week. (SWNS)
His sharp mind and authoritative presence on the field are just as strong as his physical endurance.
A military veteran who aced his referee exam in 1980 with a 98% score, Foster relies on old-school discipline to keep matches under control, SWNS reported.
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He believes modern elite officials are too “soft” and allow player antics to ruin the sport. To maintain order and keep players from acting out, he lays down strict ground rules before kickoff. He has no patience for intimidation or theatrical diving. “Those who go down like they have been shot, well, I would just book them,” he said.
He is equally uncompromising when squads try to crowd him on the field.
Frank Foster is pictured before he became a referee. (Frank Foster/SWNS)
“I wouldn’t let them surround me at all,” Foster told SWNS.
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“I would say to the players, ‘Stay where you are,’ and ‘If you move one more inch, I will give you a yellow card.’ You need to stamp your authority and let them know who is in control.”
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He also avoids the modern stress of video-reviewing plays, which he believes creates unnecessary “aggression and disappointment” over microscopic offside calls, adding, “I think it spoils the game.”
Foster credits his longevity to wartime rations, adding that he avoided sweets. (SWNS)
“Sometimes it is only the player’s toe that is offside — it is ridiculous.”
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Foster says he “never thought” he’d still be doing this at age 93, but he makes the most of that gift.
He keeps his kit freshly washed, making sure it is “neat and tidy” for when he gets on that field.
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Foster, of South Yorkshire, England, also scrubs his black Adidas boots after every game, making sure they are “nice and clean” for his next match.
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