Health
Common respiratory bacteria detected in eyes of Alzheimer’s patients
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A bacterium prevalent in sinus infections and pneumonia may aggravate Alzheimer’s disease, according to a recent study published in Nature Communications.
The bacterium, Chlamydia pneumoniae, was found in the eyes of deceased patients with Alzheimer’s disease, according to researchers from Cedars-Sinai’s Health Sciences University in California.
“The retina is directly connected with the brain. It’s a developmental extension of the brain,” lead researcher Maya Koronyo-Hamaoui, PhD, professor of neurosurgery, neurology and biomedical sciences at Cedars-Sinai Health Sciences University, told Fox News Digital.
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Eye-brain link
The study showed that Chlamydia pneumoniae could reach the retinal tissue that lines the back of the eye and linger for several years, creating an inflammatory response potentially linked to the death of nerve cells. This could contribute to cognitive decline and could worsen Alzheimer’s disease symptoms.
A bacterium prevalent in sinus infections and pneumonia may aggravate Alzheimer’s disease, according to a recent study published in Nature Communications. (iStock)
The findings point to potential therapies for Alzheimer’s disease that would target inflammation and provide antibiotic treatment in the early stages of infection, according to Koronyo-Hamaoui.
“One hope of this study is that when people do present with some [symptoms of] pneumonia or atypical pneumonia or some respiratory infection, doctors should consider testing specifically for Chlamydia pneumoniae, and then give them the specific antibiotic,” the researcher said.
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The infection can be identified through laboratory testing, including PCR (polymerase chain reaction), blood tests, or cultures that allow live organisms to grow for analysis.
Inside the study
The researchers examined retinal tissue samples from over 100 deceased individuals who fell into three groups: those who had Alzheimer’s disease, those who had some cognitive deficit or those who did not have the disease.
“The retina is directly connected with the brain. It’s a developmental extension of the brain,” the lead researcher said. (iStock)
They analyzed proteins, conducted genetic testing and used advanced imaging techniques on the samples. Those with Alzheimer’s disease had higher levels of the bacterium in their brains and retinal tissue compared to those who had normal cognition, the release stated.
Genetic risk
Higher levels of chlamydia pneumonia were found in those who carried the gene variant APOE4, which is an associated risk factor for Alzheimer’s disease, Koronyo-Hamaoui added. The bacterium was also associated with more severe cognition decline.
Those with Alzheimer’s disease had higher levels of the bacterium in their brains and retinal tissue compared to those who had normal cognition. (iStock)
The Cedars-Sinai team also looked at human neurons and lab mice with Alzheimer’s disease, finding that Chlamydia pneumoniae was linked to increased inflammation, nerve cell death and cognitive decline, further suggesting that it may play a role in accelerating the disease.
The infection also prompted production of amyloid-beta, which is a protein known to accumulate in the brains of those with Alzheimer’s, Koronyo-Hamaoui said.
While the study points toward using the retina as a way to diagnose and monitor the disease, the researcher acknowledged that more research is needed to confirm these findings.
Experts urge caution
Dr. Aaron Glatt, chief of infectious diseases at Mount Sinai South Nassau on Long Island, New York, was not involved with the study but called the findings “interesting.”
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Glatt, who is also a spokesperson for the Infectious Diseases Society of America, emphasized that the findings only show an association and not causation, and that much more clinical research is needed.
“It does not mean infections cause Alzheimer’s or that people should worry about past respiratory illnesses.”
“Chlamydia pneumoniae is a very common respiratory pathogen that many people are exposed to throughout their lives,” he told Fox News Digital. “While the study identifies a link between this bacterium and neurodegeneration, a standard sinus infection does not mean a patient will develop Alzheimer’s.”
The key takeaway, according to Glatt, is that the study opens new doors for potential diagnostics and treatments, but is “not a reason for immediate alarm regarding common infections.”
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Dr. Sharon Fekrat, MD, a clinical spokesperson for the American Academy of Ophthalmology and a retina specialist at the Duke University School of Medicine in North Carolina, agreed that the findings could help researchers better understand how inflammation may drive disease progression and “could lead to new ways to detect or treat Alzheimer’s in the future.”
The infection also prompted production of amyloid-beta, which is a protein known to accumulate in the brains of those with Alzheimer’s. (iStock)
“This is early research suggesting that infection-related inflammation may worsen Alzheimer’s disease in people who are already vulnerable,” Fekrat, who also did not work on the study, told Fox News Digital. “It does not mean infections cause Alzheimer’s or that people should worry about past respiratory illnesses.”
What’s next
While some teams are developing and testing retinal imaging tools in living patients, those methods are not yet part of routine clinical screenings or diagnosis, Fekrat noted.
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For now, the best proven steps include following brain-healthy habits, such as managing cardiovascular risk factors, staying mentally and socially engaged, and seeking medical care for any cognitive symptoms, the expert added.
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Just four minutes of daily strength exercises can dramatically improve mobility, balance and leg strength in older adults, per new research from the Penn State College of Medicine.
Standard public health guidelines recommend at least 150 minutes of moderate exercise per week. However, the study suggests that fewer than one in five older adults meet the recommended muscle-strengthening guidelines.
The research team designed a home-based program called Functional Activity Strength Training, or FAST-2. They evaluated 97 sedentary participants 65 and older, with an average age of 74.
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Before entering the study, these individuals were averaging just 18 minutes of total physical activity each week.
The older adults were randomly split into two groups, with one group performing the daily exercise routine and the other serving as a control group that received no intervention, according to the study’s press release.
Just four minutes of daily home strength training can significantly improve mobility, balance and leg strength in older adults, according to a Penn State College of Medicine study. (iStock)
Participants performed four basic movements for 30 seconds each, separated by 30-second rest intervals. The entire routine lasted exactly four minutes. The circuit consisted of push-ups, chair stands, two-arm resistance-band rows and stair stepping.
To keep the routine accessible, researchers provided written explanations and simple modifications. For example, participants could perform push-ups against a kitchen counter or wall, or use their hands on their knees for support during chair stands.
Participants were also given four elastic resistance bands and an adjustable step platform.
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“Exercise is actually really complicated, because you have to decide how many repetitions, how far, how many sets, how much rest and how many times per week,” co-author Smita Dandekar, associate professor of pediatrics at Penn State College of Medicine, said in the press release.
“It’s hard work … so if we can make it short, we’re part [of the] way there.”
The program consisted of four basic movements: push-ups, chair stands, resistance-band rows and stair stepping. (iStock)
As the participants grew stronger, they were encouraged to progress to higher levels of difficulty, such as transitioning away from modifications or increasing the height of the stepper.
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After 12 weeks, the results suggested that a tiny dose of regular exercise could yield noticeable physical benefits. In a 30-second chair-stand test, the exercise group performed an average of 4.2 more repetitions than the control group.
“These indicators … give you a sense of whether or not you’re going to be able to be active in the future.”
The adults doing the exercises also shaved 2.3 seconds off their time during a test measuring how they could stand up and sit down five times consecutively. Furthermore, they extended their one-legged balance time by an average of 3.6 seconds.
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The researchers emphasized that these specific measurements are critical medical indicators of an older adult’s future health.
By keeping the routine ultra-short, researchers eliminated common barriers like time constraints and exhaustion, resulting in an exceptionally high 81% workout completion rate. (iStock)
“These indicators predict your future ability to go into a nursing home, your future likelihood of falling and of developing difficulty walking,” noted lead author Christopher Sciamanna, professor of medicine and of public health at Penn State College of Medicine, in the press release.
“They give you a sense of whether or not you’re going to be able to be active in the future.”
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While traditional home exercise programs generally see low engagement, the participants in this study successfully completed their workouts on 81% of the tracked days, according to the researchers.
After 12 weeks, exercising seniors gained the ability to complete an average of four more chair-stand repetitions than those who did not exercise. (iStock)
The study had several noted limitations. As it tracked a relatively small sample size of fewer than 100 individuals over a brief 12-week time frame, it is unknown whether these mobility gains can be sustained long-term.
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Additionally, the researchers did not specify the exact dropout rates or detail how the routine might affect seniors who already relied on assistive devices like walkers or canes.
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Because the final trial results reflected a specific group of participants who met the entry criteria, further investigation is required to determine whether the short routine can safely benefit older adults facing more severe physical limitations or cognitive decline.
The study was published in the journal PLOS One.
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Jill Smokler, founder of Scary Mommy, has died at age 48 after a battle with glioblastoma, an aggressive form of brain cancer.
The popular “mommy blogger” had been fighting the disease for the past two years, according to an announcement posted on ScaryMommy.com on Monday.
The stay-at-home mother of three launched the blog in 2008 as a place to share the “joys and pitfalls” of parenting, according to the article.
As Scary Mommy expanded from a personal blog into a major parenting brand, Smokler built a following with her honest, often self-deprecating take on motherhood. She went on to speak at blogging conferences, author bestselling books, appear on national television programs and earn three Webby Awards, her biography states.
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“Jill spent her life telling the truth about motherhood — that it could be wonderful and impossible in the very same breath — and in doing so, she gave millions of women permission to stop pretending and feel a little less alone,” her family shared in a statement following her passing.
Jill Smokler, founder of Scary Mommy (pictured in 2018), has died at age 48 after a battle with glioblastoma, an aggressive form of brain cancer. (Lloyd Fox/Baltimore Sun/ZUMA Press Wire / Shutterstock)
“She was funny, fearless, generous and entirely herself. More than anything she built, Jill was proudest of her three children, Lily, Ben and Evan. We are heartbroken to lose her, and endlessly proud of the mark she left on the world.”
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Smokler’s first sign of the disease was in April 2024, when she experienced a sudden seizure. She then underwent surgery to remove a brain tumor, after which she didn’t recognize her own children, she previously shared with Today.
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“I am definitely grateful that I don’t remember the looks on their faces when I didn’t recognize them,” she said. “That must have been gutting.”
Smokler was diagnosed with glioblastoma, the most common malignant primary brain tumor in adults and one of the deadliest forms of brain cancer. There is currently no cure.
About 13.9% of all brain tumors are glioblastomas, according to the American Brain Tumor Association. (iStock)
Following surgery, the blogger underwent radiation and chemotherapy, during which she was open about her treatment side effects, including fatigue and hair loss. Additional surgeries and clinical trials followed, according to previous interviews.
“Thank you, Jill, for everything. May you rest in peace,” the Scary Mommy post concluded.
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About 13.9% of all brain tumors are glioblastomas, according to the American Brain Tumor Association. More than 12,000 new cases are diagnosed in the U.S. each year.
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Median survival is approximately 12 to 18 months after diagnosis, even with treatment. Only about 5% to 7% of patients survive five years after diagnosis, data shows.
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Common food preservatives may contribute to higher risks of high blood pressure and cardiovascular disease, according to a large French study.
Researchers analyzed data from 112,395 adults averaging 42 years of age, assessing their detailed dietary intake with an average follow-up of nearly eight years.
Among the participants, 5,544 developed hypertension during the follow-up period, and 2,450 experienced cardiovascular disease events.
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Higher consumption of total non-antioxidant preservatives was associated with a 29% greater risk of hypertension and a 16% higher risk of cardiovascular disease.
Higher consumption of total antioxidant preservatives was linked to a 22% spike in hypertension risk.
Common food preservatives may contribute to higher risks of high blood pressure and cardiovascular disease, according to a large French study. (iStock)
Out of the 17 preservative additives consumed by at least 10% of participants, eight in particular were associated with higher rates of hypertension, including the following.
- Potassium sorbate
- Sorbic acid
- Sodium nitrite
- Potassium nitrite
- Sodium metabisulphite
- Potassium metabisulphite
- Citric acid
- Tripotassium citrate
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Only one of the preservatives – ascorbic acid, which is the food additive form of vitamin C – was significantly associated with higher cardiovascular disease risk.
The finding does not mean that dietary vitamin C itself causes cardiovascular disease, the researchers noted. The study examined ascorbic acid in the form used as a food additive in processed foods, not vitamin C from fruits, vegetables or supplements.
Out of the 17 preservative additives consumed by at least 10% of participants, eight in particular were associated with higher rates of hypertension. (iStock)
The findings were published in the European Heart Journal.
“This is a very important study that puts together what we already know – that preservatives of all kinds raise blood pressure and contribute directly to heart disease and stroke over eight years,” Dr. Marc Siegel, Fox News senior medical analyst, told Fox News Digital.
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“Whereas potassium itself can lower blood pressure, the additive potassium sorbate has previously been found to be associated with hypertension in a large study in the European Heart Journal,” the doctor, who was not involved in the study, told Fox News Digital. “Potassium metabisulphite was also found to raise pressure in the same study.”
The same was found for sodium nitrite in the new study, Siegel noted, with 73% of participants consuming it regularly – “mostly in processed foods like hot dogs, ham, bacon and deli meats.”
“Preservatives of all kinds raise blood pressure and contribute directly to heart disease and stroke over eight years,” a doctor told Fox News Digital. (iStock)
“This has been found in previous research for many years,” he added.
Siegel also discussed the 22% increased risk linked to ascorbic acid. “I am dubious about this association, as it has not generally been found before, but perhaps the risk is when it is used as a chemical preservative.”
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“For all the sodium additives, this is expected, but surprising with extracts of rosemary and citric acid – the key to both of these ingredients is when they are used as preservatives (chemicals),” he added.
Potential limitations
As this was an observational study, it could not prove that the additives caused the health conditions.
Also, the participants who volunteered for the study were generally healthier, more educated and more often female than the general French population, the researchers noted.
As this was an observational study, it could not prove that the additives caused the health conditions. (FG Trade / Getty Images)
There was also the chance that hypertension was underdiagnosed in some participants.
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While the researchers estimated people’s dietary intake as accurately as possible, there was a chance that some consumption was inaccurately reported.
The authors emphasized that these findings need to be confirmed in further research of other populations.
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If the results are replicated in future research, some food preservatives may face additional safety reviews focused on their effects on the cardiovascular system, the researchers suggested.
“The take-home is to use natural ingredients as much as possible, and especially beware of sodium chemical preservatives when it comes to risk of heart disease and stroke from associated hypertension,” Siegel concluded.
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