Health
Some 80-year-olds still have razor-sharp brains — and now scientists know why
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Older adults classified as “SuperAgers” generate at least twice as many neurons in the hippocampus than their typical aging peers, a new study has revealed.
These findings, released on Wednesday by the University of Illinois Chicago and Northwestern University, could help explain why SuperAgers have exceptional memory and cognitive resilience even well past 80 years old.
Northwestern has been studying SuperAgers for decades, defining them as “extraordinary individuals aged 80 and above whose memory performance rivals that of people three decades younger.” The researchers use special memory recall tests to make this determination.
In this study, they analyzed post-mortem brain tissue — nearly 356,000 individual cell nuclei — with a focus on the hippocampus, which is essential for forming new memories and supporting learning and spatial navigation.
They compared tissue from SuperAgers, typical older adults, older adults with early dementia/Alzheimer’s and younger healthy adults.
SuperAger Ralph Rehbock sits with his wife in his home. New findings from the University of Illinois Chicago and Northwestern University could help explain why SuperAgers have exceptional memory and cognitive resilience well past 80 years old. (Shane Collins, Northwestern University)
The researchers found that SuperAgers produced at least twice as many new neurons compared to “cognitively normal” older adults and those with Alzheimer’s pathology.
They also found that changes in certain brain support cells (astrocytes) and key memory cells (CA1 neurons) are linked to preserved cognitive ability, helping to keep the brain sharp with age.
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The SuperAgers also had different genetic activity patterns in their brains compared to those in Alzheimer’s disease.
“SuperAgers have more immature neurons and neuroblasts in the hippocampus, which is an indication of stronger neurogenesis when compared with other groups,” study co-author Changiz Geula, research professor of cell and developmental biology and neuroscience at Northwestern University Feinberg School of Medicine, told Fox News Digital.
Northwestern University study co-author Ivan Ayala examines a SuperAger brain sample on a slide. (Shane Collins, Northwestern University)
“The study also showed that specific cells in the hippocampus show unique gene expression profiles that relate to neuronal function and transmission and are associated with superior cognitive function.”
The findings were published in the journal Nature.
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“We’ve always said that SuperAgers show that the aging brain can be biologically active, adaptable and flexible, but we didn’t know why,” said co-author Tamar Gefen, associate professor of psychiatry and behavioral sciences at Northwestern University Feinberg School of Medicine and a neuropsychologist at Northwestern’s Mesulam Institute for Cognitive Neurology and Alzheimer’s Disease, in the release.
“This is biological proof that their brains are more plastic, and a real discovery that shows that neurogenesis of young neurons in the hippocampus may be a contributing factor.”
Dr. Tamar Gefen examines a slide of a SuperAger brain. (Shane Collins, Northwestern University)
Dr. Marc Siegel, Fox News senior medical analyst, commented that the study discovered signs of plasticity and regeneration in SuperAgers.
“It confirmed not only preservation of brain tissue in the hippocampus, which is crucial for memory and cognition, but also regeneration and increased development of brain cells in that area,” Siegel, who was not involved in the study, told Fox News Digital.
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“This is an important study because it may lead to certain cell gene treatments that could lead to more SuperAgers,” the doctor said. “It may also lead to more advanced testing to determine who will be a SuperAger and guide clinical treatment and management.”
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The study did have some limitations, primarily that the research relied on tissue samples taken at one specific point, instead of tracking changes over time.
Brain samples are fixed in blocks of wax so they can be stored and examined. (Shane Collins, Northwestern University)
Geula noted that studies using human brain tissue typically involve fewer cases than animal research, which can be a limitation. However, he emphasized that each case in this study was analyzed thoroughly.
“While these findings are not directly translatable to changes in everyday life and activities, they suggest that cognitive resilience is associated with greater integrity of many brain systems,” he told Fox News Digital. “This implies that attending to brain health is crucial for maintaining cognitive function in old age.”
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“Thus, maintaining good overall health by keeping systemic diseases in check, maintaining a healthy diet and exercise, and ensuring the elderly remain mentally active assume more importance.”
The study was funded by the National Institute on Aging, which is part of the National Institutes of Health.
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The American Cancer Society (ACS) has updated its guidelines for colorectal cancer screening.
The organization released the update in its flagship journal on Wednesday, noting that the new recommendations “re-affirm” that adults at average risk should be screened for colorectal cancer at age 45 and continue through 75, for those with a life expectancy greater than 10 years.
In addition to the standard colonoscopy, the ACS also recommends that patients receive a blood-based screening test in a doctor’s office, which is designed to detect tumor DNA in the blood.
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The ACS also suggested an at-home screening option that looks for hidden blood and molecular markers in stool samples.
These new guidelines reflect recent advancements in disease detection, as well as a “critical shift in public health strategy to expand screening options and lower barriers to access,” the ACS stated in a press release.
The ACS recommends blood-based testing and at-home stool sampling as options for colorectal cancer screening. (iStock)
Dr. Robert Smith, senior vice president of early cancer detection science at the American Cancer Society and senior author of the report, wrote in a statement that colorectal cancer should be emphasized as a “highly preventable disease as much as a treatable one.”
“By offering more screening tools in our guideline update, more eligible adults will be able to participate in lifesaving colorectal cancer testing, helping to close the screening gap and catch more cancers at an earlier, treatable stage,” he added.
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According to the ACS, colorectal screening “dramatically improves survival,” as studies show early-stage detection yields a five-year survival rate of more than 90% in the U.S.
About one in three American adults are eligible for colorectal cancer screening but have not been tested, although ACS research marks colorectal cancer as the top cancer killer of adults under 50.
Colorectal cancer is the top cancer killer of adults under the age of 50, according to the ACS. (iStock)
People at a high risk of colorectal cancer may need to begin screening before age 45 or be screened more often, the ACS added. Those over 85 years old should no longer be screened for colorectal cancer, per the guidelines.
Dr. William Dahut, chief scientific officer at the ACS, commented that “no matter which test you choose, what’s most important is to get screened, and that includes underserved, rural and minority populations.”
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These guideline changes follow a surge in colorectal cancer diagnoses in younger individuals. Recent ACS research revealed a 50% relative increase in diagnoses in adults aged 45 to 49 from 2021 to 2022.
Dr. Aparna Parikh, medical director of the Center for Young Adult Colorectal Cancer at the Mass General Cancer Center, who is not affiliated with the ACS, shared that experts don’t “entirely understand why” cases are on the rise.
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“But it seems to be an interplay of a person’s risk factors, overall makeup and early exposures,” she previously told Fox News Digital. “[Those] include dietary exposures, environmental exposures and possible antibiotic exposures, as well as lifestyle factors in the right host.”
Changes in bowel habits are the primary red flag that should raise the suspicion of colorectal cancer. (iStock)
Another recent ACS study found that drinking heavily and consistently over an adult’s lifetime could lead to a higher risk of colorectal cancer.
Other known risk factors include family history, obesity, smoking, a diet high in red and processed meats, inflammatory bowel disease, and a personal history or family history of polyps.
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While there may be no symptoms of colorectal cancer before diagnosis, especially in the early stages, certain symptoms should not be overlooked, experts say.
Dr. Eitan Friedman, PhD, an oncologist and founder of The Suzanne Levy-Gertner Oncogenetics Unit at the Sheba Medical Center in Israel, confirmed to Fox News Digital that changes in bowel habits are the primary red flag that should raise the suspicion of colorectal cancer.
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Other symptoms include fatigue as a result of anemia, stomach pain or abdominal discomfort, rectal bleeding or blood in the stool, weakness and unexplained weight loss.
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The sudden death of Kyle Busch has drawn attention to a rare but devastating medical progression: when pneumonia escalates into fatal sepsis.
An ER doctor spoke with Fox News Digital about how sepsis can trigger a rapid health decline.
“Sepsis is actually not a specific disease or diagnosis, but rather the syndrome that occurs when the body has certain abnormal findings and a presumed infection,” said Dr. Kenneth J. Perry, a South Carolina-based emergency medicine physician.
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The markers of sepsis include elevated white blood cell counts, a high or low temperature, and elevated heart and respiratory rates, according to Perry. Because of this, a patient with pneumonia is often already technically septic by definition.
In the wake of Kyle Busch’s sudden passing, there is a focus on the rapid decline from pneumonia to fatal sepsis. (Getty; iStock)
While many people assume a worsening infection means bacteria are multiplying uncontrollably, it often has more to do with the body’s internal environment.
“It is often not the bacteria itself that is causing the specific decline,” Perry said. “In most cases, it is a cascade of inflammatory processes that are set in motion by the infection.”
When this inflammation spirals out of control, the body moves from having a manageable infection into severe sepsis. This is when otherwise healthy people can rapidly deteriorate.
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“The concerning thing that can happen with any individual … is that sepsis can then lead to low blood pressure, worsening vital signs and organ damage,” Perry said.
“As multiple organs fail, it becomes very difficult for the medical team to treat and can sometimes lead ultimately to death.”
“The medical evaluation provided to the Busch Family concluded that severe pneumonia progressed into sepsis, resulting in rapid and overwhelming associated complications,” the family shared in a statement. (James Gilbert/Getty Images)
It is very unlikely to have pneumonia and not have any symptoms, according to Perry. Early signs can mimic a severe flu, including fevers, chills, a productive cough, and chest or back pain in cases where the lung is infected.
When sepsis begins to take hold, time becomes the most critical factor. “We have known for a number of years that early antibiotic therapy is beneficial in the treatment of sepsis,” Perry said.
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If you or a loved one are managing an infection at home, the doctor says the following red flags mean you should bypass the clinic and head straight to the emergency room.
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- Shortness of breath or difficulty breathing
- A racing heart rate or fever that continues to worsen even after starting treatment
- Severe chest pain associated with a productive cough
The slide into sepsis is, in most cases, a cascade of inflammatory processes that are set in motion by the infection, the doctor said. (iStock)
While cases like Busch’s are tragic, Perry stressed that this shouldn’t cause widespread panic. Most patients with pneumonia do very well with standard oral antibiotics.
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The NASCAR star’s rapid decline underscores the importance of medical vigilance and “having a primary care physician with whom you have a good relationship,” according to the ER doctor.
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“Monitoring symptoms while having easy access to primary care is a very beneficial and appropriate plan for most patients,” he added.
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