Health
Red meat could raise dementia risk, researchers claim, yet some doctors have questions
While red meat is a rich source of protein, iron and other nutrients, a recent study linked it to an increased risk of dementia — but some doctors are casting doubt on the claim.
Researchers from the Harvard T.H. Chan School of Public Health and Mass General Brigham found that daily consumption of certain amounts of processed red meats increased dementia risk by 13%, according to a press release.
It was also tied to a 14% higher risk of developing subjective cognitive decline and faster brain aging.
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“The findings did not really surprise us,” lead study author Yuhan Li, a researcher from Harvard T.H. Chan School of Public Health in Boston, told Fox News Digital.
Researchers from the Harvard T.H. Chan School of Public Health and Mass General Brigham found that daily consumption of certain amounts of processed red meats increased dementia risk, but some doctors are casting doubt. (iStock)
“The results are generally in line with our hypothesis, showing that a higher intake of red meat, particularly processed red meat, is associated with an increased risk of developing dementia and worse cognition.”
The increased risk was seen in people who ate at least one-quarter of a serving of unprocessed meats per day, according to the research article. This equates to around one hot dog, two slices of bacon, or one and a half slices of bologna.
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The researchers also suggested that replacing one serving of processed red meat per day with a serving of nuts and legumes could reduce dementia risk by 19% — and that replacing it with fish could reduce the risk by 28%.
The study included 133,771 individuals, 11,173 of whom received a dementia diagnosis over a four-decade span. The data came from the Nurses’ Health Study (NHS) and Health Professionals Follow-Up Study (HPFS), which tracked participants’ dietary choices and health status.
The increased risk was seen in people who ate at least one-quarter of a serving of unprocessed meats per day, which equates to around two slices of bacon, one hot dog, or one and a half slices of bologna. (iStock)
Funded by the National Institutes of Health, the study was published on Jan. 15 in the journal Neurology.
The findings were first presented at the Alzheimer’s Association International Conference (AAIC) earlier in 2024.
Experts react to the findings
“There are many reasons to believe that too much red meat is linked to dementia,” Dr. Marc Siegel, clinical professor of medicine at NYU Langone Health and Fox News senior medical analyst, told Fox News Digital.
“In the case of processed meat like bacon and ham, the chemicals added may also lead to dementia via inflammation and neuroinflammation,” added Siegel, who was not involved in the new research.
The researchers suggested that replacing one serving of processed red meat per day with a serving of nuts and legumes could reduce dementia risk by 19%. (iStock)
The doctor also warned of red meat potentially leading to weight gain and obesity, which can cause inflammation and in turn raise the risk of dementia.
“Red meat may also lead to heart disease, which increases dementia risk,” Siegel noted.
Theresa Gentile, a registered dietitian nutritionist and spokesperson for the Academy of Nutrition and Dietetics in New York, noted that previous research has found an association between red meat — especially processed red meat — and an increased risk of type 2 diabetes and cardiovascular disease, which are both related to impaired cognitive health.
“There isn’t a single food or ingredient that … has been shown to cause, increase risk, prevent, treat or cure Alzheimer’s or other dementias.”
“This was a large study conducted over a long period of time and was adjusted for confounding factors and still found that, in three different groups, eating more processed red meat was associated with cognitive decline than eating less,” Gentile, who did not work on the study, told Fox News Digital.
Some experts suggested that the risk is linked more to ultraprocessed foods in general rather than specific meats.
“The results are generally in line with our hypothesis, showing that a higher intake of red meat, particularly processed red meat, is associated with an increased risk of developing dementia and worse cognition,” said one of the researchers (not pictured). (iStock)
Heather M. Snyder, Ph.D., senior vice president of medical and scientific relations at the Alzheimer’s Association in Chicago, pointed out that a number of studies have suggested that diets with more ultraprocessed foods are bad for brain health.
“For example, a report at the AAIC 2022 found that people who eat large amounts of ultraprocessed foods have a faster decline in cognition,” Snyder, who was not involved in the new study, told Fox News Digital.
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“More than 20% of daily intake of ultraprocessed foods led to a 28% faster decline in global cognitive scores, including memory and verbal fluency.”
It is “unlikely” that one food will have a “significant beneficial or detrimental effect on a disease as complex as Alzheimer’s,” according to Snyder.
“There isn’t a single food or ingredient that, through rigorous scientific research, has been shown to cause, increase risk, prevent, treat or cure Alzheimer’s or other dementias,” she stated.
Potential study limitations
Siegel noted that the study was observational, which means that “no strict conclusions can be drawn.”
“We still need double-blinded, randomized trials to draw more definite conclusions,” he said.
It is “unlikely” that one food will have a “significant beneficial or detrimental effect on a disease as complex as Alzheimer’s,” one expert stated. (iStock)
Lead study author Yuhan also acknowledged the potential limitations.
“The Nurses’ Health Study enrolled female registered nurses, and the Health Professionals Follow-Up Study enrolled U.S. male health professionals,” she told Fox News Digital.
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“These participants tend to have higher educational attainment and income levels, and therefore, the study’s generalizability may be limited. In addition, because this study is an observational study, residual confounding remains a possibility.”
Dr. Ken Berry, a family physician and diabetes specialist in Tennessee, was not involved in the study but shared his thoughts on “healthy user bias” potentially skewing the results.
“The people who are eating the least amount of processed meat and the least amount of red meat in these studies — they were also exercising every day,” one doctor noted when speaking about the research. (iStock)
“The people who are eating the least amount of processed meat and the least amount of red meat in these studies — they were also exercising every day,” he said in a video posted on his YouTube channel last week.
“They absolutely did not smoke. They did not drink to excess. They were trying their best to live a healthy life.”
“We still need double-blinded, randomized trials to draw more definite conclusions.”
Research has shown that exercising regularly and eating whole, unprocessed foods can decrease the risk of dementia, Berry noted.
“I don’t think any nutrition expert would argue with that,” he said, but added that there is “no evidence whatsoever” that red meat is linked to higher dementia risk.
Healthy dietary tips
Gentile recommended limiting servings of processed red meats like bacon, sausage, hot dogs and deli meats to less than a quarter of a serving per day, and to consider healthier protein alternatives like fish, nuts, legumes and chicken.
“A balanced diet with moderation in terms of protein sources and serving size is key,” Gentile said. “If your diet is heavy in processed red meats, try swapping one of those servings out for beans, fish or chicken.”
One registered dietitian recommended limiting servings of processed red meats and considering protein alternatives like fish, nuts, legumes and chicken. (iStock)
The nutritionist also suggested including brain-boosting foods each day, like fruits, vegetables, whole grains and healthy fats.
The Alzheimer’s Association has long encouraged eating a balanced diet to help prevent Alzheimer’s disease and all other dementia types, Snyder noted.
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“That includes foods that are less processed to ensure that our bodies get the needed nutrients, because they’ve been associated with a lower risk of cognitive decline,” she told Fox News Digital.
“As research continues, we may uncover other dietary patterns that increase or decrease our risk.”
Berry pointed out that while he is a self-described “carnivore,” he is not completely “anti-plant.”
“I’m a proponent of a proper human diet, which ranges from low-carb with vegetables and berries and nuts, to keto with a few berries and vegetables and nuts, to ‘ketovore’ with just a little veg for flavor and garnish, all the way to carnivore,” he said in his video.
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The best diet for any individual should depend on multiple factors, he said, including their overall metabolic health, age, weight, genetics and gut microbiome.
Added Berry, “That’s the proper human diet spectrum.”
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Amid warnings of a Legionnaires’ disease outbreak on Manhattan’s Upper East Side, health experts say that early recognition of symptoms can mean the difference between a quick recovery and life-threatening complications, especially for high-risk groups.
New York City health officials are urging anyone who has visited the east side of Central Park or Manhattan’s Upper East Side since late June to watch for symptoms.
As of July 6, the New York City Health Department had confirmed 23 cases and 17 hospitalizations associated with the respiratory infection. No deaths have been reported.
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Officials are investigating contaminated cooling towers as the likely source. They have emphasized that the illness is not spread person-to-person and is not linked to the city’s drinking water.
Health experts say that early recognition of symptoms can mean the difference between a quick recovery and life-threatening complications, especially for high-risk groups. (iStock)
“Legionnaires’ disease is deadly but can be effectively treated if diagnosed early,” said NYC Health Commissioner Dr. Alister Martin in a press release. “New Yorkers at higher risk, including anyone who is 50 and older, those who smoke or people with chronic lung conditions should be especially mindful of their symptoms and seek care as soon as symptoms begin.”
What is Legionnaires’?
Legionnaires’ disease is a type of pneumonia caused by Legionella bacteria.
The bacteria is usually found in lakes, streams and other freshwater environments, but can grow in any area where water sits for a long time, according to the CDC.
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That can include shower heads, sink faucets, hot tubs, water features/fountains, plumbing systems and other water systems.
When people swallow or breathe in droplets of water that contain Legionella, they can potentially become ill.
Although human transmission is possible in rare cases, the disease is not typically transmitted among people, per the Centers for Disease Control and Prevention.
Symptoms of infection
Infections can lead to severe pneumonia in older people and those with compromised immune systems, according to Dr. Andrew Handel, a pediatric infectious diseases expert at Stony Brook Children’s Hospital on Long Island, New York.
Symptoms of Legionnaires’ disease usually show up between two and 14 days after exposure.
New York City health officials are urging anyone who has visited the east side of Central Park or Manhattan’s Upper East Side since late June to watch for symptoms. (iStock)
“Legionella infections cause symptoms that are similar to other forms of pneumonia — fever, coughing, difficulty breathing, shortness of breath and chest pain,” Handel previously told Fox News Digital.
“Legionnaires’ disease is deadly but can be effectively treated if diagnosed early.”
The signs are similar to other types of pneumonia, and include the following:
- Cough
- Fever
- Shortness of breath
- Muscle aches and headaches
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Some patients may also experience nausea, diarrhea and confusion, the CDC noted.
Diagnosis, treatment and prevention
A medical professional can diagnose the infection with laboratory tests and chest X-rays.
The condition is typically treated with antibiotics. In cases of severe infection, hospitalization may be required for breathing support and IV hydration.
Around 10% of people who contract Legionnaires’ disease will die from those complications — and the mortality risk rises to 25% for those who get Legionnaires’ while staying in a healthcare facility, according to the CDC.
The bacteria is usually found in lakes, streams and other freshwater environments, but can grow in any area where water sits for a long time, according to the CDC. (iStock)
“Treatment needs to be early and aggressive,” Dr. Nathan Goodyear, an Arizona-based integrative medicine expert, previously told Fox News Digital. “Legionella infection is an intracellular infection that requires antibiotic treatment.”
Antibiotics that are appropriate for Legionella infection include Levofloxacin and Azithromycin.
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“Therapy can be prescribed orally in healthy individuals… but intravenous antibiotics often prove to be the initial option for treatment secondary to the pathogenicity of the disease,” Goodyear said.
Currently, there are no vaccines for Legionnaires’ disease.
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The best strategy to prevent infection is to reduce the growth and spread of the Legionella bacteria. The CDC recommends that building owners and managers use a water management program to reduce the risk.
“New Yorkers at higher risk, including anyone who is 50 and older, those who smoke or people with chronic lung conditions should be especially mindful of their symptoms and seek care as soon as symptoms begin,” city officials stated. (iStock)
To prevent serious illness from Legionnaires’, Goodyear recommends that all smokers kick the habit, and also emphasizes the need to “aggressively support” chronic pulmonary disease.
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“Increasing immune support (vitamin D3, vitamin C, Zinc) is required to counter the immune dysfunction associated with advancing age.”
Obesity is another foundational risk factor for all chronic inflammatory diseases, the doctor added.
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Journalist Katie Couric is sharing a scary medical episode that she experienced on June 27.
In a post on Substack titled “The Day I’ll Never Remember,” she detailed a sudden episode that left her unable to recall the current month, year and president.
“I thought it was 2024. And I believed Joe Biden was president,” she wrote.
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The event occurred while Couric was attending the Aspen Ideas Festival in Colorado, during which she participated in two public panels — one on AI and one on journalism — both of which she cannot remember at all.
“I have no idea what we talked about, or of what occurred when the panels ended,” she said.
Journalist Katie Couric is sharing a scary medical episode that she experienced on June 27. (Getty Images)
John Molner — Couric’s husband, who was in attendance at the festival and the two panels — also shared his account.
After the event, someone told Molner that Katie wasn’t feeling well. When he reached her, an EMT and a doctor were tending to her. “I could tell something was off,” he wrote. “It could have been altitude sickness, but Katie was definitely not all there.”
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At the hospital, when Couric struggled to recall the year, the president and her grandchildren’s names, doctors began checking for a stroke.
An MRI revealed no signs of stroke, which was a relief, but “Katie’s ‘fog’ became a lot more apparent,” Molner wrote.
John Molner, Couric’s husband, who was in attendance at the festival and the two panels, also shared his account. (Getty Images)
“She repeatedly asked me the same questions: ‘What was I doing before we got to the hospital?’ ‘Why am I at the hospital?’”
Couric was ultimately diagnosed with transient global amnesia, a sudden, temporary episode of memory loss that prevents a person from forming new memories and may also erase some recent memories, according to Mayo Clinic.
“The cause seems to be as mysterious as the brain itself.”
It is not caused by a stroke, seizure or head injury, and it usually resolves completely within 24 hours.
“[It’s] just a very weird neural episode that’s pretty uncommon and, at least in most cases, is a ‘one and done’ experience,” Molner said.
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Couric said she finally began feeling “like herself” again around 9 p.m. and went to sleep at 2 a.m.
As TGA leaves a “permanent gap in memory” for the duration of the episode and for hours beforehand, Couric said that from around noon on that day until at least 7 p.m. will remain a “big, black hole.”
As TGA leaves a “permanent gap in memory” for the duration of the episode and for hours beforehand, Couric said that from around noon on that day until at least 7 p.m. will remain a “big, black hole.” (Getty Images)
Data shows that approximately three to eight people per 100,000 will have an episode of transient global amnesia, with people 50 years of age and older at higher risk.
The specific cause of TGA is not known, but some experts believe it stems from a “temporary dysfunction in the brain’s hippocampus — the area responsible for creating new memories,” Couric shared.
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“Doctors believe this is driven by brief interruptions in blood or oxygen flow, or microscopic spasm in the blood vessels.”
Episodes could potentially be triggered by intense physical exertion, emotional distress, extreme temperature changes or migraines, experts say.
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Approximately 15% of patients will have a recurrence 10 years later.
“Why did this happen to me? Was the altitude an issue? Was I dehydrated? Tired? Stressed? The literature doesn’t seem to indicate that these are contributing factors, but the cause seems to be as mysterious as the brain itself,” Couric wrote.
Anyone who experiences sudden memory loss, confusion, difficulty speaking, weakness, numbness, vision changes, severe headache or other stroke-like symptoms should seek immediate medical attention or call 911, doctors advise. (iStock)
“All I know is that those hours will be forever lost. Someone described it as my brain failing to hit the ‘record button.’”
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“While this was a freaky occurrence, it could have been much more serious. So ultimately, I’m relieved — even though several hours of a Saturday in June will always be missing for me.”
Anyone who experiences sudden memory loss, confusion, difficulty speaking, weakness, numbness, vision changes, severe headache or other stroke-like symptoms should seek immediate medical attention or call 911, doctors advise.
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Older adults identified as “super movers” are about half as likely to develop cognitive impairment than their peers.
That’s according to a recent study led by Stony Brook Medicine in New York, which evaluated the cognitive function of 4,000 adults 80 and over who participated in multiple aging and longevity studies over several years.
Among this group, 6% to 10% were classified as super movers, which means they walk at a much faster pace than others of the same age and gender — at speeds comparable to people three decades younger.
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The super movers were found to have about half the risk of cognitive decline compared to seniors with typical gait speed.
The findings were published in the journal Neurology on June 16.
Older adults identified as “super movers” are about half as likely to develop cognitive impairment than their peers. (iStock)
“The study reinforces that mobility and brain health are closely connected,” lead study author Dr. Joe Verghese, MD, neurologist at Stony Brook Medicine, told Fox News Digital. “This suggests that preserving mobility may be an important marker of healthy brain aging and resilience.”
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The most intriguing finding, according to Verghese, was that super movers maintained cognitive function despite having similar dementia-related brain changes as their peers.
In postmortem brain analysis, there was no difference in dementia-related pathologies between the super movers and the slower walkers, the study stated.
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“This suggests they may possess resilience mechanisms that help preserve brain function even in the presence of age-related changes,” he said. “Understanding these resilience factors could lead to new strategies for promoting healthy brain aging.”
As the study was observational, there were some limitations, and it does not prove that walking faster prevents dementia, the researchers noted.
Super movers were found to have about half the risk of cognitive decline compared to seniors with typical gait speed. (iStock)
“Other factors, such as cardiovascular health, physical fitness or genetics, may also contribute to both faster walking and better cognitive outcomes,” Verghese said.
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This study adds to growing evidence that what’s good for the heart and muscles also benefits the brain, he noted, adding that “staying physically active remains one of the most effective, evidence-based ways to support healthy aging.”
“Walking speed is best viewed as a marker of overall health, not a treatment.”
“The broader message is that physical activity is important at any age,” Verghese said. “Walking is an easy step-up point because you don’t need any special equipment. You can do it inside or outdoors, and you can do it on a regular basis. You can walk with a dog, you can walk with a friend.”
Any activity is beneficial if it’s done regularly and with the right intensity, he added.
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Rather than just trying to walk faster, the neurologist recommends that seniors focus on maintaining mobility through regular physical activity, strength training, balance exercises and good cardiovascular health.
“Walking speed is best viewed as a marker of overall health, not a treatment,” Verghese noted.
Major public health guidelines from the CDC and U.S. Physical Activity Guidelines recommend at least 150 minutes of moderate-intensity aerobic activity each week, such as brisk walking.
Major public health guidelines from the CDC and U.S. Physical Activity Guidelines recommend at least 150 minutes of moderate-intensity aerobic activity each week, such as brisk walking. (iStock)
This can be achieved by walking 30 minutes a day, five days a week, or about 20 to 25 minutes most days. Another option is to engage in shorter sessions that add up over the day.
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“You have to do it within your health limitations and medical conditions,” Verghese advised. “So if there are any medical concerns, I would get your physician to clear you before starting exercise.” The good thing about walking, he added, is that you can start at a slow pace and then gradually build up to a brisker pace.
“And then adding on strength and balance training, whatever age you are, I think is also important.”
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