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Dementia risk rises with exposure to wildfire smoke, per Alzheimer’s Association: 'Real problem'

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Dementia risk rises with exposure to wildfire smoke, per Alzheimer’s Association: 'Real problem'

Exposure to wildfire smoke could increase the risk of dementia, researchers have discovered.

A 10-year study of more than 1.2 million people in southern California — an area experiencing frequent wildfire activity — found that wildfire smoke can be “particularly hazardous” for brain health.

The Alzheimer’s Association announced the findings during the Alzheimer’s Association International Conference in Philadelphia on Monday.

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The study found that wildfire smoke increases dementia risk more than other types of air pollution, including emissions from motor vehicles and factories called fine particle matter (PM2.5), according to a press release from the Alzheimer’s Association.

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A 10-year study of more than 1.2 million people in southern California — an area experiencing frequent wildfire activity — found that wildfire smoke can be “particularly hazardous” for brain health. (iStock)

The microscopic droplets in wildfire smoke were found to have a “notably stronger” effect on dementia risk with even less exposure, the researchers found.

High levels of PM2.5 also have been linked to a higher risk of heart disease, asthma and low birth weight.

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The study analyzed data from Californians age 60 years or older between 2009 and 2019, determining the participants’ exposure according to where they lived.

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The researchers observed a 21% increase in the likelihood of dementia diagnosis for every 1 microgram increase of PM2.5 per meter.

Researchers analyzed the health records of 1,227,241 southern Californians, none of whom had been diagnosed with dementia at the start of the study. (iStock)

Dr. Claire Sexton, senior director of scientific programs and outreach for the Alzheimer’s Association, told Fox News Digital that exposure to air pollution is known to be bad for brain health, as previous reports have linked PM2.5 to dementia.

“Each year, approximately 44 million people are exposed to unhealthy air quality due to wildfires worldwide.”

Improving air quality could help to protect cognitive function and reduce dementia risk, according to Sexton. 

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“Each year, approximately 44 million people are exposed to unhealthy air quality due to wildfires worldwide,” she said. “Wildfires are increasing around the globe in frequency, severity and duration.”

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This new study highlighted several reasons that wildfire smoke is more dangerous, Sexton said.

Wildfire smoke is produced at higher temperatures and contains a greater concentration of toxic chemicals compared to other forms of air pollution, she noted.

Trees burn during the Park Fire near Chico, California, on July 26, 2024. (Benjamin Fanjoy/Bloomberg via Getty Images)

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Wildfire smoke also produces a smaller diameter of PM2.5 than other sources, Sexton added.

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“With the rising global incidence of wildfires — including current wildfires in California, Oregon, Alaska and the southwestern U.S. — exposure to wildfire smoke is an increasing threat to brain health.”

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Research shows that on “poor air quality days” in California, air pollution produced by wildfires accounts for more than 70% of total fine particulate exposure, according to Sexton.

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A firefighter watches a prescribed burn as the Max Fire burns in Lancaster, California, June 16, 2024. (DAVID SWANSON/AFP via Getty Images)

“This is a real problem,” she said. 

To lower the risk of exposure, Sexton recommends that people update their home air filtration systems and stay inside during periods of unhealthy air quality.

Researchers also suggest wearing an N95 mask outdoors when the Air Quality Index is over 100.

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How much red meat is too much? Experts weigh in on food pyramid updates

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How much red meat is too much? Experts weigh in on food pyramid updates

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The release of an updated food pyramid this week has sparked mixed reactions from doctors and dietitians.

One of the most noteworthy shifts in the 2025-2030 Dietary Guidelines for Americans — announced by HHS officials during a Jan. 7 press conference at the White House — is a greater emphasis on “high-quality proteins,” including red meat and eggs, as well as full-fat dairy.

The new guidelines focus on “real, whole, nutrient-dense foods,” and a dramatic reduction in highly processed foods, added sugars, refined carbohydrates and unhealthy fats.

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“Protein and healthy fats are essential and were wrongly discouraged in prior dietary guidelines,” Health Secretary Robert F. Kennedy Jr. said during the press conference. “We are ending the war on saturated fats.”

Nick Norwitz, a Harvard- and Oxford-trained researcher known for his work in metabolic health, shared his reaction to the new guidelines.

The release of an updated food pyramid this week has sparked mixed reactions from doctors and dietitians. (realfood.gov)

Despite how the new pyramid is presented, he noted, the actual guidelines for saturated fat consumption haven’t changed, as they still state that, “in general, saturated fat consumption should not exceed 10% of total daily calories.”

The intake of unprocessed whole foods rich in saturated fat, especially dairy fat, tends to be associated with improved health outcomes, according to Norwitz.

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“Full-fat dairy — especially cheese, for example — tends to be associated with lower BMI, reduced rates of diabetes and even reduced dementia risk,” he told Fox News Digital. “There are, of course, nuances — but ‘ending the war’ on saturated fat seems reasonable.”

Risks vary, experts say

Experts cautioned about the potential health risks of exceeding the recommended intake of saturated fat, including higher rates of LDL “bad” cholesterol, which is known to increase the risk of cardiovascular disease.

“The recommendation to limit saturated fat to 10% of total calories is based on the research showing that higher rates increase LDL cholesterol and associated risks for cardiovascular disease,” Sherry Coleman Collins, a food allergy dietitian and expert from the Atlanta metropolitan area, told Fox News Digital. 

One of the most noteworthy shifts in the 2025-2030 Dietary Guidelines for Americans is a greater emphasis on “high-quality proteins” — including red meat and eggs — as well as full-fat dairy. (iStock)

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Nutrition should be personalized and is dependent on multiple factors, she said, including age, gender, activity level and genetic risk factors.

“The total saturated fat an individual might safely consume is influenced by their size and total calorie needs, as well as potentially genetic differences,” Coleman Collins said.

Norwitz agreed, adding that “the specific food source and interaction with the unique host and their broader dietary context should take the spotlight.”

Dr. Pooja Gidwani, a double board-certified doctor of internal medicine and obesity medicine in Los Angeles, pointed out that not everyone has the same “tolerance” for saturated fats.

“If increasing saturated fat leads to a meaningful rise in LDL cholesterol or ApoB (Apolipoprotein B, a protein found on the surface of certain cholesterol-carrying particles in the blood), that intake level is excessive for that individual, regardless of improvements in weight or glucose metrics,” she said.

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“This personalized approach becomes increasingly important in midlife and beyond, when cardiovascular disease becomes the dominant driver of morbidity and mortality and when tolerance for cumulative atherogenic (artery-clogging) exposure is lower.”

For those who need to reduce LDL cholesterol or have a higher cardiovascular risk, the American Heart Association recommends an even lower amount of saturated fats — less than 6% of total daily calories.

Experts cautioned about the potential health risks of exceeding the recommended intake of saturated fat, including higher rates of LDL “bad” cholesterol. (iStock)

Gidwani also cautioned that diets emphasizing saturated fat could crowd out fiber and unsaturated fats, “both of which play independent roles in cholesterol clearance, insulin sensitivity, gut health and inflammation.”

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“Saturated fat-heavy patterns are also calorie-dense, which can quietly undermine long-term weight management if intake is not carefully regulated,” she added.

Not all saturated fats are equal, experts say

The effects of saturated fat depend on what specific foods are being consumed, according to experts.

“I would recommend choosing minimally processed or unprocessed forms of foods,” said Tanya Freirich, a registered dietitian nutritionist in Charlotte, North Carolina. “For example, in place of a hot dog — which has additives, nitrites, sodium and fillers — consuming a chicken thigh would be a much better choice.”

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Gidwani reiterated that the amount of processing plays a big role.

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“Processed meats are consistently associated with worse cardiometabolic outcomes and represent the clearest category to limit,” she said. “The risk here is not only saturated fat, but also sodium load, preservatives and the broader dietary pattern they tend to accompany.”

“Full-fat dairy — especially cheese, for example — tends to be associated with lower BMI, reduced rates of diabetes and even reduced dementia risk,” an expert told Fox News Digital. (iStock)

Unprocessed red meat, the doctor said, can fit into an overall healthy diet in smaller amounts, particularly when consumed alongside fiber-rich plants and minimally processed foods.

“However, from a longevity perspective, it should be viewed as optional rather than foundational, especially for individuals with elevated cardiovascular risk,” she added.

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When it comes to dairy, Gidwani noted that fermented options are “metabolically more favorable” than butter or cream.

“However, saturated fat from dairy is still not necessary to prioritize for metabolic health or longevity,” she said. “Excessive reliance on dairy fat can displace healthier fat sources without offering clear long-term benefit.”

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Overall, the doctor recommends unsaturated fat sources, including extra virgin olive oil, nuts, seeds, avocado and omega-3-rich fish, as primary dietary fats.

“These consistently support lipid profiles, insulin sensitivity and vascular health,” Gidwani said. “Saturated fat can exist within a balanced diet, but it should remain secondary rather than emphasized.”

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Why the big picture matters

Saturated fat is just one piece of a much wider nutrition puzzle, the experts agreed.

Unprocessed red meat can fit into an overall healthy diet in smaller amounts, particularly when consumed alongside fiber-rich plants and minimally processed foods, one expert said. (iStock)

“Our heart health is not determined by one type of fat or one type of cholesterol, but the sum of many parts — our entire diet, our exercise habits, our stress and so much more,” Freirich said.

She recommends consulting a registered dietitian for guidance on unique dietary needs based on age, gender, activity level and medical history.

“Our heart health is not determined by one type of fat or one type of cholesterol, but the sum of many parts — our entire diet, our exercise habits, our stress and so much more,” said an expert.  (iStock)

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New Jersey-based dietitian Erin Palinski-Wade, author of “2-Day Diabetes Diet,” added that the message should be to focus more on overall patterns.

That means “plenty of fiber-rich plants, lean protein at every meal (including those that also contain fiber, such as nuts and seeds) and a reduction in overall intake of added sugars.”

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“That change will drive true health improvements,” she said.

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The Wegovy Pill Is Here: See the Cost and How Much Weight You Can Lose

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The Wegovy Pill Is Here: See the Cost and How Much Weight You Can Lose


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No Shots Required! Doctors Say the New $25 a Month Wegovy Pill Works | Woman’s World




















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Missing sleep may take a hidden toll on your brain and longevity, research reveals

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Missing sleep may take a hidden toll on your brain and longevity, research reveals

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Missing out on adequate sleep could be taking years off your life.

New research from the Oregon Health & Science University (OHSU), published in the journal Sleep Advances, found that poor sleep may shorten life expectancy more than other lifestyle factors like diet, exercise and loneliness.

The researchers analyzed nationwide CDC survey data, identifying trends associated with average life expectancy by county, according to a press release.

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The study found that lack of adequate sleep led to higher mortality risk in every U.S. state and was the top behavioral driver compared to other factors, only behind smoking.

Senior study author Andrew McHill, Ph.D., associate professor and director of the Sleep, Chronobiology, and Health Laboratory in the OHSU School of Nursing, noted in a statement that he did not expect sleep to be “so strongly correlated” to life expectancy.

Poor sleep is directly correlated with shorter life expectancy, the study reveals. (iStock)

“We’ve always thought sleep is important, but this research really drives that point home: People really should strive to get seven to nine hours of sleep, if at all possible,” he said.

“This research shows that we need to prioritize sleep at least as much as we do [in] what we eat or how we exercise.”

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In a previous interview with Fox News Digital, Dr. Daniel Amen, psychiatrist and owner of Amen Clinics in California, emphasized how important sleep is for brain function and longevity.

Researchers suggest people should prioritize sleep just as much as diet and exercise. (iStock)

“Sleep is so important,” he said. “When you sleep, your brain cleans and washes itself. And if you don’t sleep seven to nine hours at night, your brain looks older than you are — there’s less blood flow, and it increases inflammation in the brain.”

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“Your brain doesn’t have enough time to get rid of the toxins that build up during the day.”

Lack of adequate sleep can lead to poor decisions and foster toxic cycles, the doctor warned. 

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“If your brain has less activity in the front part, not only are you tired, but you’re also hungrier, and you’re more likely to not make the best decisions,” he said. 

“Which, of course, will stress you out, and then you won’t sleep well the next night.”

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A doctor suggests being “purposeful” about going to bed and waking up each day. (iStock)

One small change to promote longevity and brain health is to try getting to bed 15 minutes earlier, Amen suggested.

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“Really be purposeful about not being distracted by Netflix or your phone,” he said.

“And when you get up in the morning, say to yourself, ‘Today is going to be a great day.’ The more positive you are, the better your brain.”

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