4 tips to get a better night’s sleep during sweltering summer temperatures

Sleeping during the hot summer months can be a struggle for some.

It’s necessary for the body to cool down for optimal rest — so what’s the best way to harness a good night’s sleep during periods of extreme heat?

Dr. Michael Gradisar, head of sleep science at the sleep app Sleep Cycle in Australia, shared some tips with Fox News Digital.

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The body naturally releases heat from the hands, feet and face when preparing for sleep, according to the expert.

When the environment is too warm, the body cannot shed heat effectively, making it more difficult to fall and stay asleep.

"Overheating during the night also disrupts sleep, in the form of more frequent awakenings, night sweats and/or reduced sleep quality," Gradisar said.

"And for those already prone to rumination or insomnia, high nighttime temperatures act as an added stressor, making it even more likely they'll wake up and struggle to drift off again." 

This can result in fragmented sleep and groggy mornings, he warned.

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To increase sleep quality despite the heat, Gradisar offered the following guidance.

To keep the room well-regulated for sleep, Gradisar suggested opening the windows early in the evening to let in cooler air and closing them before bedtime to reduce noise.

"Keep your bedroom cool, dark and quiet," he advised.

Using a fan or air conditioning to circulate air will also support heat transfer from your body and help prevent night sweats, according to Gradisar.

While drinking water is great for internal hydration on hot nights, Gradisar also suggested taking a cool shower or bath — or going for an evening swim — before bed.

Immersing yourself in cool water will help lower the body’s core temperature, he said.

If your bedding gets too warm, the expert suggested removing your blanket for 30 to 60 seconds, then re-covering once cooled.

When sleeping with a partner, sharing the same duvet or blanket means also sharing each other’s body heat.

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Gradisar recommended considering the Scandinavian sleep method, in which a couple uses separate duvets to avoid sharing too much heat.

The expert also urged caution when using cooling blankets, as the "scientific evidence of their effectiveness is small."

Wearing breathable pajamas and using natural, "heat-wicking" bedding will help keep you cooler, he said.

Drinking even moderate amounts of alcohol before bed increases the likelihood of waking up during the night, according to Gradisar.

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Alcohol intake also speeds up the heart rate and widens blood vessels, bringing an initial warmth to the skin, and impairs the body’s ability to regulate temperature, research has shown.

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Controversial seed oils may offer unexpected health benefits, new research shows

Amid MAHA-inspired efforts to reduce ultraprocessed food consumption, seed oils have come under tough scrutiny in recent months — but a new study suggests they may not be all bad.

Researchers from the Indiana University School of Public Health-Bloomington found that linoleic acid — a common omega-6 fatty acid found in a variety of seed oils — could help reduce the risk of heart disease and type 2 diabetes.

Linoleic acid is found in seed oils such as soybean and corn oil, as well as plant foods, according to a press release from the American Society for Nutrition.

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"There has been increasing attention on seed oils, with some claiming these oils promote inflammation and raise cardiometabolic risk," said Kevin C. Maki, Ph.D., adjunct professor at the Indiana University School of Public Health-Bloomington and chief scientist at Midwest Biomedical Research, in the release. 

"Our study, based on almost 1,900 people, found that higher linoleic acid in blood plasma was associated with lower levels of biomarkers of cardiometabolic risk, including those related to inflammation." 

While previous studies have explored the link between linoleic acid and cardiovascular risk factors, this latest research used "objective biomarkers" instead of relying on participants’ self-reported dietary habits, according to Maki.

"We also measured a range of markers of inflammation and indicators of glucose metabolism," he noted.

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People with higher levels of linoleic acid were found to have lower levels of glucose, insulin and markers of inflammation, the researchers found.

"We saw consistent results across the different biomarkers measured," Maki said. "People with higher levels of linoleic acid in their blood tended to have a healthier overall risk profile for heart disease and diabetes."

The findings were presented at NUTRITION 2025, the flagship annual meeting of the American Society for Nutrition that was held May 31-June 3 in Orlando — although the results were preliminary.

"Abstracts presented at NUTRITION 2025 were evaluated and selected by a committee of experts, but have not generally undergone the same peer review process required for publication in a scientific journal," the release stated. 

"As such, the findings presented should be considered preliminary until a peer-reviewed publication is available."

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Based on the findings, the researchers called for additional study to confirm whether greater intake of linoleic acid intake reduces the chances of heart attacks, stroke and type 2 diabetes, the release stated.

The team also aims to determine the impact of specific types of oils.

Michelle Routhenstein, a New York-based registered dietitian who specializes in heart disease, was not involved in the study but shared reaction to the findings.

"As a cardiovascular dietitian, I think this study reinforces what evidence has long suggested: Seed oils are not harmful — in fact, they may be protective of cardiometabolic health," she told Fox News Digital. 

"By using blood biomarkers, the research shows that higher linoleic acid levels are linked to lower inflammation and better cardiometabolic health."

Routhenstein noted that linoleic acid has been shown to lower LDL cholesterol and support healthy cell membranes.

"It is also associated with lower levels of inflammatory markers like CRP (C-reactive protein)," she said. "These biological effects help explain its cardiometabolic benefits."

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"This study supports including seed oils, used in appropriate amounts, as part of a heart-healthy diet."

In a Dec. 2024 study published in the medical journal Gut, the plant-based cooking oils — which are often used in processed, packaged foods — were linked to an increased risk of colon cancer, although dietitians pointed to limitations.

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Meanwhile, California chef and restaurant owner Andrew Gruel has shared his staunch opposition to seed oils in interviews with Fox News Digital, saying the "switch away from seed oils shows this movement is here to stay."

"People have researched the effects of seed oils, tried the alternatives and are now demanding their favorite brands make the switch," Gruel said.

Sherry Coleman Collins, a food allergy dietitian and expert from the Atlanta metropolitan area, suggested the cautions about seed oils may be exaggerated, but did recommend choosing wisely.

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In terms of cooking oils, Collins recommended using olive oil, noting there’s a "significant body of evidence" for its use as part of a Mediterranean approach to eating.

"Extra-virgin olive oil can be a wonderful, versatile oil to use in low-medium heat cooking. It tastes great and has a very good fatty acid profile," she previously told Fox News Digital. 

"For higher-heat cooking, I like avocado and peanut oils for their high smoke point and neutral flavor, and they, too, have good fatty acid profiles." 

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Fox News Digital reached out to the Indiana University researchers for comment.

Peter Burke of Fox News Digital contributed reporting.

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Ancient 'pharaoh's curse' fungus shows promise in killing cancer cells

A potentially deadly fungus known as "pharaoh's curse fungus" could offer an unexpected path to fighting cancer, recent research shows.

Scientists from the University of Pennsylvania modified molecules from the fungus — which is officially called Aspergillus flavus — to create a new compound and enhance its cancer-killing properties.

"Fungi gave us penicillin," said Dr. Xue (Sherry) Gao, an associate professor at UPenn and leader of the study, in a press release. "These results show that many more medicines derived from natural products remain to be found."

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The findings were published in the journal Nature Chemical Biology.

Aspergillus flavus is found in decaying leaves and compost, as well as on trees, plants and some crops, according to Mayo Clinic.

While the fungus doesn't endanger most healthy people, it can cause respiratory issues for those who have weakened immune systems or are taking certain medications.

Some of the more severe complications of the fungus can include bleeding in the lungs and life-threatening infections in the brain, heart and kidneys, Mayo Clinic stated.

After archaeologists opened King Tut’s tomb in the 1920s, multiple members of the excavation team died suddenly, fueling rumors of a "curse" upon those who dared interfere with the pharaoh’s rest, according to the UPenn press release.

Decades later, doctors hypothesized that fungal spores, which had been dormant for thousands of years, could have infected the team.

In the 1970s, it happened again, the university stated. 

A dozen scientists entered another tomb, this time in Poland — and 10 died within a few weeks. Later investigations were said to reveal the presence of Aspergillus flavus in the tomb.

Now, the same fungus linked to King Tut's tomb could have the capability to fight leukemia in a new form of cancer therapy.

"There are a variety of compounds able to be produced by fungus," Gao told Fox News Digital.

These compounds can be toxic to different cells, she noted, depending on the "biological management we are able to mitigate."

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The study aimed to find a specific kind of compound — ribosomally synthesized and post-translationally modified peptides, or "RiPPs" — within Aspergillus flavus, which was previously shown to be a good source.

When this compound is able to enter cancer cells, Gao said, it may be able to stop their growth.

"Cancer cells divide uncontrollably," Gao said in the release. "These compounds block the formation of microtubules, which are essential for cell division."

When mixed with human cancer cells, two variants of the molecules within these RiPPS were found to have potent effects against leukemia cells, the researchers found.

Another variant performed as well as two FDA-approved drugs that have been used for decades to treat leukemia (cytarabine and daunorubicin).

Tiffany Troso-Sandoval, M.D., a medical oncologist and cancer care consultant based in New York, cautioned that this study, which was performed on cell cultures, is still in the very early stages.

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"It's still very far away from being applicable to use in humans with leukemia," Troso-Sandoval, who was not involved in the study, told Fox News Digital.

Speaking about RiPPs, the doctor told Fox News Digital, "What they're referring to [in the study] is basically a rare type of bioactive molecule that they have isolated from this fungus."

There are multiple subtypes of leukemia, Troso-Sandoval pointed out, including acute and chronic forms.

"One treatment might not work on [another] type of leukemia," she noted. Further testing is needed to determine which subtypes may contain the active molecule.

The compound explored in the study had little to no effect on breast, liver or lung cancer cells, the researchers noted.

This suggests that its disruptive effects only work on certain types of cells, which will be an important consideration when developing medications.

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Looking ahead, the researchers plan to test the fungus' potential in animal models and, ultimately, human trials.

Gao told Fox News Digital she is "excited about what nature can create and how it can benefit our society."

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The study received support from the National Institutes of Health, the University of Pennsylvania, the Welch Foundation, the Houston Area Molecular Biophysics Program, the Cancer Prevention and Research Institute of Texas and the National Science Foundation.

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Billionaire's death after swallowing bee raises questions about rare cardiac reaction

On June 12, a prominent billionaire from India, Sunjay Kapur, died suddenly at the age of 53 in Windsor, England, according to multiple reports.

Kapur was the chairman of Sona Comstar, an Indian automotive components manufacturer.

His close friend, business consultant Suhel Seth, confirmed Kapur's death in a post on X that same day.

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"Deeply saddened at the passing of @sunjaykapur: he passed away earlier today in England: a terrible loss and deepest condolences to his family and to his colleagues @sonacomstar …Om Shanti," Seth wrote.

In the following days, it was revealed that Kapur died while playing polo. Multiple outlets reported that he collapsed after swallowing a bee mid-match, potentially triggering a fatal heart attack.

No official source for the billionaire confirmed that a bee caused the heart attack. Fox News Digital reached out to Sona Comstar for comment.

"It’s not possible to comment with any specificity about this particular case without a thorough review of the forensics," Dr. Nishant Kalra, an Ohio cardiologist and regional chief medical officer at VitalSolution — an Ingenovis Health company that offers cardiovascular and anesthesiology services to hospitals — told Fox News Digital.

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Swallowing a bee can, in very rare cases, precipitate a heart attack, he confirmed — "but only through specific mechanisms."

The primary risk is not from the act of swallowing itself, but from the possibility of a bee sting to either the upper airway or the oropharynx (the part of the mouth that includes the back of the tongue, tonsils and soft palate), which can introduce venom into the body, according to Kalra.

If the individual is allergic, this can trigger anaphylaxis, which may cause "profound hypotension, arrhythmias or even acute coronary syndromes," Kalra said — a phenomenon known as Kounis syndrome. 

This syndrome can result from a coronary event (any adverse medical event related to the coronary arteries, which supply blood to the heart) occurring in combination with anaphylactic or allergic reactions. 

This can pose a risk even to individuals who do not have pre-existing coronary artery disease. 

The American Academy of Allergy, Asthma & Immunology notes that cardiac anaphylaxis can cause reduced blood flow to the heart (myocardial ischemia) and irregular heartbeats (arrhythmias) when triggered by an allergy to insect venom.

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However, these cases are incredibly rare, according to experts.

"The general population should not be concerned about this as a common risk," Kapur told Fox News Digital. "Fatal cardiac events following bee stings are rare and typically occur in individuals with known venom hypersensitivity or underlying cardiac disease."

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Most bee stings, even in the oropharynx, result in local reactions, though airway compromise is a concern if significant swelling occurs, he added.

Those who experience allergic symptoms following a sting should seek immediate medical attention.

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Body fat predicts major health risk that BMI misses, researchers say

Body mass index (BMI) may not be the most accurate predictor of death risk.

A new study from the University of Florida found that BMI — a measurement that is commonly used to determine whether a person’s weight is in a healthy range for their height — is "deeply flawed" in terms of predicting mortality.

Instead, one’s level of body fat is "far more accurate," concluded the study, which was published this week in the Annals of Family Medicine.

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To measure participants’ body fat, the researchers used a method called bioelectrical impedance analysis (BIA), which uses a device to measure the resistance of body tissue to a small electrical current.

Over a 15-year period, those who had high body fat were found to be 78% more likely to die than those who had healthy body fat levels, researchers found.

They were also more than three times as likely to die of heart disease, the study noted. 

BMI — which is calculated by dividing weight by height, squared — was described as "entirely unreliable" in predicting the risk of death over a 15-year period from any cause.

The study included 4,252 people in the U.S. and pulled data from the National Health and Nutrition Examination Survey.

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BMI should not be relied upon as a "vital sign" of health, according to senior author Frank Orlando, M.D., medical director of UF Health Family Medicine in Springhill.

"I’m a family physician, and on a regular basis, we’re faced with patients who have diabetes, heart disease, obesity and other conditions that are related to obesity," Orlando said in a press release for the study.

"One of the routine measures we take alongside traditional vital signs is BMI. We use BMI to screen for a person having an issue with their body composition, but it’s not as accurate for everyone as vital signs are," he added.

BMI has been the international standard for measuring obesity since the 1980s, according to many sources, though some experts have questioned its validity. 

An individual is considered obese if their BMI is 30 or above, overweight if it is between 25 and 29.9, of "normal" weight in the range of 18.5 to 24.9, or underweight if lower than 18.5.

While BMI is easy to calculate, one of its main limitations is that it cannot distinguish between muscle and fat mass, the researchers noted.

"For example, people who are bodybuilders can really elevate their body mass index," Orlando said. "But they’re healthy even with a BMI indicating that they’re obese."

"BMI is just so ingrained in how we think about body fat," Mainous added. "I think the study shows it’s time to go to an alternative that is now proven to be far better at the job."

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Other methods, such as a DEXA (dual-energy X-ray absorptiometry) scan, may be even more accurate than BIA, but are much more expensive and not as accessible, the researchers noted.

"If you talk to obesity researchers, they’re going to say you have to use the DEXA scan because it’s the most accurate," Mainous said in the release. "And that’s probably true. But it’s never going to be viable in a doctor’s office or family practice."

Dr. Stephen Vogel — a family medicine physician with PlushCare, a virtual health platform with primary care, therapy and weight management options — echoed the limitations of BMI.

"It has been an easy measurement tool that helps us understand at-risk groups across various populations and demographics, but it doesn't provide accurate data from patient to patient," the North Carolina-based doctor, who was not involved in the study, told Fox News Digital.

"These findings don't challenge the assumptions about BMI — they strengthen the message that new standards, delivered in a consistent and low-cost way, would provide better nuance for the individual when it comes to their overall physical health."

"The main strengths of this study are a better correlation to an individual's risk of morbidity and mortality — however, the limitations lie in the fact that we don't have enough data to determine the right cutoff for these numbers, or to identify the right tools that will be both accurate and precise across the population," Vogel said.

The researchers also acknowledged that body fat percentage thresholds haven’t yet been as standardized as BMI and waist circumference.

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Also, the age range of the participants in the study was limited by the data source.

"Future studies should extend this comparison of body fat to BMI in older adults," the researchers wrote.

The study was also limited by focusing only on mortality as an outcome, they noted, without taking into account any developing diseases — such as heart failure or cancer — that could deepen the understanding of body fat as a risk factor. 

The goal, according to Vogel, is to have a cost-effective, consistent method that can be used across the population with reliable accuracy.

"Benefits would come in the form of a more detailed list of information that helps providers and patients make informed decisions about the patient’s health, which is ideal," Vogel noted.

"I'm hopeful there's enough buzz around these measures that steps will continue to be taken toward regular implementation."

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The researchers are hopeful that once standards are validated, measuring body fat percentage with bioelectrical impedance analysis could become standard of care. 

They added, "These data will drive better discussions in the doctor’s office, as well as public health initiatives with the goal of improving the health of all."

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Extreme heat affects the brain — here's how to protect your cognitive health

Summer heat has swept the U.S., with warnings issued across the East Coast and Midwest.

In addition to putting stress on the body, hot weather can also take a toll on the brain and mental health.

Dr. Jace Reed, director of emergency psychiatry at Cedars-Sinai Hospital in Los Angeles, emphasized in an interview with Fox News Digital that the brain is a major organ that can be greatly affected by heat.

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Extreme heat can cause mental health changes like increased irritability and anxiety, along with decreased memory, attention and reaction time.

This can affect daily interactions socially and professionally, the expert cautioned.

"You may be slower at completing your task or remembering what someone just told you," he told Fox News Digital. "Those can be initial early signs that the heat is affecting your brain and your mental abilities."

Symptoms like extreme confusion could mark the beginning of a heat stroke, which could require hospitalization, the psychiatrist warned.

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In a separate interview with Fox News Digital, Thea Gallagher, a doctor of psychology and director of wellness programs at NYU Langone Health, noted that when the body overheats, it struggles to regulate internal balance.

This can lead to disrupted sleep, fatigue and poor concentration, as well as impaired cognitive function, slow reaction times and struggles with decision-making.

The heat can also increase oxidative stress and inflammation in the brain, Gallagher added, which can potentially damage neurons, worsen existing neurological conditions and raise stroke risk.

"Heat exposure may trigger an inflammatory response in the brain," she said. "In cases like heatstroke, inflammation is believed to contribute to symptoms such as confusion and delirium."

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Excessive heat can also weaken the protective blood-brain barrier, according to the expert, which makes the brain more vulnerable to toxins and pathogens.

Higher temperatures are also associated with disturbances in mood and violent behavior, especially during prolonged heatwaves.

Psychiatric emergency visits for anxiety, depression and substance use also rise significantly on the hottest days, Gallagher confirmed.

Below are some of the main mental symptoms that can worsen in hot weather, experts cautioned.

People who suffer from mental health conditions such as mood disorders, schizophrenia, anxiety or even dementia are more vulnerable in hot weather.

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Some psychiatric medications could make it difficult for the body to regulate temperature or stay hydrated, Gallagher noted, while heat can "intensify" symptoms like agitation or paranoia.

"People with cognitive impairments may not recognize the signs of overheating," she added.

"Some SSRIs (selective serotonin reuptake inhibitors) can suppress sweat production, which is the body’s primary cooling mechanism. This raises the risk of overheating, dehydration and even heat stroke."

"Paradoxically, SSRIs can also cause excessive sweating in some individuals — a side effect known as ‘SSRI sweats,’" she went on. "While this might seem like it would help with cooling, it can actually lead to dehydration if fluid intake doesn’t keep up."

The experts recommended the following practices to protect brain health in extreme heat.

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"Days are also longer and there are more activities, which can be exhausting," Gallagher noted. "Therefore, it is good to prioritize sleep and rest … and [find] ways to slow down when you can."

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CDC committee moves to phase out controversial mercury ingredient from flu vaccines

A vaccine ingredient is in the spotlight this week, as a preservative called thimerosal was included on the agenda for a meeting of the CDC’s Advisory Committee on Immunization Practices (ACIP).

"Presentation regarding thimerosal in vaccines" was listed as an agenda item for Thursday, June 26, followed by "Proposed recommendations regarding thimerosal-containing influenza vaccine."

Thimerosal (also spelled thiomersal) is a mercury‑based preservative that has been used in multi-dose vaccines and medications since the 1930s as a means of preventing contamination, according to the CDC.

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The ingredient is intended to prevent contamination by stopping the growth of bacteria and fungi, the same source states.

Due to growing concerns about potential mercury exposure, the American Academy of Pediatrics, Public Health Service agencies and vaccine manufacturers agreed that thimerosal should be "reduced or eliminated in vaccines."

In 2001, thimerosal was removed from all vaccines recommended for children 6 and younger — except for influenza.

Today, multi-dose flu vaccines still contain thimerosal, but other versions are available without the ingredient.

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At the June 27 meeting, the CDC’s Advisory Committee on Immunization Practices voted to recommend that all adults (including pregnant women) and all children 18 years and younger should receive seasonal influenza vaccines only in single-dose formulations that do not contain thimerosal, according to meeting notes published by the CDC.

Despite these recommendations, the CDC and other health agencies have claimed there is no evidence that thimerosal poses health risks.

"Thimerosal use in medical products has a record of being very safe," the agency’s website states. "Data from many studies show no evidence of harm caused by the low doses of thimerosal in vaccines."

Dr. Jacob Glanville, CEO of Centivax, a San Francisco biotechnology company, reiterated that American children have not been receiving thimerosal for over 20 years in their vaccines, but that it remains in some multi-use vial vaccines, mostly outside the U.S.

"We support any effort to remove it entirely — there are other preservatives that are not based on mercury," Glanville told Fox News Digital. 

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Glanville noted that his company’s vaccines never contain mercury, aluminum, formaldehyde, or pig- or cow-derived materials.

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