Health
Men’s brains shrink faster than women’s; researchers explore Alzheimer’s connection
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A new study may challenge what we thought we knew about brain aging.
Scientists have discovered that men’s brains shrink faster than women’s as they grow older, even though women are more likely to develop Alzheimer’s disease.
The research, published in the Proceedings of the National Academy of Sciences, analyzed more than 12,000 brain scans from nearly 5,000 healthy people between the ages of 17 and 95. Each participant had at least two MRI scans taken over time, allowing scientists to gauge how their brains changed as they aged.
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Researcher Anne Ravndal of the University of Oslo in Norway said her team wanted to test whether the higher Alzheimer’s rate in women could be linked to gender differences in the brain.
“Women are diagnosed with Alzheimer’s disease more often than men, and since aging is the main risk factor, we wanted to test whether men’s and women’s brains change differently with age,” she told Fox News Digital.
A new study shows women’s brains don’t shrink as quickly as men’s in old age, although women still have higher rates of Alzheimer’s diagnoses. (iStock)
Men showed a faster rate of brain shrinkage across more regions than women. Areas related to memory, emotion and sensory processing — like the hippocampus and parahippocampal regions — were especially affected, the study found.
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Women’s brains, by contrast, appeared to maintain their size in more areas, though they did show slightly more enlargement in the brain’s fluid-filled spaces, known as ventricles.
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“Our findings show that men experience greater structural brain decline across more regions, meaning that normal brain aging doesn’t explain the sex difference in Alzheimer’s rates,” Ravndal said.
One hypothesis is that women get more checkups than men and are diagnosed more often with Alzheimer’s. (iStock)
Because women are still diagnosed with the disease nearly twice as often, researchers concluded that brain size changes alone can’t explain that gap.
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“The results instead point toward other possible explanations, such as differences in longevity, diagnostic patterns or biological factors,” said Ravndal.
For example, women tend to live longer, which increases the window of time during which Alzheimer’s can develop. Shifts in estrogen during menopause could also affect how brain cells age, experts say.
One potential reason for the higher rate of Alzheimer’s in women could be changes in estrogen and other hormones as they age. (iStock)
Some researchers have noted that women may simply be diagnosed more often because they’re more likely to seek medical help when memory problems appear.
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One limitation of the study is that it only looked at healthy people, not those who were already showing signs of dementia, Ravndal acknowledged. The participants were also generally well-educated and came from multiple study sites.
Ravndal emphasized that the work isn’t meant to guide individual health decisions.
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“The study is not about making direct recommendations for individuals — rather, it helps refine scientific understanding by showing that normal brain aging does not account for women’s higher prevalence of Alzheimer’s disease,” she said.
The researcher added that “future work needs to identify the mechanisms that do.”
Health
GLP-1 drugs linked to higher fracture risk, osteoporosis and gout, new studies suggest
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GLP-1 medications such as Ozempic and Wegovy have transformed treatment for Type 2 diabetes and obesity, but new research suggests doctors may need to pay closer attention to bone health, especially in older patients taking the drugs.
Older adults with Type 2 diabetes who started GLP-1s had an 11% higher risk of fragility fractures compared to those taking other diabetes medications, a study published in February in the Journal of Clinical Endocrinology & Metabolism found.
Dr. Michal Kasher Meron, an endocrinologist at Meir Medical Center in Israel and lead author of the study, said the relative increase may sound small, but it carries weight for an at-risk population.
“Both older age and Type 2 diabetes are independent risk factors for fragility fractures,” Kasher Meron told Fox News Digital. “This is a population that deserves special attention.”
A new study suggests older adults with Type 2 diabetes taking GLP-1 medications may face increased fracture risk. (iStock)
Fragility fractures are breaks from minor falls or routine activity, often linked to osteoporosis, and can lead to hospitalization, loss of independence and even increased mortality in older adults, Kasher Meron noted.
The study followed more than 46,000 adults 65 and older for nearly three years. After adjustments, GLP-1 users had a modest but statistically significant increase in fracture risk.
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Previous research in younger patients using older GLP-1s did not show increased fracture risk, but newer, more potent versions are now widely prescribed to older adults, Kasher Meron noted.
“In older adults treated with contemporary medications, the fracture risk picture looks different and warrants close attention,” she said.
Separate research found slightly higher rates of osteoporosis and gout among adults using GLP-1s. (iStock)
The study, however, was observational, meaning it shows an association but not causation. Researchers were unable to determine whether the risk was driven by weight loss, changes in diet, muscle loss or a direct effect on bone.
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Nonetheless, Kasher Meron says, “Bone health should be assessed before starting these medications in older patients — not as an afterthought.”
The findings come as separate research presented at the American Academy of Orthopaedic Surgeons’ annual meeting this month raised additional bone health concerns.
In an analysis of more than 146,000 adults with obesity and Type 2 diabetes, GLP-1 users were found to have a 29% higher relative risk of osteoporosis over five years compared to nonusers, according to reports.
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Rates of gout were also slightly higher, affecting 7.4% of GLP-1 users compared to 6.6% of nonusers — about a 12% relative increase.
Experts recommend bone density screening for older adults taking GLP-1 medications. (iStock)
Osteomalacia, a softening of the bones, was rare but occurred about twice as often in GLP-1 users, according to the study, which has not yet been peer reviewed. It was also observational, showing only an association. Fox News Digital has reached out to the researcher for comment.
Several mechanisms could be at play, experts say. GLP-1 medications suppress appetite and can lead to rapid weight loss. Significant weight loss is known to reduce bone density, partly because less mechanical load is placed on the skeleton.
“It’s the same idea as when we always hear about astronauts going up into space, and they’re in a gravity-zero environment for too long,” lead author Dr. John Horneff, an associate professor of orthopedic surgery at the University of Pennsylvania, told NBC News.
“There’s nothing forcing their bones to kind of hold their weight anymore. And a lot of those astronauts come back with low bone density.”
Additionally, eating fewer calories may also mean lower intake of calcium, vitamin D and protein, nutrients critical for bone strength.
GLP-1 medications like Ozempic and Wegovy are widely used to treat Type 2 diabetes and obesity. (iStock)
Rapid weight loss can also temporarily increase uric acid levels, a byproduct of tissue breakdown, which may explain the uptick in gout cases.
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Despite the findings, experts say the results should not discourage appropriate use of GLP-1 medications, which have proven benefits for blood sugar control, weight loss and cardiovascular risk reduction.
In addition to bone density screening, experts say patients should ensure adequate nutrition and resistance training to help preserve muscle and bone during weight loss.
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A spokesperson for Novo Nordisk, which manufactures GLP-1 medications, said the company prioritizes patient safety, works closely with the U.S. Food and Drug Administration (FDA) and welcomes independent research into its products.
Experts also recommend proper nutrition and resistance training to help preserve muscle and bone health during weight loss. (iStock)
The known risks and benefits of the drugs are reflected in the current FDA-approved labeling, Liz Skrbkova, head of U.S. media relations for Novo Nordisk, told Fox News Digital. She emphasized that semaglutide has demonstrated cardiovascular, kidney and liver benefits when used under medical supervision.
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“Osteoporosis is a complex condition that develops over many years as a result of interdependent risk factors,” Skrbkova added.
Fox News Digital’s Melissa Rudy contributed reporting.
Health
What’s healthier to drink: cold or hot water? Here’s what an expert says
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A viral wellness trend asks a simple question — is warm or cold water healthier? — but the science behind it is more nuanced.
Previous research shows that food and beverage temperature has a measurable effect on things like anxiety and gut discomfort.
One of the most long-standing health claims is that ice-cold water boosts calorie burn by forcing the body to heat it up. While this is grounded in science, the actual impact may be minimal.
Ultimately, experts say, the health impact of water temperature depends on the goal — weight loss, athletic performance, digestion or comfort.
Does cold water boost weight loss?
“As per research, in the 90 minutes after consuming cold or room temperature water, energy expenditure increases minimally by 2.9% (cold water) and 2.3% (room temperature),” Tanya Freirich, a registered dietitian and diabetes expert in North Carolina, told Fox News Digital.
Extra water may suppress the appetite or may play a part in energy production and expenditure, experts say. (iStock)
While the body does expend energy to warm up cold water, Freirich noted that it’s “not significant enough to make it worthwhile” for weight loss. Hot water doesn’t exactly melt fat, however, she added.
For those looking to lose or manage weight, Freirich suggests focusing on “how much” rather than “how cold.” She pointed to research involving overweight women who added an extra 1.5 liters of water to their daily intake. Over eight weeks, the participants saw measurable weight loss.
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“The extra water may suppress the appetite or may play a part in energy production and expenditure,” Freirich said. The temperature of drinking water should not affect how well the body utilizes nutrients, she added, noting that more research is needed.
For those exercising in heat and humidity, the goal should be to rehydrate without excessive fluid loss through sweat. Research on thermoregulation suggests there is an ideal water temperature for athletes.
The temperature of drinking water should not affect how well the body utilizes nutrients, according to an expert. (iStock)
While drinking water can trigger sweating as the body regulates its temperature, 60.8 degrees Fahrenheit was associated with the least amount of perspiration.
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“Cool, but not cold,” Freirich emphasized. Drinking water in this specific range helps the body rehydrate efficiently without causing gastrointestinal distress.
Warm water and digestion
There are several reasons someone might opt for warm water, including its effect on relaxation and digestion. Studies have found that warmer liquids can accelerate gastric emptying, effectively waking up the gut.
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The benefits may be mental as well. Freirich points to research showing that hot black tea leads to lower levels of cortisol — the body’s primary stress hormone — and greater subjective relaxation after stressful tasks.
The preference for warm water often stems from its effect on the rest and digestion. Studies have found that warmer liquids can accelerate gastric emptying, effectively waking up the gut. (iStock)
Medical triggers
Freirich warns that very cold water can cause difficulty for those with swallowing disorders, or can trigger migraines and “brain freeze” in people with sensitive nerves.
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Furthermore, those with irritable bowel syndrome (IBS) may find that ice-cold drinks trigger digestive discomfort.
Ultimately, the best temperature is the one that encourages people to drink, the dietitian said. The general recommendation for adults is to consume seven to eight glasses of water per day.
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“Most importantly, it is important for everyone to stay adequately hydrated,” Freirich said.
Health
Alarming report reveals what’s driving deadly cancer surge in young adults
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Top stories
→ Origin of deadly cancer affecting young adults revealed in alarming report
→ Scientists make startling discovery when examining prostate cancer tissue
→ Seniors over 80 who eat specific diet may be less likely to reach 100
Colorectal cancer rates are surging among younger adults, with those 65 and under now comprising 45% of new diagnoses compared to 27% in 1995. (iStock)
On the lookout
→ Brain aging may accelerate after cancer treatment
→ Ozempic-style drugs could slash complication risks after heart attacks
→ Aging process could accelerate due to ‘forever chemicals’ exposure
Weight-loss drugs may prevent deadly heart complications by opening blocked blood vessels after heart attacks, groundbreaking new research reveals. (iStock)
Conversation starters
→ Do collagen supplements really improve skin? Major review reveals the truth
→ ChatGPT could miss your serious medical emergency, study suggests
→ Diabetes surge could be driven by ‘healthy’ breakfasts, doctor warns
Medical advances
→ Diabetes breakthrough approach could protect cells and prevent disease
→ Decades-old seizure drug could have potential for Alzheimer’s prevention
Stat of the week
More than 59% of women are predicted to have high blood pressure by 2050.
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