Monthly Archives: April 2025

Research Links Metal Exposure to Gut Health Issues in Children

A groundbreaking study led by Dr Yike Shen, assistant professor of earth and environmental sciences at The University of Texas at Arlington (UTA), in collaboration with researchers from UCLA, the University of Sherbrooke, and Harvard University, has revealed a compelling link between exposure to metals and changes in the gut microbiome of children. This multidisciplinary research team analysed stool samples from 116 children aged 8 to 12 in Quebec, uncovering notable associations between metal concentrations and microbial changes in the digestive tract. The study highlights how environmental contaminants, hefty metals, may subtly but significantly affect children’s health through microbiological mechanisms that are only beginning to be understood.

The gut microbiome, a diverse community of microorganisms residing in the digestive tract, plays a central role in human health by aiding digestion, regulating the immune system, and supporting metabolic processes. The research team discovered that specific metals corresponded with alterations in these microbial communities’ composition and function. For example, children with higher levels of zinc and magnesium showed an increased abundance of Turicibacter sanguinis, a bacterium associated with obesity and diabetes. In contrast, higher levels of cadmium correlated with decreased levels of Eubacterium eligens, a beneficial microbe known for its anti-inflammatory effects and contribution to healing and gut barrier function.

“Our study leverages microbiome data to reveal important connections between metal exposure and the childhood gut microbiome taxonomy and functional profiles,” said Dr Shen. “These findings open new avenues for understanding how environmental exposures might predispose children to health issues later in life.” While the effects of metals such as lead and cadmium on child development have been documented extensively—particularly their neurotoxic and developmental risks—this study breaks new ground by focusing on how such exposures affect the gut ecosystem, a key but often overlooked player in overall health.

Dr Arne Winguth, professor and chair of UTA’s Department of Earth and Environmental Sciences, emphasised the significance of the findings. “We know that exposure to metals can be quite harmful to growth and development in children, and this new study shows a link to disruptions in gut flora, which has not been widely examined before,” he noted. These disruptions could have downstream effects on metabolism, immune regulation, and even neurological outcomes, adding urgency to ongoing calls for environmental monitoring and public health protections aimed at reducing children’s exposure to toxic substances.

Children are especially vulnerable to environmental toxins; metal exposure can come from natural and human-made sources. Mineral deposits in the Earth’s crust may contaminate groundwater or soil, while industrial activity, heavy pesticide use, and residual lead paint in older homes also contribute to exposure risks. As these exposures often go unnoticed, understanding their hidden biological impacts—such as microbiome disruption—becomes increasingly important for prevention strategies. The study has drawn national recognition, having been selected as one of the Papers of the Month by Environmental Factor, a publication of the National Institute of Environmental Health Sciences (NIEHS), which also helped fund the research.

Dr Shen attributed the study’s success to strong collaborative efforts across institutions. Her team at UTA partnered closely with Dr Feng Gao’s group at UCLA and Dr Larissa Takser’s team at the University of Sherbrooke, which oversees the cohort in Quebec. “This study would not be possible without this amazing team of researchers,” Shen said. She also confirmed that future work will explore the long-term health implications of microbiome changes caused by metal exposure, helping to shape new research directions in environmental health science and paediatric wellbeing.

More information: Yike Shen et al, Associations of Stool Metal Exposures with Childhood Gut Microbiome Multiomics Profiles in a Prospective Birth Cohort Study, Ecotoxicology and Public Health. DOI: 10.1021/acs.est.4c09642

Journal information: Ecotoxicology and Public Health Provided by University of Texas at Arlington

Study Links Plastic Chemical to Worldwide Spike in Heart Disease Deaths

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According to a new global analysis, daily exposure to certain chemicals used in the manufacture of plastic household items may have contributed to over 356,000 deaths from heart disease worldwide in 2018. Researchers found that phthalates—chemicals used to soften plastics—were widely implicated. Although these substances are commonplace across the globe, regions such as the Middle East, South Asia, East Asia, and the Pacific carried a disproportionately high burden, accounting for nearly three-quarters of the total deaths linked to exposure.

Phthalates have long been associated with health problems, including obesity, diabetes, infertility, and cancer. Found in cosmetics, detergents, plastic pipes, insect repellents, and many other products, these chemicals degrade into microscopic particles that are easily ingested or absorbed. In this latest study, led by researchers at NYU Langone Health, the focus was on a specific phthalate, di-2-ethylhexyl phthalate (DEHP), commonly used in food containers and medical devices. Prior studies have already indicated that DEHP can trigger inflammation in the arteries, increasing the long-term risk of heart attacks and strokes.

The research team estimated that DEHP exposure alone was responsible for 356,238 deaths globally among men and women aged 55 to 64 in 2018, representing over 13% of heart disease mortality in that age group. Sara Hyman, the lead author and an associate research scientist at NYU Grossman School of Medicine, stated that their findings reinforce the mounting evidence of the serious health risks of phthalates. She emphasised that the connection between everyday chemical exposure and one of the world’s leading causes of death demands urgent attention from both the public and policymakers.

The economic impact of these deaths is staggering. The study calculated that the resulting financial burden could amount to around $510 billion and possibly as much as $3.74 trillion globally. This builds on a previous 2021 study by the same team, which linked phthalates to over 50,000 premature deaths annually among older Americans. However, the current investigation is believed to be the first to produce a worldwide estimate of cardiovascular deaths—or any health outcome—caused by exposure to phthalates.

Data for the study were gathered from dozens of population surveys across 200 countries and territories. Researchers analysed urinary chemical markers left behind by DEHP and combined these with mortality statistics from the Institute for Health Metrics and Evaluation, a US-based research organisation. The findings revealed that East Asia and the Middle East accounted for 42% of heart disease deaths related to DEHP exposure, while East Asia and the Pacific together contributed 32%. India experienced the highest number of deaths, followed by China and Indonesia. These results remained significant even after adjusting for population sizes.

The authors suggest that higher exposure rates in these regions may be due to rapid industrialisation and widespread plastic production, often without strong regulatory controls. Senior author Dr Leonardo Trasande, Professor of Paediatrics and Environmental Medicine at NYU Grossman School of Medicine, stressed the disparity, noting that some countries bear far greater risks. He called for urgent global regulatory action to limit exposure, especially in areas where plastic use and industrial growth are surging without adequate safety measures.

While the study highlights a strong association between DEHP exposure and heart disease deaths, the researchers caution that causation cannot be definitively established. The analysis also did not account for deaths caused by other phthalates or among age groups outside the 55 to 64 range, suggesting that the actual impact may be even greater. Future research will focus on measuring the benefits of reduced phthalate exposure over time and investigating other health risks linked to these pervasive chemicals, such as preterm births. The authors hope their work will inspire urgent global efforts to mitigate the health dangers posed by plastic pollution.

More information: Sara Hyman et al, Phthalate exposure from plastics and cardiovascular disease: global estimates of attributable mortality and years life lost, EBioMedicine. DOI: 10.1016/j.ebiom.2025.105730

Journal information: EBioMedicine Provided by NYU Langone Health / NYU Grossman School of Medicine

Sleep Proven Vital for Brain’s Memory Management, Baycrest Researchers Report

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Although the positive influence of sleep on cognitive function has been recognised for some time, researchers at Baycrest have now discovered that a good night’s sleep may do more than preserve memory – it may actively enhance it. Their findings are the first to show that sleep protects memories and improves our ability to recall the sequence of life events, even more than a year later.

“While aspects of memory such as object size and colour tend to deteriorate over time, sleep appears to sharpen our memory for the order of experiences,” explains Dr Brian Levine, Senior Scientist at the Rotman Research Institute, part of the Baycrest Academy for Research and Education (BARE), and senior author of the study. Their research, titled “Sleep selectively and durably enhances memory for the sequence of real-world experiences,” was recently published in Nature Human Behaviour. According to Dr Levine, these results deepen our understanding of sleep’s critical role in weaving our experiences into lasting memories.

Unlike many memory studies, which typically require participants to memorise words or images under controlled laboratory conditions, this research introduced a highly novel and immersive real-world experience. Dr Levine, working alongside then-graduate students Dr Nicholas B. Diamond and Dr Stephanie Simpson, designed a 20-minute audio-guided tour featuring a series of artworks displayed at Baycrest, a globally renowned ageing and brain health centre in Toronto, Ontario. Participants completed the tour and were tested on their memory at intervals ranging from one hour to fifteen months after the experience. Tests measured both recall of the artworks’ physical features and the sequence of tour items. Notably, while memory for physical characteristics declined over time, sleep substantially boosted participants’ ability to recall the sequence of events.

To further validate their findings, the researchers conducted a second study where participants were randomly assigned to either a sleep or wake group. Those in the sleep group completed the tour and an initial memory test in the evening, followed by a night in a sleep laboratory where their brain activity was monitored through electroencephalography (EEG). They then took a second memory test the next morning. In contrast, the wake group toured and tested in the morning and underwent their second memory assessment in the evening after a full day of typical activities. Both groups participated in additional memory tests one week, one month, and fifteen months after the initial experience to measure the long-term effects of sleep on memory retention.

The results of the studies were striking. Sleep significantly enhanced memory for the sequence of the tour items, an advantage that was detectable after just a single night and remained evident even fifteen months later. However, sleep did not provide similar benefits for the memory of the artworks’ features, such as their shape or colour, which continued to decline over time. Brain wave recordings revealed that specific neural activity during deep sleep – particularly the presence of slow waves and sleep spindles – was associated with greater overall memory enhancement, suggesting a neurophysiological basis for these improvements.

This research reinforces the vital role of sleep as a foundation of good health, not only for physical well-being but for cognitive resilience as well. It highlights how deep sleep bolsters explicitly our ability to remember the chronological structure of daily events, even as finer details inevitably fade. These findings may also offer insights into the memory challenges older adults face, particularly those living with dementia, where disruption of deep sleep could contribute to difficulties in recalling life sequences. “The impact of sleep on memory is truly profound; even one night of good sleep can create lasting memory benefits that persist for over a year,” said Dr Levine.

More information: Brian Levine et al, Sleep selectively and durably enhances memory for the sequence of real-world experiences, Nature Human Behaviour. DOI: 10.1038/s41562-025-02117-5

Journal information: Nature Human Behaviour Provided by Baycrest Corporate Centre for Geriatric Care

Mindfulness and Cognitive Behavioural Therapy Alleviate Chronic Low Back Pain

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Although numerous treatments exist for low back pain, few provide real relief for the one in four Americans living with this chronic and disabling condition, which is also a significant cause of disability worldwide. More than 80% of individuals with chronic low back pain report a strong desire for better treatment options. In the absence of sufficient relief, many turn to opioid medications, which, while offering temporary alleviation, carry serious risks of addiction.

A multi-institutional research team led by Penn State College of Medicine and the University of Wisconsin-Madison has delivered promising results. In a randomised clinical trial, they found that eight weeks of either mindfulness-based therapy or cognitive behavioural therapy (CBT) led to significant improvements in physical function, pain levels, quality of life, and even reductions in opioid use. Importantly, these benefits lasted up to 12 months after treatment.

Published on 7 April in JAMA Network Open, this study is the largest trial yet to directly compare mindfulness and CBT for opioid-treated chronic low back pain, and it involved a longer follow-up than previous research. “Both mindfulness and cognitive behavioural therapy were shown to be safe, effective treatments, providing lasting benefits for people with opioid-treated chronic back pain,” said Professor Aleksandra Zgierska, lead author of the study. She called for these therapies to be standard options within routine clinical care.

Chronic low back pain is complex, often involving physical, emotional, and psychological components. Although behavioural therapies have been previously suggested as helpful, earlier studies tended to be small and short-term. Professor Eric Garland of the University of California, San Diego, noted that pain is still primarily viewed as a purely physical issue despite growing evidence that psychological interventions can be equally crucial.

The trial enrolled 770 adults across three sites: Madison, Wisconsin; Boston, Massachusetts; and Salt Lake City, Utah. All participants had moderate-to-severe low back pain and functional impairments and had been using opioids daily for at least three months. They were randomly assigned to receive either mindfulness or CBT through therapist-led group sessions lasting two hours each week for eight weeks. Participants also practised daily at home and continued their regular care.

Both groups reported lasting improvements at follow-up intervals of three, six, nine, and twelve months. Participants experienced reduced pain, improved ability to carry out daily activities, enhanced quality of life, and lower opioid dosages, even though they were not directly instructed to decrease their medication use. These findings suggest that learning new coping strategies naturally led participants to manage their symptoms more independently.

Penney Cowan, founder of the American Chronic Pain Association and co-author of the study, described the findings as a vital hope. “People can live with pain, but they need to know how to manage it. This study shows they can,” she said. The researchers stressed that mindfulness and CBT are not cures but powerful tools. As Professor Garland explained, these therapies teach patients to draw on their internal resources, offering lasting relief and improved quality of life, even amidst ongoing chronic pain.

More information: Aleksandra Zgierska et al, Mindfulness vs Cognitive Behavioral Therapy for Chronic Low Back Pain Treated With Opioids, JAMA Network Open. DOI: 10.1001/jamanetworkopen.2025.3204

Journal information: JAMA Network Open Provided by Penn State

Home Care Cooperatives Could Hold the Solution to the Growing Elderly Caregiver Shortage

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According to a new study, home care cooperatives could offer a vital solution to the ongoing shortage of paid caregivers for older adults. The research reveals that caregivers working within cooperative models experience greater respect, autonomy, workplace support, and compensation than those employed by traditional home care agencies. These enhanced conditions help explain why cooperatives have achieved turnover rates approximately half that of conventional providers, many of which struggle with persistent employee dissatisfaction and high staff attrition.

Without significant innovation and policy reform, millions of older adults across the United States may find themselves without the necessary support to continue living safely in their own homes, warned Dr Geoffrey Gusoff, an assistant professor of family medicine at the David Geffen School of Medicine at UCLA and the lead author of the study. As the demand for elderly care continues to surge with an ageing population, the need for sustainable, practical solutions to recruit and retain qualified caregivers has never been more urgent. Dr Gusoff emphasised that home care cooperatives offer an innovative and promising pathway to improving both the quality of caregiver jobs and the stability of the caregiving workforce. “Home care cooperatives represent an innovative approach to addressing the caregiver crisis to improve caregiver job quality and retention,” he stated. “Other home care businesses can learn from cooperatives’ practices to enhance caregiver jobs and ultimately retain and recruit more workers to meet the growing demand.”

In practice, home care cooperatives deliver the same essential services as traditional home care agencies, including assistance with activities of daily living such as bathing, medication management, and meal preparation. However, the key difference lies in the structure of ownership and management. Unlike traditional agencies, the caregivers own and operate cooperatives, fostering a stronger sense of collaboration, shared purpose, and mutual accountability. This structure empowers caregivers to have a direct say in the decision-making processes that affect their daily work, contributing to higher job satisfaction and a more profound commitment to their profession.

The team interviewed 23 home care workers and nine staff members across five cooperatives to conduct their research. Most participants had previously worked in traditional paid caregiving roles, offering them a unique perspective on the comparative advantages of the cooperative model. The interviews highlighted four major factors contributing to the superior job quality and lower turnover observed within cooperatives. First, caregivers enjoyed higher levels of input and control, particularly in three crucial areas: managing patient care, scheduling their work shifts, and shaping broader agency policies. Second, a palpable sense of community and teamwork emerged, primarily driven by the cooperative ownership structure and the mutual support among staff and workers. Third, a culture of respect for caregivers was pervasive, with many workers reporting that they felt genuinely valued for the first time in their careers. Finally, better compensation — not only in wages but also in benefits such as health insurance and opportunities for profit-sharing — played a central role in encouraging workers to stay within the cooperative system.

While the findings are compelling, the researchers did acknowledge certain limitations in their study. The possibility of recall or selection bias must be considered, as participants were asked to reflect on and compare their past experiences in traditional agencies with their current roles in cooperatives. Additionally, the study sample included only English-speaking home care workers, potentially overlooking the experiences of a significant portion of the caregiving workforce. Furthermore, other factors not directly explored — such as the agency’s size or regional differences — may also influence perceptions of job satisfaction and retention within cooperatives.

Dr Gusoff and his team highlighted the need for further research to deepen understanding of the factors influencing caregiver satisfaction and retention. “The next step is to test the factors identified in the study through a national caregiver survey to better quantify the role of each factor in caregiver retention, satisfaction, and care quality,” he explained. Such a survey would help illuminate the broader applicability of the cooperative model across different contexts. It could inform policymakers and industry leaders seeking to strengthen the caregiving workforce in the years ahead.

Ultimately, the study’s findings suggest that home care cooperatives could serve as a blueprint for transforming the caregiving profession into one characterised by respect, empowerment, and economic security. Adopting some cooperative practices — such as giving workers a meaningful voice in decisions, fostering strong workplace communities, and ensuring fair compensation — even traditional agencies might improve the quality of their jobs. In doing so, they could help avert a looming crisis that threatens the well-being of millions of elderly Americans who wish to age with dignity and support in their own homes.

More information: Geoffrey Gusoff et al, Perceived Contributors to Job Quality and Retention at Home Care Cooperatives, JAMA Network Open. DOI: 10.1001/jamanetworkopen.2025.4457

Journal information: JAMA Network Open Provided by University of California – Los Angeles Health Sciences

Air Pollution Linked to Decline in Brain Health Among Older Adults

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A new study led by researchers at University College London (UCL) has found that prolonged exposure to high levels of air pollution may significantly damage the brain health of older adults living in England. Published in The Journals of Gerontology: Series A, the study links sustained exposure to nitrogen dioxide (NO₂) and delicate particulate matter (PM2.5) with declines in cognitive abilities, particularly in language skills. The findings suggest that the harmful effects of air pollution extend well beyond the heart and lungs, posing a serious threat to cognitive functioning as people age.

Nitrogen dioxide is primarily released into the atmosphere through the combustion of fossil fuels, with the chief sources being cars, buses, trucks, power stations, and various industrial machinery. Meanwhile, PM2.5, composed of microscopic particles, typically arises from burning petrol, diesel, oil, and wood. Due to their tiny size, PM2.5 particles can penetrate the lungs and enter the bloodstream, potentially causing widespread physiological damage, including the brain.

The researchers analysed data from 1,127 adults aged 65 and over who participated in the ELSA Harmonised Cognitive Assessment Protocol (ELSA-HCAP) 2018. They assessed participants’ exposure to air pollution over eight to ten years between 2008 and 2017. Cognitive performance was evaluated across several domains: memory, executive function (planning, decision-making, and problem-solving), language ability, and overall cognitive function. Participants underwent well-established neurocognitive tests, such as the East Boston Memory Test and the Wechsler Memory Scale, immediate and delayed recall tasks, backwards counting exercises, and shape drawing assessments.

The findings demonstrated that individuals living in areas with the highest NO₂ and PM2.5 pollution levels performed notably worse on cognitive tests than those with average pollution levels. The most striking association was in language skills, where individuals exposed to the highest pollution levels were disproportionately represented in the bottom third of test performance. This suggests a potentially specific vulnerability of language processing abilities to long-term environmental pollution.

The study further indicated that the source of air pollution matters. Pollutants from industrial activity, residential heating, and the combustion of fuels such as coal and oil were most strongly linked to impaired language performance. Although the researchers did not investigate the biological mechanisms underlying these findings, they propose that damage to the temporal lobe – a brain region essential for language processing and semantic fluency – may explain the observed cognitive effects. They emphasise the need for further research to understand better the neurological pathways through which pollutants exert their harmful influence.

Lead author Dr Giorgio Di Gessa (UCL Epidemiology & Health) commented: “Our study shows that air pollution is not just detrimental to respiratory and cardiovascular health, but also has profound implications for the brain, particularly with long-term exposure. The most consistent associations we observed were with language ability, hinting that some pollutants may selectively impair specific cognitive functions.” Echoing this call for action, Deputy Director of the ELSA study, Professor Paola Zaninotto, added: “By tracking pollution levels over a decade with high-quality data, we provide robust evidence that prolonged environmental exposure can inflict lasting damage on brain health.”

However, the researchers acknowledge certain limitations. The air pollution data covered only ten years, which may not fully represent a participant’s lifetime exposure. Additionally, annual averages were used, potentially missing the cognitive effects of short-term spikes in pollution. The relatively small, England-based sample also restricts the generalisability of the findings to other settings or larger populations. Nevertheless, the study offers compelling evidence for the urgent need to strengthen air quality regulations, particularly to protect the ageing population from preventable cognitive decline.

More information: Giorgio Di Gessa et al, Cognitive Performance and Long-term Exposure to Outdoor Air Pollution: Findings From the Harmonized Cognitive Assessment Protocol Substudy of the English Longitudinal Study of Ageing (ELSA-HCAP), The Journals of Gerontology Series A. DOI: 10.1093/gerona/glaf060

Journal information: The Journals of Gerontology Series A Provided by University College London

Predicting Long-Term Care Needs in Older Adults Through Body Composition Analysis

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As populations worldwide continue to age, the urgency of preventing functional decline and mitigating the future need for long-term care among older adults is becoming increasingly apparent. A straightforward method for evaluating an individual’s physical condition involves using body composition analysers, particularly for assessing muscle mass. However, emerging research has cast doubt on the reliability of muscle mass alone as a predictor of health outcomes, highlighting instead the importance of assessing “muscle quality”—a more nuanced and potentially informative metric.

Body composition analysers transmit a weak alternating electrical current through the body and measure its resistance. By employing currents at multiple frequencies, these devices can provide insight into the physiological state of cell membranes—quantified as the phase angle—as well as the ratio of intracellular water (ICW) to extracellular water (ECW), both of which serve as proxies for tissue integrity and function. Numerous studies have demonstrated that such measures can distinguish between tissues that contribute to muscle contraction and those that do not, effectively offering an index of muscle quality. Since the ability of muscles to contract is vital for performing everyday activities, indicators of muscle quality may correlate more directly with future risk of functional impairment and consequent dependence on long-term care.

In this context, a longitudinal study was conducted using body composition data from 858 adults aged 65 years or older residing in Kasama City, Ibaraki Prefecture, Japan. The researchers focused on two indicators derived from bioelectrical impedance analysis: the phase angle and the extracellular to intracellular water resistance ratio. These individuals were monitored over 12 years to investigate the association between these physiological markers and the eventual need for long-term care services.

The findings revealed a compelling relationship: individuals exhibiting lower values for the phase angle and the ECW/ICW resistance ratio—particularly in the lower limbs—faced a significantly increased risk of becoming dependent on long-term care. This association was most pronounced when these values fell below the cohort median. In contrast, conventional muscle mass measurements did not correlate statistically with the onset of care dependency. These results underscore the limitations of traditional metrics and suggest that indices reflecting muscle quality may be more predictive of future frailty.

To translate these findings into practical application, the researchers established standard reference values for each indicator, estimating thresholds that signify increased risk of dependency within four and ten years, respectively. Such benchmarks serve as valuable tools for early intervention strategies, allowing health professionals and policymakers to identify at-risk individuals and implement preventive measures more effectively.

Importantly, body composition analysers offer several logistical advantages. The assessment process is non-invasive and requires minimal effort from the subject—simply stepping onto the device initiates the measurement—and no specialised personnel are needed to operate the machinery. This ease of use applies well to implementation in diverse settings, including medical clinics, long-term care facilities, and community centres. With widespread adoption, such technology could become an essential component of public health strategies aimed at reducing the incidence of care dependency in older populations, ultimately improving quality of life and reducing the societal burden associated with ageing.

More information: Yujiro Asano et al, Segmental phase angle and the extracellular to intracellular water ratio are associated with functional disability in community-dwelling older adults: A follow-up study of up to 12 years, Nutrition. DOI: 10.1016/j.nut.2025.112709

Journal information: Nutrition Provided by University of Tsukuba

Mitigating Cognitive Fatigue and Ageing Effects Through Regular Exercise

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According to new research, retired individuals who maintain a consistent exercise routine exhibit a stronger ability to withstand the detrimental effects of mental fatigue. The study, recently published in the Journal of Aging and Physical Activity, was conducted by a collaborative team from the University of Birmingham and the University of Extremadura in Spain. Their research explored the influence of age and physical activity on susceptibility to mental fatigue, examining cognitive and physical performance across various tests.

In the initial phase of the investigation, researchers observed two age groups of sedentary men: those aged 52 to 64 and those aged 65 to 79. The findings revealed that the older cohort consistently underperformed in cognitive and physical assessments compared to their younger counterparts. These impairments were particularly pronounced when participants were subjected to tasks following periods of induced mental fatigue, suggesting an age-related increase in vulnerability to cognitive depletion.

A second study was conducted to probe further this relationship involving retired men and women aged 66 to 72. This time, participants were divided according to their activity levels. Results demonstrated a marked difference: older adults who regularly engaged in physical activity outperformed their sedentary peers across mentally rested and fatigued conditions. This suggests habitual exercise is a protective factor, bolstering cognitive and physical resilience even under fatigue.

Professor Chris Ring, from the University of Birmingham and lead author of the study, highlighted the implications of these findings. “This study underscores the importance of maintaining physical activity as we age,” he explained. “It provides compelling evidence that regular exercise not only enhances physical fitness but also mitigates the effects of mental fatigue on both cognitive and physical performance.”

The research forms part of a broader international initiative examining the links between ageing, exercise, and cognitive health. Professor Ring and his colleagues assert that regular physical activity is a powerful, accessible intervention for preserving function and performance in later life. It supports cardiovascular and muscular health and appears to foster greater resistance to mental fatigue—a common challenge among older adults that can diminish the quality of life and functional independence.

Moreover, the team observed that age and inactivity amplify the impairing effects of mental fatigue, reinforcing the critical role of an active lifestyle in healthy ageing. Older adults who remain inactive are more susceptible to the natural declines associated with ageing and more likely to experience sharp performance drops when mentally taxed.

Professor Ring proposes a three-pronged strategy to empower older individuals to enhance their resilience in demanding situations. Firstly, he advocates for increased regular physical activity tailored to the individual’s capacity and preferences. Secondly, he recommends a preparatory warm-up that blends cognitive and physical tasks—such as puzzles combined with light aerobic activity—to better equip individuals for upcoming challenges, especially when they feel mentally drained. Lastly, he highlights the potential of Brain Endurance Training (BET), a method that integrates cognitive exercises with physical workouts, as a means to improve both mental and physical endurance.

In sum, this research contributes to a growing body of evidence affirming the multifaceted benefits of physical activity in later life. By demonstrating that regular exercise enhances physical capacity, cognitive function, and resilience to fatigue, it offers a persuasive argument for embedding physical activity into the daily routines of older adults. The study promotes exercise as a vehicle for healthy ageing and provides practical strategies for those seeking to remain sharp, agile, and independent well into their retirement years.

More information: Chris Ring et al, The Detrimental Effects of Mental Fatigue on Cognitive and Physical Performance in Older Adults Are Accentuated by Age and Attenuated by Habitual Physical Activity, Journal of Aging and Physical Activity. DOI: 10.1123/japa.2024-0227

Journal information: Journal of Aging and Physical Activity Provided by University of Birmingham

Navigating Freedom: How GPS Empowers Older Adults Behind the Wheel

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A recent study published on 3 April 2025 in the open-access journal PLOS Digital Health suggests that GPS technology may significantly enhance road mobility among older adult drivers. Conducted by Sol Morrissey of the University of East Anglia and colleagues, the research highlights how electronic navigation tools can help older individuals maintain a sense of independence and continue engaging in everyday travel, even in the face of age-related cognitive challenges.

Driving remains the preferred mode of transport for most older adults. However, natural declines in spatial awareness and cognitive functioning can erode confidence and restrict the frequency and distance of driving. Sustaining driving mobility—the ability to drive regularly and over longer distances—is crucial for maintaining physical autonomy and supporting social engagement and cognitive well-being. Although GPS and other navigational systems are gaining traction among ageing populations, their precise impact on driving behaviour has remained underexplored until now.

To address this gap, Morrissey and colleagues surveyed 895 drivers aged 65 and older, with the average age being 71. The study deliberately excluded individuals with severe untreated medical impairments or excessive alcohol use to ensure that participants could safely operate a vehicle. Participants completed a series of assessments, including self-reported driving patterns, a standardised cognitive evaluation, and a subjective questionnaire to gauge their wayfinding abilities.

Findings revealed that more than 80% of participants reported using some form of navigational assistance while driving. Among these users, over half indicated that they utilised GPS for selected journeys, while more than 70% used it to guide them through entire trips. Fewer than 3% relied on GPS for every drive, suggesting that older adults remain discerning about when to use digital navigation tools.

Perhaps the most compelling insight emerged from participants who demonstrated poor objective wayfinding skills. Within this group, those who used GPS reported significantly higher levels of driving mobility than those who did not. Similarly, participants who described themselves as having a poor sense of direction were more likely to depend on GPS navigation. These findings indicate a positive relationship between GPS use and sustained driving activity, particularly among individuals who might otherwise restrict their travel due to spatial or directional challenges.

The researchers suggest that integrating navigational technology into public health and ageing strategies could be a promising approach to promoting safe and independent driving among older adults. Future investigations could benefit from examining the influence of cultural norms, national driving conditions, the design of specific navigation systems, and the social dynamics introduced by passengers or copilots in the vehicle.

The authors commented on the study’s implications: “In older age, driving is vital for quality of life and wellbeing. Our study shows that older drivers with worse spatial abilities who use GPS navigation assistance have better driving mobility, and therefore supporting older adults in using these tools can help them maintain their driving.”

By shedding light on the practical benefits of GPS navigation for ageing drivers, this study provides a timely reminder that digital technologies—when thoughtfully integrated—can help mitigate the constraints of ageing and foster prolonged independence on the road. As populations age globally, these insights may prove instrumental in shaping transportation policies and technologies that cater to older adults’ evolving needs.

More information: Sol Morrissey et al, GPS navigation assistance is associated with driving mobility in older drivers, PLOS Digital Health. DOI: 10.1371/journal.pdig.0000768

Journal information: PLOS Digital Health Provided by PLOS

Hypertension-Induced Renal Changes Begin in the Early Stages

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A research team from the Medical University of Vienna has uncovered early kidney structural alterations associated with high blood pressure independent of diabetes. Their findings reveal that arterial hypertension alone may initiate damage to podocytes — the specialised cells responsible for the kidney’s filtration barrier — even without comorbid conditions such as type 2 diabetes. Published in the journal Hypertension, the study underscores the critical need for timely detection and rigorous management of elevated blood pressure to mitigate the risk of renal impairment.

The investigation, led by Christopher Paschen and Rainer Oberbauer of the Clinical Division of Nephrology and Dialysis (Department of Medicine III) and Heinz Regele of the Clinical Department of Pathology, analysed the renal tissue from 99 individuals. These participants either had coexisting hypertension and type 2 diabetes or were free from both conditions, thereby allowing the researchers to isolate the independent effects of high blood pressure. The samples were derived from non-pathological areas of kidneys surgically removed for tumour treatment (tumour nephrectomies) performed between 2013 and 2018.

Advanced imaging techniques and computer-assisted analysis were employed to evaluate the structure of the renal corpuscles (glomeruli) and their associated podocytes. As essential components of the glomerular filtration barrier, podocytes are pivotal in maintaining renal function. Their size and density serve as key indicators of early renal damage. The research incorporated artificial intelligence through deep learning algorithms, enabling precise, automated analysis of digital tissue sections. This method allowed for high-resolution quantification of podocyte morphology and glomerular volume.

The results revealed a marked reduction in podocyte density among patients with hypertension and a noticeable enlargement of the cell nuclei compared with healthy controls. These morphological changes were consistent regardless of whether type 2 diabetes was also present, suggesting that hypertension alone is sufficient to initiate structural kidney damage. “Our findings suggest that these alterations represent the first microscopically detectable stage of kidney dysfunction,” said first author Christopher Paschen. The researchers interpret this as a potential precursor to clinically apparent renal disease, emphasising the importance of preemptive intervention.

Study leaders Rainer Oberbauer and Heinz Regele further highlighted the implications of these results: “Early identification and consistent treatment of high blood pressure could help decelerate the progression of chronic kidney disease and prevent permanent renal damage.” The evidence supports the notion that even before symptoms become apparent, hypertension may quietly compromise kidney integrity through changes to the podocyte network. This finding could shift current screening and management strategies.

Chronic kidney disease is frequently attributed to hypertension and type 2 diabetes, two of the most prevalent global health challenges. While the mechanisms by which diabetes leads to nephropathy are well understood, the direct impact of hypertension on renal structure—particularly in the absence of diabetes—has remained less clear. This study offers new clarity on the subject, providing compelling evidence that hypertension alone can induce measurable changes in kidney architecture. These insights may significantly impact early diagnostic protocols and therapeutic planning, potentially influencing future nephrology and primary care guidelines.

In sum, the Vienna-based team’s work contributes vital new knowledge to the field of renal medicine, illustrating that damage to the kidney’s delicate filtration system may occur earlier than previously recognised and in patient populations not typically flagged for heightened renal risk. Their integration of AI-driven analysis further demonstrates the value of digital pathology in uncovering subtle yet meaningful physiological shifts. As hypertension rises globally, the study reinforces the urgent necessity of proactive cardiovascular and renal health monitoring.

More information: Christopher Paschen et al, Association of Podometrics Findings in Patients With Hypertension and Type 2 Diabetes: A Retrospective Analysis, Hypertension. DOI: 10.1161/HYPERTENSIONAHA.124.24379

Journal information: Hypertension Provided by Medical University of Vienna

Hypertension and Atrial Fibrillation: A Dangerous Duo Demanding Joint Screening, Say Experts

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A coalition of 29 international medical experts is calling for urgent changes in how two of the most prevalent cardiovascular conditions—hypertension and atrial fibrillation—are detected. According to a recent expert review, simultaneously screening for both conditions could prevent thousands of strokes yearly. Published in Circulation, a respected journal of the American Heart Association, the review underscores the dangerous synergy between high blood pressure and atrial fibrillation (AF). It warns that failing to detect one while monitoring for the other represents a missed opportunity in preventative healthcare.

Hypertension, more commonly known as high blood pressure, is already a well-established risk factor for stroke. Atrial fibrillation, meanwhile, is the most common sustained heart rhythm disorder, marked by a rapid and irregular heartbeat that can promote the formation of blood clots within the heart. These clots can travel to the brain, leading to ischaemic strokes. When these two conditions co-exist, they do not merely double the risk—they amplify it exponentially, significantly increasing the chances of stroke, heart failure, and even cognitive disorders such as dementia.

Professor Teemu Niiranen, a Professor of Internal Medicine at the University of Turku in Finland and one of Europe’s foremost authorities on hypertension, led the authorship of the review. He describes the relationship between hypertension and AF as especially perilous, calling it a “dangerous combination” in which each condition worsens the other. “Hypertension and atrial fibrillation are a dangerous combination—one leads to the other, and together they significantly increase the risk of stroke, heart failure, and dementia,” says Niiranen. Despite the extensive evidence linking the two, atrial fibrillation remains severely underdiagnosed, mainly due to the absence of routine screening, even in individuals already known to have high blood pressure.

While hypertension is commonly detected through standard blood pressure checks, atrial fibrillation can often remain hidden. Many individuals with AF experience no symptoms, meaning the condition may go unnoticed until it triggers a serious event, such as a stroke. Niiranen and his co-authors argue that this makes early screening critical. Simple, inexpensive tools such as pulse checks or blood pressure monitors with irregular heartbeat alerts could identify AF early and allow timely intervention. “The combination of high blood pressure and atrial fibrillation is like a ticking time bomb. A simple pulse check or an automatic alert of an irregular heart rate on a blood pressure monitor could mean the difference between early treatment and a life-altering stroke,” he warns.

Beyond the issue of detection, the review also emphasises the role of hypertension in the development of atrial fibrillation. Chronic high blood pressure can alter the structure and function of the heart, increasing the likelihood of abnormal electrical activity that leads to AF. This suggests that managing hypertension effectively not only reduces stroke risk directly but also prevents the onset of atrial fibrillation, thereby offering a dual protective effect against both cardiovascular and neurological complications.

Furthermore, the review highlights the growing body of evidence that connects atrial fibrillation not only to stroke but also to the development of dementia. The presence of silent or intermittent episodes of AF may contribute to subtle but cumulative damage to the brain over time. Given the rising prevalence of cognitive disorders and the ageing global population, early detection of atrial fibrillation has implications far beyond cardiovascular care. It could also serve as a crucial strategy in reducing the future burden of neurodegenerative disease.

In conclusion, the authors advocate integrating atrial fibrillation screening into standard hypertension assessments. With the availability of modern diagnostic tools—ranging from blood pressure monitors with arrhythmia alerts to portable ECG devices and smartwatches—there is little justification for maintaining the current separation of these two screening processes. “By incorporating atrial fibrillation screening into routine blood pressure screenings, we could identify at-risk patients earlier, start appropriate treatment, and save lives,” Niiranen asserts. The call to action is clear: tackling these two interlinked conditions offers a powerful opportunity to reduce preventable strokes and improve long-term health outcomes across populations.

More information: Teemu Niiranen et al, Hypertension and Atrial Fibrillation: A Frontier Review From the AF-SCREEN International Collaboration, Circulation. DOI: 10.1161/CIRCULATIONAHA.124.071047

Journal information: Circulation Provided by University of Turku

Diabetes Disrupts the Brain’s Memory and Reward Systems, Study Finds

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Groundbreaking research from the University of Nevada, Las Vegas (UNLV) has unveiled new insights into how Type 2 diabetes may disrupt brain function in ways that resemble the early stages of Alzheimer’s disease. Central to this revelation is the anterior cingulate cortex (ACC), a vital but previously underexplored region of the brain that appears to play a key role in how elevated blood sugar affects memory and motivation. The study identifies a significant neurological link between diabetes and cognitive decline, offering a fresh perspective on a longstanding medical mystery.

Diabetes is widely recognised as a metabolic disorder that affects how the body regulates blood sugar and insulin. Among individuals with Type 2 diabetes—the most prevalent form of the disease—there is a notably higher risk of developing psychiatric and neurodegenerative conditions, including a 65% increased chance of Alzheimer’s disease. Despite this correlation, the precise biological mechanisms bridging these two conditions have remained poorly understood. The UNLV research team, led by psychology professor James Hyman, set out to investigate this link by examining the impact of diabetes on brain regions associated with cognition and emotional regulation.

The anterior cingulate cortex, or ACC, is a structure within the brain’s frontal lobe and is known to mediate various essential cognitive and emotional processes. These include motivation, decision-making, learning, and the processing of rewards, as well as goal-oriented behaviour and emotional regulation. Its function is particularly relevant in mood disorders such as depression, which frequently co-occur with chronic diseases like diabetes. Despite its central role in these processes, the ACC has not previously been a significant focus on research exploring the neurological impact of diabetes.

In this study, published in the Journal of Neuroscience as part of a special issue on the computational properties of the prefrontal cortex, researchers used rodent models to explore how diabetes might interfere with ACC function. They observed that rodents with diabetes demonstrated altered reward-related behaviour. While they showed heightened anticipation for rewards such as sweet treats, they did not pause to savour the reward once received. Instead, they rapidly moved on to seek the next pleasurable stimulus. This pattern of behaviour, researchers suggest, reflects a breakdown in how the brain processes and encodes reward experiences—an impairment that mirrors early symptoms of Alzheimer’s disease.

Further investigation revealed that high blood sugar and insulin resistance—hallmarks of Type 2 diabetes—may weaken the ACC’s ability to integrate information from other brain regions. In particular, the researchers focused on its connection with the hippocampus, a region critical for spatial and autobiographical memory. According to Hyman, the hippocampus informs the brain about its location, while the ACC interprets what the individual is doing and whether they are receiving a reward. In healthy brains, this combined input creates a coherent and memorable experience. However, in diabetic brains, this neural synchrony appears disrupted, impairing memory and motivation.

This research builds on earlier work by the same team, which had already suggested a link between diabetes and cognitive impairment. What makes this study especially significant is its identification of a specific brain circuit—the hippocampus-ACC pathway—that may be vulnerable in both diabetes and Alzheimer’s. This finding opens potential avenues for targeted therapies that could slow or mitigate the neurological consequences of Type 2 diabetes. It also reinforces the importance of maintaining metabolic health, particularly through diet and lifestyle interventions, to protect cognitive function over time.

With Type 2 diabetes affecting over 90% of the global diabetic population and approximately one in ten people worldwide living with the disease, the study’s findings carry broad implications. Not only does it underscore the cognitive risks posed by chronic hyperglycaemia, but it also suggests that early interventions aimed at preserving ACC and hippocampal function could serve as a buffer against long-term brain damage. The dampening of reward signals observed in diabetic models also corresponds with symptoms of anhedonia—the inability to experience pleasure—a key feature of both depression and Alzheimer’s, further reinforcing the relevance of these findings to mental health.

Looking ahead, Hyman and his team plan to continue exploring the relationship between the ACC and hippocampus, particularly in the context of neurodegeneration. He notes that Alzheimer’s disease can remain undiagnosed for decades due to the brain’s capacity for compensation, meaning individuals may appear cognitively normal even while their neural processing is subtly changing. “We saw evidence of this compensatory behaviour even in our study,” Hyman said. “Understanding how and when these changes begin could be crucial for developing earlier and more effective interventions in both diabetes and Alzheimer’s disease.”

More information: James Hyman et al, ACC reward location information is carried by hippocampal theta synchrony and suppressed in a Type 2 Diabetes model, JNeurosci. DOI: 10.1523/JNEUROSCI.1546-24.2025

Journal information: JNeurosci Provided by University of Nevada, Las Vegas