Monthly Archives: February 2025

Climate Shift Tied to Higher Likelihood of Salmonella Incidents

Recent research from the University of Surrey has underscored the effects of climate change on the spread of Salmonella, building on prior findings that weather changes are catalysing the dissemination of severe diarrhoeal diseases.

The investigation, conducted by the University’s School of Veterinary Medicine, delved into the influence of various weather conditions on the transmission of Salmonella—a primary culprit behind foodborne illnesses in Europe, responsible for roughly one-third of such outbreaks.

Salmonella, a bacterial species notorious for causing food poisoning, thrives in the intestines of both animals and humans. It poses a risk of contaminating food through improper cooking or handling practices. The infection it triggers can lead to diarrhoea, fever, and abdominal cramps, with a higher incidence in regions lacking adequate sanitation and hygiene measures.

Published in the Journal of Infection, this study analysed data from the UK Health Security Agency detailing confirmed Salmonella cases in England and Wales from 2000 to 2016, juxtaposed with meteorological data from the Met Office for the same period. Researchers examined 14 distinct weather variables, offering a comprehensive view that considers the collective influence of these factors on Salmonella outbreaks. This approach allowed for a detailed assessment of the risks associated with salmonellosis based on local weather conditions in the days leading up to an outbreak.

The findings pointed to several key weather conditions linked to an uptick in Salmonella cases, regardless of geographic location. These included warmer temperatures (above 10 degrees Celsius), relative humidity, dewpoint temperatures ranging from 7 to 10 degrees Celsius, and prolonged daylight hours exceeding 12 to 15 hours. The relevance of these factors was further corroborated through data analysis from the Netherlands.

Dr Gianni Lo Iacono, Senior Lecturer in Biostatistics and Epidemiology at the University of Surrey, commented on the research’s implications: “The model employed for data analysis shows promise, as the results were consistent across England, Wales, and, independently, in the Netherlands, indicating its potential applicability in other European and high-income countries. This could pave the way for gaining new insights into Salmonella incidences and exploring its impact in diverse climatic and socio-economic settings, such as tropical countries.”

Dr Laura Gonzalez Villeta, the lead author and a university researcher, emphasised the significance of the study: “This research highlights the crucial role that weather conditions play in Salmonella outbreaks. It provides a valuable predictive tool that could aid in forecasting future risks and shaping targeted interventions, especially in the face of ongoing climate change.”

More information: Laura Gonzalez Villeta et al, Identifying key weather factors influencing human salmonellosis: A conditional incidence analysis in England, Wales, and the Netherlands, Journal of Infection. DOI: 10.1016/j.jinf.2025.106410

Journal information: Journal of Infection Provided by University of Surrey

Senior Citizens in England Report Increased Happiness Since Before the COVID Pandemic, According to Recent National Research

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The psychological state and well-being of older individuals in England have undergone significant transformations since the onset of the COVID-19 pandemic. This revelation comes from a comprehensive study that monitored the experiences of over 3,999 individuals aged 50 and above across 11 years, findings of which were published today in the peer-reviewed journal Aging and Mental Health. Spearheaded by a team from University College London (UCL), this research was supported by the National Institute of Ageing, a consortium of UK government departments coordinated by the National Institute for Health Research and the UKRI Economic and Social Research Council. This project extensively used data from the English Longitudinal Study of Ageing (ELSA) gathered between 2012 and 2023.

The study’s results were enlightening, particularly in the context of psychological well-being, as it charted a significant decline across several metrics in the latter half of 2020. Specific figures showed a 4% decrease in happiness, a 4% reduction in positive well-being, and a 7% drop in life satisfaction. However, a notable recovery was observed in the subsequent years (2021-2023), where metrics such as eudemonic well-being—which gauges the worthwhileness of one’s life—rebounded impressively, surpassing pre-pandemic levels. This pattern was similarly reflected in life satisfaction scores.

The types of well-being evaluated in the study include affective well-being (happiness), eudemonic well-being, and evaluative well-being (life satisfaction). However, the situation regarding depression is somewhat more intricate. During the pandemic, depression rates in older adults rose sharply from 11.4% to 27.2%. Although these figures dropped post-pandemic, they remained elevated at 14.9%, suggesting lingering psychological impacts. This sustained increase in depression rates could be attributed to ongoing pressures on the health service, which may have deterred or prevented individuals from seeking necessary psychological support.

Professor Paola Zaninotto, the study’s lead author and a Professor of Medical and Social Statistics at UCL’s Department of Epidemiology and Public Health, highlighted the profound effects of the pandemic on the well-being of older individuals in England. Despite the initial decline during the pandemic and a rise in depression cases, older adults have exhibited a noteworthy improvement in their overall happiness, life satisfaction, and sense of purpose compared to the pre-pandemic era. Professor Zaninotto suggests that these changes might be linked to a renewed appreciation for social connections, meaningful activities, and increased psychological resilience following adversity. The enhanced health security achieved through widespread vaccinations was also crucial in this positive shift.

The study also underscored significant differences based on age and socioeconomic status, indicating the need for tailored support policies to mitigate pandemics’ immediate and prolonged effects on older adults’ well-being. Notably, individuals in their 50s reported lower levels of positive well-being than older groups before the pandemic—an observation aligns with prior research suggesting that happiness tends to increase with age, particularly into the late 60s and early 70s. The challenges unique to the 50s demographic, such as financial responsibilities, caregiving roles, and work pressures, likely contribute to this trend. During the pandemic, while their happiness levels did not decline significantly, possibly due to already low well-being levels, they experienced more significant increases in depressive symptoms. However, this group also demonstrated considerable recovery post-pandemic, highlighting their resilience or adaptive capabilities.

Conversely, individuals over 75 experienced less improvement in depression and positive well-being post-pandemic, potentially due to more persistent vulnerabilities. This group might have engaged in less social interaction, faced more health limitations, or found it more challenging to adapt psychologically to the prolonged pandemic conditions.

The research also revealed that depression levels were consistently higher among less affluent individuals. However, during the pandemic, the more affluent participants experienced more significant declines in psychological well-being, possibly due to disruptions in their habitual lifestyles, such as travel, socialising, and dining out.

In conclusion, while the study pointed out a partial reduction in depression rates post-pandemic, it emphasised the ongoing need for mental health support, particularly for those most impacted. Professor Zaninotto’s team calls for policies that address both the immediate and long-term effects of the pandemic on mental health, highlighting the critical need for tailored support measures to manage these impacts on the older population comprehensively. The study’s strengths lie in its large, representative sample and robust methodology, which provided a consistent trajectory of well-being changes, reaffirming the interplay between positive psychological well-being, age, and socioeconomic status. However, it also faced limitations, including constraints on assessment protocols during the pandemic, which prevented using multi-item measures, potentially limiting the capture of positive psychology’s full complexity and nuances.

More information: Paola Zaninotto et al, Recovery of psychological wellbeing following the COVID-19 pandemic: a longitudinal analysis of the English longitudinal study of ageing, Aging & Mental Health. DOI: 10.1080/13607863.2025.2450260

Journal information: Aging & Mental Health Provided by Taylor & Francis Group

Extensive Research on Cannabis Reveals Effects on Working Memory

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A recent study published in JAMA Network Open investigates the effects of both recent and long-term cannabis use on brain function during cognitive tasks, focusing mainly on over 1,000 young adults aged between 22 and 36. Utilizing advanced brain imaging technology, the study meticulously recorded participants’ brain activity as they engaged in various cognitive challenges. The results showed a significant reduction in brain activity in 63% of heavy lifetime cannabis users and 68% of recent users during tasks that assess working memory. This decline in cerebral function was directly linked to poorer performance in working memory tasks, which are crucial for tasks such as following instructions or solving problems in one’s head.

The increasing global prevalence of cannabis use underscores the importance of such studies. According to Joshua Gowin, PhD, the lead author and an assistant professor of radiology at the University of Colorado School of Medicine, understanding the effects of cannabis is essential for enabling people to make informed decisions regarding its use. By comprehensively examining the impact of cannabis on various cognitive functions, the study aims to provide a balanced perspective on both the potential benefits and risks associated with cannabis consumption.

Participants in the study were categorized based on their cannabis usage: heavy users (over 1,000 times), moderate users (10 to 999 times), and non-users (less than 10 times). The researchers assessed the neural responses of these individuals using magnetic resonance imaging (MRI). At the same time, they performed seven cognitive tasks designed to test functions such as working memory, emotional response, and motor skills. The study found that cannabis has a statistically significant effect on brain function during working memory tasks, suggesting the observed impacts are unlikely to be coincidental. This effect was prevalent in recent and longtime users, although it was less significant in other cognitive tasks.

Dr. Gowin emphasized the rigorous standards employed in their research, mainly using false discovery rate (FDR) correction to minimize the risk of false positives across all seven cognitive tests. While some tasks indicated potential cognitive impairments, only the working memory tasks showed a statistically significant impact. This points to the need for a nuanced understanding of how different mental functions are affected by cannabis use.

Significantly, the study highlighted that heavy cannabis use tends to suppress activity in critical brain regions such as the dorsolateral prefrontal cortex, dorsomedial prefrontal cortex, and anterior insula, which are involved in key cognitive processes, including decision-making, memory, attention, and emotional regulation. However, Dr Gowin also noted that abstaining from cannabis before performing cognitive tasks could improve performance, advising that users need to be aware of their consumption patterns as sudden cessation could also disrupt cognitive function.

Dr Gowin concluded by advocating for further research to explore the direct impact of cannabis on brain function, the duration of these effects, and their implications across different age groups. He stressed the importance of extensive, long-term studies to deepen our understanding of the long-term effects of cannabis on cognitive health, thus paving the way for more informed public health policies and individual choices regarding cannabis use.

More information: Joshua Gowin et al, Brain Function Outcomes of Recent and Lifetime Cannabis Use, JAMA Network Open. DOI: 10.1001/jamanetworkopen.2024.57069

Journal information: JAMA Network Open Provided by University of Colorado Anschutz Medical Campus

Research Indicates that Rigorous Blood Pressure Management Lowers the Risk of Cognitive Decline

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A recent study conducted by researchers at Wake Forest University School of Medicine has revealed that just over three years of intensive blood pressure management can continue to significantly reduce the risk of mild cognitive impairment or dementia for an extended period, even after the cessation of treatment in adults who have hypertension and are at high cardiovascular risk.

The results of this study were published online in ‘Neurology’, the medical journal of the American Academy of Neurology. These findings underscore the long-term advantages of aggressive blood pressure control strategies in staving off cognitive deterioration. The research was supported by the National Institutes of Health and forms part of the Systolic Blood Pressure Intervention Trial (SPRINT) Memory and Cognition in Decreased Hypertension (SPRINT MIND) study, which included 9,361 participants aged 50 years or older from over 100 clinic sites across the United States and Puerto Rico. Participants were randomly assigned to one of two groups: one with a systolic blood pressure goal of less than 120 mm Hg (intensive treatment) and the other with a goal of less than 140 mm Hg (standard treatment).

Over a median follow-up period of seven years, participants underwent cognitive assessments in person and via telephone. They were subsequently classified as having no cognitive impairment, mild cognitive impairment, or probable dementia. David M. Reboussin, PhD, professor of biostatistics and data science at Wake Forest University School of Medicine and the corresponding author of the study, noted that those in the intensive treatment group exhibited a consistently lower incidence of developing cognitive impairment than those receiving standard treatment.

The research team specifically observed that participants receiving intensive treatment had a lower rate of mild cognitive impairment and a lower combined rate of mild cognitive impairment or probable dementia. This pivotal observation highlights the effectiveness of maintaining lower blood pressure targets for extended mental health benefits.

The groundbreaking SPRINT trial in 2015 demonstrated that intensive blood pressure management not only reduced cardiovascular disease but also lowered the risk of death by 30-40% among individuals with hypertension. The trial’s success in reducing cardiovascular risks led to its early termination. This meant that participants were under intensive blood pressure-lowering treatment for less time than originally intended, which initially made it challenging to accurately assess the impact of intensive blood pressure control on dementia cases.

However, initial findings from the SPRINT MIND study in 2019, led by the same institution, showed a significantly reduced risk of developing mild cognitive impairment up to five years following the initial intensive control period of 3.3 years. These latest findings from the SPRINT MIND study reaffirmed the previously observed significant reductions in rates of cognitive impairment, now observed over a more extended period—at least seven years. Jeff Williamson, M.D., M.H.S., professor of gerontology and geriatric medicine at Wake Forest University School of Medicine, emphasized the importance of this study’s results. He highlighted that intensive blood pressure control is a crucial strategy in preventing cognitive impairment, a primary cause of loss of independence among older adults. By lowering blood pressure to more aggressive targets, individuals with hypertension can improve their quality of life and prolong their active years.

More information: David M. Reboussin et al, Long-Term Effect of Intensive vs Standard Blood Pressure Control on Mild Cognitive Impairment and Probable Dementia in SPRINT, Neurology. DOI: 10.1212/WNL.0000000000213334

Journal information: Neurology Provided by Atrium Health Wake Forest Baptist

Sugary Drinks and Diabetes Risk: The Mediating Role of Gut Microbes

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It is widely recognised that the consumption of sugary drinks is linked to an increased risk of diabetes, although the exact pathways involved remain somewhat mysterious. Recent research published on January 31 in Cell Metabolism, a journal by Cell Press, has begun to shed light on this connection. The study reveals that metabolites, by-products produced by gut microbes, might play a crucial role in this process. This research was conducted among a long-term cohort of US Hispanic/Latino adults, and it identified notable differences in the gut microbiota and blood metabolites of individuals who regularly consume high amounts of sugar-sweetened beverages. Notably, those who frequently drank sugary beverages exhibited a metabolite profile that correlated with a heightened risk of developing diabetes over the following decade. This correlation suggests that the gut microbiome could be a key factor in mediating the relationship between sugary drink consumption and diabetes risk.

Senior author Qibin Qi, an Albert Einstein College of Medicine epidemiologist, explains that the study offers a possible mechanism to understand why sugar-sweetened beverages harm metabolism. While the findings are observational, they provide valuable insights that could inform strategies for diabetes prevention or management by targeting the gut microbiome. Qi’s comments highlight the significance of understanding how dietary choices impact our long-term health through complex biological processes.

Sugar-sweetened beverages are a primary source of added sugars in the American diet. Between 2017 and 2018, the average daily consumption of added sugars from beverages like sodas and sweetened fruit juices was approximately 34.8g per adult in the US. Qi highlights that sugars added in liquid form may be absorbed more readily by the body and provide a high energy density, consisting solely of sugar and water, which makes them particularly impactful on metabolism.

The research is pioneering in several ways. Previous studies in Europe and China have demonstrated that sugar-sweetened beverages can alter the composition of the gut microbiome. However, this is the first study to explore whether these microbial changes affect the host’s metabolism and diabetes risk, particularly within the Hispanic/Latino community in the US. This demographic is known not only for its high consumption of sugary beverages but also for its significant prevalence of diabetes.

The data for the study came from the Hispanic Community Health Study/Study of Latinos (HCHS/SOL), which includes over 16,000 participants residing in areas like San Diego, Chicago, Miami, and the Bronx. During their initial visit, participants provided diet details over the past 24 hours and supplied blood samples to analyse their serum metabolites. Additionally, faecal samples were collected and analysed to characterise the gut microbiomes of a subset of these participants (n=3,035) during a follow-up visit. This allowed the researchers to draw associations between sugar-sweetened beverage intake, gut microbiome composition, and serum metabolite profiles.

The findings indicated that consuming two or more sugary drinks daily was linked to changes in the abundance of nine specific bacterial species. Four of these species are known to produce short-chain fatty acids, beneficial compounds that result from the bacterial digestion of fibre and positively affect glucose metabolism. Generally, the bacterial species associated with high sugary beverage intake correlated with poorer metabolic traits. Interestingly, these bacteria were not linked to sugar consumed from non-beverage sources. Moreover, the study identified associations between the consumption of sugary drinks and 56 different serum metabolites, including several that are either produced directly by gut microbiota or are derivatives of such metabolites. These sugar-related metabolites were linked to worse metabolic indicators, such as increased levels of fasting blood glucose and insulin, higher body mass index (BMI) and waist-to-hip ratios, and reduced levels of high-density lipoprotein (HDL) cholesterol, which is considered “good” cholesterol. Significantly, higher levels of these metabolites were associated with an increased likelihood of developing diabetes over the next decade.

More information: Qibin Qi et al, Sugar-sweetened beverage intake, gut microbiota, circulating metabolites, and diabetes risk in Hispanic Community Health Study/Study of Latinos, Cell Metabolism. DOI: 10.1016/j.cmet.2024.12.004

Journal information: Cell Metabolism Provided by Cell Press

Understanding How the Brain Learns from Rewards Could Unlock New Treatments for Depression

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In a recent publication in the Journal of Affective Disorders, scientists Pearl Chiu and Brooks Casas from the Fralin Biomedical Research Institute at Virginia Tech have embarked on a study investigating how the brain’s mechanisms for reward learning could revolutionize the treatment of depression. The study focuses on a particular brain signal that activates in anticipation of rewards, which could be key to developing methods to help individuals overcome depression. Professors Chiu and Casas are at the forefront of this innovative approach, aiming to tailor depression therapies by examining how individuals process rewards and setbacks.

Their research, unveiled in January, delves into two specific brain signals: prediction error and expected value. These signals might enable predictions about the improvement of depressive symptoms in patients. This groundbreaking work is rooted in the understanding that significant depression, affecting over 21 million Americans annually, according to the Centers for Disease Control and Prevention, requires more than a one-size-fits-all treatment approach due to its complexity and the diverse ways it manifests in different individuals.

Professor Chiu explains that depression varies widely among individuals, particularly in how they learn from and respond to positive and negative events, often correlating with specific depressive symptoms. The team employs computational models to analyze how the reward-learning system of the brain operates in depressed individuals, particularly those experiencing anhedonia—a condition characterized by a diminished ability to experience pleasure. Their findings, which link specific brain activity patterns to potential recovery outcomes, suggest that these unique patterns could be pivotal in predicting who might recover from depression.

Chiu emphasizes that understanding the brain’s capacity to learn from various outcomes could lead to novel therapeutic approaches that utilize customized learning processes to adjust the brain’s reactions to these outcomes. The study identifies the brain signals of prediction error and expected value as crucial markers for determining the potential for recovery from depression. The expected value signal, indicative of the brain’s reward anticipation, consistently predicts remission across different treatment modalities. In contrast, the prediction error signal provides additional insights by highlighting the discrepancy between expected and actual outcomes, helping individuals adjust their behaviours accordingly.

This dual-signal approach enriches understanding of how distinct learning patterns can influence mental health outcomes, potentially leading to personalized, symptom-specific therapies. According to Professor Casas, these findings highlight the significant role of the brain’s reward system in predicting recovery, enabling the development of treatment plans that are aligned with each individual’s unique response patterns to rewards and setbacks.

Vansh Bansal, the study’s first author and a graduate student working with Chiu and Casas, notes that this research marks a significant step towards genuinely personalized mental health care. The team is actively applying these insights, having published related research in Clinical Psychological Science earlier in the year, which explored how reinforcement-learning techniques could influence behavioural changes in depressed individuals. They are now testing specific reinforcement-related questions that could alter how people with depression react to rewards and setbacks.

The overarching aim of this research is to move beyond mere symptom management by targeting the underlying brain processes that drive specific depressive symptoms. This approach promises more targeted interventions that offer lasting benefits by aligning therapeutic strategies with each individual’s unique brain responses. This innovative research signifies a significant advancement in integrating brain science with therapeutic practices, paving the way for more effective, personalized treatment methods. By comprehending how the brain’s reward system operates, the researchers are crafting strategies that could fundamentally transform care for depression by tackling its root causes rather than merely addressing its symptoms.

More information: Vansh Bansal et al, Reinforcement learning processes as forecasters of depression remission, Journal of Affective Disorders. DOI: 10.1016/j.jad.2024.09.066

Journal information: Journal of Affective Disorders Provided by Virginia Tech

Cystic Fibrosis Impairs the Immune System at an Early Stage

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Cystic fibrosis is a disease caused by inherited genetic mutations that disrupt or entirely stop the production of the CFTR protein. This condition primarily impacts the respiratory system, where mucus becomes so thick that it prevents pathogens like bacteria from being expelled through coughing, leading to a dangerous cycle of infection and inflammation.

To mitigate these effects, medical professionals have increasingly turned to CFTR modulator therapies in recent years. These treatments enhance the protein’s function, reducing mucus production and significantly improving the quality of life for those affected. Despite these advancements, clinical studies indicate that airway inflammation is still common, and in older patients, the deterioration of lung function continues unabated.

Ongoing research is dedicated to uncovering further processes involved in cystic fibrosis. Professor Nikolai Klymiuk from the Technical University of Munich, part of an international research team, has focused on how the immune system behaves in cystic fibrosis before the cycle of infection and inflammation begins. Their findings, published in Science Translational Medicine, reveal significant insights into the immune response associated with the disease.

The research team found that specific innate immune system cells in blood samples from children with cystic fibrosis and pigs with the same genetic defect are immature. This immaturity makes them less effective at fighting off bacteria. Additionally, pigs with cystic fibrosis also showed an increased number and significantly altered composition of immune cells in their lungs from birth. Given the strong resemblance between the immune systems of pigs and humans, these observations are likely applicable to human patients as well.

The researchers propose that these changes in the immune system may result from an “emergency program,” which prompts the body to produce many immune cells quickly and over a prolonged period. This leads to the formation of immature immune cells, which contribute to the fatal cycle of infections and inflammation characteristic of cystic fibrosis. Although these cells are present in the lungs, they are ineffective and damage lung tissue without preventing infections over the long term.

Professor Klymiuk, who specializes in Cardiovascular Translation in Large Animal Models at TUM, notes that while it remains unclear why such changes in immune cells occur, they are evident early in life and persist throughout the individual’s lifetime. Previously thought to result from frequent infections in adults, these altered immune cells are now understood to be a fundamental aspect of the disease from its onset. Professor Klymiuk believes that to enable people with cystic fibrosis to live without symptoms, a comprehensive approach to treating the disease is necessary. He hopes that the insights from their research will lead to a better understanding of the defective immune system and inform future treatment strategies.

More information: Nikolai Klymiuk et al, Perinatal dysfunction of innate immunity in cystic fibrosis, Science Translational Medicine. DOI: 10.1126/scitranslmed.adk9145

Journal information: Science Translational Medicine Provided by Technical University of Munich (TUM)

Research Identifies Optimal Workout for Individuals with Diabetes

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A study has unveiled the most effective forms of exercise for individuals with type-1 diabetes, shedding light on how different types of physical activity can help manage this condition. The research, conducted by the Universidade Federal do Vale do São Francisco in collaboration with Staffordshire University, focused on optimising training regimes for diabetic patients to understand how exercise can best control blood sugar levels without causing discomfort or demotivation. Dr Pooya Soltani from Staffordshire University highlighted the significance of the study, noting that patients with diabetes often struggle with motivation to exercise due to the fear of experiencing drops in blood sugar that can lead to discomfort.

To address this issue, the research team explored whether specific types of exercise could better regulate these blood sugar fluctuations. The study involved 19 individuals with type-1 diabetes who participated in two randomised trials to assess their glycemic and cardiovascular responses to different exercise modalities. Each participant engaged in a 30-minute session of moderate aerobic exercise on a treadmill, which included interval aerobic sessions consisting of alternating 1-minute intervals at 40% and 60% of estimated maximal oxygen consumption (VO2max) and continuous exercise at 50% of VO2max. Measurements of heart rate, blood pressure, and blood glucose levels were taken before, immediately after, and 20 minutes post-exercise. The researchers also evaluated participants’ rates of perceived exertion and enjoyment levels.

The results showed similar cardiovascular responses and enjoyment levels across genders and exercise types. However, notable differences were observed in the blood glucose responses, particularly between male and female participants, suggesting that gender-specific exercise recommendations may be necessary. The study found that men experienced more significant reductions in blood glucose levels immediately after both types of exercise sessions and 20 minutes after continuous aerobic exercise. In contrast, women showed decreased blood sugar levels only after constant exercise. These findings underscore the importance of considering gender-specific differences when prescribing exercise routines for patients with type-1 diabetes to prevent excessive drops in glucose levels, which can lead to episodes of hypoglycemia.

Dr Jorge Luiz de Brito-Gomes from the Universidade Federal do Vale do São Francisco elaborated on the practical applications of these findings. “For male patients, interval exercises such as short bursts of walking may be more beneficial when beginning exercise with lower blood sugar levels. On the other hand, continuous exercises like running might be better suited for those starting with higher blood sugar levels,” he stated. This tailored approach helps mitigate the risk of sudden blood sugar drops during exercise.

This groundbreaking study not only highlights the different impacts of exercise types on blood sugar levels among diabetic patients but also stresses the importance of personalised exercise plans based on individual health profiles and gender, aiming to enhance the effectiveness of physical activity as a component of diabetes management.

More information: Pooya Soltani et al, Sex-Related Glycemic and Cardiovascular Responses After Continuous and Interval Aerobic Sessions in Patients With Type 1 Diabetes: A Randomized Crossover Study, The American Journal of Cardiology. DOI: 10.1016/j.amjcard.2024.07.028

Journal information: The American Journal of Cardiology Provided by Staffordshire University

Consistent Dog Walking Enhances Mobility and Minimises Falls Among Elderly Adults

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Recent findings from The Irish Longitudinal Study on Ageing (TILDA) at Trinity College Dublin have underscored the advantages of frequent dog walking for older adults. Published in the Journals of Gerontology, the research indicates that seniors who walk their dogs at least four times a week benefit from improved mobility, reduced fear of falling, and fewer unexplained falls. This revelation sheds light on an area lacking extensive research, suggesting that dog walking could help prevent mobility issues and falls later in life.

The study aimed to evaluate whether regular dog walking correlates with a reduced likelihood of experiencing falls, a decreased fear of falling, and fewer mobility issues among a broad group of community-dwelling older individuals. Falls are the most common reason older adults end up in hospital and are the leading cause of accidental death in this age group. They are also strongly linked to serious injuries such as hip fractures, which can lead to a loss of independence, increased healthcare usage, admissions to nursing homes, and earlier mortality. With about 30% of Irish individuals aged 70 and over falling annually and one in eight needing emergency department services due to a fall, identifying effective preventive strategies is increasingly critical as the population ages.

The study’s methodology involved participants who were 60 years or older during the fifth wave of TILDA. Those who reported walking their dogs at least four days per week were classified as regular dog walkers. At the same time, the comparison group consisted of individuals who either did not own a dog or did not walk their dog regularly. Mobility was assessed using the Timed-Up-and-Go (TUG) test and falls, and fear of falling were self-reported. Logistic regression models evaluated the associations between regular dog walking and various health outcomes.

Key findings from the study included significant benefits for regular dog walkers: they completed the TUG test notably quicker than non-dog walkers, indicating a lower probability of falls. Additionally, they were 40% less likely to experience unexplained falls and 20% less likely to report fear of falling. These statistics highlight how regular dog walking can significantly enhance the mobility and safety of older adults.

The study highlights the physical benefits of regular dog walking and its role in promoting social interaction and mental well-being, which are essential for maintaining independence in old age. Professor Robert Briggs, a co-author of the study, emphasized the multifaceted benefits of dog walking, noting that the activity likely provides increased physical activity, social interaction, companionship, and a sense of purpose. Dr Eleanor Gallagher, the lead author, also pointed out the mental health benefits and increased confidence that regular dog walking can bring to older adults, making it a valuable activity for physical and psychological health later in life.

More information: Eleanor Gallagher et al, The Association of Regular Dog Walking with Mobility, Falls and Fear of Falling in Later Life, Journal of Gerontology. DOI: 10.1093/gerona/glaf010

Journal information: Journal of Gerontology Provided by Trinity College Dublin

Scientists Uncover How Tobacco Smoke Damages Key Immune Cells in the Lungs

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Cigarette smoking is a prevalent and lethal habit, yet our understanding of its role in causing severe respiratory diseases remains incomplete, hindering the development of effective treatments. A recent breakthrough by Australian scientists has shed light on how various chemicals in cigarette smoke and e-cigarettes impair the function of crucial immune cells in the lungs. Published on January 17 in the Journal of Experimental Medicine, the study demonstrates how these alterations increase the susceptibility of cigarette smokers, as well as those exposed to second-hand and third-hand smoke, to respiratory infections and exacerbate inflammatory diseases such as chronic obstructive pulmonary disease (COPD).

COPD, a condition exacerbated by smoking, is the third leading cause of death globally. Smokers with COPD are particularly vulnerable to influenza infections, which can further deteriorate their condition by increasing airway inflammation and promoting the destruction of lung tissue. Despite the severity of COPD, there are currently no effective treatments available. Dr Wael Awad, from Monash University’s Biomedicine Discovery Institute and the lead author of the study, stated, “Until now, the mechanisms by which cigarette smoke skews immune responses and their connection to smoke-related diseases like COPD have been poorly understood.”

The study was collaboratively led by notable scientists, including Professor Jamie Rossjohn and Professor David P. Fairlie, alongside Professor Alexandra J. Corbett and Professor Philip M. Hansbro. The team focused on the effects of cigarette smoke on mucosal-associated invariant T (MAIT) cells, which are vital in fighting bacterial and viral infections and can promote either inflammation or tissue repair. MAIT cells are activated by a protein called MR1, found in almost every cell of the body and present bacterial chemicals on the surface of infected cells to initiate an immune response.

Professor David P. Fairlie commented on the broader implications of smoke exposure, “While we are aware of the significant health risks from various smoke sources, our knowledge about how specific smoke components affect the immune system and impact different parts of the human body is surprisingly limited.” The researchers used computer modelling to identify which components of cigarette smoke could be recognized by MR1, finding several molecules that not only bound to the protein but also altered its expression on the surface of cells. These chemicals, including benzaldehyde derivatives used in flavourings for cigarettes and e-cigarettes, blocked the activation of human MAIT cells by bacterial compounds.

Further investigations involved studying the effects of cigarette smoke on MAIT cells obtained from human blood and mice. The findings revealed a reduction in MAIT cell function when exposed to cigarette smoke. Mice repeatedly exposed to smoke developed symptoms of lung disease, which worsened when the mice were also infected with influenza. Long-term exposure to cigarette smoke was found to alter the protective functions of MAIT cells in mice, increasing their susceptibility to influenza infections and the likelihood of developing COPD.

Professor Philip M. Hansbro provided insights on the protective effects in mice lacking MAIT cells, “Mice devoid of MAIT cells were also protected from COPD induced by cigarette smoke, showing reduced levels of lung inflammation and no tissue deterioration in their lungs.” The collective findings underscore the importance of understanding the biological mechanisms by which cigarette smoke influences immune function and lung health. This study not only highlights the intricate nature of immune responses to cigarette smoke but also opens avenues for potential therapeutic strategies to treat COPD and other related lung diseases.

More information: Wael Awad et al, Cigarette smoke components modulate the MR1–MAIT axis, Journal of Experimental Medicine. DOI: 10.1084/jem.20240896

Journal information: Journal of Experimental Medicine Provided by Rockefeller University Press

Limited Access to Air Conditioning Could Heighten Emergency Care Demands Due to Wildfire Smoke Exposure

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According to a recent study by the Boston University School of Public Health (BUSPH), individuals with restricted access to air conditioning are more likely to seek emergency medical treatment for health issues arising from exposure to wildfire smoke. The study, awaiting publication in the journal Environmental Research: Health, highlights the link between inhaling delicate particulate matter (PM2.5) from California’s wildfire smoke and an uptick in visits to emergency departments. These visits encompass various causes, with a notable emphasis on respiratory diseases, and display significant variations based on age and racial demographics. Notably, the risk escalates for those residing in zones where air conditioning systems are less prevalent.

This revelation is particularly timely, as firefighters are combating several wildfires across Southern California, including the Palisades fire, which has been described as the largest and most devastating in Los Angeles County’s history. In light of these ongoing wildfires, health officials advise locals who can safely stay in their homes to utilize air conditioners and air purifiers to mitigate the inhalation of smoke. Despite these recommendations, there has been scant research on how the availability of air conditioning might influence the health impacts of wildfire smoke, a gap this study seeks to fill.

Dr. Jennifer Stowell, the lead researcher and a climate and health scientist at BUSPH, emphasized the potential role of air conditioning systems in modifying the health outcomes of smoke exposure. The study primarily focuses on the likelihood of having access to air conditioning rather than the types of air conditioning systems or their actual usage. Dr Stowell notes that further research is critical as the frequency and intensity of wildfires increase due to climate change. This makes California a prime example with its expanding fire seasons and escalating fire severity. A crucial next step is enhancing our understanding of air conditioning access.

The research team utilized a comprehensive national healthcare database to examine over 50,000 emergency department visits during the California wildfire seasons from 2012 to 2019. They assessed the detrimental health effects of PM2.5 exposure on all participants and specific subgroups, establishing that exposure to wildfire smoke primarily leads to emergency visits for respiratory conditions. However, it does not significantly impact cardiovascular health. The findings indicated a heightened risk among children under 10, adults aged 20 to 74, and particularly within the Black community. However, increased rates were also observed among White, Hispanic, and Asian/Pacific Islander groups.

Individuals in areas with lower air conditioning availability faced a 22-percent increased risk of emergency department visits for respiratory issues linked to wildfire smoke. The study underlines the importance of understanding how air conditioners, which can serve as tools to filter pollutants, are accessed by various populations. This insight is vital as wildfires are expected to become more frequent, particularly in the Wildland-Urban Interface (WUI)—areas where human settlements meet dense vegetation, as is currently the case in Los Angeles County.

Dr Stowell also points out the specific dangers of WUI fires, which include the combustion of man-made materials and the resultant release of toxic chemicals. She discusses the current out-of-season fires in LA, driven by severe Santa Ana winds, as an example of how climate change could intensify such unusual weather patterns, leading to more frequent late-season fires.

Regarding residential air conditioning, the effectiveness of these systems in removing PM2.5 depends on the type of filters used. While HEPA filters can trap most particles larger than 0.3 µm, they are costlier compared to more standard options like fibreglass or generic pleated filters, which are less effective against finer particulate matter. Systems with a Minimum Efficiency Reporting Value (MERV) rating of seven or higher are deemed most effective but more expensive.

The implications of these findings are significant, prompting calls for more substantial policy initiatives to reduce health risks from wildfire smoke. Dr Stowell stresses the need for policymakers to improve public understanding of air filter types and ratings and suggests economic assistance for marginalized groups disproportionately affected by these health impacts. In response to the current wildfires, she advocates for proactive government measures to enhance emergency preparedness and policies to lessen exposure risks before such events occur. This comprehensive study sheds light on the acute challenges of wildfire smoke and charts a path forward for more resilient public health responses in smoke-prone regions.

More information: Jennifer Stowell et al, Emergency department visits in California associated with wildfire PM2.5: differing risk across individuals and communities, Environmental Research: Health. DOI: 10.1088/2752-5309/ad976d

Journal information: Environmental Research: Health Provided by Boston University School of Public Health

Combating Superbugs with a Dash of Turmeric

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In 2017, a heart-rending episode unfolded at a hospital in Nevada. A woman who had been admitted with pneumonia tragically lost her life due to multiple organ failure and sepsis. The cause of her death was traced back to a particularly tenacious strain of bacteria that was resistant to an astounding 26 different antibiotics. Such antibiotic-resistant bacteria, commonly known as superbugs, represent a grave threat to public health across the globe.

In response to this escalating challenge, a team of researchers from Texas A&M University has made significant progress in the fight against these lethal microbes. They have discovered that curcumin, the compound responsible for turmeric’s vivid yellow hue, might hold the key to mitigating antibiotic resistance. Their research, published in Scientific Reports, demonstrates that curcumin, when used as a nutrient for bacteria and activated by light, initiates harmful reactions within the bacteria, eventually leading to their death. This process reduces the prevalence of antibiotic-resistant strains and could restore the effectiveness of traditional antibiotics.

The historical context of this research highlights the transformative impact of antibiotics since their inception. Before the advent of these drugs, infectious diseases were a leading cause of death, significantly reducing life expectancy. The introduction of antibiotics dramatically extended the human lifespan by an average of 23 years. However, the recent decades have seen a plateau in discovering new antibiotics, during which antibiotic-resistant bacteria have become increasingly common. This has ushered in the era of superbugs — formidable pathogens like methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci, which are notoriously difficult to treat.

Dr. Vanderlei Bagnato, a professor in the Department of Biomedical Engineering at Texas A&M and the study’s senior author, referred to the growing prevalence of antibiotic resistance as an ‘antibiotic catastrophe.’ He emphasized the need for alternative strategies that can either eradicate superbugs or modify bacteria’s internal processes to make antibiotics more effective. The study seeks to reduce bacterial heterogeneity, which can lead to variations in how bacteria respond to antibiotics, thus directly contributing to treatment resistance.

The researchers employed a technique known as photodynamic inactivation, which uses light and photosensitizers to produce reactive oxygen species that kill microorganisms by disrupting their metabolic processes. In their experiments, curcumin served as the photosensitizer and was administered to strains of Staphylococcus aureus resistant to several antibiotics, including amoxicillin, erythromycin, and gentamicin. The bacteria were subjected to multiple cycles of light exposure, which reduced the concentration of antibiotics required to eliminate the bacteria compared to those that did not receive light exposure.

Dr. Vladislav Yakovlev, another contributor to the study and a professor in the Department of Biomedical Engineering, highlighted the broader implications of their findings. Photodynamic inactivation provides a cost-effective treatment option and can potentially reduce healthcare costs globally, including in the United States. It could be particularly beneficial in military medicine, offering a means to treat battlefield injuries and prevent the spread of antimicrobial resistance—a significant concern in combat situations. This innovative approach could revolutionize the treatment of infections resistant to conventional antibiotics, marking a significant step forward in the ongoing battle against superbugs.

More information: Jennifer Soares et al, Photodynamic inactivation and its effects on the heterogeneity of bacterial resistance, Scientific Reports. DOI: 10.1038/s41598-024-79743-y

Journal information: Scientific Reports Provided by Texas A&M University