Health
New Study Links Obesity to Faster Progression of Alzheimer’s Disease
A new analysis presented in the United States suggests that routine blood tests could play a greater role in tracking Alzheimer’s disease, particularly among people living with obesity. The research, conducted by scientists at Washington University School of Medicine in St. Louis, indicates that obesity may accelerate the early biological changes associated with the condition.
The study, which will be shared at the annual meeting of the Radiological Society of North America, examined 407 adults over a five-year period. Participants underwent regular blood tests and PET scans, the latter measuring the buildup of amyloid plaques in the brain — a hallmark of Alzheimer’s disease. The blood tests assessed proteins and other biomarkers that are linked to cognitive decline.
Dr. Cyrus Raji, associate professor of radiology and neurology and one of the study’s authors, said this research marks the first time a clear relationship has been identified between obesity and Alzheimer’s progression using blood biomarker tests. He noted that blood results were able to detect obesity’s influence on Alzheimer’s-related changes more precisely than PET scans alone.
“The fact that we can track the predictive influence of obesity on rising blood biomarkers more sensitively than PET is what astonished me in this study,” Raji said.
According to the findings, people with obesity showed faster deterioration in several key biomarkers. The researchers reported a 24 per cent faster increase in the protein plasma NfL, which is associated with nerve damage. Levels of the blood biomarker plasma pTau217 rose 29 to 95 per cent faster in individuals with obesity, and amyloid plaque accumulation increased by 3.7 per cent.
Raji said these results may give doctors new ways to monitor how Alzheimer’s develops, especially as new treatments targeting amyloid buildup become more common. By using both blood tests and imaging, doctors may be able to gain a clearer picture of how the disease responds to medication.
“It’s marvellous that we have these blood biomarkers to track the molecular pathology of Alzheimer’s disease, and MRI scans to track additional evidence of brain degeneration and response to various treatments,” he noted.
Obesity has long been recognised as a risk factor for dementia. Individuals with obesity are more likely to experience conditions such as high blood pressure, type 2 diabetes, and reduced physical activity, all of which heighten the risk of cognitive decline.
Globally, around 57 million people are living with dementia, according to the World Health Organization. Alzheimer’s disease represents the largest share, accounting for between 60 and 70 per cent of all cases.
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
Europe Records Sharp Rise in Sexually Transmitted Infections, ECDC Warns
Health
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