Health
Study Finds Human Blood Cells Age Faster in Space
Human blood cells exposed to space conditions begin to lose their ability to generate healthy new cells and show signs of genetic damage, according to new research backed by NASA. The findings raise concerns about the biological toll of long-duration space travel and its potential impact on astronaut health.
The study, published in Cell Stem Cell, tracked changes in blood-forming stem cells during four SpaceX missions to the International Space Station (ISS). Researchers used haematopoietic stem and progenitor cells (HSPCs), which are crucial for producing blood and maintaining immune function.
When these cells spent 32 to 45 days in space, they began to display hallmarks of accelerated ageing. This included reduced capacity to generate healthy new cells, DNA damage, and shorter telomeres — protective caps on chromosomes that naturally shorten with age.
“Space is the ultimate stress test for the human body,” said Dr. Catriona Jamieson, study co-author and director of the Sanford Stem Cell Institute at the University of California San Diego. “Our findings show that the stressors of space — including microgravity and cosmic radiation — can accelerate the molecular ageing of blood stem cells.”
Using AI to Track Ageing in Space
The team used artificial intelligence-powered imaging tools to monitor cellular changes in real time during the missions. By studying HSPCs in microgravity, they were able to observe how quickly biological deterioration can occur outside Earth’s atmosphere.
Interestingly, some of the damage appeared to reverse when the cells were returned to Earth and placed in healthier environments. This suggests that while space accelerates cellular ageing, certain effects may be at least partially reversible.
Implications for Astronauts and Space Travel
The findings highlight the urgent need to develop countermeasures to protect astronauts as space agencies and private companies push for longer missions to the Moon, Mars, and beyond.
“Understanding these changes not only informs how we protect astronauts during long-duration missions but also helps us model human ageing and diseases like cancer here on Earth,” Jamieson noted.
The next phase of research will investigate whether similar molecular changes occur in astronauts themselves. Scientists hope to identify medical or genetic interventions that could mitigate the harmful effects of prolonged exposure to microgravity and cosmic radiation.
A New Era of Space Medicine
As commercial spaceflight expands and research in low Earth orbit grows, the health risks of space travel are becoming more pressing. The study suggests that prolonged stays in orbit could increase vulnerability to age-related conditions and weaken immune systems, underscoring the need for new medical strategies.
“This is essential knowledge as we enter a new era of commercial space travel,” Jamieson added. “Protecting human health in space will be as important as developing the technology to get us there.”
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
White House Rejects Report It Blocked Return of Ebola-Infected US Doctor
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