Health
Chinese Study Links Gut Bacterium to Higher Risk of Preterm Birth
A new study from China has identified a possible link between gut health and preterm birth, suggesting that the presence of a common bacterium in pregnant women could increase the risk of early delivery.
The research, published this week in the journal Cell Host & Microbe, focused on Clostridium innocuum (C. innocuum), a gut bacterium found to produce an enzyme capable of breaking down estradiol, a hormone essential for maintaining pregnancy. Women carrying the bacterium in their gut microbiome were found to face a higher likelihood of giving birth before 37 weeks of pregnancy.
“Preterm birth is a leading cause of death in newborns and children under five,” said An Pan, an epidemiology professor at Huazhong University of Science and Technology and one of the study’s authors. “This study suggests that for pregnant women or those preparing to conceive, monitoring the gut microbiome may help prevent potential adverse outcomes.”
Preterm birth and its risks
According to the World Health Organization (WHO), preterm birth remains a major global health issue, accounting for around 900,000 deaths in children under five in 2019 alone. Babies born before 37 weeks often face breathing difficulties, developmental delays, and higher risks of long-term disabilities, particularly if born before 32 weeks.
While known risk factors include infections, diabetes, multiple pregnancies, and genetic influences, many preterm births have no clear cause. The Chinese study suggests that gut bacteria may represent a previously overlooked factor.
How the study was conducted
Researchers analyzed data from two large cohorts of more than 5,000 women in early and mid-pregnancy across China. Stool and blood samples were collected to study microbial composition, genetic variation, and hormone metabolism.
The team identified 11 microbial groups linked to preterm birth, with C. innocuum showing the strongest association. Laboratory analysis revealed that the bacterium produces an enzyme that depletes estradiol levels, potentially disrupting pathways critical to sustaining pregnancy.
“Estradiol regulates processes that support pregnancy and trigger childbirth,” explained Zelei Miao, a co-author from Westlake University. “We propose that dysregulated estradiol levels caused by C. innocuum could explain the link between the gut microbiome and preterm birth.”
Broader implications and caveats
The findings could pave the way for new approaches to monitoring pregnancy health, potentially using microbiome testing to flag higher-risk cases. However, researchers cautioned that their study was limited to Chinese cohorts, where preterm birth rates are relatively low. Since the gut microbiome is influenced by diet, environment, and genetics, further studies are needed in more diverse populations to confirm the results.
Despite these limitations, experts say the research highlights the gut microbiome as a potentially modifiable factor in reducing preterm births worldwide—a condition that remains one of the most pressing challenges in maternal and child health.
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
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Health
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