20/06/2026 10:21 - Salud
Visualización científica del eje intestino-cerebro mostrando cómo las bacterias beneficiosas influyen en el sistema nervioso central, con representación de neurotransmisores y conexión neural
Science continues to reveal surprising links between our intestinal health and emotional well-being. A team of researchers from the Tata Medical Center in Kolkata, India conducted a pilot clinical trial demonstrating how probiotics can become a valuable ally in boosting conventional antidepressant treatments in older adults.
The study, published in the Journal of the American Geriatrics Society on June 19, 2026, represents a significant advance in understanding the gut-brain axis, a bidirectional connection that allows beneficial bacteria to directly influence our mood.
The scientific team designed a rigorous clinical trial with 58 participants, all over 60 years old and diagnosed with moderate depression. Volunteers were randomly divided into two groups:
Treatment duration was 12 weeks, followed by an additional 12-week follow-up period to evaluate whether benefits persisted over time.
| Parameter Evaluated | Probiotics Group | Placebo Group |
|---|---|---|
| Depressive symptoms reduction | Greater reduction | Standard reduction |
| Anxiety reduction | Greater reduction | Standard reduction |
| Quality of life | No significant differences | No significant differences |
Although both groups improved during the study (confirming the effectiveness of standard antidepressant treatment), the group receiving probiotics experienced a slightly greater reduction in both depressive symptoms and anxiety.
Probiotics are live microorganisms (usually beneficial bacteria) that, when consumed in adequate amounts, provide health benefits to the host.
Researchers used multiple tools to measure effectiveness:
The gut-brain axis is a bidirectional communication network connecting the enteric nervous system (in the gut) with the central nervous system. Intestinal bacteria can produce neurotransmitters such as serotonin and dopamine, fundamental for regulating mood.
According to researchers, this plausible biological mechanism explains why improving intestinal microbiota composition could translate into tangible emotional benefits.
Saibal Das, researcher at the National Institute of Bacterial Infections Research at the Indian Council of Medical Research, emphasized that the results are promising enough to justify a larger-scale clinical trial.
Abhinaba Ghosh, neuroscientist and co-author of the study, highlighted that the ultimate goal is to develop accessible healthcare solutions that can reach the general population and improve public health.
Researchers emphasize this is a small pilot study requiring confirmation through larger trials. Probiotics should be considered as a complement to conventional treatment, never as a substitute. Always consult a healthcare professional before incorporating supplements into any medical treatment.
Alfredo S. Quiroga
