Nearly one in seven people live with a mental health disorder, yet most still struggle to find effective care. Now, scientists at the University of South Australia believe the answer may lie in a surprising place—the gut.
Researchers at UniSA have reviewed growing evidence that the trillions of microbes in the digestive system can directly influence the brain, shaping mood, behaviour and even mental illness. Their findings strengthen the argument that changes in gut bacteria can alter brain chemistry, stress responses and overall wellbeing.
Lead author and PhD candidate, Srinivas Kamath, says this connection could reshape global mental health care. “The gut–brain connection is one of the most exciting frontiers in mental health research,” Kamath says. “We already know that the trillions of microbes in our digestive system talk to the brain through chemical and neural pathways, affecting our mood, stress levels and even cognition. But the big question is whether changes in gut bacteria actually drive mental illness or mirror what’s happening elsewhere in the body.”
The review found disrupted gut patterns in people with depression and schizophrenia. It also reported that early trials using probiotics, diet changes and faecal microbiota transplants led to improvements in mood and anxiety. Interestingly, psychiatric medications themselves appear to change the microbiome, showing just how intertwined the gut and brain are.
Globally, nearly 970 million people are affected by mental health disorders, with depression and anxiety ranking among the top causes of disability. Yet up to one-third of patients do not respond to existing treatments. The findings suggest that therapies focusing on gut health could offer new hope.
“There’s a growing awareness that lifestyle factors such as diet, stress, and environment can shape both gut bacteria and mental wellbeing,” says co-researcher Dr Paul Joyce. “If we can prove that gut bacteria play a direct role in mental illness, it could transform how we diagnose, treat, and even prevent these conditions. Microbiome-based therapies such as probiotics, prebiotics or tailored diets may offer accessible, safer, low-cost and culturally adaptable options that complement existing care.”
The researchers emphasise that future studies must be broader and longer-term, tracking gut changes across diverse populations to understand how diet, environment and culture shape this connection. “Clinical trials should move beyond small, short-term studies and instead test whether microbiome-based therapies can deliver lasting benefits, especially when combined with existing treatments,” Dr Joyce says.
He believes that by unlocking the gut’s role in mental health, researchers can help build practical, scalable tools for prevention and care. “Mental health doesn’t start and end in the brain. It’s a whole-body issue—and the gut may be the missing piece of the puzzle.”
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