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The study found that eating more fruits and vegetables increases gut microbiota, which can improve depression and anxiety.
According to foreign media reports, a medical research review points out thatimproving gut microbiota helps to control depression, the research found that probiotics and a balanced diet can improve anxiety symptoms, and increasing fruit and vegetable intake seems to be the best intervention method to increase the number of 'beneficial bacteria' in the gut.

Multiple studies have shown that mental health is related to gut microbiota, and this research conducted by Chinese scientists is one of the latest. Researchers from Shanghai Jiao Tong University School of Medicine reviewed a total of 21 studies involving 1,503 subjects. Among them, two-thirds (14 studies) used probiotics as an intervention method, while the remaining 7 studies approached from non-probiotic avenues, such as adjusting daily dietary habits. Many foods contain probiotics, such as kefir (a fermented drink), yogurt, German sauerkraut, miso, pickles, etc. There are also dietary supplements made from various probiotic strains.多种益生菌菌株制成的膳食补充剂.
In the total of 21 studies, 11 studies showed that regulating gut microbiota can have a positive effect on anxiety symptoms. In the 14 studies using probiotics as an intervention, more than one-third (36%) found that probiotics could effectively alleviate anxiety symptoms. In the other 7 studies that did not use probiotics, 6 studies found that the intervention methods were effective, with an effectiveness rate of up to 86%.
In these 21 studies, some attempted to treat anxiety in a conventional manner while improving gut microbiota, such as having patients take anti-anxiety medications. However, only in the studies that did not use probiotics did patients' symptoms improve, leading researchers to believe that improving gut microbiota without the aid of probiotics and ensuring a diverse food intake is more beneficial for the proliferation of gut microbiota.
An article published in the journal 'General Psychiatry' pointed out that further experiments are needed to confirm the above research conclusions. They also added: 'There are two types of intervention methods for regulating gut microbiota (probiotic and non-probiotic interventions). The conclusion should be quite clear: non-probiotic interventions are more effective than probiotic methods.'
In the 14 studies using probiotics, the types of probiotics used ranged from one to five. Researchers believe this may lead to conflicts between different probiotics, reducing treatment effectiveness, and it may take a long time for the required number of bacteria to significantly increase. The authors of this review acknowledge that their work has certain limitations, such as differences in study design, subjects, intervention methods, and measurement values. However, they stated that the quality of these studies is high and suggested considering alleviating anxiety symptoms by regulating gut microbiota.
There is evidence that trillions of bacteria in the gut can influence brain areas related to emotions through a communication pathway known as the 'gut-brain axis.' The physical and chemical connections between the gut and the brain, including hundreds of millions of nerves and neurons, can affect the roles played by these two organs. The close relationship between the two can explain why we immediately start secreting gastric acid when we see food or begin to eat, or why we feel nauseous when we are tense or anxious.
Most people feel anxious from time to time, but if this anxiety affects people's ability to live normally, it is considered a mental health issue. Physically, anxiety disorder patients often experience panic, sweating, teeth chattering, nausea, or dizziness. Anxiety disorder is the most common mental illness in the United States, affecting 40 million adults, and there are also 8.2 million anxiety disorder patients in the UK.

Common research on probiotics, gut interventions, anxiety symptoms, improvement, and impact on patients.
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