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Over the past years, researchers have increasingly looked into the relationship between gut microbes and brain function, or the microbiota-gut-brain axis. With this interest in mind, some researchers have recently focused on fermented foods and their potential impact on mental health.

Fermented foods, including kimchi, sauerkraut, kefir, miso, tempeh and yogurt, have gained attention through social media for their distinct taste, but aside from that, it offers gut health benefits. 

In a recent study, researchers examined the diverse types of fermented foods, fermentation techniques, and their influence on the microbiota-gut-brain axis. 

Researchers highlighted the role of fermented foods in impacting the enteroendocrine system, which regulates hormones like ghrelin, neuropeptide-Y, GLP-1 and serotonin. These foods, rich in prebiotics and probiotics, have shown the potential to affect appetite regulation and mood.

The gut-brain connection

In a report, nutrition consultant, neuroscience professor and "Sugarless" author Dr. Nicole Avena emphasized the importance of the gut-brain axis. The gut hosts numerous bacterial strains influenced by various factors from birth to environmental exposures. Diet plays a crucial role in shaping gut flora diversity, impacting mental health. 

Similarly, medical doctor and "Eat to Beat Your Diet: Burn Fat, Heal Your Metabolism, and Live Longer" author Dr. William Li elaborated on the bidirectional communication between the gut and brain through nerves and circulation. Dysbiosis, an imbalance in gut microbiota, is associated with various neurological disorders, highlighting the significance of gut health in mental well-being.

Fermented foods contain bioactives, probiotics, and post-biotics that modulate gut microbiome activity, subsequently influencing brain pathways. These components contribute to a healthier gut ecosystem, potentially alleviating symptoms of depression, anxiety, and cognitive decline. However, further research is essential to elucidate the precise mechanisms and effects of fermented foods on mental health.