Could Eating More Fermented Foods Help Improve Mental Health?
Fermented foods like sauerkraut and kimchi are powerful allies to your mental health, courtesy of the neuroactive microbes and molecules they contain.1 Microbes and their metabolites, created during fermentation modulate the microbiota-gut-brain axis, which involves neural, immune, endocrine and metabolic pathways.2
Writing in Neuroscience & Biobehavioral Reviews, researchers with University College Cork (UCC) in Ireland and colleagues reasoned that fermented foods “offer an affordable dietary intervention strategy” for better mental health.3
Their review highlights how different types of fermented food not only have the potential to alter the makeup of microbiota in your gut but also influence the immune system and microbiota-gut-brain axis, with profound effects on your brain.
Fermentation — An Ancient Tool Valued for Modern-Day Mental Health
Many cultures around the world have relied on food fermentation since ancient times to increase the shelf-life of food. Fermentation also makes food more flavorful while helping to control potentially disease-causing microorganisms and improving foods’ digestibility.4
The process involves the conversion of carbohydrates into alcohol or organic acids using microorganisms like yeasts and bacteria under anaerobic conditions. This leads to the production of beneficial compounds now known to boost physical and mental health.
“Although ancient in origin, fermented foods are now seen as conduits for introducing beneficial microbes and molecules. Moreover, fermented foods are applicable therapeutics across various socioeconomic sectors given their potential affordability and cross-cultural accessibility,” the review explained.5
Fermented foods are rich in phytochemicals and microbe metabolites that include neurotransmitters and neuromodulators. These compounds stimulate pathways of the microbiota-gut-brain axis, including those of the immune system and neuroendocrine, enteric nervous and circulatory systems. When fermented foods are digested, they also produce compounds capable of modulating intestinal barrier and blood brain barrier permeability.6
Fermented foods may also help block dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis, the system responsible for the management of stress, which has also been linked to multiple neuropsychiatric disorders.7
Researchers with APC Microbiome Ireland at UCC previously investigated the influence of a psychobiotic diet on the microbial profile and mental health of 45 adults.8 Participants were randomized to eat either a psychobiotic diet or a control diet for four weeks. The psychobiotic diet included fruits and vegetables high in prebiotic fiber, including onions, leeks, cabbage, apples and bananas, along with fermented foods, such as sauerkraut and kefir.9
After four weeks, those following the psychobiotic diet had a reduction in perceived stress. Those who followed the psychobiotic diet the most had the greatest decreases in stress. Further, significant changes were found in 40 different chemicals, along with subtle changes in microbial makeup. Professor John Cryan, one of the study’s lead authors who also worked on the featured Neuroscience & Biobehavioral Reviews paper, said in a UCC news release:10
“Although the microbiome has been linked to stress and behavior previously, it was unclear if by feeding these microbes demonstratable effects could be seen. Our study provides one of the first data in the interaction between diet, microbiota and feelings of stress and mood.
Using microbiota targeted diets to positively modulate gut-brain communication holds possibilities for the reduction of stress and stress-associated disorders, but additional research is warranted to investigate underlying mechanisms.”
Virtually Any Fermented Food May Improve Brain Health
In the early stages of the research, study author Ramya Balasubramanian and colleagues compared sequencing data from more than 200 fermented foods in an effort to determine which are most beneficial for the brain. Nearly all of them showed promise, according to Balasubramanian, who said in a news release:11
“I expected only a few fermented foods would show up, but out of 200 fermented foods, almost all of them showed the ability to exert some sort of potential to improve gut and brain health … Fermented sugar-based products and fermented vegetable-based products are like winning the lottery when it comes to gut and brain health.
… For all that we see on sugar-based products being demonized, fermented sugar takes the raw sugar substrate, and it converts it into a plethora of metabolites that can h
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