Per researcher and scientists there is a connection between Gut (the second brain) and the Brain. In the book called The psychobiotic revolution by Scott C.Anderson with John F. Crayan, PH.D and Ted Dianan, MD, PH.D a four-pound population of microbes lives inside your intestines, and by adjusting the digestive bacteria not only you may help our mood and stress level but we also may treat Alzheimer's and Parkinson's and autism.
for example Probiotics that affect the brain are also called psychobiotics. Both probiotics and prebiotics have been shown to reduce levels of anxiety, stress and depression. or A number of foods such as oily fish, fermented foods and high-fiber foods may help increase the beneficial bacteria in your gut and improve brain health.
This groundbreaking medical narrative explain the research and the changes you can make to cultivate the healthiest internal microbiome and build a solid foundation for a happy life.
A few groups of foods are specifically beneficial for the gut-brain axis.
Here are some of the most important ones:
Omega-3 fats: These fats are found in oily fish and also in high quantities in the human brain. Studies in humans and animals show that omega-3s can increase good bacteria in the gut and reduce risk of brain disorders
Fermented foods: Yogurt, kefir, sauerkraut and cheese all contain healthy microbes such as lactic acid bacteria. Fermented foods have been shown to alter brain activity https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3839572/
High-fiber foods: Whole grains, nuts, seeds, fruits and vegetables all contain prebiotic fibers that are good for your gut bacteria. Prebiotics can reduce stress hormone in humans.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3839572/
Polyphenol-rich foods: Cocoa, green tea, olive oil and coffee all contain polyphenols, which are plant chemicals that are digested by your gut bacteria. Polyphenols increase healthy gut bacteria and may improve cognition (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4940121/)
Tryptophan-rich foods: Tryptophan is an amino acid that is converted into the neurotransmitter serotonin. Foods that are high in tryptophan include turkey, eggs and cheese.