Gut Bacteria and Mental Health: How Inflammation Affects Us: Thomas DeLauer

Published on July 14, 2017



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Gut Bacteria and Mental Health: How Inflammation Affects Us: Thomas DeLauer

Microbiomes are communities of microorganisms that are a combination of both beneficial and potentially harmful bacteria

Lifestyle factors such as exercise and managing stress appear to dramatically affect the diversity and quantity of healthy microbiome in the intestines

The human gut harbors over 100 trillion microorganisms – approximately 10 times the number of cells in the human body

Microbes begin residing within human intestines shortly after birth. These microbiomes are vital to the development of the immune system and various neural functions – known as the gut-brain axis

*The gut-brain axis is the biochemical signaling that takes place between the gastrointestinal tract and the central nervous system*

An increasing body of research results confirms the importance of the “gut-brain axis” for neurology and indicates that the triggers for a number of neurological diseases, specifically anxiety and depression, may be located in the digestive tract

How the Gut Interacts with the Brain

The gut is connected to the brain via the vagus nerve, the enteric nervous system, and the gut-brain axis.

Vagus Nerve

The vagus nerve extends from the brainstem down into the neck, thorax, and abdomen. The nerve exits the brainstem through rootlets in the medulla that are caudal to the rootlets for the ninth cranial nerve

The vagus nerve supplies motor parasympathetic fibers to all organs except adrenal glands, all the way from the neck down to the second segment of the transverse colon. It helps regulate heart rate, speech, sweating, and various gastrointestinal functions.

Enteric Nervous System

The enteric nervous system connects with the central nervous system. It contains 200-600 million neurons

Local and centrally projecting sensory neurons in the gut wall monitor mechanical conditions in the gut wall. Local circuit neurons, on the other hand, integrate this information.

This enables motor neurons to influence the activity of the smooth muscles in the gut wall and glandular secretions such as digestive enzymes, mucus, stomach acid, and bile

The enteric nervous system has been referred to as a “second brain” because of its ability to operate autonomously and communicate with the central nervous system through the parasympathetic (i.e., via the vagus nerve) and sympathetic nervous systems.

Gut-Brain Axis

Finally, the gut-brain axis consists of bidirectional communication between the central and the enteric nervous system, linking emotional and cognitive centers of the brain with peripheral intestinal functions.

There is strong evidence from animal studies that gut microorganisms can activate the vagus nerve and play a critical role in mediating effects on the brain and behavior. (1)

Connections between the gut and the brain/Anxiety and Depression

Recent studies on laboratory animals that grow up without any microorganisms (germ-free) show that microorganisms in the gut are capable of influencing mood

Maintaining a Healthy Gut

No one knows the exact ingredients for a healthy microbial gut; however, having a diet rich in probiotic foods to maintain a healthy gut seems like the way to go

Probiotics seemingly boost mood in two important ways:

They generate a particular neurotransmitter called gamma-aminobutyric acid (GABA) and also enhance the brain receptors for GABA as well.

GABA is calming amino acid, known to calm areas of the brain that are over active in anxiety and panic and in some forms of anxious depression.

References

1) Surprising Link Between Depression, Anxiety, and Gut Health. (n.d.). Retrieved from http://www.globalhealingcenter.com/natural-health/link-between-depression-anxiety-and-gut-health/

2) Link Found Between Gut Bacteria And Depression | IFLScience. (n.d.). Retrieved from http://www.iflscience.com/plants-and-animals/link-found-between-gut-bacteria-and-depression/

3) How Your Gut Affects Your Mood | FiveThirtyEight. (n.d.). Retrieved from https://fivethirtyeight.com/features/gut-week-gut-brain-axis-can-fixing-my-stomach-fix-me/

4) The Gut Microbiome, Anxiety and Depression. (n.d.). Retrieved from https://www.psychologytoday.com/blog/inner-source/201411/the-gut-microbiome-anxiety-and-depression-6-steps-take

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