Psychobiotics are intestinal bacteria with proven mental health benefits. Help reduce anxiety and depression with the right probiotics and prebiotic foods.
There’s a 3-pound part of you that affects your thoughts and feelings, and runs your life more than you would expect.
Surprisingly, it’s not your brain; it’s the total biomass of bacteria that lives in your intestines.
There’s new evidence that bacteria in the gut are integrally linked to the workings and the health of your brain.
Researchers are just beginning to understand how a class of probiotics called psychobiotics could be used to modify gut bacteria to alleviate anxiety, depression, and more.
This exciting new discovery is being called “the new frontier” in mental health treatments.
What Are Psychobiotics?
The term psychobiotics was first coined in 2013 by Ted Dinan, MD, Ph.D., a renowned authority on the microbiome. (1)
It sounds pretty high-tech but, in fact, the term is a twist on the more familiar probiotics — live microorganisms that are beneficial to health. (2)
Psychobiotics are probiotics that specifically bestow mental health benefits. (3)
More recently, the definition for psychobiotics has been expanded to include prebiotics which act as food for beneficial microorganisms, encouraging their growth.
How Psychobiotics Work: The Gut-Brain Connection
To fully understand how psychobiotics work, a little background on the connection between your gut and your brain is in order.
Your intestines have their own nervous system which has been called the “second brain” or “backup brain.”
Neurons are generally associated with the brain, but, surprisingly, your intestines contain 100 million of them. (4)
This is more than either your spinal cord or peripheral nervous system!
The English language is filled with terms that reflect the gut-brain connection — gut wrenching, gut instinct, gut feeling, and having butterflies in the stomach.
But it’s not just your intestines that have a two-way communication channel with your brain.
Strangely, the bacteria that live there do as well.
Each of us has a microbiome as unique as our fingerprints.
Virtually everything you do and everything that happens to you from the moment you’re born contributes to the creation of your unique gut flora profile.
Factors that impact your gut flora include your age, gender, lifestyle, geographic location, diet, stress, and antibiotic use. (7)
It’s estimated that a healthy gut should contain a ratio of about 85% “good” or “friendly” bacteria to 15% “bad” bacteria. (10)
When this ratio is out of balance, it results in a condition called dysbiosis.
Gut microbes may even play a role in personality.
Researchers have developed germ-free mice that are born with no gut bacteria and live in sterile environments.
When a germ-free mouse is exposed to the bacteria of a regular mouse, it adopts the personality of the new donor mouse! (14)
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6 Ways Psychobiotics Impact Brain Health and Function
Probiotics work in a wide variety of ways to improve overall health.
Related on Be Brain Fit —
How to Stimulate the Vagus Nerve: Boosting Mind-Body Health
But to qualify as a psychobiotic, a probiotic must specifically provide mental health benefits.
There are many existing theories on how psychobiotics affect the brain.
Here’s a look at the most likely mechanisms.
1. Psychobiotics Communicate Via the Vagus Nerve
The vagus nerve is the longest cranial nerve, relaying messages between the intestines and the brain while touching many organs in between.
It is thought to be a major way that psychobiotics exert influence on the brain. (17)
Dr. Ted Dinan’s research supports this.
He and his colleagues found that when mice were given the probiotic Lactobacillus rhamnosus, they showed fewer signs of stress, anxiety, and depression. (18)
But mice with a severed vagus nerve did not experience the same benefits.
2. Psychobiotics Synthesize Neurotransmitters
Neurotransmitters are chemicals that brain cells use to communicate with each other.
But neurotransmitters aren’t found only in the brain.
The gut’s enteric nervous system (ENS) uses and produces over 30 neurotransmitters. (19)
This enables the ENS to work on its own to control digestion — with no input from the brain.
The major brain chemicals serotonin, GABA, dopamine, acetylcholine, and norepinephrine have all been reported to be synthesized by gut microbes. (20)
Here’s a chart that shows some common gut bacteria and the neurotransmitters they create.
3. Psychobiotics Reduce Stress Hormones
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How to Reduce Cortisol, the Stress Hormone
Study participants who took a combination of Lactobacillus helveticus and Bifidobacterium longum for one month experienced a large drop in cortisol levels and significant improvement in mood. (28)
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4. Psychobiotics Quell Brain Inflammation
Inflammation is a natural healing mechanism.
But it can get stuck “on,” leading to inflammatory diseases like arthritis and allergies.
When chronic inflammation sets up in the brain, it can cause a host of brain-related disorders including depression. (29)
Good bacteria protect the brain from inflammation by keeping the levels of pro-inflammatory chemical messengers called cytokines in check.
High cytokine levels have been linked to mood disorders, depression, anxiety, memory loss, and cognitive disorders. (30)
5. Psychobiotics May Promote New Brain Cell Formation
Psychobiotics may work by increasing levels of brain-derived neurotrophic factor (BDNF).
This important brain protein has natural antidepressant properties and acts like fertilizer to stimulate the formation of new brain cells. (33)
So far, this effect has been observed only in lab animals and not in humans. (34)
6. Psychobiotics Protect the Brain from Damage
Lactobacilli and Bifidobacteria are two of the most prevalent groups of bacteria in your gut.
They are the mainstays in most probiotic supplements and occur in abundance in probiotic foods.
Some strains of Lactobacilli and Bifidobacteria act as antioxidants, protecting your brain cells from free radical damage. (35)
Additionally, good bacteria prevent the overgrowth of bad bacteria which create toxic byproducts called lipopolysaccharides.
- Lowering levels of the mood-enhancing neurotransmitters dopamine and serotonin
- Causing damage to the hippocampus, the area of the brain considered the seat of memory
- Contributing to short-term memory loss
- Increasing levels of the stress hormone cortisol
- Increasing inflammation, an underlying cause of depression
- Increasing free radical damage to brain cells
Evidence-Based Mental Health Benefits of Psychobiotics
The research on the potential benefits of psychobiotics is very promising.
There’s evidence that they can bring relief to some of the most common mental conditions of our times including anxiety, depression, and memory loss, as well as the effects of stress.
Here’s a sampling of research highlights on the benefits of psychobiotics.
A review of 38 studies found that probiotics effectively reduced symptoms of anxiety, depression, autism, and obsessive-compulsive disorder, while improving various kinds of memory. (37)
A meta analysis of 96 trials found that probiotics were associated with a significant reduction in depression. (38)
One bacteria, Bifidobacterium infantis, was found to alter levels of serotonin much like the antidepressant Prozac. (39)
A mix of Bifidobacterium and Lactobacillus species was found to reduce sadness, rumination, and aggressive thoughts. (40)
How to Optimize Your Mental Health with Psychobiotics
The evidence is clear that psychobiotics bestow numerous mental health benefits.
But determining which strains of probiotics are the best for the many brain disorders that exist is definitely a work in progress.
The general consensus among experts is that a lot more research is needed. (43)
So far, researchers have just scratched the surface.
Most studies use species of Bifidobacterium (B. longum, B. breve, or B. infantis) or Lactobacillus (L. helveticus or L. rhamnosus) bacteria.
This means there are still 1,000 additional species of bacteria to be considered!
Experts in the field believe that clinically tested psychobiotics won’t be available for at least another five years. (44)
So while your doctor won’t be prescribing psychobiotics anytime soon, there is still much you can do on your own to optimize your microbiome right now.
1. Take a Psychobiotic Supplement
You can take probiotic supplements that qualify as psychobiotic, but finding one that contains proven species can be a challenge.
Psychobiotics expert Dr. Ted Dinan warns consumers not to fall for false claims.
Discouragingly, he insists that few probiotics marketed as cognitive enhancers or mood boosters offer any real benefits. (45)
He reveals that most probiotic supplements are on the market because they are easy to manufacture, not because they are effective.
There are very few probiotic supplements developed specifically for mental health and not all strains used in studies are commercially available.
How to read a psychobiotic supplement label
The label below is from a supplement with some science behind it, Mood Probiotic by InnovixLabs.
It contains two species of probiotics, Lactobacillus helveticus and Bifidobacterium longum, which have been proven beneficial to mood.
Going one level deeper, notice the designations Rosell-52ND and Rosell-175.
These identify specific strains that are usually trademarked by the manufacturers.
When buying a psychobiotic, look at the colony forming unit (CFU) number.
This is the estimated number of live microbes in each serving.
These numbers are always extremely high, but you can expect that only one-third will typically survive.
2. Take a Probiotic Supplement for General Health
If you aren’t sure where to start, or aren’t sure you need a true psychobiotic, consider a probiotic that contains a variety of Lactobacillus and Bifidobacterium species.
These are the two best groups of probiotics that support both brain health and general health.
But do your homework before buying any probiotic supplements.
One study found that only one out of 17 probiotic products were accurately labeled. (46)
One reliable way to find quality supplements that contain these genera of bacteria is with LabDoor.com’s probiotic ranker.
LabDoor buys supplements off the shelf and then has them analyzed at independent labs.
You can easily find their highest ranking supplements in one or both of these probiotic health categories.
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3. Eat Probiotic Foods
There are several drawbacks to taking probiotic supplements.
There is no guarantee that they contain what is stated on the label.
There’s doubt whether these microbes make it alive past your highly acidic stomach.
And you don’t know if you’re getting the right ones for your needs.
Dr. Dinan emphatically states in his book The Psychobiotic Revolution: Mood, Food, and the New Science of the Gut-Brain Connection that “Eating the right kinds of foods has always been and still is the best way to achieve and maintain a healthy gut.”
Eating probiotic foods — foods that contain beneficial microbes — is the most sustainable way to increase your good gut bacteria.
Related on Be Brain Fit —
For tips on finding foods that contain beneficial live cultures, see the fermented foods section in 12 Brain Foods That Supercharge Your Memory, Focus & Mood.
Add these fermented foods to your diet to boost your friendly flora naturally:
Fermented dairy products
The most popular foods are yogurt and kefir.
Choose unsweetened, full-fat products that state that they contain live cultures.
Sugar negates probiotic effects and low-fat versions contain fewer good bacteria.
Fermented soy foods
Fermented soy foods include miso, tempeh, and tamari.
Stick with traditionally fermented products.
Some popular foods are pickles, sauerkraut, and kimchi.
Avoid vegetables soaked in vinegar.
Look for those that are traditionally fermented and labeled unpasteurized.
4. Eat Prebiotic Foods
Prebiotics are foods that contain insoluble fibers that “good” intestinal bacteria feed on.
Ingesting probiotics without them is like trying to grow flowers on concrete.
Some experts believe that prebiotics are even more important than probiotics for maintaining healthy microflora.
Prebiotics alone can reduce stress, anxiety, and depression. (49)
Unwisely, most of us grab unhealthy foods like pizza, chips, and ice cream as our comfort foods.
A smarter idea would be to grab foods high in probiotics or prebiotic fibers instead, such as making a yogurt “sundae” topped with a banana and dark chocolate chips.
- bamboo shoots
- black pepper
- dark chocolate
- fennel root
- Jerusalem artichokes
- legumes (especially lima beans and lentils)
- mustard greens
- yacón (a natural sweetener)
To learn more about incorporating both probiotics and prebiotic foods into your diet, find everything you need to know in neurologist Dr. David Perlmutter’s cutting-edge book Brain Maker: The Power of Gut Microbes to Heal and Protect Your Brain for Life.
5. Play in the Dirt
Not all beneficial bacteria enter by mouth.
Simply inhaling Mycobacterium vaccae, a bacteria found in soil, can improve your mood by stimulating the production of serotonin.
M. vaccae activates the same neurons in the brain as the antidepressant Prozac. (53)
6. Stop Killing Your Good Bacteria
Antibiotics are the biggest danger to your microbiome since they indiscriminately kill good bacteria along with the bad.
But less obvious factors such as stress, prescription medications, poor diet, sugar, alcohol, food emulsifiers, artificial sweeteners, chlorinated tap water, and the widespread use of antibacterial soap and hand sanitizers also contribute to the demise of good bacteria. (56, 57, 58)
Why We Must Rethink Our War on Bacteria
The use of antibiotics against infectious diseases is arguably the most important medical advance of all time.
But there’s a lot of evidence that we’ve gone too far.
Antibiotic overuse has made antibiotic-resistant bugs a frightening reality. (59)
An alarming 70% of all antibiotics are used in livestock feed. (60)
And our collective mental health may be suffering from it.
It’s time to stop our war on microbes and accept our evolutionary symbiotic relationship with them.
Bacteria have been found living in the most hostile environments on earth.
Live microbes were found trapped inside 50,000-year-old cave crystals in Mexico. (63)
They’ve even been found growing on the outside of the International Space Station! (64)
Bacteria are that ubiquitous and that tough.
And, without them, life as we know it could not exist.
In this engaging TED Talk, nutritionist, microbiologist and neuroscientist Ruairi Robertson explains that our gut bacteria are as naturally diverse as an Amazon rainforest.
Unfortunately, our war on bacteria has left our collective gut a barren wasteland instead.
Psychobiotics: Take the Next Step
Psychobiotics are at the frontier of advancement in mental health care.
These live bacteria can positively impact your brain health and function in an amazing variety of ways.
They may be the next generation of treatment for anxiety, depression, and other mental disorders.
But, in the meantime, you can optimize your intestinal microflora by eating a diet that contains both probiotics and prebiotic foods, and taking the right probiotic supplements.
Encouraging the growth of good gut bacteria may be one of the most important things you can do for your mental health.