How to Enhance Your Gut Microbiome for Brain & Overall Health

Name: How to Enhance Your Gut Microbiome for Brain & Overall Health
Uploaded: 2022-02-28T13:00:00.000Z
Duration: 3 h 44 min 15 s

Introduction

In this section, Andrew Huberman introduces the topic of the gut-brain connection and how they influence each other. He also talks about the importance of maintaining gut health.

Gut-Brain Connection

The gut influences the brain through neurons and by changing the chemistry of the body.

The brain influences the entire digestive tract, including digestion speed and gut chemistry.

The gut microbiome strongly impacts metabolism, immune system, and brain function.

Importance of Gut Health

Maintaining good gut health is important for overall wellbeing at both a physical and mental level.

There are simple actionable things that can be done to optimize gut health in ways that improve nervous system functioning.

Sponsorship Message

In this section, Andrew Huberman thanks Athletic Greens for sponsoring the podcast and talks about why he uses their product.

Athletic Greens

Athletic Greens is an all-in-one vitamin mineral probiotic drink that covers foundational vitamin and mineral needs while containing high-quality probiotics and prebiotics.

It's useful for compensating for any deficiencies in diet or creating a healthy environment for your gut microbiome.

Special Offer

Listeners can go to athleticgreens.com/huberman to claim a special offer which includes five free travel packs and a year's supply of vitamin D3 K2.

LMNT Sponsorship Message

In this section, Andrew Huberman thanks LMNT for sponsoring the podcast.

LMNT Electrolyte Drink

LMNT is an electrolyte drink that contains no sugar but does contain sodium, magnesium, and potassium.

Sodium can be problematic for some people with hypertension or pre-hypertension.

Electrolytes and Gut-Brain Communication

In this section, the speaker talks about LMNT, a product that helps with electrolyte needs. The speaker also introduces InsideTracker, a personalized nutrition platform. The gut and brain are introduced as two-way communication systems.

LMNT and InsideTracker

LMNT is formulated to help anyone with their electrolyte needs.

InsideTracker is a personalized nutrition platform that analyzes data from your blood and DNA to help you better understand your body and reach your health goals.

With InsideTracker, they make everything very simple in terms of directing you towards particular protocols.

Gut-Brain Communication

Your gut is communicating all the time with your brain and vice versa.

The gut-brain axis includes different stations that communicate bidirectionally between the gut and brain.

When referring to the gut in the context of gut-brain signaling, it includes the entire digestive tract.

Neurons located all along your digestive tract communicate with your brain to impact what you think, feel, and do.

Central Nervous System

In this section, the speaker talks about the central nervous system (CNS), which includes the brain, spinal cord, and neural retinas.

CNS

The CNS includes the brain, spinal cord, and neural retinas.

Introduction to the Gut-Brain Axis

In this section, we learn about the components of the nervous system that reside outside the brain and spinal cord. We also get an introduction to the gut-brain axis and how it works.

The Components of the Nervous System

The peripheral nervous system is made up of nerve cells that reside in the gut and elsewhere in the body.

These nerve cells communicate with the brain and cross into the central nervous system to influence thoughts and feelings.

The gut is a component of the gut-brain axis, which includes all elements of digestion.

Structure of Digestive Tract

The digestive tract begins at your mouth and ends at your anus.

There are sphincters along its length that cut off certain chambers from others.

Variation in acidity gives rise to different microenvironments where particular microbiota can thrive or fail to thrive.

Certain behaviors and experiences adjust these microenvironments in ways that make particular bacteria more likely to thrive than others.

Importance of Digestive Tract Structure

The structure of digestive tract is important for gut-brain signaling.

Bumps and grooves along digestive tract are made up of mucosal lining with microvilli that push things along.

Microbiota reside everywhere along lumen starting at mouth all way through anus within niches where they grow best.

Definition of Terms

Microbiota refers to actual bacteria while microbiome refers to bacteria genes that impact us.

The Architecture of the Digestive Pathway

This section discusses the architecture of the digestive pathway and the trillions of microbacteria that live along it. It also explains how these microbacteria are constantly turning over in your gut, being born and dying off.

Microbacteria in the Gut

Microbacteria can remain stationary or move about, but they fill the entire lumen.

About 60% of stool is made up of live and dead microbacteria.

Our microbiome is also made up by microbacteria that access our digestive tract through our mouth, breathing, kissing, skin contact, and even animals we interact with.

Influences on Microbiome

What we eat strongly influences our microbiome but there are other factors such as who we interact with and the environment we're in.

Growing up in a home with animals or having social contact impacts your microbiome.

The Role of Microbiota in Digestion

This section explains how microbiota contribute to digestion by fermenting nutrients. It also discusses how what you eat can change enzymes produced by microbiota which help digest food.

Contribution to Digestion

Many genes that microbiota make are involved in fermentation and digestion of particular types of nutrients.

Lack of certain microbiota can lead to challenges digesting certain types of foods.

Impact on Brain Function

Microbiota change the way your brain functions by metabolizing neurotransmitters.

Certain microbiota present in your gut can improve or degrade your mood by facilitating the conversion of chemicals such as GABA.

The Influence of Microbiota on Brain Function

In this section, the speaker discusses how microbiota can influence brain function by producing neurochemicals.

Microbiota and Excitatory Neurons

Excitatory neurons release molecules like glutamate that can lead to seizures when there is runaway excitation.

Microbiota produce neurochemicals that can influence brain function, including the production of neurotransmitters like GABA, dopamine, and serotonin.

The Profound Influence of Gut Microbiota

Specific microbiota in the gut have a profound influence on immune system function, brain function, and digestion.

Communication Between the Microbiome and Nervous System

In this section, the speaker explains how neurons in the gut communicate with the rest of the nervous system.

Neurons in the Nervous System

Neurons are responsible for most nervous system functions.

Neurons are found throughout the body and connect to different organs and tissues.

Neurons in the Gut

There are neurons in the gut that pay attention to nutrients and microbiota.

These neurons send signals up to the brain through an axon pathway called vagus nerve.

Neuropod Cells

Neuropod cells are activated by sugar, fatty acids or amino acids present in food.

Neuropod cells collect information about the gut and send it to the brain through the vagus nerve.

The Vagus Nerve

In this section, the speaker explains how the vagus nerve works.

Anatomy of Neurons

Neurons have a cell body called soma that contains DNA and operating machinery.

Relevant neurons are located near the neck and send an axon process to the gut and another to the brain.

Vagus Nerve Pathway

Neuropod cells send signals up to the brain through a nerve pathway called vagus nerve.

The vagus nerve is part of the peripheral nervous system and connects to different organs in our body.

The Role of the Vagus Nerve in Gut-Brain Signaling

In this section, we learn about the many branches of the vagus nerve and how it plays a crucial role in gut-brain signaling. We also learn about neuropod cells and their ability to sense nutrients, particularly sugar, and send signals to the brain that trigger activation of other brain stations that cause us to seek out more of that particular food.

The Network of Neuropod Cells

The vagus nerve has many branches, not just to the gut.

There are also branches to other organs such as liver, lungs, heart, larynx, spleen etc.

Neuropod cells are part of a network that senses several different nutrients.

They send signals in the form of electrical firing up to the brain when they sense sugar.

These signals trigger activation of other brain stations that cause us to seek out more sugar.

Classic Experiments on Sweet Foods

Even if you bypass taste by infusing sweet liquid or putting sweet foods into the gut, people will seek out more of that particular food.

People have a selective preference for sweet foods even if they can't taste them.

Our experience and desire for particular foods has everything to do with how those foods taste as well as their texture and sensation in our mouth.

Neuropod cells signal through a branch of the vagus through nodose ganglion and various stations in the brain stem eventually causing release of neuromodulator dopamine.

Eliminating Activation of Neuropod Cells

Classic experiments involved subdiaphragmatic vagotomy which cuts off sweet sensing in the gut but still allows people to taste sweet foods with their mouth. This results in less active seeking out of sweet food.

Recent experiments involve selective silencing of neuropod cells which also results in less active seeking out of sweet food.

Neuromodulators such as dopamine impact motivation, craving and pursuit. They tend to put us into modes of action, not necessarily running and moving through space, but in the context of feeding.

Gut-Brain Signaling

In this section, we learn about the incredible system of gut-brain signaling and how it works. We also learn about the different components of gut-brain signaling and their timescales.

Neuropod Cells

Caused by sensations in your mouth and activation of neuropod cells

System that we know the most about at this point in time

Communicates with the brain through vagus nerve

Causes us to want to seek out a particular category of foods

Hormone Pathways

Slower than neuropod cells pathway

Nerve cells release hormones like CCK, glucagon-like peptide 1, PYY, etc.

Ghrelin increases with fasting and stimulates feeling of wanting to seek out food

Ghrelin system is not partial to seeking out specific types of food

Agitation caused by release of neuromodulator epinephrine which causes us to look around more, move around more, and seek out food

Parallel Pathways

Multiple accelerators and multiple brakes on a system

Always operating in parallel

Glucagon-Like Peptide 1 (GLP-1)

-[]( t = 00 : 38 : 06 s ) GLP-1 is made by neurons in the gut and by neurons in the brain

-[]( t = 00 : 38 : 19 s ) GLP-1 tends to inhibit feeding and tends to reduce appetite.

GLP-1 and Appetite Control

In this section, the speaker discusses how GLP-1 is used to reduce obesity and how it can be stimulated by certain foods and substances. The speaker also explains how GLP-1 reduces appetite by changing the activity of neurons in the hypothalamus.

Stimulating GLP-1 Release

Yerba mate tea can stimulate the release of GLP-1, which is often used as an appetite suppressant in South America.

Semaglutide is a prescription drug that stimulates GLP-1 release.

Certain foods such as nuts, avocados, eggs, high fiber complex grains can also stimulate GLP-1 release.

How GLP-1 Reduces Appetite

GLP-1 changes the activity of neurons in the hypothalamus that are involved in feeding behavior.

Gut-to-brain signaling mechanisms adjust appetite dependent on diet and constituents of diet.

Free Will and Hormones

-The speaker discusses how hormones in our gut influence our brain and decisions we make at a subconscious level.

-The speaker mentions Dr.Robert Sapolsky's argument that events happening within our body are actually changing the way our brain works leading to no free will.

Gut-Brain Communication

In this section, the speaker discusses how the gut and brain communicate with each other through chemical and mechanical signaling.

Chemical Signaling

The communication between the gut and brain is largely chemical.

Neurons in the gut communicate with the brain by way of electrical activity, which causes the release of chemicals like dopamine in the brain.

Hormones like neuropeptide Y, CCK, and ghrelin also signal chemically by affecting the chemical output of different cells.

Mechanical Signaling

Distension of the gut is registered by neurons that reside in your gut, which then signal up to your brain to suppress further consumption of food or fluid.

Information about gastric distress is communicated by mechanosensors that sense the mechanics of your gut and signal up to the brain.

Direct signaling from neurons in the gut communicates with neurons in the hypothalamus responsible for regulating feeding behavior.

Dopamine's Role

Dopamine is involved in both seeking out more food as well as vomiting.

Introduction

In this section, an introduction to how our bodies process food is given.

Food Processing

Our bodies break down food into nutrients that can be absorbed into our bloodstream.

These nutrients are used for energy or stored for later use.

Digestive System Anatomy

In this section, we learn about the anatomy of the digestive system.

Digestive System Anatomy

The digestive system consists of the mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus.

Each part of the digestive system has a specific function in breaking down food and absorbing nutrients.

Mouth and Esophagus

In this section, we learn about how food is broken down in the mouth and esophagus.

Mouth and Esophagus

Food is broken down mechanically by chewing and chemically by enzymes in saliva.

The tongue helps move food around in the mouth to aid in digestion.

The esophagus moves food from the mouth to the stomach through a series of muscular contractions called peristalsis.

Stomach

In this section, we learn about how food is broken down in the stomach.

Stomach

The stomach mixes food with acid and enzymes to break it down further.

This mixture is called chyme.

The stomach also regulates how quickly chyme enters the small intestine.

Small Intestine

In this section, we learn about how nutrients are absorbed into our bloodstream through the small intestine.

Small Intestine

Nutrients are absorbed into our bloodstream through tiny finger-like projections called villi that line the walls of the small intestine.

These nutrients are then transported to other parts of our body for energy or storage.

Large Intestine

In this section, we learn about how waste products are processed in the large intestine.

Large Intestine

Waste products from digestion are passed into the large intestine where water is absorbed back into the body.

The remaining waste is then eliminated through the rectum and anus.

Conclusion

In this section, the speaker concludes by summarizing how our bodies process food.

Food Processing Summary

Our bodies break down food into nutrients that can be absorbed into our bloodstream.

These nutrients are used for energy or stored for later use.

Each part of the digestive system has a specific function in breaking down food and absorbing nutrients.

Parkinson's, Dopamine and Neural Circuits

In this section, we learn about the relationship between Parkinson's disease, dopamine deficiency and neural circuits for movement. We also learn how drugs used to treat Parkinson's can cause activation of things like the trigger to vomit.

Parkinson's Disease and Dopamine Deficiency

Parkinson's is a deficiency in dopamine or a lack of dopamine neurons that causes a resting tremor and difficulty in movement.

Dopamine is associated with neural circuits for movement.

Drugs Used to Treat Parkinson's

Many drugs used to treat Parkinson's increase levels of dopamine so much that they can cause activation of things like the trigger to vomit.

This happens because these drugs activate dopamine receptors to such a great degree in certain areas of the brain.

The Gut-to-Brain Pathway

Neurons in our gut respond to nutrients but don't make decisions themselves.

The neurons communicate with areas of the brain not just that stimulate consuming more food but also with areas that when dopamine levels get too high, cause us to either stop eating or eject that food.

Our brain is sensitive to the amount of signaling coming from our gut not just the path by which that signal arrives.

Direct and Indirect Signaling

In this section, we learn about direct and indirect signaling pathways from the gut microbiome. We also learn how certain gut microbiota can synthesize neurotransmitters that can impact the brain.

Direct Signaling

Direct signaling pathways converge in the brain to create a particular feeling, thought, or behavior.

Neurotransmitters cause the activation or suppression of nerve activity by either electrically activating other nerve cells or causing other nerve cells to be less electrically active.

Indirect Signaling

The gut microbiota are capable of influencing metabolic events and in some cases are capable of synthesizing neurotransmitters themselves.

The foods you eat and the environment of your gut microbiome can actually create the chemical substrates that allow your brain to feel one way or the other, to seek out more of a particular type of behavior or to avoid that behavior.

Indirect signaling bridges us nicely from neuronal signals in the gut to the brain, hormonal signals from the gut to the brain, and includes the microbiome.

Gut Microbiota Synthesizing Neurotransmitters

In this section, we learn about how certain gut microbiota can synthesize neurotransmitters that can impact our brains.

Gut Microbiota Synthesizing Neurotransmitters

Certain gut microbiota can synthesize certain neurotransmitters that can go impact our brains.

For instance, bacillus and serratia can synthesize dopamine.

The Role of Gut Microbiota in Mood Regulation

In this section, the speaker discusses how gut microbiota can change our baseline levels of dopamine and serotonin, which are neuromodulators associated with mood regulation.

Baseline Levels of Dopamine

Baseline levels of dopamine act as the overall level or tide.

Peaks of dopamine are created by behaviors or ingestion of particular foods or drugs.

Bacillus and serratia tend to increase our baseline levels of dopamine.

Creating the right gut microbiome environment for these particular gut microbiota to thrive in elevates our baseline levels of dopamine, leading to enhancement of mood.

Baseline Levels of Serotonin

Candida, streptococus, and various enterococcus support the production or can even be metabolized into serotonin.

Serotonin is a neuromodulator associated with mood regulation and social interactions.

These gut microbiota when present and allowed to thrive in our gut will increase our overall levels of serotonin.

Individual events as we go about our day also influence levels of serotonin related to events at particular neural circuits in the brain.

Relationship between Gut Microbiota and Brain Circuits

Neurons in the brain are responsible for releasing serotonin directly in response to certain things like social touch or through other types of positive social experiences.

Gut microbiota that can literally be turned into dopamine raise our baseline levels of dopamine.

Lactobacillus or bifidobacterium give rise to increases in GABA levels, an inhibitory neurotransmitter that can act as a mild sedative reducing irritability.

The two things (gut and brain) act in concert; it is a powerful synergistic effect.

Importance Of A Healthy Gut Microbiome

Creating the correct environment for these gut microbiota to thrive really does enhance mood and wellbeing.

When our gut microbiome is not healthy, it can deplete our mood and sense of wellbeing.

The environment that we are exposed to in the first three years of life has a profound impact on the overall menu of microbiota that we will be able to carry within our body.

Getting exposure to and building a diverse microbiome in those first three years is critical.

Introduction to the Gut Microbiome

In this section, the speaker introduces the gut microbiome and explains how it is established in babies.

Establishment of Gut Microbiome in Babies

Babies do not get much exposure to microbiota inside of the womb.

The gut microbiome is established during birth and in the days and weeks immediately after birth.

Whether a baby is breastfed or bottle-fed, exposed to household pets, held by multiple caregivers or just one, contained in a restrictive environment as a preemie baby can all affect their gut microbiome diversity.

A diverse early-life gut microbiome is helpful for long-term outcomes such as brain-to-gut signaling, gut-to-brain signaling, and immune system health.

Antibiotics and Gut Microbiome Health

In this section, the speaker discusses how antibiotic treatment can be detrimental to establishing a healthy gut microbiome.

Impact of Antibiotic Treatment on Gut Microbiome Health

Studies show that if children are exposed to a lot of antibiotic treatment early in life, it can be very detrimental to establishing a healthy gut microbiome.

Reestablishing a healthy gut microbiome can help rescue some of those deficits caused by antibiotic treatment.

Doctors nowadays are more cautious about prescribing antibiotics to children up to three years old and extending out to five, seven, and ten years old. They should also be careful when prescribing antibiotics for adults due to the existence of antibiotic-resistant bacteria that can cause serious problems.

Role of Gut Microbiome on Brain Health

In this section, the speaker highlights studies emphasizing the key role of the gut microbiome on brain health.

Studies on Role of Gut Microbiome on Brain Health

The gut microbiome influences and creates neurotransmitters that can impact mood, mental health, and immune health.

There are hundreds if not thousands of studies emphasizing the key role of the microbiome on brain health, psychiatric health, etc.

Studies have shown that a particular gut microbiota called L. reuteri can correct social deficits in autism spectrum disorder models by way of activating the vagal nerve pathway that stimulates both dopamine release and oxytocin release.

Fecal Transplants for Colitis Treatment

In this section, the speaker discusses how fecal transplants were discovered to be effective in treating colitis.

Fecal Transplants for Colitis Treatment

Studies from the '50s showed that people with severe intractable colitis received fecal transplants from healthy individuals and saw significant improvement or rescue of their condition.

This discovery opened up an entire field of research into the potential impact of stool microbiota on human health.

Fecal Transplants and Microbiota

This section discusses the use of fecal transplants to treat metabolic conditions, particularly obesity. It also highlights the power of microbiota in shaping brain chemistry and mental health.

Fecal Transplants for Obesity

Fecal transplants involve transferring stool from individuals without a particular psychiatric or metabolic condition into those who have it.

These transplants have been successful in treating some cases of obesity where people cannot lose weight even with low-calorie diets or gastric bypass surgery.

The microbiota in these transplants can impact metabolism and neurotransmitters, leading to changes in behavior and food choices within the brain.

Positive and Negative Outcomes of Microbiota

Negative outcomes from fecal transplants underscore the power of microbiota in impacting bodily health.

Transfer of fecal matter from an obese donor can lead to the recipient developing metabolic syndrome due to their particular microbiota.

Microbiota can create positive outcomes such as enhancing microbial diversity, which is associated with lower incidence of loneliness.

Studies on Microbiome Diversity and Mental Health

A study found that enhanced microbial diversity was related to lower incidence of loneliness.

Another study correlated certain microbiota with feelings of subjective wellbeing and lack of depressive symptoms.

The Importance of a Healthy Microbiome

In this section, the speaker discusses the importance of having a healthy microbiome and how it can impact our mood and wellbeing. They also touch on the issue of excessive microbiota diversity.

What is a Healthy Microbiome?

A healthy microbiome is one that has a lot of diversity, including different types of bacteria.

It logically includes bacteria that produce GABA, dopamine, serotonin, support the immune system and do other things.

However, adding too much microbiota diversity can lead to brain fog states.

Probiotics and Prebiotics

Both probiotics and prebiotics can enhance microbiotal diversity and improve mood, digestion, immune system etc.

This has been established in post-antibiotic treatment or people recovering from illness or stress-related symptoms.

Excessive intake of probiotics can lead to brain fog states.

Improving Gut Microbiome

Everyone should be seeking to improve their gut microbiome because it impacts our brain and bodily health.

Stress negatively impacts the gut microbiome.

Long periods of fasts negatively impact the gut microbiome as many if not all need food to thrive.

Fiber Intake

Fiber is important due to prebiotic fiber which feeds the microbiome but low fiber diets such as ketogenic diets have anti-inflammatory effects and sometimes improve certain species.

Fasting & Probiotics

In this section, the speaker answers questions about fasting and probiotics.

Fasting

Certain cases show that fasting can be good for improving gut health.

However long periods of fasts negatively impact the gut microbiome as many if not all need food to thrive.

Probiotics

Certain cases show that probiotics can be good for improving gut health, especially when traveling or stressed.

However, it turns out that the particular bacteria in probiotics are not necessarily the ones that we want to have in our gut.

The Impact of Fasting and Diet on the Gut Microbiome

In this section, the speaker discusses how fasting and diet can impact the gut microbiome.

Fasting and its Effects on the Gut Microbiome

Intermittent fasting can cause a disruption to certain healthy elements of the gut microbiome.

During periods of fasting, especially prolonged periods of fasting, we actually start to digest away much of our digestive tract.

However, when people eat after a period of fast, there may be a compensatory proliferation or increase in healthy gut microbiota.

Diets and their Effects on the Gut Microbiome

A study carried out by Sonnenburg lab in collaboration with Chris Gardner's lab compared two general types of diets in humans: fiber-rich diets and diets enriched in low-sugar fermented foods.

Certain restriction diets or macronutrient-rich diets may not be good or bad for the microbiome.

Maintaining a healthy gut microbiome involves ingesting certain types of foods that enhance it.

Probiotics and Prebiotics

Ingestion of probiotics can be useful for improving microbiotal diversity.

Under normal conditions, one would focus on quality nutrients through diet and ingestion of probiotics at a fairly low to moderate level.

It might be useful to lean towards higher doses of prebiotics or probiotics than one might normally use under conditions where people are stressed or their system is generally stressed for environmental or illness-related reasons.

Supporting Overall Health

Getting deep sleep is one of the foundational things that really set us up for overall health.

Stress, Fiber and Fermented Foods

In this section, the speaker discusses how stress can disrupt the microbiome and explores a landmark study on the relationship between gut microbiome, food intake, and overall health. The study was conducted on humans who were instructed to increase either fiber or fermented foods in their diet.

Relationship between Stress and Microbiome

Limiting excessive, prolonged stressors is important for maintaining a healthy microbiome.

Stress can disrupt the microbiome whether or not you're fasting.

Landmark Study on Gut Microbiome

A landmark study explored the relationship between gut microbiome, food intake, and overall health.

Two major groups of humans were instructed to increase either fiber or fermented foods in their diet over a four-week ramp-up period.

Increasing fiber intake did not increase microbiota diversity as expected but increasing fermented food intake resulted in increased microbiota diversity and decreased inflammatory signals.

The number of servings of fermented foods was not as strong a predictor of improvements as was the duration of time that individuals were ingesting fermented foods.

Fermented Foods and Gut Health

In this section, the speaker discusses the benefits of consuming fermented foods for gut health. They also explain what types of fermented foods are best and how to consume them.

Benefits of Fermented Foods

Fermented foods can improve gut microbiome, brain-body health, and reduce inflammation.

Low-sugar fermented foods with live active cultures are best for gut health.

Brine from fermented foods contains a lot of active live cultures that can increase microbiota diversity.

Types of Fermented Foods

Examples of low-sugar fermented foods include plain yogurt, kimchi, sauerkraut, kefir, and natto.

It is important to choose fermented foods that you enjoy consuming in order to ingest enough throughout the day.

How to Consume Fermented Foods

The study recommends consuming six servings per day of low-sugar fermented food.

Spreading out consumption throughout the day can limit gastric distress.

Increasing intake of fiber through high-fiber diets did not have as positive an effect on microbiota diversity as consuming more fermented foods.

Fermented Foods and Gut Microbiome

In this section, the speaker discusses the benefits of fermented foods for gut microbiome health. They also provide tips on how to make your own fermented foods at home to save money.

Benefits of Fermented Foods

Fermented foods are beneficial for gut microbiome health.

Consuming more servings of fermented food per day is beneficial for gut microbiome health.

Making Your Own Sauerkraut

Making sauerkraut at home is a low-cost way to generate lots of fermented foods.

The best resource for making homemade sauerkraut is Tim Ferriss's book, "The 4-Hour Chef".

Follow a specific process to create large volumes of sauerkraut at home using a low-cost method.

Pay careful attention to the protocol when making sauerkraut at home.

Making Your Own Kombucha

To avoid the high cost of kombucha, you can get the scoby and make your own kombucha at home.

There are different protocols and recipes available online for making your own low-sugar fermented foods.

Pickles and Ferment

Jarred pickles rarely contain ferment. Look for containers that specifically mention fermentation.

Inflammation and Brain Health

When inflammation markers are kept in a healthy range, there's an active signaling of that immune system status to the brain.

Microglial cells communicate immune status to the brain.

When there's a lot of inflammation in the body, microglia can be hyperactivated and lead to cognitive defects or challenges thinking.

Limiting the number of inflammatory markers present in the body is important for gut-brain health.

The speaker provides tips on how to make your own fermented foods at home as a low-cost alternative to buying expensive fermented foods. They also discuss the benefits of consuming more servings of fermented food per day for gut microbiome health. Additionally, they touch on how inflammation affects brain health and provide insights into how microglial cells communicate immune status to the brain.

The Effects of Fiber and Artificial Sweeteners on the Gut Microbiome

In this section, the speaker discusses the effects of fiber and artificial sweeteners on the gut microbiome. He explains how increasing fiber intake can positively affect microbiome diversity and gut-brain function. Additionally, he touches on the controversy surrounding artificial sweeteners and their potential impact on the gut microbiome.

Increasing Fiber Intake

Gradually increasing fiber intake over a few weeks can have a positive effect on microbiome diversity and gut-brain function.

Eating more fibrous foods allows for an increase in enzymes that help digest fiber, indicating an enhanced capacity for the microbiome to degrade complex carbohydrates present in fibrous foods.

Controversy Surrounding Artificial Sweeteners

Studies in animal models have shown that large amounts of artificial sweeteners, such as saccharin or sucralose, can disrupt the gut microbiome.

There is no equivalent evidence in humans for these effects.

The topic of artificial sweeteners and their impact on the gut microbiome is controversial, with some studies showing negative effects while others show no significant impact.

Recent research has shown that neurons in the gut are capable of distinguishing between real sugars and artificial sweeteners. However, it is unclear how this relates to humans at this point in time.

Neuropod Cells' Response to Sugar vs. Artificial Sweetener

In this section, the speaker discusses recent research from Diego Bohorquez's lab regarding neuropod cells' response to sugar versus artificial sweetener. He explains how these cells signal information about sweetness to the brain and how their response differs between sugar and artificial sweeteners.

Neuropod Cells' Response to Sweetness

Neuropod cells in the gut are capable of distinguishing between real sugars and artificial sweeteners.

The same category of neurons can respond to both sugar and artificial sweeteners, but the pattern of signaling and signature pattern conveyed to the brain is different.

Neurons have incredible specificity in terms of what they signal from the gut to the brain. There may be a particular signal that the brain receives that says it is receiving some intake of food or drink that tastes sweet but doesn't actually offer many nutrients in the direction of sweetness, meaning that it doesn't have calories despite being sweet.

The Gut-Brain Axis: How the Microbiome Influences Mood and Health

In this section, we learn about the digestive pathway and how it harbors microbiotal species that signal to the brain and body. We also discuss direct and indirect pathways of signaling, healthy versus unhealthy microbiomes, and how fasting or restrictive diets may impact gut health.

Direct and Indirect Pathways of Signaling

Direct pathways are nerve networks that extend from the gut up to the brain and back to the gut.

Indirect pathways involve some of the gut microbiota synthesizing neurotransmitters that get out into the bloodstream, impacting immune system, getting into the brain as neurotransmitters.

These neurotransmitters act in the brain just as would neurotransmitters originating from within it.

Healthy vs Unhealthy Microbiomes

A diverse microbiome is healthier than a non-diverse one.

There are still questions about which microbiota species should be enhanced or suppressed in order to achieve optimal gut-brain axis function.

Impact of Fasting or Restrictive Diets on Gut Health

It's unclear how specific diets impact gut microbiome or whether they improve or degrade it.

Stress can disrupt gut microbiome while antibiotics can degrade it.

Prebiotics and Probiotics

High quality non-processed foods including prebiotic fiber and probiotics at not excessive levels will probably be healthy for most people.

High dose probiotics found in prescription form or capsule pill form are best reserved for cases where people are under severe chronic stress or have just come off a serious round of antibiotics.

Increasing the amount of fiber in your diet might be useful for increasing fiber digesting enzymes and the assimilation of fibrous foods.

Ingesting fermented foods can be immensely beneficial for reducing inflammatory markers in the body and improving microbiota diversity all along the gut, thereby improving signaling and outcomes along the gut-brain axis.

Making Your Own Fermented Foods

Making your own fermented foods at home can offset some of the costs while also being fun to do.

Fermented sauerkraut made at home can rival store-bought sauerkraut.

Conclusion

The gut microbiome is an incredible system that signals to the brain and other parts of the body through various pathways.

Understanding how it works can help improve our health and wellbeing.

Feedback, Supplements, and Sponsors

In this section, Andrew Huberman talks about how to give feedback on the podcast and suggests topics and guests for future episodes. He also discusses supplements and their quality issues. Finally, he mentions Thorne as a sponsor of the podcast.

Giving Feedback and Suggestions

To give feedback or suggest topics/guests for future episodes, leave a comment.

Check out the sponsors mentioned at the beginning of each episode to support the podcast.

The Huberman Lab Podcast has a Patreon page where you can support it at any level.

Supplements Quality Issues

Supplements' quality can vary tremendously due to lack of precision in putting different amounts of supplements in capsules/tablets listed on bottles.

Many people derive tremendous benefit from supplements.

Thorne as Sponsor

Thorne supplements have high degree of stringency in terms of quality ingredients and specificity of amounts listed on bottle.

You can get 20% off any Thorne supplement by going to thorne.com/u/huberman.

If you navigate deeper into the Thorne site, you can get 20% off any other supplement that Thorne makes.

Social Media and Newsletter

In this section, Andrew Huberman talks about his social media presence and newsletter.

Social Media Presence

Follow Huberman Lab on Instagram and Twitter for science-related tools that overlap with material covered on the podcast.

Neural Network Newsletter

Sign up for "Neural Network Newsletter" which is a completely zero-cost newsletter that comes out once a month by going to hubermanlab.com.