By Ross Pelton, RPh, PhD, CCN
ABSTRACT: The Microbiome Theory of Aging (MTA) explains how microbial imbalance in the intestinal tract, which is also referred to as dysbiosis, causes health problems that accelerate biological aging. The underlying mechanisms involved include increased inflammation, elevated levels of zonulin, destruction of intestinal tight junctions, and intestinal permeability, which allow lipopolysaccharides (LPS) to leak into systemic circulation. LPS is a powerful endotoxin that causes chronic inflammation throughout the body. Chronic inflammation is associated with chronic diseases and the acceleration of biological aging. Postbiotic metabolites are compounds that are created by probiotic bacteria in the colon. Postbiotic metabolites have been called the new frontier in microbiome science due to their key roles in regulating the structure and function of the gut microbiome and many aspects of human health.
Revolutionary advancements in technology, especially next-generation gene sequencing (NGS) have resulted in a new understanding of the structure and function of the human gut microbiome, and its fundamental role in regulating health and aging.[1]
Microbiome Named #1 Game Changer to Transform Healthcare
The Cleveland Clinic is a highly respected medical institution. It was ranked the No. 2 hospital in the nation and the No. 1 hospital for heart care in U.S. News & World Report’s 2021-22 Best Hospitals rankings.[2]
In 2016, the Cleveland Clinic assembled a panel of top doctors and scientific researchers to create a list of medical innovations that they expect to be major game changers in the coming years. When the panel of medical and scientific experts announced their list of the Top 10 Medical Innovations that are most likely to transform healthcare in 2017 and beyond, topping the list as the #1 Game Changer expected to transform healthcare was: Using the Microbiome to Prevent, Diagnose and Treat Disease.[3]
A wide range of diet, lifestyle, and environmental factors influence the aging process and over time, numerous theories of aging have been proposed. The Microbiome Theory of Aging is not intended to dislodge or negate previous theories. The purpose of the Microbiome Theory of Aging is to emphasize the critical role that the gut microbiome plays in regulating many aspects of human health, which directly influence people’s rate of physical decline and biological aging.
The Gut-Immune System
From 70-80% of the immune cells in the human body are located in the gastrointestinal tract.[4] Many factors are capable of upsetting the microbial balance in the intestinal tract. Regardless of the cause, the Microbiome Theory of Aging explains how dysbiosis, which refers to microbial imbalance in the GI tract, causes changes that weakens the immune system, which then increases the likelihood of developing chronic degenerative diseases.
Studies have been published linking dysbiosis with virtually all chronic degenerative diseases, including inflammatory[5], metabolic[6], neurological[7], immunological[8], and cardiovascular diseases[9]. Although there is an association between dysbiosis and most of our common diseases, association is not causation. The purpose of this article is to discuss a fundamental mechanism that explains why dysbiosis is associated with the development of age-related diseases.
The Emergence of Microbiome Science
The first study with the term ‘microbiome’ in the title was published in April 2006.[10] Although microbiome science is a relatively new field of study, its critical importance in regulating human health is reflected in the amount of scientific research that is being conducted on the microbiome. Since April 2006, over 48,000 citations are indexed in PubMed with the term ‘microbiome’ in the title or abstract.
The Human Gut Microbiome
There are three main components in the gut microbiome ecosystem:
- The microbiota, which are the inhabitants of the gut microbiome: an estimated 100 trillion bacteria, but also viruses, yeast, fungi, and archaea.
- Epithelial cells, which are a single layer cells that line the gastrointestinal tract.
- The mucus layer, which forms a barrier that protects epithelial cells from exposure to bacteria and other harmful substances.[11] Over 99.9% of the bacteria in the gastrointestinal tract reside in outer mucosal layer in the colon.[12],[13]
If any of these parts of the microbiome ecosystem are damaged or dysfunctional, the resulting inflammation and intestinal permeability lead to a decline in immune function, the development of diseases and the acceleration of biological aging.
Postbiotic Metabolites
Postbiotic metabolites, which have been called The New Frontier in Microbiome Science,[14] are substance released by or produced through the metabolic activity of bacteria, which exert a beneficial effect on the host.[15]
A major paradigm in microbiome science is revolutionizing our understanding of how the gut microbiome functions and how it regulates health and aging. For decades, probiotic bacteria were thought to be the primary regulators of gastrointestinal health, but the mechanisms were not clearly understood. This mystery is being solved with the new understanding of the wide-ranging benefits of postbiotic metabolites. Postbiotic metabolites function in multiple ways to regulate the health of the microbiome ecosystem, and they also regulate many aspects of health throughout the body, including the immune system and the brain.
The Microbiome Theory of Aging explains how probiotic bacteria produce postbiotic metabolites, how various postbiotic metabolites regulate different aspects of health, and
what factors upset the microbial balance in the microbiome, resulting in changes that cause health problems and accelerate biological aging.
Consequences of Gut Microbiome Disruption
Gut microbiome dysfunction initiates the following cascade of events, which explain why intestinal dysbiosis and inflammation accelerate biological aging:
Dysbiosis causes intestinal inflammation, which elevates levels of zonulin, which degrade intestinal tight junctions, which causes intestinal permeability, which allow LPS to enter circulation and causes systemic inflammation, which suppresses the immune system and accelerates tissue damage, which increases the risk of developing chronic degenerative diseases, which accelerates aging.
Dysbiosis is a term that denotes microbial imbalance in the microbiome ecosystem. A healthy microbial balance in the gut microbiome consists of approximately 85-90% beneficial bacteria and only about 10-15% bad bacteria.[16] When levels of bad bacteria become elevated, intestinal inflammation develops.[17]
Many Causes of Dysbiosis
Many factors can contribute to microbiome malfunction however, the most common and most serious causes of microbiome dysfunction are, microbial imbalance[18], gluten-induced inflammation[19], antibiotics[20], poor diet[21], and stress.[22] Because these factors are so prevalent, it explains why microbiome dysfunction is a major factor that accelerates biological aging.
Antibiotics have saved millions of lives, but they can also have serious adverse effects. Antibiotics dramatically alter the bacterial composition of the gut microbiome in animals, children, and adults, which causes dysbiosis and often leads to additional health problems.[23] The overprescribing of antibiotics continues to be a major health problem.[24]
In addition to antibiotics, other classes of microbiome-disrupting drugs include oral contraceptives, NSAIDs, corticosteroids, antipsychotics, antacids, proton pump inhibitors, H2 receptor antagonists, statins, metformin, laxatives, opioids, and SSRI antidepressants.[25],[26]
Other factors can also have a detrimental effect on the gut microbiome such as C-section birth, lack of breastfeeding, poor sleep, sedentary lifestyle, stress, environmental toxins such as heavy metals and pesticides, and an unhealthy diet.[27],[28],[29],[30]
Stress & Microbiome Dysfunction
The gut-brain axis is a bidirectional “communication highway” that enables the gut and the brain to constantly communicate with each other. In the past few years, the mechanisms explaining how stress causes microbiome dysfunction and intestinal permeability have been elucidated. This directly links stress with microbiome dysfunction and accelerated aging.
The brain responds to chronic stress by releasing corticotropin-releasing factor (CRF), which binds to mast cells in the intestinal tract. Mast cell activation results in the release of protease enzymes, which degrade the epithelial tight junctions, resulting in intestinal permeability.[31] Thus, the brain-gut stress response helps explain why people with chronic stress such as PTSD and psychiatric disorders have high rates of intestinal permeability and damage to their gut microbiome.[32],[33]
Inflammation results from the same factors that cause dysbiosis: too many bad bacteria, gluten, antibiotics, poor diet, and stress. When either of these factors occur, the level of intestinal inflammation increases, which elevates levels of zonulin, which leads to intestinal permeability.[34]
Zonulin is a protein produced in the intestinal tract in response to inflammation that was discovered by Harvard pediatrician Alessio Fasano, MD. Fasano states that zonulin is “the only human protein discovered to date that is known to reversibly regulate intestinal permeability by modulating intercellular tight junctions.”[35] Zonulin disassembles or destroys tight junction proteins, which results in intestinal permeability or ‘leaky gut.” The discovery of zonulin explains how dysbiosis and inflammation cause intestinal permeability, which results in health problems and the acceleration of biological aging.
Tight Junctions are the spaces between the epithelial cells that line the intestinal tract. Proteins located on the surface of epithelial cells functionmetaphorically like Velcro.[36] The tight junction proteins “stick” together to form a semi-permeable barrier, which regulates the absorption of nutrients, water and other beneficial compounds while preventing pathogenic and/or inflammatory compounds from entering systemic circulation. Healthy tight junctions are critical for maintaining good health.
Intestinal permeability results when intestinal tight junctions are damaged or degraded, which enables unwanted, harmful substances, such as LPS, to leak into systemic circulation. An increasing amount of data is linking dysbiosis and intestinal permeability with a wide range of diseases and accelerated aging.[37],[38]
The Microbiome Diet: Dietary Fibers & Polyphenols:
There are two main categories of compounds in food that probiotic bacteria require to produce postbiotic metabolites: dietary fibers and polyphenols. Humans do not possess the enzymes needed to digest most types of dietary fibers and polyphenols. Hence, these compounds pass through the GI tract unchanged. However, when they reach the colon, they are the ‘food’ for the probiotic bacteria. Bacterial fermentation of non-digestible dietary fibers and polyphenols results in the production of a wide range of postbiotic metabolites with various types of biological activity.[39]
In The Brain-Gut Connection, world-renowned gastroenterologist, and microbiome scientist Emeran Mayer, makes the following statement: “Your bacteria use the information stored in their millions of genes to transform food into hundreds of thousands of metabolites.”
A review article published in 2002 reported that over 22,000 postbiotic metabolites have been identified in the scientific literature.[40] It is unrealistic to attempt to name and list the health-regulating effects of thousands of probiotic bacterial-produced postbiotic metabolites that been identified to date. However, here is list of the most researched and understood postbiotic metabolites to date, followed by a list of the known health-regulating effects of the best-known classes of postbiotic metabolites that intestinal bacteria are known to synthesize:
1.. Short-chain fatty acids (SCFAs): Acetic, propionic and butyric acids are a class of postbiotic metabolites that provide a wide range of health benefits.[41]
2.. Antimicrobial Peptides (AMPs) exert a wide range of inhibitory effects against pathogenic bacteria, fungi, parasites and viruses. AMPs range in size from 10-60 amino acids and currently 3,180 AMPS that have been identified and are listed in the Antimicrobial Peptide Database.[42],[43]
3.. Essential Nutrients produced by probiotic bacteria include B-vitamins (thiamine, riboflavin, nicotinic acid, pantothenic acid, pyridoxine, cobalamin, folic acid, and biotin), vitamin K, and various amino acids.[44],[45],[46]
4.. Neurotransmitters including GABA (gamma-aminobutyric acid), norepinephrine, and acetylcholine.[47]
5.. Antioxidants: Numerous strains of probiotic bacteria have been shown to produce metabolites with antioxidant activity, but these effects are highly strain specific.[48] A unique strain of probiotic bacteria named Lactobacillus fermentum ME-3 has been shown to synthesize substantial amounts of glutathione. Thus, glutathione is a postbiotic metabolite produced by L. fermentum ME-3. Glutathione’s multiple functions are so critical to health that it has been identified as a biomarker of aging.[49],[50] An article titled Lactobacillus fermentum ME-3: A Breakthrough in Glutathione Therapy was published in the Aug/Sep 2022 issue of IMCJ.[51]
6.. Exopolysaccharides (EPS): branched, long-chain sugar polymers produced primarily by lactic acid bacteria that exert a wide range beneficial properties.[52]
7.. Urolithins: Bioactive metabolites produced from bacterial metabolism of polyphenols.[53]
7.. Cell Wall Fragments contain substances that influence immune function(s).[54]
8.. Cell-Free Supernatant (CFS) is the liquid media in which bacterial cells were growing.[55]
Inflammation, Zonulin & Intestinal Permeability
Alessio Fasano, MD discovered zonulin, which is a protein that is produced by intestinal epithelial cells in response to inflammation. Zonulin disassembles intestinal tight junctions.[56] Thus far, zonulin is the only compound that has been discovered that has the capability to destroy intestinal tight junctions, which results in intestinal permeability.[57]
Dr. Fasano’s discovery is very important because it provides the mechanism that links dysbiosis and intestinal inflammation to intestinal permeability, the development chronic degenerative diseases, and accelerated aging.[58]
All Disease Begins in the Gut
Twenty-five hundred years ago, Hippocrates, who is called “The Father of Medicine,” is credited with saying, “All Disease Begins in the Gut.” There are a few exceptions to this rule (getting tetanus from stepping on a rusty nail, inhaling a toxic gas, being born with a genetic abnormality). Hence, it is more accurate to state, “Most Chronic Diseases Begin in the Gut.”
There are multiple factors that can trigger intestinal inflammation. However, according to Dr. Fasano, the two most powerful triggers for intestinal inflammation, which cause the elevation of zonulin, the destruction of intestinal tight junctions, and the development of intestinal permeability are gluten and microbial imbalance (too many “bad” bacteria).[59]
Zonulin is now recognized as a biomarker of aging. In elderly people, elevated levels of zonulin are associated with increased levels of inflammation, reduced muscle strength and increased frailty.[60]
The Microbiome Theory of Aging proposes that disruption of the gut microbiome is a primary cause of disease and accelerated aging. There is still much to learn, but the fundamental mechanisms that regulate this process are now understood.
It has been shown that bacterial imbalance/dysbiosis and intestinal inflammation cause the elevation of zonulin, which disassembles intestinal tight junctions, leading to Intestinal permeability. Each of these factors, which disrupt the gut microbiome, are associated with the major age-related diseases including cancers, cardiovascular, metabolic, neurological and inflammatory diseases.[61],[62],[63]
An individual’s diet is the most important factor that regulates the health of their gut microbiome.[64] If people don’t feed their probiotic bacteria well, they well not thrive and survive, and equally important, their bacteria will not be able to produce the postbiotic metabolites that regulate many aspects of health.
It was previously mentioned that the two primary food groups for probiotic bacteria are dietary fibers and polyphenols. The best sources of these ‘probiotic foods’ are fruits and vegetables. This explains why a plant-based diet is critical for microbiome health. Other types of foods such as whole grains, nuts, seeds, herbs, and spices also contain microbiome-supporting fibers and polyphenols.
Nutritional Disaster: The Malnourished Microbiome
Studies have reported that 90-95% of American children and adults do not meet the recommended intake of dietary fiber.[65],[66] Similar disparities have been reported regarding dietary polyphenols. Plant-based foods are the primary source of polyphenols. One study reported that 91% of American adults don’t consume adequate daily amounts of vegetables and 88% of adults don’t consume adequate amounts of fruits.[67] Data from 2005-2006 NHANES survey reported that 80% of Americans fall short fall short in the consumption of virtually every color category of polyphenol-containing foods.[68] The results of these studies are disturbing because they indicate that most people are likely to suffer from dysbiosis.
Frequency of Dysbiosis
The studies reviewed above reveal that most people are not consuming adequate amounts of the types of foods (fruits and vegetables) that are required support a healthy microbiome. The Standard American Diet, (also called the Western Diet), which is traditionally high in fat, sugar, and refined carbohydrates and low in fiber, induces unfavorable changes intestinal bacteria, which are associated with dysbiosis.[69]
Gastrointestinal complaints are one of the most common reasons people see their physician. Results from a large national survey reported that nearly two-thirds of Americans suffer from gastrointestinal symptoms.[70] Most Americans are not consuming adequate amounts of dietary fibers and polyphenols, which results in dysbiosis, a weakened immune system and increased risk of many diseases.
Inflammaging
Chronic inflammation is now recognized to be a fundamental cause of progressive decline in metabolic, physiological, and immunological function, which results in accelerated biological aging. The term inflammaging was created to address the fundamental link between inflammation and aging.[71] Learning how to prevent the inflammation that results from GI bacterial imbalance and intestinal dysbiosis is a key component in The Microbiome Theory of Aging.[72]
Lipopolysaccharides (LPS): A Biomarker of Aging
Lipopolysaccharides are part of the structure of the outer cell wall of gram-negative bacteria, which reside in the gastrointestinal tract of all humans. However, when dysbiosis, inflammation and intestinal permeability occur, LPS leaks into the body. When LPS enters systemic circulation, is a highly toxic substance that causes the release of pro-inflammatory markers in cells throughout the body.
In a double-blind, placebo-controlled, crossover human clinical trial, participants were administered either a low-dose of LPS or a placebo via intravenous infusion. The dose of LPS (0,6 ng/kg) was so low that the volunteers were not aware of any symptoms. Blood tests revealed that the people who received the low dose of LPS had a substantial increases in inflammatory markers (25-fold increase in TNF-alpha, a 100-fold increase in IL-6). They also had a 21% decrease in insulin sensitivity and a 32% increase in HOMO-IR, which is a marker of insulin resistance. This study reveals that low levels of LPS, which do not cause symptoms, are causing chronic inflammation, which is associated with accelerated aging.[73]
How to Create & Maintain a Healthy Microbiome
There are two requirements for a health microbiome:
- a diverse range of probiotic bacteria (the healthy human gut microbiome is estimated to contain from 500-1,000 species of bacteria[74])
- a diet that supplies a diverse range of fibers and polyphenols, which enables gut probiotic bacteria to produce a diverse range of postbiotic metabolites.
You CAN NOT create a healthy, diverse microbiome by taking commercial probiotics! When commercial probiotics are ingested, those bacteria generally do not colonize in the intestinal tract. Hence, ingested probiotics are limited in their ability to promote intestinal health and prevent disease.[75]
The ONLY way an individual can create a healthy, diverse microbiome is by consuming a diverse range of plant-based foods that provide a diverse range of dietary fibers and polyphenols. This supports the growth and proliferation of a diverse range of his/her own innate bacteria, which results in the production of a diverse range of postbiotic metabolites.[76]
This author has created an 8-minute YouTube video that teaches people a time-saving method to create a salad that contains 16 different kinds of fiber & polyphenol-rich vegetables that promotes a healthy gut microbiome. This video is titled: Ross’ Salad Buzz. It can be watched by searching for the terms ROSS SALAD BUZZ.
Healing the Gut Microbiome
Many people purchase commercial probiotics with the goal of reducing GI dysbiosis-related symptoms and improving their microbiome. As noted previously, studies report that from 90-95% of American children and adults do not consume adequate amounts of dietary fibers and polyphenols. In fact, Americans fall seriously short in both quantity and diversity of the foods that probiotic bacteria need. This raises the question of how much benefit people actually get when they ingest commercial probiotics.
Many companies that market probiotics have conducted studies which report that people who take their brand of probiotic gain various health benefits. However, other studies report that ingested probiotics generally do not colonize and remain in the body. Instead, they pass through and eliminated from the body in stools. In one meta-analysis of seven randomized, clinical trials (RCT), the authors reported finding, “a lack of evidence for an impact of probiotics on fecal microbiota composition in healthy adults.”[77]
The paradigm shift in microbiome science emphasizes that it is not the probiotic bacteria, but rather, postbiotic metabolites that are primarily responsible for regulating the health of the microbiome ecosystem and conferring health benefits to the host.
The Case Against High Dose Probiotics
Balance and diversity are important traits for the health of ecosystems. This holds true for the Amazon rain forest, coral reefs, and the human gut microbiome. Greater biodiversity equates to greater strength and resilience, and this is especially true for the human gut microbiome.[78]
People often think more is better. Consequently, we see commercial brands of probiotics with 50, 100 and 200 billion CFUs per dose. Taking a probiotic that contains a large amount of one or several strains of probiotic bacteria actually works AGAINST balance and diversity. Ingesting a high dose of one or several strains of probiotic bacteria may trigger the immune system to launch an alarm reaction.
Scientists in one study compared the immune responses after administration of a high dose and low dose Lactobacillus acidophilus. In their conclusion, the authors stated,
“Probiotics can be ineffective or even detrimental if not used
at the optimal dosage for the appropriate purposes.”[79]
Effectiveness of Probiotics vs Postbiotics
When probiotics are taken orally, those bacteria must survive the harsh acidic environment in the stomach. If they survive, when they reach the colon, they are likely entering into a hostile environment where the pH level is from 10 to 100 times too alkaline.[80] And, when they arrive in the colon, they must locate dietary fibers and/or polyphenols and begin the process of converting them into postbiotic metabolites. This all takes time.
Directly ingesting postbiotic metabolites is a much faster and more effective method of reducing symptoms of intestinal distress compared to ingesting probiotic bacteria. Postbiotic metabolites will IMMEDIATELY begin to reduce inflammation, kill pathogens, help restore the proper pH, enhance immune function, etc.
In The Gut-Immune Connection, Emeran Mayer, MD states the following:
“Taking the popular and highly advertised short cut of popping
a daily supplement pill containing billions of colony-forming units (CFUs)
will not do the job.”[81]
Commercialization of Postbiotic Metabolites
Interest in postbiotics is growing rapidly because they provide a wide range of health benefits and consequently, they have been called the new frontier in microbiome science.[82]
The pharmaceutical, food, cosmetic, and the natural products industry are increasingly focusing on the development of products containing postbiotic metabolites for several reasons. Postbiotic metabolites are safer to administer than live bacteria and they are more stable and have longer shelf lives.[83]
Although numerous companies have begun marketing products with the term ‘postbiotic metabolites’ or ‘postbiotics’ on the label, most of these products contain probiotics with just one or several postbiotic metabolites included in the formulation.
Multi-Year Fermentation Processes
Iichiroh Ohhira was a world-renown microbiologist who developed a multi-year fermentation manufacturing process that results in the production of over 500 hundred postbiotic metabolites. The manufacturing process that Dr. Ohhira created mimics the fermentation processes that take place in the human digestive tract to produce postbiotic metabolites.
Cell culture studies and animal and human clinical trials have been published, which reveal that oral ingestion of Dr. Ohhira’s Probiotics with over 500 hundred postbiotic metabolites provides a wide range of health benefits. A detailed explanation of Dr. Ohhira’s multi-year fermentation process is available in a booklet titled Dr. Ohhira’s Probiotics & Postbiotic Metabolites, which is availablefrom the following link: www.naturalpharmacist.net/ohhirabook
Postbiotic metabolites are the new frontier in microbiome science. The ‘industry’ of postbiotic metabolites is in its infancy and much research still needs to be done. However, there is hope that postbiotic metabolites will be therapeutically useful to improve microbiome health, improve overall health, and slow down the process of biological aging, thereby facilitating increases in lifespan and healthspan.
REFERENCES:
[1] Kim M and Benayoun BA. The microbiome: An emerging key player in aging and longevity. Transl Med Aging. 2020;4:103-116.
[2] Cleveland Clinic Newsroom report: https://newsroom.clevelandclinic.org/2021/07/27/cleveland-clinic-named-no-2-hospital-in-nation-and-no-1-hospital-for-heart-care-by-u-s-news-world-report-3/
[3] https://newsroom.clevelandclinic.org/2016/10/26/cleveland-clinic-unveils-top-10-medical-innovations-likley-game-changers/
[4] Mowat, A. M. & Agace, W. W. Regional specialization within the intestinal immune system. Nat. Rev. Immunol. 14, 667–685 (2014).
[5] De Oliveira, GLV, et al. Intestinal Dysbiosis in Inflammatory Diseases. Front Immunol. 2021 Jul 30;12:727485.
[6] Bandopadhyay P and Ganguly D. Gut dysbiosis and metabolic diseases. Prog Mol Biol Transl Sci. 2022;191(1):153.174.
[7] Holmes A, et al. Gut dysbiosis and age-related neurological diseases; an innovative approach for therapeutic interventions. Transl Res. 2020 Dec;226:39-56.
[8] Levy M, et al. Dysbiosis and the immune system. Nat Rev Immunol. 2017 Arp;17(4):219-232.
[9] Lau K, et al. Bridging the Gap between Gut Microbial Dysbiosis and Cardiovascular Diseases. Nutrients. 2017 Aug 10;9(8):859.
[10] Ordovas JM and Mooser V. Metagenomics: the role of the microbiome in cardiovascular diseases. Curr Opin Lipidol. 2006 Apr;17(2):157-61.
[11] Vancamelbeke M and Vermeire S. The intestinal barrier: a fundamental role in health and disease. Expert Rev Gastroenterol Hepatol.
[12] Larsson ME, et al. The two mucus layers of colon are organized by the MUC2 mucin, whereas the outer layer is a legislator of host-microbial interactions. Prooc Natl Acad Sci USA. 2011 Mar 15;108 Suppl 1(Suppl 1):4659-65.
[13] Cani P. Human gut microbiome: hopes, threats and promises. Gut. 2018;67(9):1716-1725.
[14] Pelton R. Postbiotic Metabolites: The New Frontier in Microbiome Science. Townsend Letter. 2022 Dec 18:
[15] Tsilingiri, K.; Rescigno, M. Postbiotics: What else? Benef. Microbes 2013, 4, 101–107.
[16] Nutritional Society of Malaysia: Probiotics Education Program. https://nutriweb.org.my/probiotics/3-1.html
[17] Hiippala K, et al. The Potential of Gut Commensals in Reinforcing Intestinal Barrier Function and Alleviating Inflammation. Nutrients. 2018, 10(8), 988;
[18] Yang Y and Jobin C. Microbial imbalance and intestinal pathologies: connections and contributions. Dis Model Mech. 2014 Oct;7(10):1131-42.
[19] Waszczuk E and Waszczuk K. Gluten, Dysbiosis, and Genetics in Celiac Disease: All Are Important. Dig Dis Sci. 2016 Set;61(9):2761-2.
[20] Duan H, et al. Antibiotic-induced gut dysbiosis and barrier disruption and the potential protective strategies. Crit Rev Food Sci Nutr. 2022;62(6):1427-1452.
[21] Sonnenburg ED, Sonnenburg JL. Starving Our Microbial Self: The Deleterious Consequences of a Diet Deficient in Microbiota-Accessible Carbohydrates. Cell Metab (2014) 20:779–86.
[22] Ilcumann-Diounou H and Menard S. Psychological Stress, Intestinal Barrier Dysfunctions, and Autoimmune Disorders: An Overview. Front Immunol. 2020 Aug 25;11:1823.
[23] Neuman H, et al. Antibiotics in early life: dysbiosis and the damage done. FEMS Microbiol Rev. 2018 Jul;42(4):489-499.
[24] Ferrara B, et al. Antibiotic overprescribing: Still a major concern. J Fam Pract. 2017 Dec;66(12):730-736.
[25] Pelton R, et al. The Drug-Induced Nutrient Depletion Handbook. Lexi-Comp. 2001, 2nd edition. Lexi-Comp, Hudson, Ohio.
[26] Weersma R, et al. Interaction between drugs and the gut microbiome. Gut. 2020 Aug;69(8):1510-1519.
[27] Martinez JE, et al. Unhealthy Lifestyle and Gut Dysbiosis: A Better Understanding of the Effects of Poor Diet and Nicotine on the Intestinal Microbiome. Front Endociinol (Lausanne). 2021 Jun 8;12:667066.
[28] Neroni B, et al. Relationship between sleep disorders and gut dysbiosis: what affects what? Sleep Med. 2021 Nov;87:1-7.
[29] Karl JP, et al. Effects of Psychological, Environmental and Physical Stressors on the Gut Microbiota. Front Microbiol. 2018 Sep 11;9:2013.
[30] Tu P, et al. Gut Microbiome Toxicity: Connecting the Environment and Gut Microbiome-Associated Diseases. 2020 Mar;8(1):19.
[31] Overman EL, et al. CRF Induces Intestinal Epithelial Barrier Injury via the Release of Mast Cell Proteases and TNF-a. PLoS One. 2012;7(6):e39935.
[32] Kelly JR, et al. Breaking down the barriers: the gut microbiome, intestinal permeability and stress-related psychiatric disorders. Front Cell Neurosci. 2015 Oct 14;9:392.
[33] Bersani FS, et al. Novel Pharmacological Targets for Combat PTSD-Metabolism, Inflammation, The Gut Microbime, and Mitochondrial Dysfunction. Mil Med. 2020 Jan 7;185(Suppl 1):311-318.
[34] Fasano A. Intestinal Permeability and Its Regulation by Zonulin: Diagnostic and Therapeutic Implications. Clin Gastroenteol Hepatol. 2012 Oct;10(10):1096-1100.
[35] Fasano A. Zonulin and its regulation of intestinal barrier function: the biological door to inflammation, autoimmunity, and cancer. Physiol Rev. 2011;91:151–175.
[36] Lahir YK. Morphological Aspects of Intercellular Communication. Bionano Frontier. 2014 Jun;7(1):3-11.
[37] Dejong EN, et al. The Gut Microbiota and Unhealthy Aging: Disentangling Cause from Consequence. Cell Host & Microbe. 2020 Aug 12;28(2):180-189.
[38] Shemtov SJ, et al. The intestinal immune system and gut barrier function in obesity and aging. FEBS J. 2022 Jun 21;10:1111.
[39] Myhrstad MCW, et al. Dietary Fiber, Gut Microbiota, and Metabolic Regulation—Current Status in Human Randomized Trials. Nutrients. 2020 Mar;12(3):859.
[40] Berdy J. Bioactive Microbial Metabolites. J. Antibiot. 2005;58(1):1.26.
[41] Alexander C, et al. Perspective: Physiologic Importance of Short-Chain Fatty Acids from Nondigestible Carbohydrate Fermentation. Advances in Nutrition. 2019 Jul;10(4):576-589.
[42] Antimicrobial Peptide Database: https://aps.unmc.edu/
[43] Huan Y, et al. Antimicrobial Peptides: Classification, Design, Application and Research Progress in Multiple Fields. Front Microbiol. 2020 Oct 16. https://www.frontiersin.org/articles/10.3389/fmicb.2020.582779/full
[44] Hill MJ. Intestinal flora and endogenous vitamin synthesis. Eur J Cancer Prev. 1997;6:S43–S45.
[45] Gill SR, et al. Metagenomic analysis of the human distal gut microbiome. Science. 2006;312:1355-1359.
[46] Abubucker S, et al. Metabolic reconstruction for metagenomic data and Its Application to the Human Microbiome. PLoS Comput Biol. 2012 Jun;8(6):e1002358.
[47] Lyte M. Probiotics function mechanistically as delivery vehicles for neuroactive compounds: microbial endocrinology in the design and use of probiotics. Bioessays. 2011;33(8), 574–581.
[48] Gagnon M, et al. Bioaccessible Antioxidants in Milk Fermented by Bifidobacterium longum subsp. Longum Strains. Biomed Res Int. 2015;2015:169381.
[49] Teskey G, et al. Glutathione as a Marker for Human Disease. Adv Clin Chem. 2018;87:141-159.
[50] Ritchie JP, et al. Correction of a glutathione deficiency in Aging mosquito increases in longevity. Proc Soc Exp Biol Med 184, 113-117 (1987).
[51] Pelton R. Lactobacillus fermentum ME-3: A Breakthrough in Glutathione Therapy. Integrative Medicine: A Clinician’s Journal. Aug/Sep2022, Vol. 21 Issue 4, p54-58.
[52] Gezginc Y, et al. Health promoting benefits of postbiotics produced by lactic acid bacteria: Exopolysaccharide. Biotech Studies. 2022.31(2):61-70.
[53] Garcia-Villalba, R, et al. Urolithins: a Comprehensive Update on their Metabolism, Bioactivity, and Associated Gut Microbiota. Mol Nutr Food Res. 2022 Nov;66(21):e2101019.
[54] Van der Es, D, et al. Teichoic acids: Synthesis and applications. Chem. Soc. Rev. 2017, 46, 1464–1482.
[55] Lee JY, et al. Improvements in Human Keratinocytes and Antimicrobial Effect Mediated by Cell-Free Supernatants Derived from Probiotics. Fermentation 2022, 8, 332.
[56] Fasano A, et al. Zonulin, a newly discovered modulator of intestinal permeability, and its expression in coeliac disease, Lancet. 2000 Apr 29;335(9214):1518-1519.
[57] Fasano A. Zonulin, regulation of tight junctions, and autoimmune diseases. Ann N Y Acad Sci. 2012 Jul;1258(1):25-33.
[58] Wang W, et al. Human zonulin, a potential modulator of intestinal tight junctions. J Cell Sci. 2000;113(Pt 24):4435–4440.
[59] Fasano A. All disease begins in the (leaky) gut: role of zonulin-mediated gut permeability in the pathogenesis of some chronic inflammatory diseases. F1000Res. 2020 Jan 31;9:F1000 Faculty Rev-69.
[60] Qi, Y, et al. Intestinal Permeability Biomarker Zonulin is Elevated in Healthy Aging. J AM Med Dir Assoc. 2017 Sep 1;18(9):810.e1-810.e4.
[61] Lau K, et al. Bridging the Gap between Gut Microbial Dysbiosis and Cardiovascular Diseases. Nutrients. 2017 Aug 10;9(8):859.
[62] Chakaroun RM, et al. Gut Microbiome, Intestinal Permeability, and Tissue Bacteria in Metabolic Disease: Perpetrators or Bystanders? Nutrients 2020, 12(4), 1082;
[63] Belizario JE and Faintuch J. Microbiome and Gut Dysbiosis. (2018). Microbiome and Gut Dysbiosis. In: Silvestre, R., Torrado, E. (eds) Metabolic Interaction in Infection. Experientia Supplementum, vol 109. Springer, Cham.
[64] Mansour SR, et al. Impact of diet on human gut microbiome and disease risk. New Microbes New Infect. 2021 May;41:100845.
[65] Clemens R, et al. Filling America’s Fiber Intake Gap: Summary of a Roundtable to Probe Realistic Solutions. Journal of Nutrition. 2012 Jul;142(7):1390S-1401S.
[66] Quagliani D and Felt-Gunderson P. Closing America’s Fiber Intake Gap. Am J Lifestyle Med. 2017 Jan-Feb.11(1):80-85.
[67] Lee-Kwan SH, et al. Disparities in State-Specific Adult Fruit and Vegetable Consumption-United States, 2015. Morb Mortal Wkly Rep. 2017 Nov 17;66(45):1241-1247.
[68] NHANES 2005-2006, America’s Phytonutrient Report, 2018, https://bit.ly/2DnlPqc.
[69] Martinez-Medina M, et al. Western diet induces dysbiosis with increased E coli in CEABAC10 mice, alters host barrier function favouring AIEC colonization. Gut. 2014 Jan;63(1):116-24.
[70] Almario CV, et al. Burden of Gastrointestinal Symptoms in the United States: Results of a Nationally Representative Survey of Over 71,000 Americans. Am J Gastroenterol. 2018 Nov;113(11):1701-1710.
[71] Franceschi C, et al. Inflamm-aging. An evolutionary perspective on immunosenescence. Ann N Y Acad Sci, 2000. 908 244–254.
[72] Kim M and Benayoun BA. The microbiome: an emerging key player in aging and longevity. Transl Med Aging. 2000;4:103-116.
[73] Mehta NN, et al. A human model of inflammatory cardio-metabolic dysfunction; a double blind placebo-controlled crossover trial. J Transl Med. 2012 Jun 18;10:124.
[74] Gilbert J, et al. Current understanding of the human microbiome. Nat Med. 2018 Apr 10;24(4):392-400.
[75] Bezkorovainy A. Probiotics: determinants of survival and growth in the gut. Am J Clin Nutr. 2001 Feb;73(2):399s-405s.
[76] Grace-Farfaglia P, et al. Essential Factors for a Healthy Microbiome: A Scoping Review. Int. J. Environ. Res. Public Health 2022, 19(14), 8361
[77] Kristensen NB, et al. Alterations in fecal microbiota composition by probiotic supplementation in healthy adults: a systematic review of randomized controlled trials. Genome Medicine. 2016 May 10;8(52).
[78] Sandifer PA, et al. Exploring connections among nature, biodiversity, ecosystem services, and human health and well-being: Opportunities to enhance health and biodiversity conservation. Ecosystem Services 2015 Apr; 112:1-15.
[79] Wen K, et al. High dose and low dose Lactobacillus acidophilus exerted differential immune modulating effects on T cell immune responses induced by an oral human rotavirus vaccine in gnotobiotic pigs. Vaccine. 2012;30(6):1198-1207.
[80] Shimizu K, et al. Measurement of the Intestinal pH in Mice under Various Conditions Reveals Alkalization Induced by Antibiotics. Antibiotics. 2021 Feb 11;10(2):180.
[81] Mayer E. The Gut-Immune Connection. 2021 New York, NY. Harper Wave/HarperCollins.
[82] Pelton R. Postbitic Metabolites: The New Frontier in Microbiome Science. Townsend Letter. 2019 Jun;431:64-69.
[83] Thorakkattu P, et al. Postbiotics: Current Trends in Food and Pharmaceutical Industry. Foods. 2022 Oct 5;11(19):3094.
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