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Probiotics

Nutrient Names: Probiotic intestinal flora and prebiotics.
Synonyms: Healthy bacteria, intestinal microbiota, probiotic flora, symbiotic flora.

Summary Table
nutrient description

NUTRIENT DESCRIPTION

Chemistry and Forms

Probiotics

Bifidobacterium adolescentis, B. animalis, B. bifidus (bifidum), B. breve, B. infantis, B. lactis, B. longum, B. thermophilum; Lactobacillus acidophilus, L. brevis, L. bulgaricus, L. casei, L. cellobiosus, L. crispatus, L. curvatus, L. fermentum, L., Lactobacillus GG (L. rhamnosus or L. casei subsp. rhamnosus), L. johnsonii, L. plantarum, L. salivarus; Saccharomyces boulardii, S. cerevisiae.

Lactobacillus bulgaricus and Streptococcus thermophilus are the “yogurt species.” Lactococcus lactis and L. lactis subspecies cremoris (Streptococcus cremoris) are also part of milk souring and are used as probiotics.

Enterococcus faecium (also in the streptococcal family) has also been used in the management of diarrheal illness.

Prebiotics

The most common prebiotics are inulin, a long-chain oligosaccharide (2-60 sugars), and fructooligosaccharide (FOS), a short-chain oligosaccharide (2-7 sugars). Almost all fibers function as prebiotics to some extent, as do many of the sugar alcohols (e.g., lactitol, maltitol, xylitol).

Related Substances

  • Probiotics: Live-culture foods; kefir, yogurt.
  • Prebiotics: Artichokes, onions, chicory, garlic, leeks; foods known to contain low-molecular-weight carbohydrates classified as FOS.

Physiology and Function

Probiotics are known by many names, including “live foods,” yogurt, lactobacilli, acidophilus, and “cultured” dairy products. The human gastrointestinal (GI) tract is home to more than a trillion live bacteria from about 400 species. The average adult body contains about 20 times more bacteria than it does somatic cells. 1 In the natural environment, a delicate symbiosis evolves between these endogenous bacteria and their host. These live organisms act beneficially by affecting the host animal, improving its intestinal microbial balance. The vital contribution of natural flora to normal intestinal development is underscored by studies of animals raised in a germ-free environment. These animals have hypoplastic intestinal epithelia, reduced gut immunity, and impaired peristalsis, all of which improve only when normal gut flora are introduced. 2 Scientific discoveries continue to highlight the multifaceted functions of intestinal microflora within multiple body systems. For example, emerging research regarding the vermiform appendix suggests that its major physiologic function may be to harbor and protect the commensal colonic flora, so that they are preserved and available to repopulate the colon after severe diarrheal illnesses such as cholera or other types of severe infectious gastroenteritis.2a

Probiotics change the metabolic activities or composition of microbiota and modulate immune system reactivity in ways that benefit healthy function. Exogenous probiotics are administered therapeutically to individuals in whom this naturally beneficial symbiosis has been disturbed, in an attempt to restore normal flora. A 2004 Cochrane review reports that probiotic therapy is effective in reducing diarrhea. 3 A 2005 report summarizing 185 studies found that probiotics successfully treated 68 different conditions in diverse populations. 4

Lactobacillus and Bifidobacterium each represent a genus of probiotics most often used therapeutically. Some species and strains are derived from the intestinal microbiota of healthy humans. Some bifidobacteria that have been perpetuated as probiotics for babies have been derived from human milk. Other species are nonhuman probiotics used in the fermentation of dairy products. Species from other bacterial genera, such as Streptococcus, Bacillus, and Enterococcus have also been used as probiotics, but concerns surround the safety of such probiotics because these genera also contain pathogenic species, particularly Enterococcus . 5-9Nonbacterial microorganisms such as yeasts from the genus Saccharomyces, most notably S. boulardii, have also been used as probiotics for many years.

Probiotics, as implied by their collective name, are a class of bacteria and yeast that are essentially life supporting in their action within human physiology. Historically, they have always been part of the human digestive tract ecology, with breastfeeding establishing the initial colonization process before the immune system has fully developed the distinction between self and other. Thus, in an immune sense, probiotics are within the boundaries of self in a presumably lifelong symbiotic relationship.

Microflora of the large intestine complete digestion through fermentation, playing a key role in the endogenous synthesis of vitamins (e.g., niacin, folic acid, biotin, K, B12, B6), short-chain fatty acids, amino acids (e.g.,L-arginine,L-cysteine,L-glutamine), and other “gut” nutrients. Microflora protect against overgrowth of opportunistic bacteria and fungi. These layers of tissue facilitate detoxification and stimulate the development of the immune system. For example, the metabolism of food by Lactobacillus acidophilus results in the production of lactic acid, hydrogen peroxide, and other beneficial byproducts that support changes in the gut environment hostile to unwanted organisms. Many of these bacteria are able to tolerate environments with a pH of 3 and 2% to 8% concentrations of bile acid. Probiotics in the diet can modify the composition and some metabolic activities of the intestinal microflora.

Certain probiotics are found as the live microorganisms in foods, such as active yogurt culture. Acidophilus organisms can act as a source of lactase. The microorganisms can survive passage through the gut and temporarily bring the benefits of normal gut flora. Bifidobacteria are anaerobic pleomorphic rods or club-shaped organisms that normally have an important role in breaking down dietary carbohydrate and interact directly with the host metabolism. Bifidobacteria also excrete water-soluble vitamins, but species and strains are considerably different. The healthy human gut, without pharmacological disruption, contains a wide range of bacterial species, and once established, variable strains normally grow in number and diversity. Fructooligosaccharides are naturally occurring carbohydrates that support the growth of bifidobacteria and cannot be digested or absorbed by humans.

Pharmacokinetic data suggest that human intestinal flora are essential for hydrolysis of the glycoside forms of the anthocyanin and proanthocyanin moities, as well as the glycoside forms of isoflavones and phytoestrogens. 10-12These data suggest that iatrogenic reduction in microflora induced by antibiotics may reduce the bioavailability of at least some plant food polyphenols, although clinical evidence is not available.

The ideal probiotic should remain viable at the level of the large intestine and should adhere to the intestinal epithelium to confer a significant health benefit. Viable bacteria have greater immunological effects than nonviable bacteria and killed bacteria have been associated with adverse effects in some cases. 13,14Some of the best-characterized probiotics have been shown to adhere strongly to intestinal epithelium through in vivo and in vitro studies. 15 Probiotics must also be resistant to gastric acid digestion and to bile salts to reach the intestinal tract intact, and they should be nonpathogenic. 16

nutrient in clinical practice

Known or Potential Therapeutic Uses

Probiotics have been clinically used to protect against intestinal permeability resulting from intestinal inflammation induced by nonsteroidal anti-inflammatory drugs (NSAIDs). Probiotics are also used to help reduce the adverse side effect of antibiotic-induced diarrhea. The concern about overuse of antibiotics has recently been noted because of the more frequent overgrowth of antibiotic-resistant bacteria such as Clostridium difficile, which causes a severe form of colitis due to antibiotic therapy. Probiotic yeast such as Saccharomyces boulardii have been used as specific therapy for C. difficile colitis. Probiotics are used to enhance immune system factors to aid in the sequelae of asthma, allergies, upper respiratory infections, eczema, and other autoimmune disorders. Probiotics help replenish the intestinal flora when it is depleted by the factors surrounding infectious diarrhea, irritable bowel syndrome, and other intestinal disorders partly created by a depletion of healthy gut flora.

Historical/Ethnomedicine Precedent

Probiotics in the form of Streptococcus thermophilus and Lactobacillus bulgaricus in fermented milk have been ingested by humans for thousands of years in the belief they have health benefits. Fermented dairy products such as yogurt have been prepared and consumed since the third millenniumBCE, with the earliest uses most likely deriving from experiences of ingesting materials created through spontaneous fermentation by naturally occurring bacteria living on the goatskin bags used by the Bulgars (or Hunno-Bulgars). The development of food derived from fermentation of soy represents a parallel culinary evolution in East Asia. Likewise, in Biblical history, it was written that Abraham owed his fertility and longevity to the regular ingestion of yogurt. In the early twentieth century, the Russian immunologist Elie Metchnikoff proposed that lactic acid bacilli may have beneficial health effects and attributed his own longevity to regular probiotic ingestion.

Possible Uses

Allergic airway disease, allergic reactions (risk reduction and treatment), antibiotic-induced diarrhea, arthritis, atopy (particularly in infants), bone mineralization, calcium absorption, cancer, candidiasis, carcinogenic compound reduction in GI tract, cholesterol, constipation, Crohn's disease, diarrhea, digestive problems, dysbiosis, eczema, enteritis, food intolerances/sensitivities, food poisoning, glutamate synthase, Helicobacter pylori infection, hypercholesterolemia, immune enhancement/support, immune system development, intestinal permeability from NSAID-induced intestinal inflammation, irritable bowel disorder, irritable bowel syndrome, lactose intolerance, malnutrition, obesity, oral thrush, osteoporosis, pollen allergy, pouchitis, pseudomembranous colitis, seasonal allergies, sinusitis, surgery recovery, traveler's diarrhea, ulcerative colitis, vaginal infections, vulvovaginitis, workplace wellness (decreased sick leave), yeast infections.

Deficiency Symptoms

The absence of healthy live bacteria in the intestines have led to hypoplastic intestinal epithelia, reduced gut immunity, and impaired peristalsis. 2 The depletion of such organisms tend to increase gut permeability, leaky gut syndrome, dysbiosis, abdominal distention, bloating, abdominal cramping, loose stools, fatigue, constipation, and acute/chronic diarrhea.

Dietary Sources

A wide variety of foods have live bacteria that contain mixtures of lactobacilli and bifidobacteria. These foods include yogurt, kefir, fermented foods such as sauerkraut and kimchi, probiotic foods, and prebiotic foods; most yogurt preparations are usually mixtures of lactobacilli and bifidobacteria, sometimes with Streptococcus thermophilus . Some “soil organisms” are primarily derived from soil, rather than mammals.

Nutrient Preparations Available

Bifidobacteria, acidophilus, lactobacillus, yogurt, yeasts, fermented foods. Probiotic Escherichia coli are available in Germany. The most common prebiotics are inulin and fructooligosaccharides (see Chemistry and Forms).

Dosage Forms Available

Capsule, enema, liquid (oral), liquid (topical), powder.

Most commercially available forms of probiotic supplements are refrigerated until consumption because culture viability remains an important issue in achieving therapeutic effects. Some manufacturers market probiotic products that they claim do not require refrigeration to maintain stability due to freeze-drying or other processes. Nevertheless, shelf life viability of all preparations is somewhat shorter at room temperature than under refrigeration.

Source Material for Nutrient Preparations

Cow's milk, goat milk, human milk; carrots, corn; soil.

Dosage Range

Dosage is represented as number of organisms per dose/serving (often noted as “CFU” for “colony-forming units”).

Adult

Dietary: None established.

Supplemental/Maintenance: One capsule or teaspoon per day orally, typically providing 1 to 2 billion CFU.

Pharmacological/Therapeutic: Dosage in clinical trials has ranged from 1 to 20 billion microflora. A typical therapeutic dose of probiotic bacteria is 2 to 4 billion CFU, two to four times daily, and that of Saccharomyces boulardii yeast is 500 mg, standardized to provide 3 billion CFU per gram, twice daily. S. boulardii is usually administered concurrently with antibiotic therapy, and bacterial probiotics are given after completion of a course of antibiotics, for 1 to 6 months.

Toxic: No toxicity has been established.

Pediatric (<18 Years)

Dietary: None established.

Supplemental/Maintenance: One capsule or teaspoon per day orally, typically providing 1 to 2 billion CFU.

Pharmacological/Therapeutic: See Adult. Toxic: None established.

Laboratory Values

Select laboratories have tests for presence, number, types, and characteristics of bacteria, as well as presence of pathogenic microorganisms and excessive gut permeability.

safety profile

Overview

Generally, medical literature reports probiotics as safe for human consumption. Potential benefits must be considered against possible harm, knowing that the data will never be absolute. Relevant data can be divided into two categories: population surveys, both retrospective and prospective, and anecdotal case reports that retrospectively try to establish some connection to prior ingestion of probiotics. Neither category provides a definitive scientific evidence–based overview of the safety of probiotics. Some clinical scientists assert that there will never be definitive clinical data. 17

Based on Finnish estimates that 0.02% of blood cultures test positive for lactobacilli, more than 166,000 patients would need to be studied prospectively to detect a 10% increase in bacteremia caused by Lactobacillus . Even with this estimate, given that blood was cultured in the Finnish study only for clinical indications, the expected yield would likely be lower if blood from healthy patients who ingested probiotics prophylactically were routinely cultured.

Although immunocompromised patients are especially vulnerable to infection, prospective studies have shown that probiotics are safe in immunocompromised adults and children with human immunodeficiency virus (HIV). 18,19

In preterm neonates, probiotics reduce the incidence and severity of necrotizing enterocolitis, with no secondary probiotic infections seen to date. 20,21

Sepsis from Lactobacillus has not been reported in prospective randomized studies of probiotics. The risk of sepsis from Lactobacillus should be weighed against risk of sepsis with more pathological species of bacteria and against risk of the disease that probiotic therapy was meant to prevent. 17 Many Lactobacillus species are intrinsically vancomycin resistant but have had a long history of safe use as probiotics. There is no indication thus far that vancomycin-resistant lactobacilli could transfer the resistance to other bacteria by plasmids or other means. 22 Although rare, reports indicating the presence of probiotic bacteria in samples isolated from infected tissues have raised concerns about their intrinsic properties as well as their potential pathogenicity. 23,24Improperly stored probiotic products may cause nausea and minor GI distress resulting from degradation.

In a paper reviewing safety issues, Hammerman et al. 17 presented anecdotal adverse reports that clinical Lactobacillus infections do exist, most often in elderly patients. The most often cited case is a well-qualified report of a 74-year-old woman who developed a liver abscess after ingesting Lactobacillus rhamnosus for 4 months. After direct “gram-staining of a hepatic abscess aspirate demonstrated an abundance of polymorphonuclear leukocytes and gram-positive coccobacilli,” the authors observed that the “fermentation pattern and enzymatic reactions of this isolate were compatible with a probiotic strain L. rhamnosus GG used in dairy products in Finland since 1990.” 7 However, they also noted that the “incidence of severe infections caused by lactobacilli is very low.” Notably, the case report does not disclose the comedications used by the woman, diagnosed as an adult-onset diabetic, which might reveal the impact of potential adverse effects of any pharmacodynamic interaction occurring with her liver. Another concern would be medications or conditions that might lead to intestinal ulceration, thus providing a portal of entry to the bloodstream for ingested probiotic bacteria. In other case reports, a 67-year-old man with mitral valve regurgitation developed Lactobacillus endocarditis and sepsis after a tooth extraction, 8 and a 6-week-old infant developed Lactobacillus sepsis, although the child had severe underlying medical problems. 25

Nutrient Adverse Effects

General Adverse Effects

Mild to moderate flulike symptoms, flatulence, abdominal bloating, nausea, and loose stools, resulting from “die-off” of pathogenic yeast and bacteria in the gut, are common in the first week of dosing with probiotics, a phenomenon also known as Jarisch-Herxheimer reaction. Temporary dose reduction or temporary cessation and titration of dose and administration interval typically alleviates the discomfort.

Adverse Effects Among Specific Populations

None confirmed.

Pregnancy and Nursing

None established.

Infants and Children

None established. There have been numerous studies illustrating the safety and effectiveness of probiotics with infants. 26-32

Effect and Mechanism of Action

Probiotics change the metabolic activities or composition of microbiota and modulate immune system reactivity that benefits health. Exogenous probiotics are given therapeutically to individuals in whom this naturally beneficial symbiosis has been disturbed, in an attempt to restore normal flora.

Contraindications

Probiotic agents are potentially contraindicated in immunosuppressed individuals, particularly those with or at risk for ulcerations of the GI tract. Although administration of probiotics is often a core tactic within integrative nutritional therapeutic strategies for immunocompromised patients, a single unqualified case report described an immunosuppressed patient who developed a Lactobacillus infection after eating yogurt. 33

interactions review

Strategic Considerations

Probiotics have been advocated for the prevention and treatment of a wide range of diseases, and strong evidence exists for their efficacy in some clinical scenarios. Probiotics are now widely used in many countries by both consumers and in clinical practice. Given the increasingly widespread use of probiotics, a thorough understanding of their risks and benefits is imperative.

Dietary modulation of gut microbiota with prebiotics and probiotics is an important function in nutritional sciences. In addition, some nutritional approaches use other nutraceuticals and botanicals, such as a modified butyric acid, as well as Chinese herbal formulae and the essential oil of oregano as sequential or symbiotic therapies. Prebiotics are defined as a functional food that has nondigestible food ingredients that beneficially affects the host by selectively stimulating the growth and activity of one or a limited number of symbiotic bacteria in the colon. Prebiotics can be nondigestible oligosaccharides and fibers, but also may be poorly absorbed sugars (e.g.,D-tagatose) or sugar alcohols (e.g., lactitol, xylitol), which promote the growth of symbiotic colonic microflora. Among the oligosaccharides, inulin and oligofructose have been shown to inhibit growth of pathogens and to display clear bifidogenic properties. 34

The status of human intestinal ecology radically changed in the past 60 years in a direction far removed from anything comparable to millennia of evolutionary experience. Up until the middle of the twentieth century, the GI tract of adult humans, in both industrialized and undeveloped cultures, was populated by trillions of diverse organisms that might compose 6 to 8 pounds of living mass. 35 However, the status of bacterial microbiota playing their symbiotic role in digestive, immune, and other functions has been significantly altered by the decline of breastfeeding, the introduction of chlorine in water supplies, declining levels of biological activity in agricultural soil, and the massive upsurge in the medical and animal husbandry use of antimicrobial agents, particularly broad-spectrum antibiotics. Subsequently, recognition has grown steadily as to the profound and widespread systemic implications of the depletion of this intimate natural resource within the human ecology and economy. Health care professionals have long recognized the immediate and long-term impact of antibiotic therapy on the intestinal flora, but the pervasive and cumulative, local and systemic sequelae of overgrowth of pathogenic yeast and anaerobic bacteria, with the attendant loss of metabolic activities and buffering presence for the gut mucosa of the symbiotic bacteria, have been more subtle.

Nevertheless, research into the particulars of such adverse effects has been absent or negligible. Scientific experiments and well-designed clinical trials are needed to investigate critical issues such as the variable susceptibilities within patient populations based on perinatal and infant nutrition, the divergent impact of antibiotics versus other medications as well as specific versus broad-spectrum antibiotics, and the differential effects of short-term versus chronic medication regimens and isolated versus repeated antibiotic administration. In addition, high-quality studies are needed regarding the efficacy of intake of cultured foods such as yogurt versus probiotic products on symbiont repletion, and on the effectiveness of various therapeutic repletion tactics, such as flora constituents (e.g., species, strains), methods of gut preparation and role of prebiotics in reestablishing a dynamic symbiotic microbiota, necessary numbers of organisms, combinations and duration of intake, methods of preparation, and methods of stabilization and delivery of probiotic organisms. In many respects, these concerns include the inherently related and increasingly critical issue of antibiotic-resistant pathogens. Moreover, critical investigation is required to determine the degree to which botanical and nutritional agents might also decimate and disrupt, or support and enhance, healthy flora and gut ecology.

Probiotic repletion and rejuvenation of the gut mucosa have long played a central role in the therapeutic strategies of experienced practitioners within nutritional, naturopathic, and integrative medicine. Given the patient population and their typical medical histories, it is often assumed that healthy flora are lacking and that degradation of the gut integrity and ecology has ensued to such a degree as to participate in a general decline in health and an increase in susceptibility because of decreased function and increased toxic load. Thus, in so many cases, whether labeled with such vaguely defined syndromes as “fibromyalgia,” “chronic fatigue,” or “food sensitivities,” or more conventionally as asthma and atopy, irritable bowel, or constipation, the initial stages of treating a patient with chronic conditions centers around improving dietary habits and reconstructing the gut ecology. However, as in so many areas of integrative medicine's maturation, it is necessary to move past naive assumptions that naturally occurring substances are inherently benign and universally beneficial. Such an approach must give way to a scientifically based and clinically efficacious approach employing all agents, regardless of origins, as potential tools in evolving and multidisciplinary strategies personalized to optimal intervention, given individual pharmacogenomic and biochemical variability and responses to therapeutic interventions.

A cursory review of the scientific literature over the past 20 years reveals a rapidly ascending curve representing the numbers of scientific studies and published papers focusing on the physiology and therapeutics of probiotics, prebiotics, and related topics. For example, there is clinical evidence to show that probiotics may help children with food sensitivities, whereas there was no effect in those without food sensitivities. 36

Probiotic therapy has been applied for decades, if not millennia, in many clinical circumstances, from treating asthma and irritable bowel syndrome to preventing thrush or constipation. Research into the safety, applicability, and efficacy of probiotics needs to keep pace with their rapidly expanding popularity in the consumer market and their continued expansion within professional medical contexts.

nutrient-drug interactions
Antibiotics/Antimicrobial Agents (Systemic)
Helicobacter pylori Triple Therapy (LAM)/Quadruple Therapy
Lansoprazole-amoxicillin-metronidazole (LAM) triple-therapy regimen: Lansoprazole (Prevacid), amoxicillin (Amoxil, Polymox, Trimox, Wymox; Augmentin), metronidazole (Flagyl, Protostat). Related: HeliMet (Wyeth; discontinued August 2005 in United Kingdom): Lansoprazole (Zoton), clarithromycin (Klaricid), metronidazole.
Beneficial or Supportive Interaction, with Professional Management

Probability: 2. Probable
Evidence Base: Emerging

Effect and Mechanism of Action

Probiotics can be incorporated into a triple-therapy (or quadruple-therapy) methodology using a proton pump inhibitor (PPI) and two antibiotics. 47,63 Higher eradication rates are found with the coadministration of probiotic agents and pharmaceutical agents.

Research

In a trial involving 138 patients in whom triple therapy failed, Sheu et al. 47 found that a 4-week pretreatment with Lactobacillus- and Bifidobacterium-containing yogurt (AB-yogurt) “can decrease H. pyloriloads despite antimicrobial resistance, thus improving the efficacy of quadruple therapy in eradicating residual H. pylori.”

Nutritional Therapeutics, Clinical Concerns, and Adaptations

Physicians prescribing triple (or quadruple) therapy for recalcitrant Helicobacter pyloriinfection are advised to consider coadministration of probiotic flora during and after such eradication therapy.

theoretical, speculative, and preliminary interactions research, including overstated interactions claims
Sulfasalazine
nutrient-nutrient interactions
Oligosaccharides and Other Prebiotics
herb-nutrient interactions
Echinacea
Ginseng, Chinese/Korean
Citations and Reference Literature
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