Celiac disease is a complex inherited digestive disorder that affects I in 100 persons worldwide. This condition involves a unique immune response within the digestive tract to gluten, a protein found in the grains of wheat, barley, rye and oats. All persons with celiac disease, regardless of age, race or gender, are susceptible to intestinal damage when they eat food containing gluten or its derivatives. The treatment for celiac disease is a strict gluten-free diet that stops damage and allows recovery. Probiotics and prebiotics should be incorporated into the diet to improve the quality and balance of intestinal bacteria that inhabit the colon.
Celiac Disease (CD) is not curable, but it is manageable by eating a strict gluten free diet. That may not be enough.
Many suffering from CD still feel ill even after being faithful to a gluten free diet. Celiac Disease is an autoimmune disease which causes your body to attack and destroy the microvilli and villi in your small intestines. These are key to the absorption of nutrients from food and are also where many enzymes used in digestion are made. When these are destroyed, the ability to absorb nutrients decreases and can lead to malnutrition.
This is not all that happens in a damaged intestine. Gluten can cause the tight junctions, spaces between cells lining the intestines, to be damaged or destroyed allowing larger molecules such as proteins and even microorganisms to pass into the blood stream.
Under normal circumstances, the intestinal wall only permits small particles to pass through the intestinal wall and into the blood stream. When these larger molecules make it through into the blood stream our bodies do not recognize these larger molecules and an autoimmune response begins. It is these autoimmune responses that may be the cause of you still feeling ill. What needs to happen to feel well again, is to heal the gut.
Close-up Slice of a Small Intestinal Villus Showing How Enterocytes Appear Tightly Lining the Entire Outside Surface Of A Villus. Courtesy Cleo Libonati
What Is Increased Intestinal Permeability?
Increased intestinal permeability is characterized by dysfunctional intestinal permeability (leakiness) allowing for the penetration of harmful entities from the gut into the bloodstream such as undigested proteins and microbes. The popular name is “leaky gut.”
Q: Why does intestinal permeability increase?
A: Intestinal permeability is an essential function of the small intestinal mucosal lining by which wanted substances such as properly digested foodstuffs are allowed to permeate through the lining to enter the body via the bloodstream and lymphatics. At the same time unwanted substances are kept out.
The mucosal lining is one cell thick and makes up the surface between the digested foodstuffs inside the hollow of the intestine and the underlying tissues.
The mucosal lining is covered by millions of microscopic finger-like structures called villi that project toward the inside of the intestine giving the appearance of a shag rug.
Each one, called a villus, contains a capillary bringing blood to absorb nutrients, a vein to take away nutrients, and a lacteal to absorb and take away digested fat. Its wall is made up of a single layer of tightly connecting cells, called enterocytes.
This single layer of cells separates the contents of our small intestine from the lamina propria (underlying tissues of the small intestine) and the rest of our body. Breaching of this single layer of cells by leakiness can expose lymphocytes (immune cells) located in the lamina propria to a myriad of microorganisms and food antigens, leading to immune reactions.1
To protect the body from unwanted substances, a gatekeeping barrier system operates to regulate the passage of nutrients, or permeation, through the surface mucosal lining. This system acts to seal the inside body from the gut.
The integrity of intestinal permeability is determined by interactions among several barrier components including the unstirred water layer, mucosal surface hydrophobicity, the surface mucous coat, and cell factors (especially tight junctions).
Tight junctions hold cells tightly together side-by-side to prevent unwanted substances from passing through the lining. Tight junctions are complex structures comprising over 50 proteins, such as the claudin proteins which are considered to be the structural backbone of tight junctions.
Tight junctions include a series of special proteins forming fibrils (springy like proteins) that cross the plasma membrane and interact with proteins in the adjoining cells. Tight junctions are regulated by the protein zonulin.2
If zonulin deregulates from the action of substances such as gliadin (gluten in wheat) and bacteria, the tight junction barrier fails which results in increased intestinal permeability. Dysfunction of the barrier system allows unwanted substances to enter the body where they are damaging to many tissues.
Tight junction dysfunction has been shown to be a part of certain autoimmune diseases such as celiac disease, type I diabetes mellitus, multiple sclerosis, and rheumatoid arthritis. Other diseases associated are cancer, allergies, and infections.3
Important gastrointestinal infections that cause leaky gut include rotavirus, parasites, pathogenic bacteria (escherichia coli, clostridium difficile), and mycotoxins produced by fungi found in stored grain and dried fruit.4
Fortunately, the presence of some commensal (friendly intestinal bacteria) and probiotic strains leads to an increase in tight junctions proteins at the cell boundaries and in some cases prevents or reverses the adverse effects of pathogens, food and stress. Various dietary components are also known to regulate epithelial permeability by modifying expression and localization of tight junctions proteins.2
What Is Increased Intestinal Permeability In Celiac Disease and/or Gluten Sensitivity?
Sources:
Fahardi A, Banan A, Fields J, Keshavarzian A. Intestinal barrier: an interface between health and disease. Journal of Gastroenterology and Hepatology. 2003; 18: 479-497. [↩]
Ulluwishewa D, Anderson RC, McNabb WC, Moughan PJ, Wells JM, Roy NC. Regulation of tight junction permeability by intestinal bacteria and dietary components. J Nutr. 2011 May;141(5):769-76. doi: 10.3945/jn.110.135657. [↩] [↩]
Fasano A. Zonulin and Its Regulation of Intestinal Barrier Function: The Biological Door to Inflammation, Autoimmunity, and Cancer. Physiological Reviews. January 2011Vol. 91no. 151-175DOI: 10.1152/physrev.00003.2008 [↩]
Farhadi A, Banan A, Fields J, Keshavarzian A. Intestinal barrier: an interface between health and disease. Journal of Gastroenterology and Hepatology. 2003;18:479-91. [↩]
Living 100% Gluten-Free is a challenge. Most of us, even after we’ve learned about hidden sources of gluten and done our best to stay away from them….are going to get “glutened” from time to time. This happens most often with:
1-Cross contamination 2-Eating out at a new restaurant 3-Eating products that don’t have any “gluten” ingredients…but still aren’t 100% GF.
We have to be extremely careful with cross contamination in our own homes. Most of us are living with non-GF people. So make sure everyone knows which toaster is the GF one….and when your grandma is baking glutenous pies, cakes, and bread….stay far away from the kitchen. Trust me, I know. Even a TINY bit of gluten will do THIS to me:
Of course, I often get the same reaction when eating out at a new place I’m unsure about. Many restaurants offer “gluten-free” items, but they
Inflammation is our body’s necessary self-defense response and repair mechanism for these assaults:
1) injuries such as cuts, scrapes, sprains, broken bones, burns, insect bites, toxins; 2) invading organisms such as bacteria; and 3) allergens and food sensitivities such as gluten.
Inflammation can be immediate (acute) or persistent (chronic).
Acute inflammation is marked by increased blood flow, migration of white blood cells, and release of defensive proteins and chemicals to the site of injured tissue. Among these chemicals are free radicals in the immune response to injury that are beneficial yet require the activity of anti-oxidants such as vitamin E and vitamin C to control.
Free radicals are chemical particles containing one or more unpaired electrons, which may be part of the molecule. They cause the molecule to become highly reactive.1
The majority of this response takes place in the first 12 to 24 hours after the assault. The inflammatory process continues until all the damaged tissue or invading germs are removed (usually about 5 days).2
Chronic inflammation is marked by persistence weeks to months or longer after tissue damage. Note: high concentrations of free radicals generated in chronic inflammation may be important causes of damage to cell structures. The defensive activity of anti-oxidants such as vitamin E and vitamin C are required to remove free radicals.
Chronic inflammation increases the risk for systemic diseases such as type II diabetes, obesity, heart disease, high blood pressure, arthritis, osteoporosis, chronic fatigue, migraine, autoimmune disease, and vasculitis which may cause stroke, heart attack or deep vein thrombosis (DVT).
Importantly, chronic inflammation is a risk factor for the onset of cancer.3
Q: Are there blood tests available for detecting inflammation?
A: Yes. Your medical health practitioner can order either or both of the following blood tests that measure the amount of inflammation present although not the source of inflammation. Abnormal is an elevation in blood levels.
C-reactive protein (CRP). This test measure C-reactive proteins that are released into the bloodstream within a few hours of tissue injury or infection. CRPs are cytokines called ‘acute phase reactants,’ meaning first on the scene. The CRP test is also useful to monitor treatment response and flare-ups of chronic inflammatory disease such as vasculitis, systemic lupus, and inflammatory bowel disease.
Erythrocyte sedimentation rate (ESR or sed rate). This test measures the rate of fall of blood cells in a sample tube of blood. An increase in the rate of fall shows inflammation due to an increase of C-reactive proteins in the blood specimen. Alone or with the CRP test, the ESR is especially useful for monitoring inflammation of veins and arteries.
In regards to celiac disease, disappearance of blood antibody levels of tissue transglutaminase IgA (tTG-IgA) indicate that inflammation has also subsided. These antibodies should be checked at 3 months, 6 months if indicated, and one year after diagnosis to monitor healing. On the other hand, raised antibodies indicate that there is definitely ongoing inflammation in the small intestine.
In regards to non-celiac gluten sensitivity, disappearance of blood antibody levels of anti-gliadin IgA and IgG at 3 months, 6 months if indicated, and one year after diagnosis indicate that inflammation has also subsided. On the other hand, raised antibodies indicate that there is definitely ongoing inflammation caused by gluten within the body.
What Is Inflammation In Celiac Disease and/or Gluten Sensitivity?
Sources:
Ruttkay-Nedecky B, Nejdl L , Gumulec J. The Role of Metallothionein in Oxidative Stress. Int. J. Mol. Sci. 2013, 14(3), 6044-6066; doi:10.3390/ijms14036044. [↩]
Taber’s Cyclopedic Medical Dictionary. 19th ed. F A Davis Company. Philadelphia, PA. [↩]
Brighenti E, Giannone FA, Fornari F, Onofrillo C, Govoni M, Montanaro L, Treré D, Derenzini M. Therapeutic dosages of aspirin counteract the IL-6 induced pro-tumorigenic effects by slowing-down the ribosome biogenesis rate. Oncotarget. 2016 Aug 20. doi: 10.18632/oncotarget.11441. [↩]
What Is Intestinal Dysbiosis? Intestinal dysbiosis is an imbalance of the composition and quantity of microbe populations (called the microbiota), that naturally inhabit our human gut. Dysbiosis causes altered gut immunity, abnormal fermentation of undigested foodstuffs,…
O besity is an inflammatory metabolic disorder that is characterized by body mass index greater than 30% resulting from excessive body fat stored in adipose tissue.
Q: What is body fat?
A: Body fat is part of the body that functions as a reserve of stored energy. It is composed of fat cells, called adipocytes, having thin membranes between these cells. Adipocytes expand to store fat and shrink as fat is released as needed into the bloodstream for other body cells to use for metabolizing energy.
Each adipocyte contains a drop of triglyceride which is a type of lipid (fat). Triglycerides are a normal component in the bloodstream and, as such, are transported wherever needed as a form of energy. Excess triglycerides are the form of fat that is stored.
Initially, fat that is eaten in the diet is changed by digestive enzymes into the triglyceride form which is a molecule composed of three fatty acids and glycerol. Triglycerides are then absorbed through the small intestinal wall to be delivered to the liver. Of note, the liver can make triglycerides from excess protein and carbohydrates eaten in a meal, especially sugar and alcohol. The liver on the other hand makes cholesterol from triglycerides.
Triglyceride levels in the blood generally increase as weight increases. It is thought that an elevated blood triglyceride level hampers the body’s ability to feel full or satisfied with food that is eaten. Elevated triglyceride levels also increase the risk of clot formation because they cause the blood to become thicker. A normal triglyceride blood level is 150 mg/dL.
The causes of obesity are complex and varied. Those related to gluten sensitivity are discussed below.
What Is Obesity In Celiac Disease and/or Gluten Sensitivity?
Gluten sensitive enteropathy is active celiac disease characterized by inflammation of the small intestinal mucosa that results from an inherited immunologic intolerance to ingested gluten.
Q: What does the inflammation do to the mucosa in the small intestine?
A: Inflammation is a cell level immune response to gluten that has these effects on the mucosa:
Damages the barely visible villi (multitudinous finger-like structures) by causing atrophy or loss.
Likely affects the structural support and microcirculation of the villus, leading to collapse of the villus.
Elongates the crypts between villi. The thickening of the crypt is not so much a response to loss of surface enterocytes but represents inflammation of the mucosa.1
Increases round cells in the lamina propria and surface epithelial cells leaving few, irregular microvilli (brush border) on the surface of villi.
Damage is most intense in the duodenum and decreases toward the large intestine.
The extent of the damage to the intestine determines the malabsorptive consequences of the disease. Both gastric and small intestinal permeability are disrupted in patients with celiac disease.2
Relationship between active celiac disease and intestinal permeability: There is a clear association between degree of mucosal damage and the intestinal-permeability ratio, and a normal ratio generally implies near-normal small intestinal structure. A raised intestinal permeability of the mucosal lining (leaky gut) could predispose to a high absorption of gluten and exacerbate an existing lesion and hence convert a latent to an overt enteropathy.3
Relationship between active celiac disease and tight junction proteins: A study of intestinal permeability showed that the expression of all junction proteins of the small intestinal lining (occludin, claudin 3, zonula occludens 1, and E-cadherin) was already decreased in early stage celiac disease when compared with non-celiac controls, showing leaky gut and confirming the above earlier study by Johnston et al. Junction protein expression correlated positively with mucosal villus structure and negatively with the number of intraepithelial lymphocytes (IELs), the intensity of small-intestinal autoantibody deposits, and serum autoantibodies. The expression of claudin 3 showed a negative correlation with diarrheal score.4
Relationship between active celiac disease and inflammation. In celiac disease there is an over production of inflammatory interleukin-15 (IL-15) which inhibits the correct removal of damaged intraepithelial lymphocytes caused by the reaction to gluten. Serum levels of IL-15 are directly correlated with the seriousness of tissue damage.5
Relationship between active celiac disease and gut microbiota. Results of a study investigating intestinal microbiota (normal bacterial residents) in patients with celiac disease suggest that with lower levels of the genus bifidobacteria, celiac patients have an imbalance in the intestinal microbiota even while on a gluten-free diet. This fact could favor the pathological process of the disorder. The concentration of bifidobacteria per gram of feces was significantly higher in healthy subjects (2.5 ± 1.5 x107 CFU/g) when compared to celiac patients (1.5 ± 0.63 x108 CFU/g).6
Relationship between active celiac disease and endoscopy technique. The most severe degree of villous atrophy was detected when distal duodenal biopsy specimens were taken in addition to a duodenal bulb biopsy specimen from either the 9- or 12-o’clock position (96.4% sensitivity; 95% CI, 79.7%-100%). The difference between the 12-o’clock position biopsy and the 3-o’clock position biopsy in detecting the most severe villous atrophy was 92% (24/26 patients) versus 65% (17/26 patients).7
Relationship between active celiac disease and diet adherence. Patients with consistent gluten free diet adherence experience symptomatic responses to dietary gluten (SRDG) faster and more severe in comparison to their prior gluten exposure possibly demonstrating an adept immunological response. Anxiety and depression also enhance the speed of symptom onset and co-existing visceral hypersensitivity is a risk factor for severe reactions to dietary gluten.8
Relationship between active celiac disease and atrial fibrillation: Patients with celiac disease, verified by intestinal biopsy, are at increased risk of atrial fibrillation. This observation is consistent with previous findings that elevation of inflammatory markers predicts atrial fibrillation.9
How Prevalent Is Gluten Sensitive Enteropathy?
Sources:
Murray JA, the widening spectrum of celiac disease. American Journal of Clinical Nutrition. Mar 1999; 69(3):354-365. [↩]
Murray JA, the widening spectrum of celiac disease. American Journal of Clinical Nutrition. Mar 1999; 69(3):354-365. [↩]
Johnston SD, Smye M, Watson RGP. Intestinal permeability and morphometric recovery in coeliac disease. Lancet. Jul 28, 2001;358(9278):259, 2p. [↩]
Rauhavirta T, Lindfors K, Koskinen O, Laurila K, Kurppa K, Saavalainen P, Mäki M, Collin P, Kaukinen K. Impaired epithelial integrity in the duodenal mucosa in early stages of celiac disease. Transl Res. 2014 Sep;164(3):223-31. doi: 10.1016/j.trsl.2014.02.006 [↩]
Stazi AV, Trinti B. Selenium status and over-expression of interleukin-15 in celiac disease and autoimmune thyroid diseases. Ann Ist Super Sanita. 2010;46(4):389-99.DOI: 10.4415/ANN_10_04_06. [↩]
Golfetto L, de Senna FD, Hermes J, Beserra BT, França Fda S, Martinello F. Lower bifidobacteria counts in adult patients with celiac disease on a gluten-free diet. Arq Gastroenterol. 2014 Apr-Jun;51(2):139-43. [↩]
Kurien M, Evans KE, Hopper AD, Hale MF, Cross SS, Sanders DS. Duodenal bulb biopsies for diagnosing adult celiac disease: is there an optimal biopsy site? Gastrointest Endosc. 2012 Jun;75(6):1190-6. doi: 10.1016/j.gie.2012.02.025. [↩]
Barratt SM, Leeds JS, Sanders DS. Factors influencing the type, timing and severity of symptomatic responses to dietary gluten in patients with biopsy-proven coeliac disease. J Gastrointestin Liver Dis. 2013 Dec;22(4):391-6. [↩]
Emilsson L, Smith JG, West J, Melander O, Ludvigsson JF. Increased risk of atrial fibrillation in patients with coeliac disease: a nationwide cohort study. Eur Heart J. 2011 Oct;32(19):2430-7. doi: 10.1093/eurheartj/ehr167. [↩]
Malignant lymphoma high grade B-cell. Courtesy Wikimedia
What Is B-Cell Non-Hodgkin’s Lymphoma?
B cell non-Hodgkin’s lymphoma is a malignant, monoclonal (arising from a single cell) proliferation of lymphocytes that is preceded by lymphadenopathy and characterized by varying, less predictable spread than Hodgkin’s disease.
Lymphadenopathy is enlargement of lymph nodes greater than 1.5 cm caused by activation and increased production of lymphocytes and phagocytes (type of white blood cell that engulfs pathogens during infection) or invasion by a tumor.
Q: How does this type of lymphoma develop?
A: 80% to 85% of non-Hodgkin’s lymphoma arise from B-lymphocytes (B-cells).
What Is B Cell Non-Hodgkin’s Lymphoma In Celiac Disease and/or Gluten Sensitivity?
Gluten sensitive enteropathy is active celiac disease characterized by inflammation of the small intestinal mucosa that results from an inherited immunologic intolerance to ingested gluten.
Q: What does the inflammation do to the mucosa in the small intestine?
A: Inflammation is a cell level immune response to gluten that has these effects on the mucosa:
Damages the barely visible villi (multitudinous finger-like structures) by causing atrophy or loss.
Likely affects the structural support and microcirculation of the villus, leading to collapse of the villus.
Elongates the crypts between villi. The thickening of the crypt is not so much a response to loss of surface enterocytes but represents inflammation of the mucosa.1
Increases round cells in the lamina propria and surface epithelial cells leaving few, irregular microvilli (brush border) on the surface of villi.
Damage is most intense in the duodenum and decreases toward the large intestine.
The extent of the damage to the intestine determines the malabsorptive consequences of the disease. Both gastric and small intestinal permeability are disrupted in patients with celiac disease.2
Relationship between active celiac disease and intestinal permeability: There is a clear association between degree of mucosal damage and the intestinal-permeability ratio, and a normal ratio generally implies near-normal small intestinal structure. A raised intestinal permeability of the mucosal lining (leaky gut) could predispose to a high absorption of gluten and exacerbate an existing lesion and hence convert a latent to an overt enteropathy.3
Relationship between active celiac disease and tight junction proteins: A study of intestinal permeability showed that the expression of all junction proteins of the small intestinal lining (occludin, claudin 3, zonula occludens 1, and E-cadherin) was already decreased in early stage celiac disease when compared with non-celiac controls, showing leaky gut and confirming the above earlier study by Johnston et al. Junction protein expression correlated positively with mucosal villus structure and negatively with the number of intraepithelial lymphocytes (IELs), the intensity of small-intestinal autoantibody deposits, and serum autoantibodies. The expression of claudin 3 showed a negative correlation with diarrheal score.4
Relationship between active celiac disease and inflammation. In celiac disease there is an over production of inflammatory interleukin-15 (IL-15) which inhibits the correct removal of damaged intraepithelial lymphocytes caused by the reaction to gluten. Serum levels of IL-15 are directly correlated with the seriousness of tissue damage.5
Relationship between active celiac disease and gut microbiota. Results of a study investigating intestinal microbiota (normal bacterial residents) in patients with celiac disease suggest that with lower levels of the genus bifidobacteria, celiac patients have an imbalance in the intestinal microbiota even while on a gluten-free diet. This fact could favor the pathological process of the disorder. The concentration of bifidobacteria per gram of feces was significantly higher in healthy subjects (2.5 ± 1.5 x107 CFU/g) when compared to celiac patients (1.5 ± 0.63 x108 CFU/g).6
Relationship between active celiac disease and endoscopy technique. The most severe degree of villous atrophy was detected when distal duodenal biopsy specimens were taken in addition to a duodenal bulb biopsy specimen from either the 9- or 12-o’clock position (96.4% sensitivity; 95% CI, 79.7%-100%). The difference between the 12-o’clock position biopsy and the 3-o’clock position biopsy in detecting the most severe villous atrophy was 92% (24/26 patients) versus 65% (17/26 patients).7
Relationship between active celiac disease and diet adherence. Patients with consistent gluten free diet adherence experience symptomatic responses to dietary gluten (SRDG) faster and more severe in comparison to their prior gluten exposure possibly demonstrating an adept immunological response. Anxiety and depression also enhance the speed of symptom onset and co-existing visceral hypersensitivity is a risk factor for severe reactions to dietary gluten.8
Relationship between active celiac disease and atrial fibrillation: Patients with celiac disease, verified by intestinal biopsy, are at increased risk of atrial fibrillation. This observation is consistent with previous findings that elevation of inflammatory markers predicts atrial fibrillation.9
How Prevalent Is Gluten Sensitive Enteropathy?
Sources:
Murray JA, the widening spectrum of celiac disease. American Journal of Clinical Nutrition. Mar 1999; 69(3):354-365. [↩]
Murray JA, the widening spectrum of celiac disease. American Journal of Clinical Nutrition. Mar 1999; 69(3):354-365. [↩]
Johnston SD, Smye M, Watson RGP. Intestinal permeability and morphometric recovery in coeliac disease. Lancet. Jul 28, 2001;358(9278):259, 2p. [↩]
Rauhavirta T, Lindfors K, Koskinen O, Laurila K, Kurppa K, Saavalainen P, Mäki M, Collin P, Kaukinen K. Impaired epithelial integrity in the duodenal mucosa in early stages of celiac disease. Transl Res. 2014 Sep;164(3):223-31. doi: 10.1016/j.trsl.2014.02.006 [↩]
Stazi AV, Trinti B. Selenium status and over-expression of interleukin-15 in celiac disease and autoimmune thyroid diseases. Ann Ist Super Sanita. 2010;46(4):389-99.DOI: 10.4415/ANN_10_04_06. [↩]
Golfetto L, de Senna FD, Hermes J, Beserra BT, França Fda S, Martinello F. Lower bifidobacteria counts in adult patients with celiac disease on a gluten-free diet. Arq Gastroenterol. 2014 Apr-Jun;51(2):139-43. [↩]
Kurien M, Evans KE, Hopper AD, Hale MF, Cross SS, Sanders DS. Duodenal bulb biopsies for diagnosing adult celiac disease: is there an optimal biopsy site? Gastrointest Endosc. 2012 Jun;75(6):1190-6. doi: 10.1016/j.gie.2012.02.025. [↩]
Barratt SM, Leeds JS, Sanders DS. Factors influencing the type, timing and severity of symptomatic responses to dietary gluten in patients with biopsy-proven coeliac disease. J Gastrointestin Liver Dis. 2013 Dec;22(4):391-6. [↩]
Emilsson L, Smith JG, West J, Melander O, Ludvigsson JF. Increased risk of atrial fibrillation in patients with coeliac disease: a nationwide cohort study. Eur Heart J. 2011 Oct;32(19):2430-7. doi: 10.1093/eurheartj/ehr167. [↩]
Celiac disease is a complex inherited digestive disorder that affects I in 100 persons worldwide. This condition involves a unique immune response within the digestive tract to gluten, a protein found in the grains of wheat, barley, rye and oats. All persons with celiac disease, regardless of age, race or gender, are susceptible to intestinal damage when they eat food containing gluten or its derivatives. The treatment for celiac disease is a strict gluten-free diet that stops damage and allows recovery. Probiotics and prebiotics should be incorporated into the diet to improve the quality and balance of intestinal bacteria that inhabit the colon.
