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Abou Diwan M, Djekkoun N, Boucau MC, Corona A, Dehouck L, Biendo M, Gosselet F, Bach V, Candela P, Khorsi-Cauet H. Maternal exposure to pesticides induces perturbations in the gut microbiota and blood-brain barrier of dams and the progeny, prevented by a prebiotic. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-34969-1. [PMID: 39325129 DOI: 10.1007/s11356-024-34969-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Accepted: 09/09/2024] [Indexed: 09/27/2024]
Abstract
Exposure to pesticide residues during the first 1000 days of life can disrupt body homeostasis and contribute to chronic metabolic diseases. Perinatal chlorpyrifos (CPF) exposure alters gut microbiota (GM) balance, potentially affecting offspring's health. Given the GM influence on brain function, the primary aim is to determine if pesticide-induced dysbiosis (microbial imbalance) affects indirectly other organs, such as the blood-brain barrier (BBB). The secondary objective is to evaluate the prebiotics protective effects, particularly inulin in promoting microbial balance (symbiosis), in both mothers and offspring. A total of 15 or more female rats were divided in 4 groups: control, oral CPF-exposed (1 mg/kg/day), exposed to inulin (10 g/L), and co-exposed to CPF and inulin from pre-gestation until weaning of pups. Samples from intestines, spleen, liver, and brain microvessels underwent microbiological and biomolecular analyses. Bacterial culture assessed GM composition of living bacteria and their translocation to non-intestinal organs. RT qPCR and Western blotting detected gene expression and protein levels of tight junction markers in brain microvessels. CPF exposure caused gut dysbiosis in offspring, with decreased Lactobacillus and Bifidobacterium and increased Escherichia coli (p < 0.01) leading to bacterial translocation to the spleen and liver. CPF also decreased tight junction's gene expression levels (50 to 60% decrease of CLDN3, p < 0.05). In contrast, inulin partially mitigated these adverse effects and restored gene expression to control levels. Our findings demonstrate a causal link between GM alterations and BBB integrity disruptions. The protective effects of inulin suggest potential therapeutic strategies to counteract pesticide-induced dysbiosis.
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Affiliation(s)
- Maria Abou Diwan
- PERITOX-Périnatalité et Risques Toxiques-UMR_I 01 UPJV/INERIS, Centre Universitaire de Recherche en Santé, CURS-UPJV, University of Picardie Jules Verne, CEDEX 1, 80054, Amiens, France
- Laboratoire de La Barrière Hémato-Encéphalique (LBHE), UR 2465, University of Artois, 62300, Lens, France
| | - Narimane Djekkoun
- PERITOX-Périnatalité et Risques Toxiques-UMR_I 01 UPJV/INERIS, Centre Universitaire de Recherche en Santé, CURS-UPJV, University of Picardie Jules Verne, CEDEX 1, 80054, Amiens, France
| | - Marie-Christine Boucau
- Laboratoire de La Barrière Hémato-Encéphalique (LBHE), UR 2465, University of Artois, 62300, Lens, France
| | - Aurélie Corona
- PERITOX-Périnatalité et Risques Toxiques-UMR_I 01 UPJV/INERIS, Centre Universitaire de Recherche en Santé, CURS-UPJV, University of Picardie Jules Verne, CEDEX 1, 80054, Amiens, France
| | - Lucie Dehouck
- Laboratoire de La Barrière Hémato-Encéphalique (LBHE), UR 2465, University of Artois, 62300, Lens, France
| | - Maurice Biendo
- PERITOX-Périnatalité et Risques Toxiques-UMR_I 01 UPJV/INERIS, Centre Universitaire de Recherche en Santé, CURS-UPJV, University of Picardie Jules Verne, CEDEX 1, 80054, Amiens, France
| | - Fabien Gosselet
- Laboratoire de La Barrière Hémato-Encéphalique (LBHE), UR 2465, University of Artois, 62300, Lens, France
| | - Véronique Bach
- PERITOX-Périnatalité et Risques Toxiques-UMR_I 01 UPJV/INERIS, Centre Universitaire de Recherche en Santé, CURS-UPJV, University of Picardie Jules Verne, CEDEX 1, 80054, Amiens, France
| | - Pietra Candela
- Laboratoire de La Barrière Hémato-Encéphalique (LBHE), UR 2465, University of Artois, 62300, Lens, France
| | - Hafida Khorsi-Cauet
- PERITOX-Périnatalité et Risques Toxiques-UMR_I 01 UPJV/INERIS, Centre Universitaire de Recherche en Santé, CURS-UPJV, University of Picardie Jules Verne, CEDEX 1, 80054, Amiens, France.
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Mysonhimer AR, Brown MD, Alvarado DA, Cornman E, Esmail M, Abdiel T, Gutierrez K, Vasquez J, Cannavale CN, Miller MJ, Khan NA, Holscher HD. Honey Added to Yogurt with Bifidobacterium animalis subsp. lactis DN-173 010/CNCM I-2494 Supports Probiotic Enrichment but Does Not Reduce Intestinal Transit Time in Healthy Adults: A Randomized, Controlled, Crossover Trial. J Nutr 2024; 154:2396-2410. [PMID: 38830472 PMCID: PMC11375456 DOI: 10.1016/j.tjnut.2024.05.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 04/29/2024] [Accepted: 05/30/2024] [Indexed: 06/05/2024] Open
Abstract
BACKGROUND Honey improves probiotic survival in vitro. However, if this effect translates to humans has not been investigated. OBJECTIVES We aimed to determine effects of honey plus yogurt containing the probiotic Bifidobacterium animalis subsp. lactis DN-173 010/CNCM I-2494 (B. animalis) on intestinal transit time, probiotic enrichment, digestive health, mood, and cognition in adults. METHODS Sixty-six healthy adults (34 female; 33.6 ± 9.8 y; 24.6 ± 3.0 kg/m2) in a crossover trial were randomly assigned to 2-wk yogurt conditions in a counterbalanced order with ≥4-wk washout: 1) Honey (HON): yogurt plus honey and 2) Negative Control (NC): heat-treated yogurt plus sugar. Of the participants, n = 62 completed the trial, and n = 37 (17 female; 32.0 ± 8.3 y; 25.0 ± 2.9 kg/m2) elected to enroll in a third condition (a nonrandomized study extension) after ≥4-wk washout with a reference Positive Control (PC): yogurt plus sugar. At baseline and end of each of the 3 conditions, intestinal transit time was measured with dye capsules; probiotic abundance with fecal DNA 16S sequencing; digestive health with symptom/function records, Bristol stool consistency, Gastrointestinal Tolerability, and Gastrointestinal Quality of Life Index; mood with Positive and Negative Affect Schedule-Short Form, Depression Anxiety Stress Scales-42, Patient-Reported Outcomes Measurement Information System questionnaires, and an emotional image task; and cognition with a spatial reconstruction task. Data were analyzed using linear mixed-effects models (LMMs) with significance at P ≤ 0.05. Baseline and end data were included in the LMM, with fixed effects being treatment, time, treatment by time interaction, and baseline covariate, and the random effect being the participant. RESULTS B. animalis was enriched in HON (d = 3.54; P = 0.0002) compared to controls with linear discriminant analysis effect size. Intestinal transit time, gastrointestinal health, mood, and cognition did not differ between conditions (LMM: Ps > 0.05). CONCLUSIONS Yogurt + honey enriched B. animalis but did not reduce intestinal transit time or have other functional gastrointestinal, mood, or cognitive effects in adults. This trial was registered at www. CLINICALTRIALS gov as NCT04187950 and NCT04901390.
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Affiliation(s)
- Annemarie R Mysonhimer
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Marina D Brown
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - David A Alvarado
- Division of Nutritional Sciences, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Eva Cornman
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Myra Esmail
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Tehila Abdiel
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Karen Gutierrez
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Jorge Vasquez
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Corinne N Cannavale
- Department of Kinesiology and Community Health, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Michael J Miller
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States; Division of Nutritional Sciences, University of Illinois Urbana-Champaign, Urbana, IL, United States
| | - Naiman A Khan
- Division of Nutritional Sciences, University of Illinois Urbana-Champaign, Urbana, IL, United States; Department of Kinesiology and Community Health, University of Illinois Urbana-Champaign, Urbana, IL, United States; Neuroscience Program, University of Illinois, Urbana, IL, United States
| | - Hannah D Holscher
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, Urbana, IL, United States; Division of Nutritional Sciences, University of Illinois Urbana-Champaign, Urbana, IL, United States.
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Talukdar JR, Cooper M, Lyutvyn L, Zeraatkar D, Ali R, Berbrier R, Janes S, Ha V, Darling PB, Xue M, Chu A, Chowdhury F, Harnack HE, Huang L, Malik M, Powless J, Lavergne FV, Zhang X, Ehrlich S, Jenkins DJ, Sievenpiper JL, Banfield L, Mbuagbaw L, de Souza RJ. The effects of inulin-type fructans on cardiovascular disease risk factors: systematic review and meta-analysis of randomized controlled trials. Am J Clin Nutr 2024; 119:496-510. [PMID: 38309832 DOI: 10.1016/j.ajcnut.2023.10.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 10/21/2023] [Accepted: 10/24/2023] [Indexed: 02/05/2024] Open
Abstract
BACKGROUND Inulin-type fructans (ITF) are the leading prebiotics in the market. Available evidence provides conflicting results regarding the beneficial effects of ITF on cardiovascular disease risk factors. OBJECTIVES This study aimed to evaluate the effects of ITF supplementation on cardiovascular disease risk factors in adults. METHODS We searched MEDLINE, EMBASE, Emcare, AMED, CINAHL, and the Cochrane Library databases from inception through May 15, 2022. Eligible randomized controlled trials (RCTs) administered ITF or placebo (for example, control, foods, diets) to adults for ≥2 weeks and reported one or more of the following: low, very-low, or high-density lipoprotein cholesterol (LDL-C, VLDL-C, HDL-C); total cholesterol; apolipoprotein A1 or B; triglycerides; fasting blood glucose; body mass index; body weight; waist circumference; waist-to-hip ratio; systolic or diastolic blood pressure; or hemoglobin A1c. Two reviewers independently and in duplicate screened studies, extracted data, and assessed risk of bias. We pooled data using random-effects model, and assessed the certainty of evidence (CoE) using the Grading of Recommendations, Assessment, Development and Evaluation approach. RESULTS We identified 1767 studies and included 55 RCTs with 2518 participants in meta-analyses. The pooled estimate showed that ITF supplementation reduced LDL-C [mean difference (MD) -0.14 mmol/L, 95% confidence interval (95% CI: -0.24, -0.05), 38 RCTs, 1879 participants, very low CoE], triglycerides (MD -0.06 mmol/L, 95% CI: -0.12, -0.01, 40 RCTs, 1732 participants, low CoE), and body weight (MD -0.97 kg, 95% CI: -1.28, -0.66, 36 RCTs, 1672 participants, low CoE) but little to no significant effect on other cardiovascular disease risk factors. The effects were larger when study duration was ≥6 weeks and in pre-obese and obese participants. CONCLUSION ITF may reduce low-density lipoprotein, triglycerides, and body weight. However, due to low to very low CoE, further well-designed and executed trials are needed to confirm these effects. PROSPERO REGISTRATION NUMBER CRD42019136745.
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Affiliation(s)
- Jhalok Ronjan Talukdar
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada
| | - Matthew Cooper
- Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Lyuba Lyutvyn
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada
| | - Dena Zeraatkar
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada; Blavatnik Institute, Harvard Medical School, Boston, MA, United States
| | - Rahim Ali
- Faculty of Law, Common Law Section, University of Ottawa, Ottawa, ON, Canada
| | - Rachel Berbrier
- Division of Dermatology, McGill University Health Centre, Montreal, QC, Canada
| | - Sabrina Janes
- Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Toronto, ON, Canada
| | - Vanessa Ha
- School of Medicine, Faculty of Health Sciences, Queen's University, Kingston, ON, Canada
| | - Pauline B Darling
- School of Nutrition Sciences, University of Ottawa, Ottawa, ON, Canada
| | - Mike Xue
- Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Alexandro Chu
- Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Fariha Chowdhury
- Department of Rehabilitation Science(s), McMaster University, Hamilton, ON, Canada
| | - Hope E Harnack
- Department of Kinesiology, Faculty of Science, McMaster University, Hamilton, ON, Canada
| | - Louise Huang
- Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Mikail Malik
- Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Jacqui Powless
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada
| | - Florence V Lavergne
- School of Nutrition Sciences, Faculty of Health Sciences, University of Ottawa, ON, Canada
| | - Xuehong Zhang
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, United States; Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA, United States
| | - Shelley Ehrlich
- Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States
| | - David Ja Jenkins
- Clinical Nutrition and Risk Factor Modification Centre, St. Michael's Hospital, Toronto, ON, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada; Department of Nutritional Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Department of Medicine, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Toronto 3D Knowledge Synthesis and Clinical Trials Unit, St. Michael's Hospital, Toronto, ON, Canada; Division of Endocrinology and Metabolism, Department of Medicine, St. Michael's Hospital, Toronto, ON, Canada
| | - John L Sievenpiper
- Clinical Nutrition and Risk Factor Modification Centre, St. Michael's Hospital, Toronto, ON, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada; Department of Nutritional Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Department of Medicine, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Toronto 3D Knowledge Synthesis and Clinical Trials Unit, St. Michael's Hospital, Toronto, ON, Canada; Division of Endocrinology and Metabolism, Department of Medicine, St. Michael's Hospital, Toronto, ON, Canada
| | - Laura Banfield
- Health Sciences Library, McMaster University, Hamilton, ON, Canada; Global Health Graduate Program, McMaster University, Hamilton, ON, Canada
| | - Lawrence Mbuagbaw
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada; Department of Anesthesia, McMaster University, Hamilton, ON, Canada; Department of Pediatrics, McMaster University, Hamilton, ON, Canada; Biostatistics Unit, Father Sean O'Sullivan Research Centre, St Joseph's Healthcare, Hamilton, ON, Canada; Centre for Development of Best Practices in Health (CDBPH), Yaoundé Central Hospital, Yaoundé, Cameroon; Department of Global Health, Stellenbosch University, Cape Town, South Africa
| | - Russell J de Souza
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada; Toronto 3D Knowledge Synthesis and Clinical Trials Unit, St. Michael's Hospital, Toronto, ON, Canada; Global Health Graduate Program, McMaster University, Hamilton, ON, Canada; Department of Pediatrics, McMaster University, Hamilton, ON, Canada; Population Health Research Institute, Hamilton Health Sciences Corporation, Hamilton, ON, Canada.
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Deehan EC, Zhang Z, Nguyen NK, Perez-Muñoz ME, Cole J, Riva A, Berry D, Prado CM, Walter J. Adaptation to tolerate high doses of arabinoxylan is associated with fecal levels of Bifidobacterium longum. Gut Microbes 2024; 16:2363021. [PMID: 38860973 PMCID: PMC11174067 DOI: 10.1080/19490976.2024.2363021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 05/29/2024] [Indexed: 06/12/2024] Open
Abstract
Dietary fiber supplements are a strategy to close the 'fiber gap' and induce targeted modulations of the gut microbiota. However, higher doses of fiber supplements cause gastrointestinal (GI) symptoms that differ among individuals. What determines these inter-individual differences is insufficiently understood. Here we analyzed findings from a six-week randomized controlled trial that evaluated GI symptoms to corn bran arabinoxylan (AX; n = 15) relative to non-fermentable microcrystalline cellulose (MCC; n = 16) at efficacious supplement doses of 25 g/day (females) or 35 g/day (males) in adults with excess weight. Self-reported flatulence, bloating, and stomach aches were evaluated weekly. Bacterial taxa involved in AX fermentation were identified by bioorthogonal non-canonical amino acid tagging. Associations between GI symptoms, fecal microbiota features, and diet history were systematically investigated. AX supplementation increased symptoms during the first three weeks relative to MCC (p < 0.05, Mann-Whitney tests), but subjects 'adapted' with symptoms reverting to baseline levels toward the end of treatment. Symptom adaptations were individualized and correlated with the relative abundance of Bifidobacterium longum at baseline (rs = 0.74, p = 0.002), within the bacterial community that utilized AX (rs = 0.69, p = 0.006), and AX-induced shifts in acetate (rs = 0.54, p = 0.039). Lower baseline consumption of animal-based foods and higher whole grains associated with less severity and better adaptation. These findings suggest that humans do 'adapt' to tolerate efficacious fiber doses, and this process is linked to their microbiome and dietary factors known to interact with gut microbes, providing a basis for the development of strategies for improved tolerance of dietary fibers.
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Affiliation(s)
- Edward C. Deehan
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
- Department of Food Science and Technology, University of Nebraska, Lincoln, NE, USA
- Nebraska Food for Health Center, University of Nebraska, Lincoln, NE, USA
| | - Zhengxiao Zhang
- Department of Medicine, University of Alberta, Edmonton, Canada
- College of Food and Biological Engineering, Jimei University, Xiamen, China
| | - Nguyen K. Nguyen
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
- Metabolism and Nutrition Research Group (MNUT), Louvain Drug Research Institute (LDRI), UCLouvain, Université catholique de Louvain, Brussels, Belgium
- Walloon Excellence in Life Sciences and Biotechnology (WELBIO), WEL Research Institute, Wavre, Belgium
| | - Maria Elisa Perez-Muñoz
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
| | - Janis Cole
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
| | - Alessandra Riva
- Centre for Microbiology and Environmental Systems Science, Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, University of Vienna, Vienna, Austria
- Chair of Nutrition and Immunology, School of Life Sciences, Technical University of Munich, Freising-Weihenstephan, Germany
| | - David Berry
- Centre for Microbiology and Environmental Systems Science, Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, University of Vienna, Vienna, Austria
- Joint Microbiome Facility of the Medical University of Vienna, University of Vienna, Vienna, Austria
| | - Carla M. Prado
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
| | - Jens Walter
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
- Department of Biological Sciences, University of Alberta, Edmonton, Canada
- APC Microbiome Ireland, School of Microbiology, and Department of Medicine, University College Cork – National University of Ireland, Cork, Ireland
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Mysonhimer AR, Cannavale CN, Bailey MA, Khan NA, Holscher HD. Prebiotic Consumption Alters Microbiota but Not Biological Markers of Stress and Inflammation or Mental Health Symptoms in Healthy Adults: A Randomized, Controlled, Crossover Trial. J Nutr 2023; 153:1283-1296. [PMID: 36841506 DOI: 10.1016/j.tjnut.2023.02.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 01/26/2023] [Accepted: 02/08/2023] [Indexed: 02/27/2023] Open
Abstract
BACKGROUND Chronic stress contributes to systemic inflammation and diminished mental health. Although animal work suggests strong links with the microbiota-gut-brain axis, clinical trials investigating the effectiveness of prebiotics in improving mental health and reducing inflammation are lacking. OBJECTIVES We aimed to determine fructooligosaccharide (FOS) and galactooligosaccharide (GOS) effects on biological markers of stress and inflammation and mental health symptoms in adults. Secondary outcomes included fecal microbiota and metabolites, digestive function, emotion, and sleep. METHODS Twenty-four healthy adults (25-45 y; 14 females, 10 males; BMI, 29.3 ± 1.8 kg/m2) from central Illinois participated in a 2-period, randomized, controlled, single-blinded crossover trial. Interventions included the prebiotic (PRE) treatment (237 mL/d Lactaid low-fat 1% milk, 5 g/d FOS, 5 g/d GOS) and control (CON) (237 mL/d Lactaid), which were consumed in counterbalanced order for 4 wk each, separated by ≥4-wk washout. Inflammatory markers were measured in blood plasma (>10-h fast) and cortisol in urine. The Depression Anxiety Stress Scales-42 assessed mental health symptoms. Fecal samples were collected for 16S rRNA gene (V4 region) sequencing and analysis. Emotion was measured by rating images from a computer task. Sleep was assessed using 7-d records and accelerometers. Change scores were analyzed using linear mixed models with treatment and baseline covariate as fixed effects and participant ID as the random effect. RESULTS There were no differences in change scores between PRE and CON treatments on biological markers of stress and inflammation or mental health. PRE increased change in percent sequences (q = 0.01) of Actinobacteriota (CON: 0.46 ± 0.70%; PRE: 5.40 ± 1.67%) and Bifidobacterium (CON: -1.72 ± 0.43%; PRE: 4.92 ± 1.53%). There were also no differences in change scores between treatments for microbial metabolites, digestive function, emotion, or sleep quality. CONCLUSIONS FOS+GOS did not affect biological markers of stress and inflammation or mental health symptoms in healthy adults; however, it increased Bifidobacterium. CLINICAL TRIAL REGISTRY NCT04551937, www. CLINICALTRIALS gov.
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Affiliation(s)
| | | | - Melisa A Bailey
- Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA
| | - Naiman A Khan
- Neuroscience Program, University of Illinois, Urbana, IL, USA; Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA; Department of Kinesiology and Community Health, University of Illinois, Urbana, IL, USA
| | - Hannah D Holscher
- Department of Food Science and Human Nutrition, University of Illinois, Urbana, IL, USA; Division of Nutritional Sciences, University of Illinois, Urbana, IL, USA.
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Abstract
Inulin, a dietary fibre found in the roots of many plants, has positive effects on health. It is particularly noteworthy due to its positive impact on calcium metabolism. Inulin has significant functions, such as improving calcium absorption through passive diffusion, bolstering calcium absorption via ion exchange and expanding the absorption surface of the colon by stimulating cell growth. In addition, inulin boosts calcium absorption by increasing calcium solubility, stimulating levels of calcium-binding protein expression and increasing useful microorganisms. It increases calbindin levels and stimulates transcellular active calcium transport. An inulin intake of least 8-10 g/day supports calcium absorption and total body bone mineral content/density in adolescents through its known mechanisms of action. It also significantly enhances calcium absorption and improves bone health in postmenopausal women and adult men. Sustained and sufficient inulin supplementation in adults has a positive effect on calcium metabolism and bone mineral density.
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Affiliation(s)
- Hande Bakirhan
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Istanbul Medipol University, Istanbul, Turkey
| | - Efsun Karabudak
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Sanko University, Gaziantep, Turkey
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7
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Intestinal gas production by the gut microbiota: A review. J Funct Foods 2023. [DOI: 10.1016/j.jff.2022.105367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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8
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Mysonhimer AR, Holscher HD. Gastrointestinal Effects and Tolerance of Nondigestible Carbohydrate Consumption. Adv Nutr 2022; 13:2237-2276. [PMID: 36041173 PMCID: PMC9776669 DOI: 10.1093/advances/nmac094] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/11/2022] [Accepted: 08/25/2022] [Indexed: 01/29/2023] Open
Abstract
Nondigestible carbohydrates (NDCs) are food components, including nonstarch polysaccharides and resistant starches. Many NDCs are classified as dietary fibers by the US FDA. Because of their beneficial effects on human health and product development, NDCs are widely used in the food supply. Although there are dietary intake recommendations for total dietary fiber, there are no such recommendations for individual NDCs. NDCs are heterogeneous in their chemical composition and physicochemical properties-characteristics that contribute to their tolerable intake levels. Guidance on tolerable intake levels of different NDCs is needed because overconsumption can lead to undesirable gastrointestinal side effects, further widening the gap between actual and suggested fiber intake levels. In this review, we synthesize the literature on gastrointestinal effects of NDCs that the FDA accepts as dietary fibers (β-glucan, pectin, arabinoxylan, guar gum, alginate, psyllium husk, inulin, fructooligosaccharides and oligofructose, galactooligosaccharides, polydextrose, cellulose, soy fiber, resistant maltodextrin/dextrin) and present tolerable intake dose recommendations for their consumption. We summarized the findings from 103 clinical trials in adults without gastrointestinal disease who reported gastrointestinal effects, including tolerance (e.g., bloating, flatulence, borborygmi/rumbling) and function (e.g., transit time, stool frequency, stool consistency). These studies provided doses ranging from 0.75-160 g/d and lasted for durations ranging from a single-meal tolerance test to 28 wk. Tolerance was NDC specific; thus, recommendations ranged from 3.75 g/d for alginate to 25 g/d for soy fiber. Future studies should address gaps in the literature by testing a wider range of NDC doses and consumption forms (solid compared with liquid). Furthermore, future investigations should also adopt a standard protocol to examine tolerance and functional outcomes across studies consistently.
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Holscher HD, Chumpitazi BP, Dahl WJ, Fahey GC, Liska DJ, Slavin JL, Verbeke K. Perspective: Assessing Tolerance to Nondigestible Carbohydrate Consumption. Adv Nutr 2022; 13:2084-2097. [PMID: 36041178 PMCID: PMC9776727 DOI: 10.1093/advances/nmac091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/02/2022] [Accepted: 08/25/2022] [Indexed: 01/28/2023] Open
Abstract
Human intestinal enzymes do not hydrolyze nondigestible carbohydrates (NDCs), and thus, they are not digested and absorbed in the small intestine. Instead, NDCs are partially to completely fermented by the intestinal microbiota. Select NDCs are associated with health benefits such as laxation and lowering of blood cholesterol and glucose. NDCs provide functional attributes to processed foods, including sugar or fat replacers, thickening agents, and bulking agents. Additionally, NDCs are incorporated into processed foods to increase their fiber content. Although consumption of NDCs can benefit health and contribute functional characteristics to foods, they can cause gastrointestinal symptoms, such as flatulence and bloating. As gastrointestinal symptoms negatively affect consumer well-being and their acceptance of foods containing NDC ingredients, it is crucial to consider tolerance when designing food products and testing their physiological health benefits in clinical trials. This perspective provides recommendations for the approach to assess gastrointestinal tolerance to NDCs, with a focus on study design, population criteria, intervention, comparator, and outcome. Special issues related to studies in children and implications for stakeholders are also discussed. It is recommended that the evaluation of gastrointestinal tolerance to NDCs be conducted in randomized, blinded, controlled crossover studies using standard gastrointestinal questionnaires, with attention to study participant background diets, health status, lifestyle, and medications.
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Affiliation(s)
- Hannah D Holscher
- Department of Food Science and Human Nutrition, University of Illinois, Urbana, IL, USA
| | - Bruno P Chumpitazi
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA; Children's Nutrition Research Center, United States Department of Agriculture, Houston, TX, USA
| | - Wendy J Dahl
- Department of Food Science and Human Nutrition, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL, USA
| | - George C Fahey
- Department of Animal Sciences, University of Illinois, Urbana, IL USA
| | | | - Joanne L Slavin
- Department of Food Science and Nutrition, University of Minnesota, Twin Cities, MN USA
| | - Kristin Verbeke
- Translational Research in Gastrointestinal Disorders, KU Leuven, Targid, Leuven, Belgium; and Leuven Food Science and Nutrition Research Centre, Leuven, Belgium
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Therapeutic Benefits and Dietary Restrictions of Fiber Intake: A State of the Art Review. Nutrients 2022; 14:nu14132641. [PMID: 35807822 PMCID: PMC9268622 DOI: 10.3390/nu14132641] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/21/2022] [Accepted: 06/23/2022] [Indexed: 02/04/2023] Open
Abstract
Throughout history, malnutrition and deficiency diseases have been a problem for our planet’s population. A balanced diet significantly influences everyone’s health, and fiber intake appears to play a more important role than previously thought. The natural dietary fibers are a category of carbohydrates in the constitution of plants that are not completely digested in the human intestine. High-fiber foods, such as fruits, vegetables and whole grains, have consistently been highly beneficial to health and effectively reduced the risk of disease. Although the mode of action of dietary fiber in the consumer body is not fully understood, nutritionists and health professionals unanimously recognize the therapeutic benefits. This paper presents the fiber consumption in different countries, the metabolism of fiber and the range of health benefits associated with fiber intake. In addition, the influence of fiber intake on the intestinal microbiome, metabolic diseases (obesity and diabetes), neurological aspects, cardiovascular diseases, autoimmune diseases and cancer prevention are discussed. Finally, dietary restrictions and excess fiber are addressed, which can cause episodes of diarrhea and dehydration and increase the likelihood of bloating and flatulence or even bowel obstruction. However, extensive studies are needed regarding the composition and required amount of fiber in relation to the metabolism of saprotrophic microorganisms from the enteral level and the benefits of the various pathologies with which they can be correlated.
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Agavins Impact on Gastrointestinal Tolerability-Related Symptoms during a Five-Week Dose-Escalation Intervention in Lean and Obese Mexican Adults: Exploratory Randomized Clinical Trial. Foods 2022; 11:foods11050670. [PMID: 35267303 PMCID: PMC8909258 DOI: 10.3390/foods11050670] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 01/31/2022] [Accepted: 02/01/2022] [Indexed: 11/21/2022] Open
Abstract
Agavins are prebiotics and functional fiber that modulated the gut microbiota and metabolic status in obese mice. Here, we designed a placebo-controlled, double-blind, exploratory study to assess fluctuations in gastrointestinal (GI) tolerability-related symptoms to increasing doses of agavins in 38 lean and obese Mexican adults for five weeks and their impact on subjective appetite, satiety, metabolic markers, and body composition. All GI symptoms showed higher scores than placebo at almost every dose for both lean and obese groups. Flatulence caused an intense discomfort in the lean-agavins group at 7 g/day, while obese-agavins reported a mild-to-moderate effect for all five symptoms: no significant differences among 7, 10, and 12 g/day for flatulence, bloating, and diarrhea. Ratings for any GI symptom differed between 10 and 12 g/day in neither group. The inter-group comparison demonstrated a steady trend in GI symptoms scores in obese participants not seen for lean volunteers that could improve their adherence to larger trials. Only body weight after 10 g/day reduced from baseline conditions in obese-agavins, with changes in triglycerides and very-low-density lipoproteins compared to placebo at 5 g/day, and in total cholesterol for 10 g/day. Altogether, these results would help design future trials to evaluate agavins impact on obese adults.
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12
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Park JH, Song WS, Lee J, Jo SH, Lee JS, Jeon HJ, Kwon JE, Kim YR, Baek JH, Kim MG, Yang YH, Kim BG, Kim YG. An Integrative Multiomics Approach to Characterize Prebiotic Inulin Effects on Faecalibacterium prausnitzii. Front Bioeng Biotechnol 2022; 10:825399. [PMID: 35252133 PMCID: PMC8894670 DOI: 10.3389/fbioe.2022.825399] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/24/2022] [Indexed: 12/12/2022] Open
Abstract
Faecalibacterium prausnitzii, a major commensal bacterium in the human gut, is well known for its anti-inflammatory effects, which improve host intestinal health. Although several studies have reported that inulin, a well-known prebiotic, increases the abundance of F. prausnitzii in the intestine, the mechanism underlying this effect remains unclear. In this study, we applied liquid chromatography tandem mass spectrometry (LC-MS/MS)-based multiomics approaches to identify biological and enzymatic mechanisms of F. prausnitzii involved in the selective digestion of inulin. First, to determine the preference for dietary carbohydrates, we compared the growth of F. prausnitzii in several carbon sources and observed selective growth in inulin. In addition, an LC-MS/MS-based intracellular proteomic and metabolic profiling was performed to determine the quantitative changes in specific proteins and metabolites of F. prausnitzii when grown on inulin. Interestingly, proteomic analysis revealed that the putative proteins involved in inulin-type fructan utilization by F. prausnitzii, particularly β-fructosidase and amylosucrase were upregulated in the presence of inulin. To investigate the function of these proteins, we overexpressed bfrA and ams, genes encoding β-fructosidase and amylosucrase, respectively, in Escherichia coli, and observed their ability to degrade fructan. In addition, the enzyme activity assay demonstrated that intracellular fructan hydrolases degrade the inulin-type fructans taken up by fructan ATP-binding cassette transporters. Furthermore, we showed that the fructose uptake activity of F. prausnitzii was enhanced by the fructose phosphotransferase system transporter when inulin was used as a carbon source. Intracellular metabolomic analysis indicated that F. prausnitzii could use fructose, the product of inulin-type fructan degradation, as an energy source for inulin utilization. Taken together, this study provided molecular insights regarding the metabolism of F. prauznitzii for inulin, which stimulates the growth and activity of the beneficial bacterium in the intestine.
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Affiliation(s)
- Ji-Hyeon Park
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Won-Suk Song
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Jeongchan Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul, South Korea
| | - Sung-Hyun Jo
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Jae-Seung Lee
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Hyo-Jin Jeon
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Ji-Eun Kwon
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Ye-Rim Kim
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Ji-Hyun Baek
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Min-Gyu Kim
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
| | - Yung-Hun Yang
- Department of Biological Engineering, Konkuk University, Seoul, South Korea
| | - Byung-Gee Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul, South Korea
| | - Yun-Gon Kim
- Department of Chemical Engineering, Soongsil University, Seoul, South Korea
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Hughes RL, Alvarado DA, Swanson KS, Holscher HD. The Prebiotic Potential of Inulin-type Fructans: A Systematic Review. Adv Nutr 2021; 13:S2161-8313(22)00074-6. [PMID: 34555168 PMCID: PMC8970830 DOI: 10.1093/advances/nmab119] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Inulin-type fructans (ITF), including short-chain fructooligosaccharides (scFOS), oligofructose, and inulin, are commonly used fibers that are widely regarded as prebiotic for their ability to be selectively utilized by the intestinal microbiota to confer a health benefit. However, the literature thus far lacks a thorough discussion of the evidence from human clinical trials for the prebiotic effect of ITF, including both effects on the intestinal microbiota composition as well as the intestinal and extraintestinal (e.g., glucose homeostasis, lipids, mineral absorption and bone health, appetite and satiety, inflammation and immune function, and body composition) benefits. Additionally, there is a lack of discussion regarding aspects such as the effect of ITF chain length on its intestinal and extraintestinal effects. The overall objective of this systematic review was to summarize the prebiotic potential of ITF based on the results of human clinical trials in healthy adult populations. Evidence from studies included in the current review suggest that ITF have a prebiotic effect on the intestinal microbiota, promoting the abundances of Bifidobacterium, Lactobacillus, and Faecalibacterium prausnitzii. Beneficial health effects reported following ITF intake include improved intestinal barrier function, improved laxation, increased insulin sensitivity, decreased triglycerides and an improved lipid profile, increased absorption of calcium and magnesium, and increased satiety. While there is some evidence for differing effects of ITF based on chain length, lack of direct comparisons and detailed descriptions of physicochemical properties limit the ability to draw conclusions from human clinical studies. Future research should focus on elucidating the mechanisms by which the intestinal microbiota mediates or modifies the effects of ITF on human health and the contribution of individual factors such as age and metabolic health to move towards personalization of prebiotic application.
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Affiliation(s)
- Riley L Hughes
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | - David A Alvarado
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Champaign, IL, USA
| | | | - Hannah D Holscher
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Champaign, IL, USA,Division of Nutrition Sciences, University of Illinois at Urbana-Champaign, Champaign, IL, USA
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14
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Biruete A, Cross TWL, Allen JM, Kistler BM, de Loor H, Evenepoel P, Fahey GC, Bauer L, Swanson KS, Wilund KR. Effect of Dietary Inulin Supplementation on the Gut Microbiota Composition and Derived Metabolites of Individuals Undergoing Hemodialysis: A Pilot Study. J Ren Nutr 2021; 31:512-522. [PMID: 34120835 PMCID: PMC8403151 DOI: 10.1053/j.jrn.2020.10.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 10/08/2020] [Accepted: 10/20/2020] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE The prebiotic fiber inulin has been studied in individuals undergoing hemodialysis (HD) due to its ability to reduce gut microbiota-derived uremic toxins. However, studies examining the effects of inulin on the gut microbiota and derived metabolites are limited in these patients. We aimed to assess the impact of a 4-week supplementation of inulin on the gut microbiota composition and microbial metabolites of patients on HD. DESIGN AND METHODS In a randomized, double-blind, placebo-controlled, crossover study, twelve HD patients (55 ± 10 y, 50% male, 58% Black American, BMI 31.6 ± 8.9 kg/m2, 33% diabetes mellitus) were randomized to consume inulin [10 g/d for females; 15 g/d for males] or maltodextrin [6 g/d for females; 9 g/d for males] for 4 weeks, with a 4-week washout period. We assessed the fecal microbiota composition, fecal metabolites (short-chain fatty acids (SCFA), phenols, and indoles), and plasma indoxyl sulfate and p-cresyl sulfate. RESULTS At baseline, factors that explained the gut microbiota variability included BMI category and type of phosphate binder prescribed. Inulin increased the relative abundance of the phylum Verrucomicrobia and its genus Akkermansia (P interaction = 0.045). Inulin and maltodextrin resulted in an increased relative abundance of the phylum Bacteroidetes and its genus Bacteroides (P time = 0.04 and 0.03, respectively). Both treatments increased the fecal acetate and propionate (P time = 0.032 and 0.027, respectively), and there was a trend toward increased fecal butyrate (P time = 0.06). Inulin did not reduce fecal p-cresol or indoles, or plasma concentrations of p-cresyl sulfate or indoxyl sulfate. CONCLUSIONS A 4-week supplementation of inulin did not lead to major shifts in the fecal microbiota and gut microbiota-derived metabolites. This may be due to high variability among participants and an unexpected increase in fecal excretion of SCFA with maltodextrin. Larger studies are needed to determine the effects of prebiotic fibers on the gut microbiota and clinical outcomes to justify their use in patients on HD.
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Affiliation(s)
- Annabel Biruete
- Division of Nutritional Sciences, University of Illinois, Urbana, Illinois; Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Tzu-Wen L Cross
- Division of Nutritional Sciences, University of Illinois, Urbana, Illinois; Department of Nutrition Science, Purdue University, West Lafayette, Indiana
| | - Jacob M Allen
- Department of Kinesiology and Community Health, University of Illinois, Urbana, Illinois
| | - Brandon M Kistler
- Department of Nutrition and Health Science, Ball State University, Muncie, Indiana
| | - Henriette de Loor
- KU Leuven Department of Microbiology and Immunology, Laboratory of Nephrology, Leuven, Belgium
| | - Pieter Evenepoel
- KU Leuven Department of Microbiology and Immunology, Laboratory of Nephrology, Leuven, Belgium; Department of Nephrology and Renal Transplantation, University Hospitals Leuven, Leuven, Belgium
| | - George C Fahey
- Department of Animal Sciences, University of Illinois, Urbana, Illinois
| | - Laura Bauer
- Department of Animal Sciences, University of Illinois, Urbana, Illinois
| | - Kelly S Swanson
- Division of Nutritional Sciences, University of Illinois, Urbana, Illinois; Department of Animal Sciences, University of Illinois, Urbana, Illinois
| | - Kenneth R Wilund
- Division of Nutritional Sciences, University of Illinois, Urbana, Illinois; Department of Kinesiology and Community Health, University of Illinois, Urbana, Illinois.
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16
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Dietary fiber and the microbiota: A narrative review by a group of experts from the Asociación Mexicana de Gastroenterología. REVISTA DE GASTROENTEROLOGÍA DE MÉXICO 2021; 86:287-304. [PMID: 34144942 DOI: 10.1016/j.rgmxen.2021.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 02/12/2021] [Indexed: 12/12/2022]
Abstract
Dietary fiber intake is one of the most influential and efficacious strategies for modulating the gut microbiota. Said fiber can be digested by the microbiota itself, producing numerous metabolites, which include the short-chain fatty acids (SCFAs). SCFAs have local and systemic functions that impact the composition and function of the gut microbiota, and consequently, human health. The aim of the present narrative review was to provide a document that serves as a frame of reference for a clear understanding of dietary fiber and its direct and indirect effects on health. The direct benefits of dietary fiber intake can be dependent on or independent of the gut microbiota. The use of dietary fiber by the gut microbiota involves several factors, including the fiber's physiochemical characteristics. Dietary fiber type influences the gut microbiota because not all bacterial species have the same capacity to produce the enzymes needed for its degradation. A low-fiber diet can affect the balance of the SCFAs produced. Dietary fiber indirectly benefits cardiometabolic health, digestive health, certain functional gastrointestinal disorders, and different diseases.
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17
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Abreu Y Abreu AT, Milke-García MP, Argüello-Arévalo GA, Calderón-de la Barca AM, Carmona-Sánchez RI, Consuelo-Sánchez A, Coss-Adame E, García-Cedillo MF, Hernández-Rosiles V, Icaza-Chávez ME, Martínez-Medina JN, Morán-Ramos S, Ochoa-Ortiz E, Reyes-Apodaca M, Rivera-Flores RL, Zamarripa-Dorsey F, Zárate-Mondragón F, Vázquez-Frias R. Dietary fiber and the microbiota: A narrative review by a group of experts from the Asociación Mexicana de Gastroenterología. REVISTA DE GASTROENTEROLOGÍA DE MÉXICO 2021. [PMID: 34088566 DOI: 10.1016/j.rgmx.2021.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Dietary fiber intake is one of the most influential and efficacious strategies for modulating the gut microbiota. Said fiber can be digested by the microbiota itself, producing numerous metabolites, which include the short-chain fatty acids (SCFAs). SCFAs have local and systemic functions that impact the composition and function of the gut microbiota, and consequently, human health. The aim of the present narrative review was to provide a document that serves as a frame of reference for a clear understanding of dietary fiber and its direct and indirect effects on health. The direct benefits of dietary fiber intake can be dependent on or independent of the gut microbiota. The use of dietary fiber by the gut microbiota involves several factors, including the fiber's physiochemical characteristics. Dietary fiber type influences the gut microbiota because not all bacterial species have the same capacity to produce the enzymes needed for its degradation. A low-fiber diet can affect the balance of the SCFAs produced. Dietary fiber indirectly benefits cardiometabolic health, digestive health, certain functional gastrointestinal disorders, and different diseases.
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Affiliation(s)
| | - M P Milke-García
- Dirección de Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Ciudad de México, México
| | - G A Argüello-Arévalo
- Departamento de Gastroenterología y Nutrición Pediátrica, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - A M Calderón-de la Barca
- Departamento Nutrición y Metabolismo, Centro de Investigación en Alimentación y Desarrollo, Hermosillo, Sonora, México
| | | | - A Consuelo-Sánchez
- Departamento de Gastroenterología y Nutrición, Instituto Nacional de Salud Hospital Infantil de México Federico Gómez, Ciudad de México, México
| | - E Coss-Adame
- Departamento de Gastroenterología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Ciudad de México, México
| | - M F García-Cedillo
- Departamento de Gastroenterología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Ciudad de México, México
| | - V Hernández-Rosiles
- Departamento de Gastroenterología y Nutrición, Instituto Nacional de Salud Hospital Infantil de México Federico Gómez, Ciudad de México, México
| | | | - J N Martínez-Medina
- Unidad de Genómica de Poblaciones aplicada a la Salud, Instituto Nacional de Medicina Genómica, Ciudad de México, México
| | - S Morán-Ramos
- Unidad de Genómica de Poblaciones aplicada a la Salud, Instituto Nacional de Medicina Genómica, Consejo Nacional de Ciencia y Tecnología, Ciudad de México, México
| | | | - M Reyes-Apodaca
- Departamento de Gastroenterología y Nutrición, Instituto Nacional de Salud Hospital Infantil de México Federico Gómez, Ciudad de México, México
| | - R L Rivera-Flores
- Laboratorio de Investigación en Gastro-Hepatología, Instituto Mexicano del Seguro Social, Ciudad de México, México
| | - F Zamarripa-Dorsey
- Departamento de Gastroenterología, Hospital Juárez de México, Ciudad de México, México
| | - F Zárate-Mondragón
- Departamento de Gastroenterología, Instituto Nacional de Pediatría, Ciudad de México, México
| | - R Vázquez-Frias
- Departamento de Gastroenterología y Nutrición, Instituto Nacional de Salud Hospital Infantil de México Federico Gómez, Ciudad de México, México.
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Verma DK, Patel AR, Thakur M, Singh S, Tripathy S, Srivastav PP, Chávez-González ML, Gupta AK, Aguilar CN. A review of the composition and toxicology of fructans, and their applications in foods and health. J Food Compost Anal 2021. [DOI: 10.1016/j.jfca.2021.103884] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Protocol for a pilot single-centre, parallel-arm, randomised controlled trial of dietary inulin to improve gut health in solid organ transplantation: the DIGEST study. BMJ Open 2021. [PMCID: PMC8039234 DOI: 10.1136/bmjopen-2021-049184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Introduction Kidney transplantation remains the best treatment for end-stage kidney disease, however the requirement for indefinite immunosuppression increases the risk of cardiovascular disease, cancer and infection, leading to a reduction in long-term patient and graft survival. The gut microbiome is a critical determinant of health and modulates host immunity and metabolism through a number of recognised pathways, including through the production of immunomodulatory short-chain fatty acids (SCFA). Dietary supplementation with non-digestible fibre can augment the microbial production of SCFA and lead to favourable immune and metabolic outcomes, although this has yet to be shown in human kidney transplant recipients. Methods and analysis Dietary inulin for gut health in solid-organ transplantation (DIGEST) is a single-centre, unblinded, pilot parallel-arm randomised controlled trial designed to assess the feasibility and adherence of dietary inulin, a naturally occurring dietary fibre, in the early post-transplant period in kidney transplant recipients. Participants will be randomised at day 28 post-transplant to a 4-week period of dietary inulin (10–20 g/day) in addition to standard care, or standard care alone, and followed-up until week 12 post-transplant. The primary outcomes of the study are: (i) the feasibility of participant recruitment, randomisation and retention; (ii) adherence to the intervention (inulin) and (iii) the tolerability of inulin determined by changes in gastrointestinal symptoms as scored on the Gastrointestinal Symptom Rating Scale. Secondary outcomes include: (1) glycaemic variability determined by continuous glucose monitoring; (2) abundance of SCFA-producing microbiota, as determined by 16s rRNA sequencing of the faecal metagenome; (3) serum SCFA concentrations; (4) peripheral blood immune cell populations; (5) recipient inflammatory and metabolic profiles and (6) the incidence of biopsy-proven acute rejection and kidney function determined by estimated glomerular filtration rate. Ethics and dissemination All study visits, clinical and laboratory assessments will be integrated into usual post-transplant care, creating no additional healthcare encounters or procedures. The risks associated with this study are minor. Inulin has been shown to be well tolerated across a variety of cohorts, with the occurrence of short-term adverse gastrointestinal symptoms self-limiting. However, with gastrointestinal adverse events common following kidney transplantation, the tolerability of inulin in this cohort remains unknown. The results of DIGEST will be published in peer-reviewed journals and presented at academic conferences. This study has been approved by the Sydney Local Health District’s Ethics Committee (Royal Prince Alfred Hospital Zone). Trial registration number ACTRN12620000623998.
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Alyousif Z, Mendoza DR, Auger J, De Carvalho V, Amos S, Sims C, Dahl WJ. Gastrointestinal Tolerance and Microbiome Response to Snacks Fortified with Pea Hull Fiber: A Randomized Trial in Older Adults. Curr Dev Nutr 2020; 4:nzaa005. [PMID: 32025615 PMCID: PMC6994441 DOI: 10.1093/cdn/nzaa005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 12/31/2019] [Accepted: 01/14/2020] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Consuming foods with added fiber may help older adults achieve fiber recommendations; however, many high-fiber ingredients have little effect on laxation and may contribute to unpleasant gastrointestinal side effects. OBJECTIVES The aim of the study was to determine the effects of consuming snacks fortified with pea hull fiber (PHF) on stool frequency and form, gastrointestinal symptoms, and appetite in older adults. An exploratory aim was to determine if PHF altered the microbiota profile. METHODS A 10-wk, randomized, blinded, crossover study was carried out. Following a 2-wk baseline period, participants [aged (mean ± SD) 69.7 ± 6.5 y; n = 31; 14 men, 17 women] consumed snacks providing 10 g/d of PHF or a control, each for 2-wk periods followed by 2-wk washouts. Participants used the Bristol Stool Form Scale (BSFS) to record daily stool frequency and gastrointestinal symptoms, and completed the Gastrointestinal Symptom Rating Scale (GSRS) and Simplified Nutritional Appetite Questionnaire (SNAQ) biweekly. One stool was collected per period for 16S ribosomal RNA high-throughput amplicon sequencing of the fecal microbiota profile. RESULTS Participants reported 1.63 ± 0.05 stools/d and 76.6% normal transit stool form at baseline and no change with PHF. GSRS syndrome scores were similarly unchanged. Daily abdominal noises and bloating were higher for PHF versus control, and flatulence was higher for PHF versus baseline, suggesting fermentation in some individuals. There was no evidence to suggest a common PHF-induced microbiome response for the group as a whole; however, a subgroup of participants (n = 7) who responded with increased flatulence (fermenters), harbored many different taxa than nonfermenters, and demonstrated lower abundance of Clostridiales with PHF. Appetite was unchanged with PHF. CONCLUSIONS PHF did not modulate stool form or frequency in older adults with normal bowel habits. Because snacks fortified with PHF did not suppress appetite, PHF may be an appropriate fiber source for older adults at nutritional risk. Microbiome profile may be predictive of gastrointestinal symptom response to PHF. This trial was registered at www.clinicaltrials.gov as NCT02778230.
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Affiliation(s)
- Zainab Alyousif
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
| | - Daniela Rivero Mendoza
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
| | - Jérémie Auger
- Rosell Institute for Microbiome and Probiotics, Montreal, Quebec, Canada
| | | | - Samantha Amos
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
| | - Charles Sims
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
| | - Wendy J Dahl
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, FL, USA
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The Impact of Pectin Supplementation on Intestinal Barrier Function in Healthy Young Adults and Healthy Elderly. Nutrients 2019; 11:nu11071554. [PMID: 31324040 PMCID: PMC6683049 DOI: 10.3390/nu11071554] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 07/01/2019] [Accepted: 07/08/2019] [Indexed: 02/08/2023] Open
Abstract
Intestinal barrier function is suggested to decrease with aging and may be improved by pectin intake. The aim of this study was to investigate the effects of four weeks pectin supplementation on gastrointestinal barrier function in vivo and ex vivo in different age groups. In a randomized, double-blind, placebo-controlled, parallel study, 52 healthy young adults (18-40 years) and 48 healthy elderly (65-75 years) received 15 g/day pectin or placebo for four weeks. Pre- and post-intervention, in vivo gastrointestinal permeability by a multisugar test, and defense capacity in mucosal samples were assessed. Sigmoid biopsies were collected post-intervention from subgroups for Ussing chamber experiments and gene transcription of barrier-related genes. Pectin intervention did not affect in vivo gastroduodenal, small intestinal, colonic, and whole gut permeability in young adults nor in elderly (p ≥ 0.130). Salivary and fecal sIgA and serum IgA were not significantly different between pectin versus placebo in both age groups (p ≥ 0.128). In both young adults and elderly, no differences in transepithelial electrical resistance and fluorescein flux (p ≥ 0.164) and relative expression of genes analyzed (p ≥ 0.222) were found between pectin versus placebo. In conclusion, intestinal barrier function was not affected by four weeks pectin supplementation neither in healthy young adults nor in healthy elderly.
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Holscher HD. Dietary fiber and prebiotics and the gastrointestinal microbiota. Gut Microbes 2017; 8:172-184. [PMID: 28165863 PMCID: PMC5390821 DOI: 10.1080/19490976.2017.1290756] [Citation(s) in RCA: 918] [Impact Index Per Article: 131.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 01/21/2017] [Accepted: 01/30/2017] [Indexed: 02/07/2023] Open
Abstract
The gastrointestinal microbiota has an important role in human health, and there is increasing interest in utilizing dietary approaches to modulate the composition and metabolic function of the microbial communities that colonize the gastrointestinal tract to improve health, and prevent or treat disease. One dietary strategy for modulating the microbiota is consumption of dietary fiber and prebiotics that can be metabolized by microbes in the gastrointestinal tract. Human alimentary enzymes are not able to digest most complex carbohydrates and plant polysaccharides. Instead, these polysaccharides are metabolized by microbes which generate short-chain fatty acids (SCFAs), including acetate, propionate, and butyrate. This article reviews the current knowledge of the impact of fiber and prebiotic consumption on the composition and metabolic function of the human gastrointestinal microbiota, including the effects of physiochemical properties of complex carbohydrates, adequate intake and treatment dosages, and the phenotypic responses related to the composition of the human microbiota.
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Affiliation(s)
- Hannah D. Holscher
- Department of Food Science and Human Nutrition and Division of Nutritional Sciences, University of Illinois, 361 Edward R. Madigan Laboratory, Urbana, IL USA
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Dahl WJ, Agro NC, Eliasson ÅM, Mialki KL, Olivera JD, Rusch CT, Young CN. Health Benefits of Fiber Fermentation. J Am Coll Nutr 2017; 36:127-136. [PMID: 28067588 DOI: 10.1080/07315724.2016.1188737] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Although fiber is well recognized for its effect on laxation, increasing evidence supports the role of fiber in the prevention and treatment of chronic disease. The aim of this review is to provide an overview of the health benefits of fiber and its fermentation, and describe how the products of fermentation may influence disease risk and treatment. Higher fiber intakes are associated with decreased risk of cardiovascular disease, type 2 diabetes, and some forms of cancer. Fiber may also have a role in lowering blood pressure and in preventing obesity by limiting weight gain. Fiber is effective in managing blood glucose in type 2 diabetes, useful for weight loss, and may provide therapeutic adjunctive roles in kidney and liver disease. In addition, higher fiber diets are not contraindicated in inflammatory bowel disease or irritable bowel syndrome and may provide some benefit. Common to the associations with disease reduction is fermentation of fiber and its potential to modulate microbiota and its activities and inflammation, specifically the production of anti-inflammatory short chain fatty acids, primarily from saccharolytic fermentation, versus the deleterious products of proteolytic activity. Because fiber intake is inversely associated with all-cause mortality, mechanisms by which fiber may reduce chronic disease risk and provide therapeutic benefit to those with chronic disease need further elucidation and large, randomized controlled trials are needed to confirm causality.Teaching Points• Strong evidence supports the association between higher fiber diets and reduced risk of cardiovascular disease, type 2 diabetes, and some forms of cancer.• Higher fiber intakes are associated with lower body weight and body mass index, and some types of fiber may facilitate weight loss.• Fiber is recommended as an adjunctive medical nutritional therapy for type 2 diabetes, chronic kidney disease, and certain liver diseases.• Fermentation and the resulting shifts in microbiota composition and its activity may be a common means by which fiber impacts disease risk and management.
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Affiliation(s)
- Wendy J Dahl
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
| | - Nicole C Agro
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
| | - Åsa M Eliasson
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
| | - Kaley L Mialki
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
| | - Joseph D Olivera
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
| | - Carley T Rusch
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
| | - Carly N Young
- a Food Science and Human Nutrition Department , University of Florida/IFAS , Gainesville , Florida
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HAMAGUCHI N, HIRAI H, BITO H, OGAWA K. Effects of Resistant Glucan Mixture on Bowel Movement in Female Volunteers. J Nutr Sci Vitaminol (Tokyo) 2016; 62:62-6. [DOI: 10.3177/jnsv.62.62] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Holscher HD, Bauer LL, Gourineni V, Pelkman CL, Fahey GC, Swanson KS. Agave Inulin Supplementation Affects the Fecal Microbiota of Healthy Adults Participating in a Randomized, Double-Blind, Placebo-Controlled, Crossover Trial. J Nutr 2015; 145:2025-32. [PMID: 26203099 DOI: 10.3945/jn.115.217331] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 06/30/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Prebiotics resist digestion, providing fermentable substrates for select gastrointestinal bacteria associated with health and well-being. Agave inulin differs from other inulin type fibers in chemical structure and botanical origin. Preclinical animal research suggests these differences affect bacterial utilization and physiologic outcomes. Thus, research is needed to determine whether these effects translate to healthy adults. OBJECTIVE We evaluated agave inulin utilization by the gastrointestinal microbiota by measuring fecal fermentative end products and bacterial taxa. METHODS A randomized, double-blind, placebo-controlled, 3-period, crossover trial was undertaken in healthy adults (n = 29). Participants consumed 0, 5.0, or 7.5 g agave inulin/d for 21 d with 7-d washouts between periods. Participants recorded daily dietary intake; fecal samples were collected during days 16-20 of each period and were subjected to fermentative end product analysis and 16S Illumina sequencing. RESULTS Fecal Actinobacteria and Bifidobacterium were enriched (P < 0.001) 3- and 4-fold after 5.0 and 7.5 g agave inulin/d, respectively, compared with control. Desulfovibrio were depleted 40% with agave inulin compared with control. Agave inulin tended (P < 0.07) to reduce fecal 4-methyphenol and pH. Bivariate correlations revealed a positive association between intakes of agave inulin (g/kcal) and Bifidobacterium (r = 0.41, P < 0.001). Total dietary fiber intake (total fiber plus 0, 5.0, or 7.5 g agave inulin/d) per kilocalorie was positively associated with fecal butyrate (r = 0.30, P = 0.005), tended to be positively associated with Bifidobacterium (r = 0.19, P = 0.08), and was negatively correlated with Desulfovibrio abundance (r = -0.31, P = 0.004). CONCLUSIONS Agave inulin supplementation shifted the gastrointestinal microbiota composition and activity in healthy adults. Further investigation is warranted to determine whether the observed changes translate into health benefits in human populations. This trial was registered at clinicaltrials.gov as NCT01925560.
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Affiliation(s)
| | - Laura L Bauer
- Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, IL; and
| | | | | | - George C Fahey
- Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, IL; and
| | - Kelly S Swanson
- Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, IL; and
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Implication of fructans in health: immunomodulatory and antioxidant mechanisms. ScientificWorldJournal 2015; 2015:289267. [PMID: 25961072 PMCID: PMC4417592 DOI: 10.1155/2015/289267] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 01/29/2015] [Accepted: 03/06/2015] [Indexed: 12/30/2022] Open
Abstract
Previous studies have shown that fructans, a soluble dietary fiber, are beneficial to human health and offer a promising approach for the treatment of some diseases. Fructans are nonreducing carbohydrates composed of fructosyl units and terminated by a single glucose molecule. These carbohydrates may be straight or branched with varying degrees of polymerization. Additionally, fructans are resistant to hydrolysis by human digestive enzymes but can be fermented by the colonic microbiota to produce short chain fatty acids (SCFAs), metabolic by-products that possess immunomodulatory activity. The indirect role of fructans in stimulating probiotic growth is one of the mechanisms through which fructans exert their prebiotic activity and improve health or ameliorate disease. However, a more direct mechanism for fructan activity has recently been suggested; fructans may interact with immune cells in the intestinal lumen to modulate immune responses in the body. Fructans are currently being studied for their potential as “ROS scavengers” that benefit intestinal epithelial cells by improving their redox environment. In this review, we discuss recent advances in our understanding of fructans interaction with the intestinal immune system, the gut microbiota, and other components of the intestinal lumen to provide an overview of the mechanisms underlying the effects of fructans on health and disease.
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Franco-Robles E, López MG. Implication of fructans in health: immunomodulatory and antioxidant mechanisms. ScientificWorldJournal 2015. [PMID: 25961072 DOI: 10.1155/2015/289367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2023] Open
Abstract
Previous studies have shown that fructans, a soluble dietary fiber, are beneficial to human health and offer a promising approach for the treatment of some diseases. Fructans are nonreducing carbohydrates composed of fructosyl units and terminated by a single glucose molecule. These carbohydrates may be straight or branched with varying degrees of polymerization. Additionally, fructans are resistant to hydrolysis by human digestive enzymes but can be fermented by the colonic microbiota to produce short chain fatty acids (SCFAs), metabolic by-products that possess immunomodulatory activity. The indirect role of fructans in stimulating probiotic growth is one of the mechanisms through which fructans exert their prebiotic activity and improve health or ameliorate disease. However, a more direct mechanism for fructan activity has recently been suggested; fructans may interact with immune cells in the intestinal lumen to modulate immune responses in the body. Fructans are currently being studied for their potential as "ROS scavengers" that benefit intestinal epithelial cells by improving their redox environment. In this review, we discuss recent advances in our understanding of fructans interaction with the intestinal immune system, the gut microbiota, and other components of the intestinal lumen to provide an overview of the mechanisms underlying the effects of fructans on health and disease.
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Affiliation(s)
- Elena Franco-Robles
- Centro de Investigación y de Estudios Avanzados del IPN, Unidad Irapuato, Km 9.6 Libramiento Norte Carretera Irapuato-León, 36821 Irapuato, GTO, Mexico
| | - Mercedes G López
- Centro de Investigación y de Estudios Avanzados del IPN, Unidad Irapuato, Km 9.6 Libramiento Norte Carretera Irapuato-León, 36821 Irapuato, GTO, Mexico
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Schaafsma G, Slavin JL. Significance of Inulin Fructans in the Human Diet. Compr Rev Food Sci Food Saf 2014; 14:37-47. [DOI: 10.1111/1541-4337.12119] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 08/27/2014] [Indexed: 12/16/2022]
Affiliation(s)
- Gertjan Schaafsma
- Advisory Services in Food; Health and Safety; Rembrandtlaan 12, 3925 VD Scherpenzeel The Netherlands
| | - Joanne L. Slavin
- Dept. of Food Science and Nutrition; Univ. of Minnesota; 1334 Eckles Avenue St. Paul MN 55108 U.S.A
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