Diet Microbe Interactions In The Gut

Drawing on expert opinions from the fields of nutrition, gut microbiology, mammalian physiology, and immunology, Diet-Microbe Interactions for Human Health investigates the evidence for a unified disease mechanism working through the gut and its resident microbiota, and linking many inflammation-related chronic diet associated diseases. State of the art post-genomic studies can highlight the important role played by our resident intestinal microbiota in determining human health and disease. Many chronic human diseases associated with modern lifestyles and diets — including those localized to the intestinal tract like inflammatory bowel disease and celiac disease, and more pervasive systemic conditions such as obesity, diabetes and cardiovascular disease — are characterized by aberrant profiles of gut bacteria or their metabolites. Many of these diseases have an inflammatory basis, often presenting with a chronic low-grade systemic inflammation, hinting at persistent and inappropriate activation of inflammatory pathways. Through the presentation and analysis of recent nutrition studies, this book discusses the possible mechanisms underpinning the disease processes associated with these pathologies, with high fat diets appearing to predispose to disease, and biologically active plant components, mainly fiber and polyphenols, appearing to reduce the risk of chronic disease development. One comprehensive, translational source for all aspects of nutrition and diet's effect on gastrointestinal health and disease Experts in nutrition, diet, microbiology and immunology take readers from the bench research (cellular and biochemical mechanisms of vitamins and nutrients) to new preventive and therapeutic approaches Clear presentations by leading researchers of the cellular mechanisms underlying diet, immune response, and gastrointestinal disease help practicing nutritionists and clinicians (gastroenterologists, endocrinologists) map out new areas for clinical research and structuring clinical recommendations

Introduction: The gut microbiome has attracted much attention in the last decade due to new studies and technologies revealing how gut microbes play a key role in human health and disease risk. However, we still know little about how diets, foods and nutrients shape the gut microbiome.Materials and Methods:To expand our knowledge about the complex relationship between nutrient intake and intestinal bacteria, we performed a broad dietary study covering diverse foods and nutrient intakes of nearly 100 adults. We analyzed metataxonomic data from 16S rRNA sequencing and correlated the microbial abundances of the top 55 dominant taxonomic groups with collected intakes of 40 food groups and 44 nutritional parameters, as well as degree of adherence to healthy eating patterns. Based on Spearman correlation profiles and hierarchical clustering, we also identified food groups and nutritional parameters that modulate in a similar manner microbial community structure.Results: We will present preliminary results showing direct effects of specific dietary patterns (e.g. adherence to the Mediterranean style diet), food groups (e.g., fruits, nuts, dairy) and nutrients (e.g. iron, magnesium, zinc) on specific genera of the gut microbiota. We found significant associations between alcohol and the bacterial genus Holdemania. We will show that food groups supposed to belong to the same higher-level food category do not always show the expected effect on the gut microbes, which supports the need for a detailed food classification scheme to investigate dietary effects. Similarly, we found that correlations at dietary and higher food group levels more consistently reflect existing diet:microbe associations from the literature while correlations at the nutrient level are prone to confounding factors only apparent at higher alimentary ontology.Discussion: Our study aims at a more complete understanding of the complex relations between human diet and gut microbiome community structure. Initial results confirm that both the quantity of a nutrient and the dietary source of a nutrient can both influence associations with gut bacteria. Our results may help to define new strategies for modelling diet:microbe interactions in the gut providing a new valuable tool to assist the nutrition and gut microbiome communities.Conflict of interest:There is no conflict of interest.

In consultation with Consulting Editor, Dr. Alan Buchman, Dr. Rocheyllys Diaz Heijtz has put together a state-of the-art issue of the Gastroenterology Clinics of North America devoted to The Microbiome: Interactions with Organ Systems, Diet, and Genetics. Clinical review articles from expert authors are specifically devoted to the following: The Role of the Microbiome of o the Female Reproductive Tract on Health and Pregnancy; Eating Disorders and the Gut Microbiota; Maturation of the Infant Microbiome Community Structure and Function; Microbe-Host Interactions in Allergic Diseases; Emerging Role of the Gut Microbiota in Neurodevelopmental Disorders; Brain-Gut-Microbiota Axis and Mood Disorders; Brain-Gut-Microbiota and ADHD; The Microbiota-Gut-Brain Axis and Postpartum Depression; and The Microbiota and Pancreatic Cancer. Readers will come away with the latest information on the microbiome and how to incorporate the information into gut health for patients.

This accessibly written, comprehensive summary of research findings on the gut microbiome and its implications for health and disease—a topic of growing interest and concern—serves as an essential resource for teachers and students. Most people know that the digestive tract contains billions of helpful gut bacteria, but how does the gut microbiome affect our health? What exactly do these bacteria do, and what are the negative effects when these microorganisms are harmed by what we eat and do? What impacts might they have on conditions such as irritable bowel syndrome (IBS), obesity, and autism? This book provides an accessible, holistic introduction to the study of the human gut microbiome and its effects on digestion and disease—one of the newest and most rapidly expanding fields in medicine today. The gut microbiome is known as "the forgotten organ" because it is not identified as part of the human body per se, yet it has an immense influence on many systems in the body. The Gut Microbiome: Exploring the Connection between Microbes, Diet, and Health explains what the microbiome is, the many functions it serves, how it can be either harmed or supported by our actions, and the role it may play in various diseases and in determining our overall health. The book examines the various potential causes of imbalance in the microbiome, such as diet and other lifestyle factors, and then identifies strategies for improving human health by protecting the gut microbiota. The science-based information is detailed but accessible to general readers or students without extensive background knowledge.

All parts of our body having communication with the external environment such as the skin, vagina, the respiratory tract or the gastrointestinal tract are colonized by a specific microbial community. The colon is by far the most densely populated organ in the human body. The pool of microbes inhabiting our body is known as “microbiota” and their collective genomes as “microbiome”. These microbial ecosystems regulate important functions of the host, and their functionality and the balance among the diverse microbial populations is essential for the maintenance of a “healthy status”. The impressive development in recent years of next generation sequencing (NGS) methods have made possible to determine the gut microbiome composition. This, together with the application of other high throughput omic techniques and the use of gnotobiotic animals has greatly improved our knowledge of the microbiota acting as a whole. In spite of this, most members of the human microbiota are largely unknown and remain still uncultured. The final functionality of the microbiota is depending not only on nutrient availability and environmental conditions, but also on the interrelationships that the microorganisms inhabiting the same ecological niche are able to establish with their partners, or with their potential competitors. Therefore, in such a competitive environment microorganisms have had to develop strategies allowing them to cope, adapt, or cooperate with their neighbors, which may imply notable changes at metabolic, physiological and genetic level. The main aim of this Research Topic was to contribute to better understanding complex interactions among microorganisms residing in human microbial habitats.

The Food Forum convened a public workshop on February 22-23, 2012, to explore current and emerging knowledge of the human microbiome, its role in human health, its interaction with the diet, and the translation of new research findings into tools and products that improve the nutritional quality of the food supply. The Human Microbiome, Diet, and Health: Workshop Summary summarizes the presentations and discussions that took place during the workshop. Over the two day workshop, several themes covered included: The microbiome is integral to human physiology, health, and disease. The microbiome is arguably the most intimate connection that humans have with their external environment, mostly through diet. Given the emerging nature of research on the microbiome, some important methodology issues might still have to be resolved with respect to undersampling and a lack of causal and mechanistic studies. Dietary interventions intended to have an impact on host biology via their impact on the microbiome are being developed, and the market for these products is seeing tremendous success. However, the current regulatory framework poses challenges to industry interest and investment.