Chapter 1. Physiological and Metabolic Functions of the Intestinal Epithelium: From the Small to the Large Intestine -- Chapter 2. Intestine Offers Board and Lodging for Intestinal Microbes on a Short- or Long-Term Stay -- Chapter 3. Metabolism of Dietary Substrates by Intestinal Bacteria and Consequences for the Host Intestine -- Chapter 4. Alimentation, Bacterial Metabolites, and Host Intestinal Epithelium -- Chapter 5. Modification of the Bacterial Metabolites by the Host after Absorption, and Consequences for the Peripheral Tissues' Metabolism, Physiology, and Pathophysiology -- Chapter 6. Lessons to Be Learned from Clinical and Experimental Research on the Intestinal Microbiota Metabolic Activity for Health Benefit and Perspectives.