The Digestive System, Microbiome, and Enteric Health

How the Body Breaks Down, Absorbs, and Lives With Its Food

The Digestive System, Microbiome, and Enteric Health is Book A4 of The Performance & Human Physiology Encyclopedia — a 93-volume, university-level library on how the human body actually works, system by system. It is written for students, coaches, clinicians and serious self-learners: deep enough that a professional already trained in the field keeps learning, structured clearly enough that a motivated reader can follow every step.

What you will find inside

• The Digestive System: Organization and the Logic of Digestion
• The Mouth, Pharynx, and Esophagus: Ingestion and the First Steps
• The Stomach: Reservoir, Acid, and Chemical Attack
• The Small Intestine: The Main Site of Digestion and Absorption
• The Accessory Organs: Pancreas, Liver, and Gallbladder
• Carbohydrate Digestion and Absorption
• Protein Digestion and Absorption
• Lipid Digestion and Absorption
• Water, Electrolytes, Micronutrients, and the Large Intestine
• The Gut Microbiome
• The Gut as a Barrier and Immune Organ
• The Gut–Brain Axis and the Regulation of Appetite
• Digestive Health in Practice: Eating, Performance, and Gut Well-Being

How this book is written

• University level, without dilution. Exact scientific terminology, defined at first use — mechanisms, not just conclusions.
• Evidence graded, not asserted. Major claims carry a level, from A (strong) to D (expert opinion), so you always know how much weight to give them.
• Numbers, formulas, worked examples. Reference ranges, equations and solved calculations you can apply the same day.
• Myths confronted directly. Where a popular claim does not survive the evidence, the book says so — and shows why.
• Fully referenced (APA 7). References at the end of every chapter, plus a master bibliography.

13 chapters · approx. 246 pages · Book A4, Collection A — Physiological & Biological Foundations.