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Welcome to the blog of “The Digestion Coach,” Dr. Marcus Ettinger.

As a practicing doctor of 36+ years and GI health specialist, I have studied, written, and treated the human body for a long time. I created this blog to provide easy-to-understand information on complex topics and to help anchor everything I study. I hope the information on my blog increases your understanding of the body, disease, and health.

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Biology of Aging: Insights from Modern Research

Table of Contents Aging Is Not Just About Getting Older What Researchers Wanted to Understand The Biology of Aging — Explained Simply From a Clinical Perspective… Aging Is a Whole-Body... Read More
  • February 17, 2026
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KPV Peptide GI–Neuro Protocol

The KPV Peptide GI–Neuro Protocol offers a unique method for addressing gut, immune, and neurological imbalances.  If you struggle with chronic digestive issues, inflammation, pain, fatigue, anxiety, or brain fog—and... Read More
  • February 10, 2026
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Vitamin B1 for Gut Motility: IBS Constipation and SIBO Relief

Vitamin B1 for gut motility may be an often-overlooked area of opportunity. If you have IBS or SIBO, you may feel stuck after meals. You may bloat fast. You may... Read More
  • January 24, 2026
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Chiropractic Care for IBS and SIBO: Relief for Bloating & Motility

If you have IBS or SIBO, you are not alone. Bloating, gas, abdominal pain, constipation, and diarrhea can disrupt daily life. Quick Answer: Chiropractic care for IBS and SIBO may... Read More
  • January 21, 2026
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Thiamine Deficiency, SIBO, and Dysautonomia

Thiamine Deficiency, SIBO, and Dysautonomia – A Patient-Friendly Guide Table of Contents Cause, consequence—or both? Hydrogen sulfide, mitochondria, and low energy Key takeaway points What thiamine does in the body The... Read More
  • January 4, 2026
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Visceral Hypersensitivity in SIBO: Support Guide

Supporting Visceral Hypersensitivity in SIBO Patients Who React to Low-FODMAP Foods Visceral hypersensitivity (VH) happens when gut nerves overreact to normal stretching or food, causing pain and bloating from signals... Read More
  • November 9, 2025
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Cysteine Enhances Intestinal Stemness

Want to enhance gut repair with diet? A new Nature study (2025) shows dietary cysteine enhances intestinal stemness *. Cysteine from animal protein or nutritional supplementation triggers CD8+ T cells... Read More
  • October 19, 2025
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SIBO-Related Anxiety: Top Stress Management Techniques

SIBO-related anxiety affects many patients with Small Intestinal Bacterial Overgrowth (SIBO), a digestive disorder causing bloating, gas, and pain. Anxiety can worsen these symptoms, creating a cycle that impacts daily... Read More
  • September 28, 2025
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