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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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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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Fenugreek for Gut Health & Weight Loss

How Does Fenugreek Work with the Gut and Microbiome? Fenugreek microbiome interactions drive its benefits for gut health, glucose control, and weight loss. People often search, “How does fenugreek work... Read More
  • September 14, 2025
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Gut Bacteria Support Weight Loss

Gut Bacteria Support Weight Loss: Top Prebiotic Foods to Boost Your Microbiome Table of Contents What Gut Bacteria Promote Weight Loss? How Do These Bacteria Support Weight Loss? What Foods... Read More
  • September 13, 2025
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Microbial Metabolite for Liver Repair: Supporting Gut-Liver Axis

Microbial Metabolite via Gut-Liver Axis Repairs Damaged Liver 10-hydroxystearic acid (10-HSA), a microbial metabolite for liver repair key player in the gut-liver axis. The gut-liver axis is a vital pathway... Read More
  • August 30, 2025
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Queuosine: The Gut and Food Compound Your Body Needs

Table of Contents What Is Queuosine and Why Does It Matter? Which Gut Bacteria Produce Queuosine? What Substrates Do Bacteria Need to Make Queuosine? What Foods Contain Queuosine or Support... Read More
  • August 24, 2025
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