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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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Gut Microbiome Metabolites: Who Really Makes Them?

Gut Microbiome Metabolites: Who Really Makes Them? When a blood, urine, or stool test finds a compound linked to the gut microbiome, it is tempting to assume that gut bacteria... Read More
  • September 28, 2026
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How Gut Transit Time Changes Your Microbiome

How Gut Transit Time Changes Your Microbiome If you have IBS, SIBO, constipation, diarrhea, bloating, or abnormal stool-test results, it is easy to assume the bacteria on the test are... Read More
  • September 18, 2026
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Intermittent Fasting, Gut Health and Chronic Pain

How Intermittent Fasting Changed the Gut-Brain Pain Pathway Table of Contents What Did the Researchers Actually Find? A Gut Bacterium Reproduced Part of the Effect Hippuric Acid Became the Metabolic... Read More
  • August 27, 2026
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Gut Bacteria and IBS Pain: Could Histamine Be the Missing Link?

Firstly, you eat a meal that should not cause a problem. However, for many people, the relationship between gut bacteria and IBS pain can mean unexpected discomfort after eating. Soon... Read More
  • July 17, 2026
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Why CIRS Patients Don’t Fully Recover | The Real Reason

Why CIRS Patients Don’t Fully Recover Many people with CIRS do a lot of the right things. They eat better, reduce stress, avoid mold, and take supplements. Yet they still... Read More
  • April 20, 2026
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Gut–Brain Axis Dysfunction: Why Digestive Symptoms Are Not Just About Digestion

Table of Contents A Common Misconception About Digestive Health What the Study Investigated Biological Mechanisms Explained in Plain English Clinical Interpretation Systems Biology Integration Why This Matters for Long-Term Health... Read More
  • February 22, 2026
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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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