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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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Mucus in Stool

Mucus in Stool Causes: Gut Health Issues and When to Seek Help

Is Mucus in Your Bowel Movement Normal? Understanding Causes and When to Seek Help A small amount of mucus in stool is normal and often goes unnoticed. Mucus, produced by... Read More
  • May 16, 2025
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Nicotinamide COVID-19 recovery

Nicotinamide Boosts COVID-19 Recovery via Gut Microbiome

Nicotinamide: A Gut-Microbiome-Mediated Strategy for Accelerating COVID-19 Recovery The COVID-19 pandemic, caused by SARS-CoV-2, has highlighted the need for effective therapies to address its metabolic and immune disruptions. A recent... Read More
  • May 15, 2025
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Gut health problems

Gut Health Problems: Why They’re Rising and How to Fix Them

Why Are Gut Health Problems on the Rise? Gut health issues have grown over the past 10 years, affecting millions of people. From mild discomfort to serious diseases, gastrointestinal (GI)... Read More
  • May 13, 2025
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IMO vs SIBO

IMO vs SIBO: Understanding Gut Health Issues and Treatments

If you’re dealing with bloating, constipation, or diarrhea, you might have heard of IMO (intestinal methanogen overgrowth) or SIBO (small intestinal bacterial overgrowth). Gut health issues like SIBO and IMO... Read More
  • May 12, 2025
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Microbiome-Light-Time-Quantum Theory

Microbiome-Light-Time-Quantum Theory

Microbiome-Light-Time-Quantum Theory Imagine life as a system where light, time, and gut microbes interact, guided by the principles of quantum mechanics. This is my Microbiome-Light-Time-Quantum Theory, which sees every living... Read More
  • April 30, 2025
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Gut-Mitochondria-Brain Axis

The Gut-Mitochondria-Brain Axis

I propose that the gut-brain and gut-mitochondria axes are not isolated systems but part of a deeply interconnected network, linked at the molecular level by microtubules, chemical messengers, and bioelectrical... Read More
  • April 26, 2025
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Indigo Novel UC Therapy

Indigo as a Novel UC Therapy: A Gut Health Breakthrough

Ulcerative colitis (UC), a chronic inflammatory bowel disease (IBD), affects millions, causing symptoms like abdominal pain and diarrhea. Current treatments, such as steroids and immunosuppressants, often face challenges like low... Read More
  • April 22, 2025
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Carbohydrate Maldigestion

Carbohydrate Maldigestion: Causes, Symptoms, and Solutions

Introduction: Could Carbohydrate Maldigestion Be Causing Your Gut Issues? If you’ve ever felt bloated, gassy, or had diarrhea after eating certain foods, you might be dealing with carbohydrate maldigestion. This... Read More
  • April 21, 2025
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