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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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Bifidobacterium Deficit in U.S. Infants and Rising Sickness

A Bifidobacterium Deficit in U.S. Infants is Causing an Alarming Rise in Allergies and Non-Communicable Diseases (NCD) The gut microbiome shapes a baby’s health for life. Yet, a groundbreaking study... Read More
  • June 26, 2025
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CIRS: Expert Insights on Understanding Chronic Inflammation

Understanding Chronic Inflammatory Response Syndrome (CIRS): Expert Insights Chronic Inflammatory Response Syndrome (CIRS) is a complex, multi-system condition triggered by exposure to biotoxins, such as those from mold illness, Lyme... Read More
  • June 22, 2025
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Walnuts Boost Gut Health, Digestion, and Energy

The Gut-Health Benefits of Walnuts: A Game Changer for Your Body Walnuts boost gut health. A new study shows that eating walnuts can improve your gut bacteria, make your body... Read More
  • June 4, 2025
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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 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: 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: 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 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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