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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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Increase GLP-1 with Tryptophan and Tryptophan-Rich Foods

Learn how to increase GLP-1 naturally with tryptophan and tryptophan-rich foods. GLP-1 (glucagon-like peptide-1) is a hormone your gut releases after you eat. It helps control blood sugar, reduces appetite,... Read More
  • August 15, 2025
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Sunlight-Gut-Brain Connection and Redox Biology

The Sunlight-Gut-Brain Axis: How Light, Nitric Oxide, and Redox Biology Govern Human Health Modern life hides us from the sun—and our biology is paying the price. Most people know sunlight... Read More
  • August 5, 2025
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Gut Bacteria Detox Pesticides and PFAS Through High Fiber Diet

Introduction: Why Gut Bacteria Matter for Detoxification Chemical pollutants such as pesticides and per- and polyfluoroalkyl substances (PFAS) are everywhere. They can be found in food, water, and household products.... Read More
  • July 19, 2025
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Bowel Movement Frequency Affects Microbiome and Organ Health

How Bowel Movement Frequency Affects Your Gut Microbiome and Organ Health Your bowel movements might seem like a mundane part of life, but they’re secretly telling a story about your... Read More
  • July 8, 2025
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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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