Digestion Coach

Nearly Four Decades In Practice

No Case Too Complicated

Free 15-Minute Consultation

Call Today 714-639-4360

Dr. Marcus Ettinger

Welcome to The Digestion Coach ™

I’m Dr. Marcus Ettinger, The Digestion Coach ™, your go-to SIBO specialist, resource, and clinician for all conditions that relate to digestive function. Here, you’ll find straightforward information about the digestive system, related conditions, and how to book a consultation. This site also serves as an additional resource to enhance the care and support I provide my patients at my office or worldwide via telemedicine.

630 S. Glassell St. #103. Orange, CA 92866

Abdominal Pain, SIBO, H. pylori, IBS/IBD, Constipation, Diarrhea, GERD, Gastritis, Abdominal Bloating, Food Intolerance, etc, and all related issues associated with these conditions.

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EXPERIENCED DOCTOR

Dr. Marcus Ettinger, BSc., DC. “The Digestion Coach ™.”

37 years as an IBS, IBD, H. pylori, and SIBO specialist.

COMPREHENSIVE TESTING

The correct diagnostic tests can help determine the exact cause of the problem and assist in the best plan of action.

NUTRACEUTICAL SUPPORT

You’re only as good as the tools you have to work with. I have just about all of them.

PROVEN PROTOCOLS

37 years and 1000s of successfully treated patients helped build the proven protocols used.

DIGESTION COACH ARTICLES

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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...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...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,...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...Read More
February 22, 2026
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