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From the Townsend Letter
February/March 2015

SIBO: Dysbiosis Has A New Name
by Steven Sandberg-Lewis, ND, DHANP and Allison Siebecker, ND, MSOM

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Sandberg-LewisDr. Steven Sandberg-Lewis is a practitioner of naturopathic gastroenterology. He has been in practice for 36 years, the first 18 years in private practice. In 1996 he joined the full-time faculty of the National College of Natural Medicine (NCNM) in Portland, Oregon. He engages in patient care four days per week and is a professor of gastroenterology. He is a frequent presenter at educational seminars around the US and Canada.

In 2013 he was listed among "Top Docs" in Portland Magazine. His articles on hiatal hernia and SIBO won first prize in the Townsend Letter's Best of Naturopathic Medicine in 2009 and 2013. His piece on proton pump inhibitors was an honorable mention in 2011.

As cofounder of the SIBO Center for Digestive Health at NCNM, Dr. Sandberg-Lewis often treats patients whose health conditions have defied diagnosis despite exhaustive medical testing. Restoring ideal digestive function and normalizing the gut microflora have earned the center a reputation for success in helping many who previously suffered digestive diseases without hope of cure.

Sandberg-Lewis is the author of the textbook Functional Gastroenterology: Assessing and Addressing the Causes of Functional GI Disorders (NCNM Press; 2009). He and his wife and son have also written a comic book explanation of SIBO for patients. The textbook and comic are both available at

SiebeckerAllison Siebecker, ND, MSOM, LAc, is a graduate of the National College of Natural Medicine. Dr Siebecker is the cofounder and medical director of the SIBO Center for Digestive Health at NCNM Clinic in Portland, Oregon, where she specializes in the treatment of SIBO. She is instructor of advanced gastroenterology at NCNM, is the author of the educational website, and is writing a book synthesizing the SIBO data into one source. In 2005 and 2013, she received the Best in Naturopathy award from the Townsend Letter for her articles "Traditional Bone Broth in Modern Health and Disease"(2005) and "Small Intestine Bacterial Overgrowth: Often Overlooked Cause of IBS" (2013).

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