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From the Townsend Letter
February / March 2013

Small Intestine Bacterial Overgrowth:
Often-Ignored Cause of Irritable Bowel Syndrome

by Allison Siebecker, ND, MSOM, LAc, and
Steven Sandberg-Lewis, ND, DHANP

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Allison Siebecker, ND, MSOM, LAc
Steven Sandberg-Lewis, ND, DHANP
NCNM Clinic
3025 SW Corbett Ave.
Portland, Oregon 97211

Allison SiebeckerAllison Siebecker, ND, MSOM, LAc, is a graduate of NCNM, where she specializes in treating SIBO in her private practice. She is the author of an educational website on SIBO, is currently writing a book on SIBO, and teaches continuing education to physicians on SIBO and related topics. In 2005, Dr. Siebecker received the Best in Naturopathy award from the Townsend Letter for her article "Traditional Bone Broth in Modern Health and Disease." Visit her educational website at

Steven Sandberg-Lewis
Steven Sandberg-Lewis, ND, DHANP, is a graduate of NCNM, where he practices, supervises student shifts, and has been professor of gastroenterology since 1996. In 2009, Dr Sandberg-Lewis received the Best in Naturopathy award from the Townsend Letter for his article "Hiatal Hernia Syndrome" and honorable mention in 2011 for his article "Proton Pump Inhibitors – A Risky Experiment?" His textbook, Functional Gastroenterology, is available at

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