SIBO: The Low-Fermentation Diet (What To Eat During and After Treatment)
Mark Pimentel, MD, Executive Director of the Cedars-Sinai MAST Program and developer of the first non-invasive SIBO breath test, is explicit that antibiotics (rifaximin, sometimes with neomycin or metronidazole), not diet, are the primary SIBO treatment, physician-prescribed only, and he specifically advises against restricting carbs during that antibiotic course. His low-fermentation diet's actual role is extending remission afterward: more liberal than low-FODMAP, so it does not further reduce microbiome diversity. Informational only, alongside your physician's care.
The primary SIBO treatment is a physician-prescribed antibiotic course (commonly rifaximin, sometimes with neomycin or metronidazole for methane-predominant SIBO) n/a, physician-prescribed and monitored
Diet does not eradicate SIBO; it manages symptoms and supports remission around the actual treatment.
Eat normally, without cutting carbohydrates, for the duration of your antibiotic course n/a
Pimentel specifically advises against carb restriction during treatment; the antibiotic works on metabolically active bacteria, and starving them first can undercut the treatment.
Once antibiotic treatment ends, shift to a low-fermentation diet: more liberal than low-FODMAP, limiting the most fermentable foods without eliminating broad food categories Ongoing, individualized with a dietitian if possible
This reduces fermentable substrate for bacterial regrowth while preserving more microbiome diversity than a strict low-FODMAP approach followed long-term.
Some patients use ginger for nausea and gut-motility support alongside the remission diet Per label
Ginger's prokinetic effect is real but modest in the evidence base; it is a commonly-tried adjunct, not a substitute for the antibiotic treatment path.
Pimentel specifically advises against restricting carbohydrates during antibiotic treatment, because the bacteria targeted by rifaximin need to be metabolically active for the antibiotic to work well.
View sources
A New Understanding of SIBO and IBS with Mark Pimentel
Dr. Mark Pimentel on Fiber, the Low-FODMAP Diet, and What to Eat During SIBO Treatment
Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol is an independent platform. This protocol is based on the publicly available work of Mark Pimentel, MD and is not created, reviewed, endorsed by, or affiliated with Mark Pimentel, MD or Cedars-Sinai MAST Program.
Is this for you
- People diagnosed with SIBO via breath testing, in or after antibiotic treatment
- Anyone told to 'just do low-FODMAP forever' who wants the remission-specific, more liberal alternative
- Readers with IBS symptoms exploring whether SIBO testing is worth asking a physician about
Cautions
- Informational only, alongside your physician's care
- Antibiotics are the primary SIBO treatment; diet does not replace them
- Do not restrict carbohydrates during antibiotic treatment
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