IBS: The Fiber-Diversity and Low-FODMAP Framework
Megan Rossi, PhD, RD ("The Gut Health Doctor," King's College London) frames IBS management in two phases: a short-term, structured low-FODMAP elimination phase, ideally dietitian-supervised, followed by a long-term goal of eating 30-plus different plant foods a week for fiber diversity. Low-FODMAP is not meant to be a permanent diet. Disclosed: Dr. Rossi founded Bio&Me, a gut-health food and supplement brand; this is a direct commercial interest in the space she writes about, and nothing on this page requires buying it.
Get IBS diagnosed by a clinician before starting an elimination diet, ruling out red-flag symptoms n/a, one clinical visit
IBS is a diagnosis of exclusion; other conditions need to be ruled out first, the same starting point this site's existing Bulsiewicz IBS protocol uses.
Eliminate high-FODMAP foods for a short, defined period, ideally with a dietitian Short-term, structured, dietitian-supervised where possible; not indefinite
Low-FODMAP has the strongest RCT support for short-term IBS symptom relief of any dietary approach.
Reintroduce FODMAP groups one at a time to identify your personal triggers Structured reintroduction phase, ideally dietitian-guided
Reintroduction is what turns a diagnostic elimination diet into a sustainable, personalized long-term diet rather than an indefinite restriction.
Work toward eating 30-plus different plant foods a week as your long-term goal, once your personal triggers are identified Ongoing, long-term goal, not a one-time target
This is Rossi's extrapolation from microbiome-diversity research linking a wider variety of plant fiber sources to a more diverse gut microbiome; presented as a reasonable, not a definitively proven, target.
Low-FODMAP has real randomized-controlled-trial support for short-term IBS symptom control.
View sources
Sigma Nutrition, Episode 450
Dr. Megan Rossi, PhD, RD
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 Megan Rossi, PhD, RD and is not created, reviewed, endorsed by, or affiliated with Megan Rossi, PhD, RD or King's College London, Department of Nutritional Sciences.
Is this for you
- Anyone with diagnosed IBS currently stuck on long-term low-FODMAP without a reintroduction plan
- People who want the fiber-diversity long-term goal, not just the elimination phase
Cautions
- Only a clinician can diagnose IBS; rule out red-flag symptoms first
- Low-FODMAP is not meant to be permanent; indefinite restriction risks narrowing diet diversity
- Disclosed: Dr. Rossi founded Bio&Me, a gut-health food and supplement brand; nothing here requires buying it
- Informational only, ideally alongside a dietitian for the elimination phase
Some links earn us a commission. It never affects our picks or grades. See our affiliate disclosure.