The 3 Phases of a Low-FODMAP Diet, and Why Restriction Has an End

A food list with half the kitchen crossed out needs an end date.

1. A short restriction trial

With a clinician or dietitian, reduce high-FODMAP foods for a set period. The AGA¹ patient guide gives two to four weeks. FODMAPs include certain sugars and fibers. “Low-FODMAP” doesn’t mean eliminating all dairy or all gluten.¹

The NIDDK² describes this as one dietary option for IBS and recommends discussing dietary changes with a clinician or dietitian. Different changes help different people.²

2. Reintroduction

Add FODMAPs back under your dietitian’s plan to identify which ones you tolerate and which provoke symptoms. Keep a record of the foods and responses to discuss. The AGA¹ includes this phase as part of the trial, as a required step.¹

3. Personalization

Return to the widest diet you comfortably tolerate. A food’s presence on an elimination list doesn’t establish that it triggers your symptoms. If the trial doesn’t help, the AGA¹ advises returning to your usual diet.¹

Who needs a different plan

Tell your clinician about a past eating disorder or fear of eating. The AGA¹ says the three-phase process isn’t usually recommended in those circumstances. A dietitian can also consider a few targeted substitutions.¹

And don’t turn a symptom trial into a contest to eat fewer foods.

Records for the food conversation

Bloated by Dinner includes a Belly Clock log, Bristol scale card, one-change-at-a-time tracker and visit script. It adds ways to organize observations alongside the digestion coverage. It doesn’t replace a dietitian’s nutrition plan. See the book.