The Low-FODMAP Diet: A Beginner’s Guide for IBS

The low-FODMAP diet is one of the most evidence-based dietary approaches for managing IBS symptoms. Developed by researchers at Monash University, it has been shown to reduce symptoms in approximately 75% of IBS patients. FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols - short-chain carbohydrates that are poorly absorbed in the small intestine and can trigger gas, bloating, and other IBS symptoms. High-FODMAP foods include onions, garlic, wheat, certain fruits (apples, pears, watermelon), dairy products containing lactose, legumes, and artificial sweeteners (sorbitol, mannitol). Low-FODMAP alternatives include rice, oats, and quinoa; lactose-free dairy or hard cheeses; berries, oranges, and grapes; carrots, zucchini, and spinach; and maple syrup (instead of honey). The diet follows three phases: elimination (2 to 6 weeks of strict low-FODMAP eating), reintroduction (systematically testing each FODMAP group to identify personal triggers), and personalization (a long-term diet that avoids only your specific trigger foods). This diet is not meant to be followed strictly long-term. Working with a registered dietitian is strongly recommended to ensure nutritional adequacy and proper reintroduction. The Monash University FODMAP app is a reliable resource for food listings. This article is for informational purposes only.

This article is for informational purposes only and does not constitute medical advice. Content reviewed by licensed Canadian physicians. Last updated August 2026.