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 February 2026.