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The Low-FODMAP Diet for IBS

If you have irritable bowel syndrome, certain carbohydrates called FODMAPs can trigger gas, bloating, and pain. The low-FODMAP diet is a structured, temporary tool to find your personal triggers, not a permanent way of eating.

Irritable bowel syndrome, or IBS, is common and frustrating. One of the most effective dietary approaches we use is the low-FODMAP diet. FODMAP is a shorthand for a group of carbohydrates that are poorly absorbed in the gut and can cause bloating, gas, cramping, and changes in bowel habits in sensitive people.

This Diet Has Three Phases

This is the part many people miss. The low-FODMAP diet is not meant to be followed strictly forever. It is a three-step process, and ideally it is done with guidance from us or a dietitian.

Phase 1: Elimination

For about two to six weeks, you remove high-FODMAP foods to let symptoms settle. This phase is restrictive, which is exactly why it is short.

Phase 2: Reintroduction

You add foods back one group at a time to learn which ones trigger your symptoms and how much you can tolerate. This is the most important phase.

Phase 3: Personalization

You settle into a long-term way of eating that avoids only your personal triggers, keeping your diet as varied as possible.

Common High and Low FODMAP Foods

Generally Lower FODMAP

  • Rice, oats, potatoes
  • Carrots, spinach, zucchini, bell peppers
  • Bananas, oranges, grapes, strawberries
  • Eggs, chicken, fish, firm tofu
  • Lactose-free dairy, hard cheeses

Common Triggers (Higher FODMAP)

  • Onion and garlic
  • Wheat-based bread and pasta in large amounts
  • Beans and lentils in large amounts
  • Apples, pears, mango, watermelon
  • Milk, soft cheeses, and many sugar-free sweeteners

Why Guidance Matters

Because the elimination phase is restrictive, doing it alone for too long can lead to an unnecessarily limited diet and missed nutrients. The goal is always to get back to eating as wide a range of foods as your body comfortably allows.

Before you start

Talk with us first. Some symptoms that look like IBS can be other conditions, and we want to make sure nothing more serious is being missed before you change your diet.

When to seek urgent care

FODMAPs are about comfort, not emergencies. But you should be seen promptly for blood in your stool, unintentional weight loss, fever with belly pain, or severe or persistent abdominal pain. These are not typical IBS and need evaluation.

Have questions about this?

Bring this guide to your next visit. We are always glad to talk through what it means for your specific situation and care plan.

Medically reviewed by Dr. Vineeth Lekkala, MD. Last reviewed Jun 14, 2026.

This guide is for general education only and is not medical advice. It does not replace a conversation with your own doctor, and it should not be used to diagnose or treat any condition. Always talk with your physician before making changes to your diet, medications, or care. If you think you may have a medical emergency, call 911 or go to the nearest emergency room.