Food is the trigger people with IBS mention most often. But "IBS foods to avoid" lists can be confusing, because triggers vary from person to person. This guide covers the most common culprits, simple swaps and how to find your triggers.
What are FODMAPs?
FODMAPs are short-chain carbohydrates that some people don't absorb well. In the large intestine, gut bacteria ferment them, producing gas and drawing in water. For a sensitive IBS gut, this can mean bloating, pain, diarrhea or constipation. The low-FODMAP approach was developed and tested at Monash University and is recommended in many IBS guidelines.
Common high-FODMAP trigger foods
- Vegetables: onion, garlic, cauliflower, mushrooms, asparagus
- Fruit: apples, pears, mango, watermelon, cherries, dried fruit
- Grains: wheat, rye and barley in large amounts (bread, pasta, crackers)
- Legumes: beans, lentils, chickpeas
- Dairy: milk, soft cheese and yogurt (lactose)
- Sweeteners: honey, high-fructose corn syrup, sorbitol, mannitol, xylitol
Other common IBS triggers
- Large, fatty or fried meals
- Spicy food
- Caffeine (especially on an empty stomach)
- Alcohol
- Fizzy drinks
Gut-friendly swaps
- Onion and garlic → garlic-infused oil, chives, the green part of spring onions
- Wheat bread → sourdough spelt or gluten-free bread
- Cow's milk → lactose-free milk or almond milk
- Apples and pears → oranges, kiwi, strawberries, grapes, unripe bananas
- Cauliflower and mushrooms → carrots, zucchini, spinach, bell peppers
- Honey → maple syrup in small amounts
How to find your personal triggers
- Elimination (2–6 weeks): reduce high-FODMAP foods
- Reintroduction: add back one FODMAP group at a time and note your reaction
- Personalisation: keep eating everything you tolerate, and limit only your real triggers
Working with a dietitian makes this much easier, and it avoids cutting out foods unnecessarily, which can harm your gut bacteria long-term.
Food is only half the picture
Many people notice that the same meal causes symptoms on a stressful day but not on a calm one. That's the gut–brain axis at work. Combining smart food choices with stress management and comfort tools like warmth often works better than diet alone. See our flare-up survival guide for more.
This article is for general information only and is not medical advice. Please speak to your doctor or a registered dietitian before making major diet changes.
