For many people starting the low FODMAP diet, bread is the hardest food to replace. Toast for breakfast, a sandwich for lunch, bread on the side at dinner: it turns up everywhere. You may not have to give it up: low FODMAP bread exists, and it helps to know what makes most bread a problem, and which options are gentler.
Why Regular Bread Can Trigger IBS Symptoms
Wheat, rye and barley are rich in fructans, a type of FODMAP. For many people with IBS, it's the fructans (not the gluten) that cause trouble. In a randomized, double-blind trial in people who believed they were sensitive to gluten, fructans triggered more symptoms than gluten did.1 That's why a slice of rye bread or standard wheat bread can leave you bloated even if you don't have celiac disease.
The amount matters. Fructans are a dose problem, so a small amount may be fine where a larger one is not. Low FODMAP ratings depend on portion.3
If you think bread is a problem, ask your doctor about a celiac blood test before cutting out wheat. The test needs gluten in your diet to be accurate, so it's best done before you start the low FODMAP diet.
Bread Types Compared
| Bread | FODMAP picture | Verdict during elimination |
|---|---|---|
| Standard white bread or whole wheat bread | Fructans | Limit to small portions or swap |
| Rye and pumpernickel | High in fructans | Avoid |
| Spelt | High in our data | Avoid, unless it's a true long-fermented spelt sourdough |
| Long-fermented sourdough | Fermentation can lower fructans | Test a small portion |
| Gluten-free (rice, corn, potato base) | Usually low, but check additives | Good starting point |
| Millet bread | Low | Good option |
| Bread with inulin, chickpea or coconut flour | Added FODMAPs | Avoid |
Sourdough: Does Fermentation Help?
Traditional sourdough is fermented for many hours, and that fermentation can break down fructans. Lab studies show that sourdough-related yeasts can degrade a large share of the fructans in wheat dough.2 But not all "sourdough" is made the same way. Many supermarket loaves are fermented only briefly or contain added yeast and flavorings.
How to spot a better sourdough:
- The ingredient list is short: flour, water, salt and starter
- No added commercial yeast, vinegar or "sourdough flavor"
- Bought from a bakery that can tell you how long the dough ferments
- White wheat or spelt flour rather than rye
Test a single slice on a day when you feel well, and note how you feel over the next day.
Gluten-Free Bread: Better, but Check the Label
Gluten-free breads avoid wheat, which removes wheat fructans, but "gluten-free" doesn't automatically mean low FODMAP. Watch for:
- Inulin or chicory root fiber, added to boost fiber (these are fructans)
- Legume flours such as chickpea flour or soy flour, which are high in GOS
- Coconut flour and amaranth flour, which are high in our data
- Honey, agave, apple or pear concentrate used as sweeteners
- Large serving sizes: gluten-free slices are often small, so it's easy to eat several
Breads based on rice, corn, potato, millet, buckwheat or teff are usually the safest starting point. Food processing can change FODMAP content, so the same ingredient may rate differently in different products.4
Gluten-free bread is often better toasted. It tends to be drier and more crumbly than wheat bread when fresh.
Other Bakery Items
- Croissants, muffins and crumpets are high in our data
- Naan and roti are moderate, so a small piece is the limit
- Corn tortillas are a good swap for wheat wraps (check for added onion or garlic)
- Oatcakes and rice crackers work well with cheese or toppings
Easy Bread Alternatives
- Rice cakes or plain rice crackers with peanut butter or cheese
- Toasted potato slices or hash browns under eggs
- Oat porridge or oatcakes in moderate portions
- Lettuce cups instead of burger buns
- Polenta slices, grilled or pan-fried
Bread After the Elimination Phase
Wheat is one of the foods tested during reintroduction, usually as part of the fructan challenge. Many people find they can eat a little regular bread without symptoms, even if a full sandwich is too much. Knowing your amount makes it much easier to eat at friends' houses and in restaurants.
Not sure about a particular loaf? Scan it with the Stummy app or look up individual ingredients in our FODMAP checker. And if you're weighing up a gluten-free diet, read low FODMAP vs gluten-free first.
