Foods to avoid for SIBO are mostly high-FODMAP foods: fermentable carbohydrates such as onions, garlic, wheat, beans, certain fruits, lactose and sugar alcohols that can feed gas-producing bacteria and make bloating worse. The catch is that diet is only one piece of SIBO care, and the evidence is thinner than most online lists suggest.
The Cleveland Clinic says plainly that there is no official SIBO diet. Providers may recommend a low-FODMAP or elemental diet, alongside treatment such as antibiotics, and diet is not presented as a standalone cure. It also advises limiting high-FODMAP foods for an elimination phase of about three to four weeks, then reintroducing groups one at a time, and says long-term low-FODMAP use is not recommended. At least 50% of people may have SIBO come back, so follow-up with your doctor matters.
Jump to: Onions and Garlic | Wheat and Rye | Beans and Lentils | Milk, Ice Cream and Soft Cheeses | Apples, Pears and Cherries | Cauliflower and Mushrooms | Honey | Sugar-Free Gum, Candy and “Diet” Products | Cashews and Pistachios | Staying on a Strict Diet for Too Long | Quick reference | How to Use This List | FAQ | The Bottom Line
10 Foods and Habits to Limit for SIBO
The Cleveland Clinic’s list of high-FODMAP foods to avoid during the elimination phase covers fruits, vegetables, dairy, legumes, grains, nuts and sweeteners. The items below follow that list, plus one important habit.
1. Onions and Garlic
Onions are on the Cleveland Clinic’s list of high-FODMAP vegetables to avoid. They are in so many sauces, soups and seasoning blends that hidden onion and garlic powder is a common reason people keep having symptoms.
Swap for: Chives and the green tops of spring onions, plus herbs, ginger and spices. Check labels on stocks and seasoning mixes.
2. Wheat and Rye
Wheat and rye are listed among high-FODMAP grains. This is about fermentable carbohydrates, not gluten, so gluten-free is not automatically the same as low-FODMAP.
Swap for: Quinoa and oats, which the Cleveland Clinic lists as low-FODMAP, plus rice.
3. Beans and Lentils
Legumes are on the high-FODMAP list and are a classic gas producer. They are also valuable for protein and fiber, so they are a good candidate for the reintroduction phase later.
Swap for: Eggs, plain cooked meat, poultry and seafood, which the Cleveland Clinic lists as low-FODMAP.
4. Milk, Ice Cream and Soft Cheeses
Dairy foods with a lot of lactose, such as milk, ice cream and soft cheeses, are on the high-FODMAP list. Not everyone with SIBO reacts, so this is worth testing rather than assuming.
Swap for: Lactose-free milk, almond or soy milk (both on the low-FODMAP examples), or hard aged cheeses in small portions if you tolerate them.
5. Apples, Pears and Cherries
These fruits are named as high-FODMAP. Fruit is not bad for you, and you do not need to cut out all fruit.
Swap for: Grapes, oranges and strawberries, which the Cleveland Clinic gives as low-FODMAP examples.
6. Cauliflower and Mushrooms
Both appear on the high-FODMAP vegetable list. This surprises people who think of vegetables as always safe.
Swap for: Carrots, cucumbers, tomatoes and pumpkin, listed by the Cleveland Clinic as low-FODMAP. Our high-fiber low-FODMAP grocery list has many more ideas.
7. Honey
Honey is listed among the sweeteners to avoid during the elimination phase because of its fermentable sugars.
Swap for: Small amounts of sugar or maple syrup, if you tolerate them. Check with your dietitian on amounts.
8. Sugar-Free Gum, Candy and “Diet” Products
Xylitol and sorbitol appear on the Cleveland Clinic’s high-FODMAP sweetener list. They show up in sugar-free gum, mints, protein bars and some “diet” desserts, and they are poorly absorbed in the gut.
Swap for: Regular versions in small amounts, or products without polyols. Read the ingredient list for names ending in “-ol”.
9. Cashews and Pistachios
These two nuts are named as high-FODMAP. Other nuts and seeds, such as walnuts and pumpkin seeds, are listed as low-FODMAP examples.
Swap for: A small handful of walnuts or pumpkin seeds.
10. Staying on a Strict Diet for Too Long
This is the habit that causes the most harm. The Cleveland Clinic says long-term use of the low-FODMAP diet is not recommended, and that foods should be reintroduced one group at a time after the elimination phase. A very restrictive diet with no end date can lead to avoidable nutrient gaps and a poorer relationship with food.
What to do instead: Plan the reintroduction up front, ideally with a registered dietitian. The Cleveland Clinic says a dietitian can personalize your food plan after treatment.
Quick Reference
| Group | Higher-FODMAP examples | Lower-FODMAP examples |
|---|---|---|
| Fruit | Apples, pears, cherries | Grapes, oranges, strawberries |
| Vegetables | Onions, cauliflower, mushrooms | Carrots, cucumbers, tomatoes, pumpkin |
| Dairy | Milk, ice cream, soft cheeses | Almond or soy milk |
| Legumes | Beans, lentils | Eggs, plain meat, poultry, seafood |
| Grains | Wheat, rye | Quinoa, oats |
| Nuts | Pistachios, cashews | Walnuts, pumpkin seeds |
| Sweeteners | Honey, xylitol, sorbitol | Small amounts of sugar or maple syrup |
How to Use This List
- Get a diagnosis first. SIBO is usually diagnosed with a breath test, and symptoms overlap with IBS and other conditions, so do not self-treat on guesswork.
- Treat diet as support for medical care, not a replacement. Ask your doctor about antibiotics or other treatment.
- If you try an elimination phase, plan for about three to four weeks, then reintroduce one group at a time, as the Cleveland Clinic describes.
- Ask about an elemental diet. This is a liquid-only diet used for about two to three weeks, and the Cleveland Clinic says research supports it when followed consistently, but it is hard to stick to and works best with a dietitian.
- Keep a symptom diary so you know which foods you can add back.
For ready-made meals, see our 7-day SIBO diet meal plan. If you also have IBS, the 7-day low FODMAP meal plan may help, and our guide to foods that reduce bloating has gentle options.
Frequently Asked Questions
Can diet cure SIBO?
Not on its own. The Cleveland Clinic presents diet as one option alongside antibiotics or complementary therapies. Work with your doctor on treatment.
Is there an official SIBO diet?
No. The Cleveland Clinic says there is no official SIBO diet. Low-FODMAP and elemental diets are the usual approaches, and the research behind the low-FODMAP diet for SIBO specifically is limited.
How long should I avoid high-FODMAP foods?
The Cleveland Clinic describes an elimination phase of about three to four weeks while being treated, followed by reintroducing one group at a time. Long-term use is not recommended.
Will SIBO come back?
It can. The Cleveland Clinic says at least 50% of people may have SIBO recur, so ask your doctor about the underlying cause and follow-up.
Do I still need fiber?
Yes, in the long run. Fiber-rich foods are part of a healthy gut, which is why reintroduction matters. See our guide to fiber and gut health once your symptoms settle.
The Bottom Line
Onions, garlic, wheat, beans, lactose-heavy dairy, certain fruits and vegetables, honey and sugar alcohols are the usual high-FODMAP suspects in SIBO, but a strict diet should be short and supervised, not a lifelong rulebook. Pair a time-limited food plan with proper diagnosis and treatment, then reintroduce foods so your diet stays as varied as possible.
This article is for informational purposes only and is not a substitute for professional medical advice. Please consult your healthcare provider or a registered dietitian before making significant changes to your diet, especially if you are managing a medical condition or taking medication.
