The Worst Trigger Foods for IBS

If you have IBS, the last thing you want to do is to eat something that is going to make your symptoms worse. Some kinds of food have a reputation for being IBS trigger foods due to the effect that they may have on your digestive system.

But every person with IBS responds to food differently. Therefore, you might find that you can tolerate a food that is verboten for your friend who also has IBS.

Only through keeping a simple food diary, tracking what you eat and how you feel, can you be assured that a specific food contributes to your digestive symptoms. You'll also need to become diligent in reading the labels for everything you put in your mouth, including supplements and over-the-counter medications.

It is important to remember that other factors, such as emotional upset or simply eating too large a meal, could also be playing a role in your digestive upset. To help you in the process of finding your triggers, let's take a look at some of the most likely culprits.

Greasy Food

Hand taking French fries from bowl
Westend61 / Getty Images

Food with a high fat content can serve to increase the strength of intestinal contractions triggered by the body's own natural ​gastrocolic reflex. If you have a sensitive digestive system, you should avoid fatty meats and fried food. For example:

  • Pizza
  • Sausage
  • French fries
  • Fried chicken or fish 
  • Foods with heavy or creamy gravy
  • Steaks and burgers (red meat)

This doesn't mean to avoid fat altogether. Foods with healthy fat, such as fish and nuts can be quite beneficial for your digestive and overall health.

Dairy Products

Ice cream flavors on display in a store freezer
Saibal / Getty Images

A large number of people suffer from a condition known as lactose intolerance, in which their bodies are unable to digest lactose, the sugar found in dairy products. Lactose intolerance can lead to digestive symptoms of bloating, cramping and diarrhea.

Common dairy products include:

  • Milk
  • Cheese
  • Ice cream

You may find that you can enjoy some cheeses that have low lactose levels such as Brie, Camembert, mozzarella, and Parmesan, as well as lactose-free milk products.


Close-up view of wheat with blurry sky in the background

Gregoria Gregoriou Crowe fine art and creative photography / Getty Images

Although a diet high in fiber is important for overall health, certain high fiber foods may be problematic. For people with celiac disease, ingesting a protein called gluten found in some whole grains (wheat, rye, barley) causes the body's immune system to attack the small intestine with the result of serious health problems.

Even if you don't have celiac disease, you may find that you have difficulty eating foods made with gluten-containing whole grains, because they contain fructans, ​a type of FODMAPs.

Unfortunately, gluten-containing foods include such popular items as pasta, bread, and baked goods. Fortunately, it is now much easier to find gluten-free options.

High-FODMAP Fruits

Apples and pears on display for sale
Danita Delimont / Getty Images

Researchers at Monash University in Australia have systematically tested various fruits for their FODMAP content. These are short-chained carbohydrates such as the fructose in fruit that some people have difficulty absorbing.

Foods higher in FODMAPs may be problematic for people who have IBS due to their fermentation and osmotic effects. The following fruits have been found to be high in FODMAPs:

  • Apples
  • Apricots
  • Blackberries
  • Cherries
  • Grapefruit
  • Mango
  • Pears
  • Nectarines
  • Peaches
  • Plums and prunes
  • Pomegranates
  • Watermelon

Fortunately, there are some fruits that are low FODMAP foods.

Also, many people with IBS report that they have some difficulty with raw fruits. Cooking fruits may make them easier for your system to handle.

High-FODMAP Vegetables

Roasted organic cauliflower steak on baking dish
istetiana / Getty Images

Like fruits, vegetables are an important part of a healthy diet. However, some vegetables are also high in FODMAPs and therefore may contribute to your IBS symptoms:

  • Artichokes
  • Asparagus
  • Avocado
  • Beets
  • Brussels sprouts
  • Cauliflower
  • Celery
  • Garlic
  • Leeks
  • Mushrooms
  • Okra
  • Onions
  • Peas
  • Scallions (white parts)
  • Shallots
  • Snow peas
  • Sugar snap peas

Don't avoid vegetables altogether! Vegetables are essential for your overall health and the health of your gut flora

Like fruits, some vegetables may be harder to tolerate if they are eaten raw. You may find that you can handle vegetables better if they are cooked or juiced.

Beans and Legumes

Legumes on different spoons

Westend61 / Getty Images

You have probably learned the hard way that beans and IBS do not play nicely together. This is because beans and legumes contain carbohydrates that are poorly digested and thus are available to gut bacteria for fermentation, the by-product of which is intestinal gas.

These may be likely to produce gas:

  • Baked beans
  • Black-eyed peas
  • Butter beans
  • Chickpeas
  • Lentils
  • Kidney beans
  • Lima beans
  • Soybeans
  • Split peas

If you are a vegetarian, you may find that it is challenging to meet your protein needs without eating enough beans and legumes. You may find that you can tolerate small amounts of canned lentils or chickpeas if they have been well-rinsed.

Spicy Foods

Chili peppers for sale in basket
Jason Langley / Getty Images

An interesting study suggests that spicy food may contribute to the abdominal pain seen in IBS. The study found evidence that IBS patients have a greater number of a specific type of nerve fiber that reacts with pain to a substance within chili peppers. Chili peppers are a common ingredient in those spicy foods that set your mouth aflame.

Artificial Sweeteners

Sugar and sweetener packets in a container

Sharon Pruitt / Getty Images

Artificial sweeteners, typically those ending in "-ol", found in many sugar-free and diet foods, are often poorly tolerated, resulting in symptoms of gas and bloating. Be sure to read the labels of the following products carefully:

  • Sugar-free gum
  • Sugar substitute packets for coffee
  • Sugar-free ice cream

Sweeteners that may be better tolerated include table sugar, maple syrup, and stevia.


Restaurant table with a soda drink
LeoPatrizi / Getty Images

Although you may love your soda, it may not love you. Soda is carbonated which can contribute to problems with intestinal gas and bloating. The high amount of sugar in regular soda may add to an imbalance in your gut bacteria, causing further gas.

Diet soda is no better as your gut may react negatively to the artificial sweeteners. Water, iced tea, or diluted cranberry juice are much better options.


Three glasses of rum on a barrel.

David Sanger / Getty Images

Don't overlook what you are drinking when looking for IBS triggers. Alcohol has a long-standing reputation as being a GI irritant. Rum, in particular, is high in FODMAPs, as are many mixers.

This doesn't mean you can't occasionally enjoy a drink. Probably your safest bet is to stick to a small amount of red wine.

Coffee and Other Drinks with Caffeine

Woman pouring coffee from pour over coffee maker into red cup

Seth Restaino / Getty Images

It may be hard to live without your morning cup of coffee. But caffeine is known to be an IBS trigger for some people. If you are used to having caffeine, you are likely to have some caffeine withdrawal for the first few days. But you may need to try to eliminate it to see if your IBS symptoms improve.

Big Meals

Freshly prepared meal of English breakfast and spaghetti bolognese
d3sign / Getty Images

It's not just what you eat, but also how much. Avoiding large meals can be part of your strategy to eliminate triggers. Graze or have smaller meals instead.

A Word From Verywell

Living with IBS can mean many changes in what you eat and what you find you must avoid. If you can reduce the trigger foods in your diet, it might help relieve some of your symptoms and avoid IBS attacks. But eating a balanced diet is also critical for your overall health. Don't eliminate entire categories of food, such as vegetables. Find the ones that work best for you so you can ensure good nutrition.

Was this page helpful?
Article Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Buscail C, Sabate JM, Bouchoucha M, et al. Western Dietary Pattern Is Associated with Irritable Bowel Syndrome in the French NutriNet Cohort. Nutrients. 2017;9(9). doi:10.3390/nu9090986

  2. Xiong L, Wang Y, Gong X, Chen M. Prevalence of lactose intolerance in patients with diarrhea-predominant irritable bowel syndrome: data from a tertiary center in southern China. J Health Popul Nutr. 2017;36(1):38. doi:10.1186/s41043-017-0113-1

  3. Volta U, Pinto-sanchez MI, Boschetti E, Caio G, De giorgio R, Verdu EF. Dietary Triggers in Irritable Bowel Syndrome: Is There a Role for Gluten? J Neurogastroenterol Motil. 2016;22(4):547-557. doi:10.5056/jnm16069

  4. Varney J, Barrett J, Scarlata K, Catsos P, Gibson PR, Muir JG. FODMAPs: food composition, defining cutoff values and international application. J Gastroenterol Hepatol. 2017;32 Suppl 1:53-61. doi:10.1111/jgh.13698

  5. Cozma-petruţ A, Loghin F, Miere D, Dumitraşcu DL. Diet in irritable bowel syndrome: What to recommend, not what to forbid to patients! World J Gastroenterol. 2017;23(21):3771-3783. doi:10.3748/wjg.v23.i21.3771

  6. Akbar A, Yiangou Y, Facer P, Walters JR, Anand P, Ghosh S. Increased capsaicin receptor TRPV1-expressing sensory fibres in irritable bowel syndrome and their correlation with abdominal pain. Gut. 2008;57(7):923-9. doi:10.1136/gut.2007.138982

  7. Ruiz-ojeda FJ, Plaza-díaz J, Sáez-lara MJ, Gil A. Effects of Sweeteners on the Gut Microbiota: A Review of Experimental Studies and Clinical Trials. Adv Nutr. 2019;10(suppl_1):S31-S48.

  8. Reding KW, Cain KC, Jarrett ME, Eugenio MD, Heitkemper MM. Relationship between patterns of alcohol consumption and gastrointestinal symptoms among patients with irritable bowel syndrome. Am J Gastroenterol. 2013;108(2):270-6.

  9. Capili B, Anastasi JK, Chang M. Addressing the Role of Food in Irritable Bowel Syndrome Symptom Management. J Nurse Pract. 2016;12(5):324-329. doi:10.1016/j.nurpra.2015.12.007

  10. Okawa Y, Fukudo S, Sanada H. Specific foods can reduce symptoms of irritable bowel syndrome and functional constipation: a review. Biopsychosoc Med. 2019;13:10. doi:10.1186/s13030-019-0152-5

Additional Reading
  • Eating, Diet & Nutrition for Irritable Bowel Syndrome. National Institute for Diabetes and Digestive and Kidney Diseases.

  • Akbar A, Yiangou Y, Facer P, Walters J, Anand P, Ghosh S. Increased capsaicin receptor TRPV1-expressing sensory fibres in irritable bowel syndrome and their correlation with abdominal pain. Gut 2008 57:923-929.

  • Gibson P, Shepherd S. Evidence-based dietary management of functional gastrointestinal symptoms: The FODMAP approach. Journal of Gastroenterology and Hepatology 2010 25:252-258.

  • Whorwell P. Dietary Aspects of Irritable Bowel Syndrome (IBS). Digestive Health Matters 2007 16:6-7.