FODMAPs are a group of short-chain carbohydrates found in everyday foods such as pasta, bread, onions, garlic, beans, milk, apples, honey and mangoes. FODMAPs are commonly malabsorbed in the small intestine, causing uncomfortable symptoms such as abdominal pain, bloating, diarrhea and/or constipation in those suffering with irritable bowel syndrome (IBS).
The Low FODMAP diet was first defined in 2004 by researchers at Monash University, in Australia. It categorizes FODMAP foods that trigger gastrointestinal problems according to the type of carbohydrate they contain, i.e., Oligosaccharides, Disaccharides, Monosaccharides, and Polyols.
The Low FODMAP diet is the go-to dietary intervention for those suffering with IBS.45 million Americans(1 billion worldwide) suffer from IBS. There are15 timesmore people who suffer from IBS than celiac disease which gave rise to the gluten-free diet. Studies show that following a Low FODMAP diet can provide complete symptom relief for up to75%of people suffering from IBS, which is characterized by recurrent episodes of lower abdominal pain, bloating, diarrhea and/or constipation.
The Low FODMAP diet is not a wellness trend — it is a clinically validated dietary therapy.
Clinical studies consistently show that approximately 3 out of 4 people with IBS experience meaningful symptom improvement when following the diet correctly. Research published in peer-reviewed journals, including the Journal of Gastroenterology, has validated its efficacy across multiple patient populations and IBS subtypes. Comfort is typically measurable within 2 to 6 weeks of starting the elimination phase, making it one of the fastest-acting dietary interventions available for digestive symptoms.
It is also worth noting that the diet has been studied in relation to conditions beyond IBS, including SIBO (small intestinal bacterial overgrowth) and functional dyspepsia, both of which share overlapping symptoms. If you have been diagnosed with one of these conditions, speak with your gastroenterologist or registered dietitian about whether a Low FODMAP approach may be appropriate for your situation.
One important caveat: the diet does not work for everyone. Approximately 1 in 4 people with IBS sees limited improvement, which is why working with a registered dietitian — rather than self-directing the process — gives you the best chance of identifying your true trigger foods and achieving lasting comfort.
First, take a deep breath! Seriously…stress can trigger tummy trouble, so try not to get overwhelmed before you even start the low FODMAP diet.
Next, contact a knowledgeable dietitian to help guide you through the process. This may seem indulgent or unnecessary considering how much information is available online, but it will ensure that you are following the three phases of the diet correctly. If you feel confident that you can go it alone, try to wait until you have time to mentally and physically prepare yourself. You’ll be much more successful if you understand the low FODMAP concept, are aware of which IBS foods to avoid, have collected some good low FODMAP recipes, and have stocked your kitchen with low FODMAP foods.
Instead of being properly digested and absorbed, FODMAPs travel through the gastrointestinal tract, drawing excess fluid into the small intestine and generating gas when they are fermented by bacteria in the large intestine.
The fluid and gas build-up caused by undigested FODMAPs pushes on the walls of the intestines, causing uncomfortable symptoms and altered bowel habits in susceptible individuals.
A Low FODMAP elimination diet is not one diet, even though it’s often portrayed that way. It's one of three distinct and equally important parts of a complete low FODMAP diet.
The FODMAP Elimination diet phase, which is what most people think of when they hear the term low FODMAP diet, was never meant to be followed indefinitely. After you have achieved symptom relief during this phase, it’s time to systematically test one FODMAP group at time in order to discover which FODMAPs are problematic for you; this is the Reintroduction/ Challenge phase.
The Integration phase is the diet you will follow “forever.” It will be uniquely yours; it may change over time, and it will most certainly contain some high FODMAP foods. The type and amount of these foods varies from person to person depending on a number of factors, including which foods provoked symptoms during the Challenge phase.
Elimination: During this phase, high FODMAP foods are avoided until symptoms are eliminated or significantly reduced. This can take anywhere from two to six weeks, depending on severity of symptoms and ability to adhere to the FODMAP elimination diet.
Challenge/Reintroduction: In the challenge/reintroduction phase, High FODMAP foods from each group are added back from the initial FODMAP elimination diet step in a controlled fashion. There are many ways to approach this, but it is important to challenge only one type of FODMAP at a time. For instance, when testing oligosaccharides, the rest of your diet should not contain other FODMAPs or it will be impossible to tell which one is responsible for your symptoms.
Integration: Once you have determined which FODMAP group(s) are a problem for you, it’s time to integrate what you’ve learned into your everyday life. It's important to remember that your ultimate goal is to include as many nutritious FODMAP foods in your diet as you can, because total avoidance is neither healthy nor practical.
In some ways, this is the hardest phase of all, because there’s no one roadmap that will be right for everyone. The good news is, there are more low FODMAP recipes, packaged foods, and other resources available to help you on your journey than ever before.
For more detailed information about the low FODMAP diet, we've broken down each phase in detail here.
This can be a concern (especially for people who tend toward constipation) because many fiber-rich foods are also high in FODMAPs. That said, as long as you know where to look, it is possible to get your recommended 25 to 30 grams of fiber per day while also keeping a lid on your FODMAP intake. Here are some good options:
Brown rice, 1 cup (180 g) cooked – 3.5 grams fiber
Buckwheat groats (kasha), 3/4 cup (135 g) cooked – 3.5 grams fiber
Chestnuts, 10 roasted – 4 grams fiber
Chia seeds, 2 tablespoons − 9 grams fiber
Chickpeas, 1/4 cup (42 g) canned – 2.5 grams fiber
Flax seeds, 1 tablespoon – 3 grams fiber
Kiwi, 2 small – 5 grams fiber
Lentils, ½ cup (46 g) canned – 8 grams fiber
Macadamia nuts, 20 – 5 grams fiber
Oat bran, 2 tablespoons – 2 grams fiber
Orange, 1 medium – 3 grams fiber
Papaya, 1 cup (140 g) cubes – 3 grams fiber
Peanuts, 32 − 3 grams fiber
Quinoa, 1 cup (155 g) cooked – 5 grams fiber
Rice bran, 1 tablespoon – 2 grams fiber
White potato, with skin, 1 medium – 3.5 grams fiber
There are endless possibilities! Fody offers over 200 deliciouslow FODMAP recipesfor breakfast, lunch, dinner, snacks, and dessert. Our convenientlow FODMAP productsand recipesmake the low FODMAP lifestyle and everyday meal planning easy and absolutely delicious.
We have some great resources listed on our website! Here are some downloadable Low FODMAP food lists and guides, as well as IBS foods to avoid (High FODMAP Foods), to get you started:
No — although they overlap in some ways, they are different dietary approaches. The Low FODMAP diet restricts a group of fermentable carbohydrates, one of which (fructans) is found in wheat. Since wheat is reduced on the Low FODMAP diet, some people experience comfort from their symptoms and mistakenly conclude they have a gluten sensitivity. However, it's the fructans in wheat — not gluten itself — that are responsible for the improvement in most cases. Unlike a gluten-free diet, the Low FODMAP approach is temporary and systematic, designed to identify your personal triggers through a structured elimination-and-reintroduction process.
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