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The Low-FODMAP Diet

A structured, science-backed way to calm IBS and figure out which foods set it off.

By Camille McLaughlin, RDN, LD, registered dietitian nutritionist

If your gut has been unpredictable for years and nobody has been able to tell you why, this is the process that usually finds the answer. Low-FODMAP is an eating approach developed by Monash University to ease the symptoms of IBS: the bloating, gas, cramping, and irregularity that certain fermentable carbohydrates (FODMAPs) can set off in a sensitive gut. You take out the most common triggers for a while, then add them back one at a time so you learn exactly which ones bother you.

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How it works

It runs in three phases. First you eat strictly low-FODMAP for 2 to 6 weeks to settle your symptoms. Then you reintroduce each FODMAP group one at a time to see what you tolerate. Finally you land on a personalized, mostly relaxed way of eating that avoids only your real triggers. It's a diagnostic tool, and the whole point is to get you eating more by the end, not less. It's also a lot easier with recipes built for it.

✓ What you'll eat

Proteins: chicken, fish, eggs, firm tofu, beef
Low-FODMAP vegetables: carrots, zucchini, spinach, bell pepper, cucumber, potato
Low-FODMAP fruit: berries, oranges, grapes, kiwi
Rice, quinoa, oats, and certified low-FODMAP grains
Hard cheeses and lactose-free dairy
Garlic-infused oil for flavor without the FODMAPs

✕ What you'll limit

Onion and garlic (the biggest triggers)
Wheat and rye: regular bread and pasta
Beans, lentils, and chickpeas
High-FODMAP fruit: apple, pear, mango, watermelon, stone fruit
Lactose: milk, soft cheese, yogurt
Cauliflower, mushrooms, and asparagus
Honey and sweeteners like sorbitol and xylitol

Who it's a good fit for

People with IBS or ongoing bloating, gas, cramping, or irregularity who want a proven, structured way to find some calm and pin down their triggers, ideally with a dietitian's guidance.

What the research shows

Low-FODMAP isn't a fad. It came out of research at Monash University in Australia, and for a gut problem it's about as well-studied as diets get. Across the trials, up to three-quarters of people with IBS get real relief from the bloating, gas, cramping, and irregularity within about six weeks. That's why gastroenterologists and dietitians reach for it as a first-line approach when IBS won't settle down on its own.

Its home turf is IBS, and that's where the evidence is strongest. It's also being looked at for a few related situations: people with inflammatory bowel disease who are in remission but still have IBS-type symptoms, small intestinal bacterial overgrowth (SIBO), and plain functional bloating. The research there is thinner and still coming together, so we treat it as worth a careful try rather than a settled answer.

What to keep in mind

The single most important thing about this diet is that the strict phase is temporary. FODMAPs aren't bad for you. They're fermentable fibers, and many of them are the exact foods that feed the good bacteria in your gut. Taking them out for a stretch quiets your symptoms so you can see clearly, but living in that strict phase for months isn't the goal and can work against you. Long-term over-restriction can thin out your fiber, calcium, B vitamins, and iron, and it tends to lower your Bifidobacteria, one of the friendly gut species. The fix is built into the diet: you reintroduce foods group by group and land on the most varied way of eating your gut will tolerate.

This is also the diet where a little support really pays off. It's fiddly, the reintroduction step is where the real answers come from, and it's easy to get stuck on a shrinking list of "safe" foods if you go it alone. That's why every plan comes with low-FODMAP recipes and a step-by-step guide through all three phases, and if you're able to work with a registered dietitian through the reintroduction, even better. If you're pregnant, underweight, or have any history of disordered eating, note it when you start, because a strict elimination phase isn't always the right move, and the plan builds around what you tell us.

A dietitian's note

This one is squarely in our wheelhouse, and it's one of our favorites to build for. Low-FODMAP is meant to be temporary. The strict phase is short, and the goal is to reintroduce foods, not to avoid them forever. Done long-term without the reintroduction step, it's needlessly restrictive. One trick the plans use: garlic-infused oil gives you the garlic flavor without the FODMAPs, because the trigger isn't oil-soluble.

Read the guide first, free

The full step-by-step guide through all three phases is on this site, open to anyone. Read it →

Common questions

Is low-FODMAP a weight-loss diet?

No. It's built to reduce digestive symptoms, not to drop weight. It's a short-term process of taking foods out and adding them back to find your triggers.

How long do I avoid these foods?

The strict phase usually runs 2 to 6 weeks. After that you reintroduce foods one group at a time, and most people end up able to eat far more than they expected.

Do I have to give up garlic and onion forever?

No. They're common triggers, so they come out during the elimination phase, but you reintroduce them to test how you do. In the meantime, garlic-infused oil gives you the flavor safely.

What if I finish the strict phase and nothing improves?

Then you stop, and that counts as information rather than failure. The ACG guideline notes that people who respond to FODMAP restriction can be identified within about two to six weeks, so if you have eaten strictly that long with no change, staying on it longer rarely helps and costs you fiber and variety. Take it back to your doctor, because bloating and irregularity have other causes worth ruling out, celiac disease among them. A meaningful share of people with IBS don't respond to this diet, and there are other approaches for them.

Ready for a Low-FODMAP plan built for you?

Answer a few quick questions and we'll build four weeks of Low-FODMAP meals, with recipes customized to you and a smart grocery list.

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