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Eating for IBS

A structured low-FODMAP path to a calmer gut.

By Camille McLaughlin, RDN, LD, registered dietitian nutritionist

IBS brings bloating, gas, cramping, and irregularity, and it often responds to the low-FODMAP approach developed by Monash University. You temporarily reduce the fermentable carbs that trigger symptoms, then reintroduce them one at a time to learn your personal triggers.

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How it works

It runs in three phases. First a strict low-FODMAP stretch to settle symptoms, then a structured reintroduction to find what you tolerate, and finally a relaxed, personalized pattern that avoids only your real triggers. (It's the same approach as our Low-FODMAP plan.)

✓ What you'll eat

Low-FODMAP proteins and vegetables: carrots, zucchini, spinach, peppers
Low-FODMAP fruit: berries, kiwi, orange
Rice, quinoa, and oats
Hard cheeses and lactose-free dairy
Garlic-infused oil for flavor without the FODMAPs

✕ What you'll limit

Onion and garlic
Wheat and rye
Beans, lentils, and chickpeas
High-FODMAP fruit: apple, pear, mango, watermelon
Lactose
Cauliflower, mushrooms, asparagus
Honey and polyol sweeteners

Who it's a good fit for

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

What the research shows

IBS used to get filed under "it's all in your head," and the modern understanding is more interesting than that: it's a disorder of gut-brain interaction. The nerves connecting your gut and your brain run a little more sensitively, so ordinary digestion can register as pain, bloating, or urgency, and stress, poor sleep, and anxiety really turn the volume up. That's why food is a huge lever but not the only one, and why managing IBS well usually means minding your stress and sleep alongside your plate.

On the food side, low-FODMAP has the strongest evidence of any diet for IBS, which is why the plan is built around it (the Low-FODMAP page has the full picture). But it's worth knowing it's usually a second step. A lot of people get real relief first from simpler changes: eating regular meals instead of skipping and then overeating, easing off caffeine, alcohol, and very fatty meals, and not overdoing the sugar-free "polyol" sweeteners. Fiber helps too, but the type matters. The soluble kind in oats and psyllium tends to soothe, while coarse insoluble fiber can rough things up, especially if you lean toward constipation or diarrhea. We keep all of that in mind when we build.

What to keep in mind

The most important thing with IBS is making sure it's actually IBS. The symptoms overlap with conditions that need real treatment, so it's worth getting a proper diagnosis before you settle into a management plan. A few signs mean see a doctor first rather than assume: blood in your stool, unexplained weight loss, iron-deficiency anemia, symptoms that wake you at night, a new change in your bowels after age 50, or a family history of celiac disease, inflammatory bowel disease, or bowel cancer. Celiac in particular is worth ruling out, since it can masquerade as IBS. Once you know what you're dealing with, low-FODMAP is one of the best tools there is, and it goes best with a dietitian's guidance through the reintroduction step.

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 goal is to reintroduce foods, not to restrict forever. It's worth having your IBS diagnosis confirmed first, since these symptoms can overlap with other conditions.

Common questions

Do I have to eat this way forever?

No. The strict phase is short, just a few weeks, and then you reintroduce foods and usually end up eating far more than you'd expect.

Do I lose garlic and onion for good?

Usually not. Garlic-infused oil gets you through the strict phase, and plenty of people reintroduce them successfully afterward.

Is this the same as the Low-FODMAP diet?

Yes. Pick either Low-FODMAP as a diet or IBS as a condition, and we build it the same way.

Could I just take a probiotic instead?

It's a reasonable thing to want, but the evidence isn't there. The American College of Gastroenterology's 2021 IBS guideline recommends against probiotics for overall IBS symptoms, largely because the trials use different strains and doses and don't add up to a consistent result. What that same guideline does back is a limited trial of low-FODMAP, soluble fiber such as psyllium rather than the coarse insoluble kind, and, more cautiously, peppermint oil for symptom relief. If a probiotic clearly helps you there's no harm in keeping it, but it won't do the job of finding your own triggers.

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