The Low-FODMAP Diet: A Beginner's Guide to Less Bloating

If you've tried cutting obvious trigger foods and still bloat, the low-FODMAP diet is worth knowing about. Developed by researchers at Monash University, it's the most evidence-backed dietary approach for reducing bloating and digestive discomfort, particularly for people with IBS. Here's what it is, how it works, and how to approach it sensibly.

What are FODMAPs?

FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides And Polyols — specific types of carbohydrates that some people's guts can't absorb well. Instead of being digested normally, they travel to your colon where gut bacteria ferment them, producing gas and drawing water into the gut. For some people, that process causes significant bloating, gas, cramping and irregular bowels.

Common high-FODMAP foods

Some of the most familiar high-FODMAP foods include:

• Onions and garlic (high in fructans)
• Wheat and rye products
• Apples, pears, watermelon and peaches
• Dairy with lactose (milk, soft cheeses, ice cream)
• Beans, lentils and chickpeas
• Mushrooms and cauliflower
• Sugar-free sweeteners (sorbitol, xylitol, mannitol)

Many of these are genuinely healthy foods — the point isn't that they're bad, it's that they may be hard for your particular gut to handle. Sensitivity varies enormously from person to person. For the full list, see our guide to foods that commonly cause bloating.

How the low-FODMAP diet works

It's designed as a three-phase process, not a permanent way of eating:

Phase 1: Elimination (2–6 weeks)

You eat a low-FODMAP diet, removing the main high-FODMAP foods. This tells you whether FODMAPs are a significant driver of your symptoms — if you feel a lot better, they probably are.

Phase 2: Reintroduction (6–8 weeks)

You reintroduce FODMAP groups one at a time to identify which specific ones trigger your symptoms and which you tolerate fine. This is the most important phase: it tells you exactly what's causing the problem.

Phase 3: Personalisation

You build a long-term way of eating that avoids or limits your specific triggers while keeping everything else. Most people end up tolerating many more foods than they expected — not everything needs to go.

A realistic note

The low-FODMAP diet is more involved than most dietary changes, and the reintroduction phase takes patience. It's best done with the guidance of a dietitian familiar with it, especially if you have IBS — they'll help you do it properly and not more restrictively than needed. For a more accessible starting place if you don't have a diagnosis, our free 7-day anti-bloat plan works through the common triggers in a simpler way.

Is it right for you?

The low-FODMAP diet has the strongest evidence for people with IBS. If you're not sure whether your bloating is IBS or everyday sensitivity, see our guide on IBS vs everyday bloating. If you don't have a diagnosis, trying a straightforward elimination of the most common triggers — onions, garlic, wheat, dairy — for a few weeks gives you most of the useful information without the full protocol.

Frequently asked questions

What can I eat on a low-FODMAP diet?

Plenty — rice, oats, potatoes, most vegetables, most fruits, eggs, fish, meat, tofu, most hard cheeses and lactose-free dairy, and many grains. It's more varied than most people expect.

How quickly does the low-FODMAP diet work?

Many people notice a meaningful reduction in bloating and gas within the first one to two weeks of the elimination phase.

Do I have to follow it forever?

No — that's the point of the reintroduction phase. Most people find they can tolerate several FODMAP groups and only need to limit the specific ones that trigger them.