Is Onion low FODMAP?

Q: Is Onion low FODMAP?

High FODMAP. Onion is one of the most common IBS triggers. It's high in fructans, a type of FODMAP that ferments in the gut and can cause bloating, gas, and pain. Onion powder and onion in stocks and sauces count too, which makes it a frequent hidden trigger.

High FODMAP

FODMAP group: Fructans

Serving guidance

High in fructans even in small amounts — there is no reliable low-FODMAP serving of onion bulb.

Why

Onion is one of the most common IBS triggers. It's high in fructans, a type of FODMAP that ferments in the gut and can cause bloating, gas, and pain. Onion powder and onion in stocks and sauces count too, which makes it a frequent hidden trigger.

Low-FODMAP swaps

The green tops of spring onions/scallions
Garlic-infused oil for flavor
Chives
A pinch of asafoetida

Does Onion trigger YOUR symptoms?

General ratings are only a starting point — real tolerance is personal. FODMAP Log tracks what you actually eat and how you feel, then works out which foods are triggers for you, with a report you can hand to your dietitian.

More foods

BlueberriesLow FODMAP

White riceLow FODMAP

BroccoliLow FODMAP

StrawberriesLow FODMAP

HoneyHigh FODMAP

SpinachLow FODMAP

This is general, informational guidance compiled from published low-FODMAP literature — not a certified rating and not medical advice. FODMAP Log is not affiliated with or certified by Monash University. Personal tolerance varies; always work with a qualified dietitian.