Cauliflower
Vegetables · Cruciferous
Cauliflower is one of the classic FODMAP surprises. A small serve of 50 g, about a third of a cup, rates green, but at 100 g it’s already rated red, driven by mannitol rising from 0.15 g to 0.3 g. That’s a narrow window for a vegetable most recipes use by the head, so portions matter more here than almost anywhere.
Last updated 3 September 2026Serving sizes for cauliflower
A green serve is 50 g, about 1/3 cup. At 100 g (2/3 cup) the rating is red.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1/3 cup | 50 g | Mannitol 0.15 g | |
| 2/3 cup | 100 g | Mannitol 0.3 g |
Breakdown for 0.33 cups
Is cauliflower low FODMAP?
Cauliflower’s main FODMAP is mannitol, a polyol. At the 50 g serve there’s 0.15 g, just under the 0.2 g level where a portion starts rating moderate, alongside traces of fructans (0.05 g), GOS and sorbitol. Double the portion and everything doubles: 100 g carries 0.3 g of mannitol plus 0.1 g of fructans, and the serving rates red. Note there’s no amber buffer in the data; cauliflower jumps straight from green at 50 g to red at 100 g, which is unusual and worth respecting.
Cauliflower and IBS: what to know
Polyols like mannitol are absorbed slowly and incompletely, drawing water into the gut, which is why they’re a common trigger for the looser, crampier side of IBS. Cooking doesn’t help here: heat doesn’t destroy mannitol, so roasted or steamed cauliflower carries the same rating as raw at the same weight. The practical risk is accumulation, since 50 g is a garnish-sized amount and a curry, soup or tray bake can hold several times that per person. Weigh it once to calibrate your eye.
Gut-friendly ways to eat cauliflower
Treat cauliflower as an accent, not the base: a few small florets in a mixed roast stays near the 50 g green serve. For anything bigger, the classic swap is broccoli, which rates green at its tested serve and roasts, steams and mashes the same way; broccolini works too. Cauliflower rice is the trap, since a typical serve easily exceeds the 100 g rated red. A rice made from grated zucchini or plain rice keeps the dish gut friendly.
Frequently asked questions
Is cauliflower high FODMAP?
At everyday portions, yes. Only a small 50 g serve, about a third of a cup, rates green. At 100 g cauliflower is rated red, with 0.3 g of mannitol. Since most recipes use far more than 100 g per person, cauliflower is usually treated as a food to limit tightly during elimination.
Can I eat cauliflower rice on a low FODMAP diet?
It’s risky. A bowl of cauliflower rice weighs well over the 100 g that rates red in our data, so a rice-sized portion lands deep in high FODMAP territory. If you want the format, use plain rice or grate zucchini instead; if you want cauliflower, keep it to a 50 g accent within a mixed dish.
Does cooking cauliflower make it low FODMAP?
No. Heat doesn’t break down mannitol, so roasted, steamed or boiled cauliflower rates the same as raw at the same weight: green at 50 g, red at 100 g. Cooking may make the fibre feel gentler, but the FODMAP load and the rating don’t change with the cooking method.
What can I use instead of cauliflower?
Broccoli is the closest match and rates green at its tested serve in our guide, covering roasts, stir-fries and mash-style purées. Broccolini rates green too. For cauliflower rice, plain rice or grated zucchini gives the same bulk without the mannitol that puts 100 g of cauliflower in the red.
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