Brussels Sprouts
Vegetables · Cruciferous
Two Brussels sprouts, about 38 g, rate green. Five or six, 90 g, are rated red even though no single FODMAP group crosses its own high threshold at that portion: fructans reach 0.28 g, GOS 0.24 g, sorbitol 0.19 g and mannitol 0.12 g. The load is spread across four groups at once, which is what makes an ordinary serve of sprouts hard work.
Last updated 3 September 2026Serving sizes for brussels sprouts
Two sprouts (38 g) rate green. Five or six sprouts (90 g) are rated red.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 2 sprouts | 38 g | Fructans 0.12 g | |
| 5-6 sprouts | 90 g | Fructans 0.28 g |
Breakdown for 2 sprouts
Is brussels sprouts low FODMAP?
Sprouts are unusual in carrying four FODMAP groups in meaningful amounts at the same time. At two sprouts every figure is small: 0.12 g of fructans, 0.1 g of GOS, 0.08 g of sorbitol and 0.05 g of mannitol, and that serve rates green. Roughly double the portion and each figure roughly doubles, yet even at five or six sprouts the fructans stop just short of the 0.3 g high mark and the sorbitol just short of 0.2 g. The rating reflects the total, because your gut does not sort FODMAPs into separate queues.
Brussels Sprouts and IBS: what to know
Sprouts make a poor test food. A reaction to five of them tells you nothing about which group caused it, since you have taken fructans, GOS and two polyols in one mouthful; if you are working through reintroductions, test each group with something that carries only that group. They also rarely arrive alone. On a roast dinner the stuffing and the gravy usually bring onion fructans of their own, and the gut reads the plate as one dose rather than as separate vegetables.
Gut-friendly ways to eat brussels sprouts
Two or three sprouts is a real serve if the rest of the plate carries the volume. Halve them so they look like more, roast them hard so each one tastes of something, and fill the space around them with green beans, carrot, parsnip and potato, all rated green in this guide. Dress them with bacon, chestnuts, lemon or garlic-infused oil rather than an onion gravy, because what tips a sprout serve over is usually the sauce it arrives in.
Frequently asked questions
How many Brussels sprouts can I eat with IBS?
Two sprouts, around 38 g, is the tested green serve, and five or six at 90 g is rated red. Three or four sits in untested territory, so treat that as a personal experiment rather than a known safe amount. Most people find sprouts easier to manage as halves scattered through a plate of other vegetables than as a bowl of their own.
Why do Brussels sprouts cause so much gas and bloating?
Two reasons stack up. They carry GOS, the same group that makes tinned beans and lentils windy, and they carry sorbitol and mannitol, polyols that pull water into the bowel. A large serve can therefore produce wind and urgency by different routes at once. Some wind is ordinary fermentation of sprout fibre, which happens even at the green serve and is not a sign you have overdone it.
Can I eat Brussels sprouts at Christmas dinner?
Yes, at two or three, provided you spend the rest of your FODMAP budget carefully. Sprouts are rarely the whole problem at a roast: onion in the stuffing and gravy, wheat in the bread sauce and a generous serve of everything are usually stacked on top of them. Helping yourself to the sprouts first, before they are drowned in sauce, keeps the portion honest.
Does boiling Brussels sprouts lower their FODMAPs?
A little, but not enough to move a serve. Fructans and GOS dissolve in water, so some leaches into the pot and gets poured away; heat itself breaks nothing down, and the polyols stay put. Boiled, roasted and steamed sprouts are all counted the same at the same weight, so the number on your plate is what decides the rating.
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