Does Broccoli Trigger IBS?
It depends on the portion size. Broccoli is low-FODMAP in small servings (about 3/4 cup or 75g of heads) and generally tolerated by most people with IBS at that amount. However, larger portions become moderate to high in fructans and sorbitol, which can trigger bloating and gas.
What Makes Broccoli Problematic for IBS
Broccoli contains both fructans and sorbitol. At smaller servings these FODMAPs stay below the threshold, but they accumulate quickly as portions increase.
How it works
Fructans and sorbitol in broccoli are poorly absorbed. Sorbitol draws water into the bowel by osmosis while fructans are fermented, producing gas and bloating.
Common Symptoms
Symptoms are portion-dependent. A small side of broccoli is usually fine, but a full cup or more can trigger noticeable bloating within 2-4 hours.
Portion Thresholds
Safe Portion
Up to 3/4 cup (75g) per sitting
Research Reference
Monash University: Low-FODMAP at up to 3/4 cup (75g). High-FODMAP at 1+ cups.
Practical Tip
Broccoli heads contain more FODMAPs than stems. Steaming may make it slightly more digestible than eating raw.
How Broccoli Compares
Side-by-side FODMAP breakdowns for the swaps people most often weigh against Broccoli.
Related Foods
It depends on the portion size. Cauliflower is low-FODMAP in small servings (up to 1/2 cup or 65g) and generally tolerated by most people with IBS at that amount. However, larger portions become moderate to high in mannitol and sorbitol, which can trigger bloating, gas, and abdominal discomfort.
Yes. Asparagus is high in fructans and excess fructose, making it a common IBS trigger even at small portions. Eating more than one spear can provoke bloating, gas, and abdominal discomfort. It should be avoided during the elimination phase, with green beans or zucchini used as alternatives.
No. Zucchini (courgette) is considered low-FODMAP and is generally safe for people with IBS when eaten in moderate portions (up to about 65g per sitting). It is one of the most well-tolerated vegetables on a low-FODMAP diet. Very large servings may still cause minor discomfort in some sensitive individuals.
It depends on the colour, and this one changed. Monash retested capsicum and downgraded it from unlimited: red is low-FODMAP at only 43g (about a third of a cup) and tests high for excess fructose by 75g — one cup. Green is far more forgiving, low at 75g and not high until around 310g. Yellow and orange have never been tested. If you have been treating all peppers as a free food, red is the one to rein in.
No. Carrots are considered low-FODMAP and are generally safe for people with IBS at all portion sizes. They are one of the most reliable safe vegetables on a low-FODMAP diet. Most people tolerate them well whether raw, cooked, or steamed, without experiencing bloating or other digestive symptoms.
Frequently Asked Questions
How much broccoli can I eat with IBS?
Up to 3/4 cup (75g) per sitting is considered low-FODMAP. Beyond that, the fructan and sorbitol content rises above the threshold.
Is broccoli good or bad for IBS?
Broccoli is nutritious and can be part of a low-FODMAP diet in controlled portions. Stick to 3/4 cup or less per meal.
Sources & References
FODMAP grade and serving-size data for Broccoli are based on published research from Monash University, the institution that developed the low-FODMAP diet. To understand how this data fits into a structured protocol, see our complete elimination diet guide.
- Monash University — About FODMAPs & IBS
- Monash University — Starting the Low-FODMAP Diet
- Halmos et al. (2014) — Low-FODMAP diet reduces IBS symptoms (Gastroenterology)
- NIDDK (NIH) — Irritable Bowel Syndrome
FODMAP thresholds are updated as new research is published. If you notice a portion that no longer matches the latest Monash guidance, let us know and we will update the page.
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