Is broccoli high FODMAP?

The trigger is in the stem, not the tree

Broccoli is one of the friendlier vegetables on a low-FODMAP diet, which surprises people who file every cruciferous green under "gassy." Monash tested it and the heads come back low FODMAP at 3/4 cup (about 75g) and stay low into bigger servings. The one FODMAP it carries is excess fructose, meaning it holds more fructose than the glucose that would normally escort that fructose across the gut wall. The leftover fructose is the part your small intestine struggles with.

Monash found the fructose is not spread evenly through the plant. It concentrates in the stalk, the woody stem most people think of as the bland, safe part. So the bushy florets, the bit that looks the most like it should ferment, are the gentler half. Whole broccoli passes at a generous serving because the low-fructose heads dilute the higher-fructose stems. Eat a pile of trimmed stalks on their own and you cross the line sooner, past about 65g. (Broccolini works the other way: there the excess fructose sits in the heads, so the parts swap.)

The mechanism is the one behind apple and honey. Your small intestine absorbs fructose through a slow door called GLUT5, and glucose holds a faster door open beside it. Fructose that arrives without enough glucose to pair off travels on to the colon, where gut bacteria ferment it into gas and it draws water in alongside. Gas plus water stretches the bowel wall, and a sensitive gut reads that stretch as bloating or cramping. With broccoli you only reach that dose if you load up on stalks.

Your broccoli ceiling isn't printed on the chart

These gram cutoffs are population thresholds, set so most people stay under their own line. Yours is set by your gut's sensitivity, how fast food moves through you, and how much other fermentable load already arrived that day. Fructose stacks. The excess fructose in broccoli draws on the same budget as the apple in your lunch, the honey in your tea, and the mango on your yogurt, so broccoli rarely flares you on its own. A reaction to a stir-fry heavy on broccoli stems might be the sum of the whole day, not the vegetable.

The only way to find your number is to watch this food against how you actually feel a few hours later, holding the portion steady and changing one thing at a time. That running total across a day is hard to keep in your head, which is the gap Bellyweather is built to close: log the meal from a photo and it tallies the fructose load with everything else you ate, so the total becomes a number you can point at. Treat what it surfaces as a lead to test, not a verdict.

• Eat whole broccoli or just the heads rather than a pile of trimmed stalks; the heads carry less excess fructose and stay low into bigger servings.
• Keep stalks to about half a cup if you eat them on their own, since they turn high past roughly 65g.
• Don't stack broccoli with other excess-fructose foods in one window: apple, mango, honey, and asparagus draw on the same fructose budget.
• Hold the portion fixed and change one thing at a time when you test, so you can read which move actually moved your gut.

Frequently asked questions

Sources

1. Monash University, FODMAP content of broccoli and Broccolini (excess fructose concentrated in the broccoli stalks; use heads if sensitive; avoid stalks alone over 65g; serving sizes).
2. Monash University, High and low FODMAP foods (the general food list; per-food serving sizes live in the Monash FODMAP app).
3. Monash University, The facts about glucose and fructose (why fructose in excess of glucose is poorly absorbed).
4. Varney J, Barrett J, Scarlata K, Catsos P, Gibson PR, Muir JG. FODMAPs: food composition, defining cutoff values and international application. J Gastroenterol Hepatol 2017;32:53-61.