Is avocado high FODMAP?

The polyol everyone calls sorbitol, that isn't

For years avocado was filed under sorbitol, the same polyol in stone fruit and mushrooms. When Monash retested it in 2024, the peak in their data matched perseitol, a sugar alcohol that is more or less unique to avocado. They updated the rating, and the low FODMAP serving grew from 30g to 60g. The food didn't change. The measurement did.

Perseitol works the way the other polyols do, just heavier. It is a larger molecule than sorbitol, and the bigger a polyol is, the less of it your small intestine can absorb. What stays behind draws water into the gut like a sponge, and whatever isn't absorbed travels on to the colon, where bacteria ferment it into gas. Water plus gas stretches the bowel wall. A sensitive gut reads that stretch as bloating or cramp.

That is why the answer is a serving size, not a yes or no. A few tablespoons keep the perseitol dose under most people's line. Half an avocado on toast pushes past it.

Why an unripe avocado may hit harder than a ripe one

The 60g cutoff is a population threshold, set conservatively so most people stay under their own. Yours is set by your gut, your transit speed, and how the rest of your day stacked up, and it drifts with stress and sleep. One detail makes avocado trickier than the chart suggests: Monash found unripe fruit carries more perseitol than ripe, because the polyol falls off as the avocado softens. So the same 60g from a hard, early avocado can land differently than from a buttery ripe one.

The only way to find your real line is to hold the portion steady and watch what your gut does, the same scoop on a calm day and a frazzled one, ripe and barely-ripe. The sum across a day is the thing memory quietly drops. Bellyweather tallies the FODMAP load from a photo, so the avocado, the onion, and the apple show up as one number you can point at, a lead to test rather than a verdict.

• Keep avocado to about 60g, a third of a medium fruit or three tablespoons, to stay in the green.
• Let it ripen fully before eating; softer fruit carries less perseitol than hard, unripe avocado.
• Watch for polyol stacking: avocado plus mushrooms, blackberries, or stone fruit in one meal adds the same family of polyols together.
• Log the portion and how you felt a few hours later, so you learn your own line instead of guessing from the chart.

Frequently asked questions

Sources

1. Monash University — Avocado and FODMAPs: a smashing new discovery (perseitol identified, serving size updated to 60g, 2024)
2. Varney et al. — FODMAPs: food composition, defining cutoff values and international application. J Gastroenterol Hepatol (2017)
3. Monash University — About FODMAPs and IBS (polyols, serving sizes, traffic-light system)