Blackberries
Fruits · Berries
You can count the low FODMAP serve of blackberries on one hand: five or six berries, about 40 g, is the green portion. A cup, 150 g, is rated red, with excess fructose at 0.2 g and fructans at 0.15 g. Sorbitol registers even at the green serve, which is unusual for a berry.
Last updated 3 September 2026Serving sizes for blackberries
Five or six blackberries (40 g) is the green serve; one cup (150 g) is rated red.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 5-6 blackberries | 40 g | Fructans 0.04 g | |
| 1 cup blackberries | 150 g | Fructose 0.2 g |
Breakdown for 5 blackberries
Is blackberries low FODMAP?
Three groups appear, but only one drives the rating. At a cup, excess fructose reaches 0.2 g, past the 0.15 g line where a portion counts as high, and that on its own is enough for red. Fructans add 0.15 g in the moderate band. Sorbitol stays low throughout, 0.02 g at the small serve and 0.08 g at a cup, under its own 0.2 g mark, so it feeds a day’s polyol total without being the culprit. Raspberries never cross a high line at any tested amount, which is why the same cup rates amber there and red here.
Blackberries and IBS: what to know
Five or six berries is a garnish, and blackberries are not usually sold or eaten that way. A supermarket punnet holds several green serves, a handful off a bramble is past one before you have thought about it, and frozen mixed berry blends put blackberries into smoothies by the cupful. The polyol point matters more across a day than within one serve: if lunch already included avocado or a stone fruit, the sorbitol in an evening bowl lands on top of something. Cooking into a crumble concentrates the fruit rather than softening its effect.
Gut-friendly ways to eat blackberries
Treat blackberries as the dark note in a bowl rather than the bowl itself: a few halved over porridge, a few pressed into the top of a crumble built mostly from strawberries, which stay green at 140 g. Where you want the same tart edge with more volume, raspberries hold green at half a cup and only reach amber at a full one. Frozen blackberries make a small serve manageable, since counting six out of a bag is easier than deciding when to stop with an open punnet.
Frequently asked questions
How many blackberries can I eat with IBS?
Five or six, about 40 g, is the green serve. The next tested point is a full cup at 150 g and it is rated red, with nothing measured in between, so a small bowlful is unmapped rather than quietly fine. Counting the berries out is easier than weighing them, which is the one advantage of a serve this small.
Why are blackberries higher FODMAP than raspberries?
Excess fructose is the difference. At a cup, blackberries carry enough of it to cross the high threshold, while raspberries at the same cup stay in the moderate band. Blackberries also bring a little sorbitol, which raspberries do not carry at all, so they add to your polyol total as well as your fructose one.
Are frozen blackberries or blackberry jam low FODMAP?
Freezing leaves the figures alone, so frozen berries follow the fresh serve and are easy to count out. Jam is a separate question, since fruit is diluted with sugar and the answer turns on the spoonful and the recipe, so use the jam entry rather than the fruit one. Berry-heavy smoothie blends are the sneakiest form, because a cup goes in without ceremony.
Can I eat wild blackberries picked from a bramble?
They are the same fruit, but the setting works against you: picking and eating happen by the handful, and nobody stops at six. If you are out picking, put the berries in a tub and portion them at home. Wild berries also vary a lot in size, so counting five or six large ones is a rougher measure than it sounds.
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