Breakfast
Blueberry Overnight Oats
10 minEasy
Blueberries
Fruits · Berries
TLDRLast updated 3 September 2026
Blueberries are low FODMAP at a quarter-cup serve, about 40 g, which is rated green. The catch is quantity: a full cup, about 150 g, is rated red, carrying 0.3 g of excess fructose, double the 0.15 g high threshold, plus 0.15 g of fructans. With blueberries, the measuring cup does the work.
Last updated 3 September 2026Serving sizes for blueberries
A quarter cup, about 40 g, is rated green. A full cup, about 150 g, is rated red.
0.25 cupsabout 40 g
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1/4 cup blueberries | 40 g | Fructans 0.04 g | |
| 1 cup blueberries | 150 g | Fructose 0.3 g |
Breakdown for 0.25 cups
0gFructose
0gLactose
0.04gFructans
0gGOS
0gSorbitol
0gMannitol
0.25 cupsabout 40 g
Is blueberries low FODMAP?
Blueberries are an amount story. At 40 g the only FODMAP group registered is fructans, at a tiny 0.04 g, so the serve is green. Scale up to a cup, 150 g, and excess fructose appears at 0.3 g, twice the 0.15 g threshold where a portion is rated high, while fructans climb to 0.15 g, into the moderate range. Two groups rising together is what pushes the bigger serve straight to red rather than amber.
Blueberries and IBS: what to know
The tricky part is that a quarter cup is a small handful, and blueberries are easy to pour freely over cereal or eat straight from the punnet. It is worth weighing 40 g once so your eye learns what the green serve looks like. If you are sensitive to excess fructose, the gap between the two tested serves matters more for you, since fructose is the group that surges as the portion grows. Spacing blueberry serves out across the day, rather than doubling up in one bowl, keeps you nearer the green point.
Gut-friendly ways to eat blueberries
Use blueberries as an accent rather than the bulk of the bowl: scatter a measured 40 g over porridge, then make up the volume with strawberries, which stay green at a much larger 140 g serve, or raspberries. Frozen blueberries are simple to portion straight from the bag. If it is blueberry flavour you are after, blueberry jam and a blueberry muffin both have their own entries in the guide.
Recipes with blueberries
Frequently asked questions
Are blueberries low FODMAP?
Yes, at the right portion. A quarter cup, about 40 g, is rated green with just 0.04 g of fructans and no excess fructose registered. A full cup, about 150 g, is rated red, so blueberries are low FODMAP only while the portion stays modest.
How many blueberries can I eat with IBS?
Stick close to the green serve: a quarter cup, about 40 g. Our data shows the next tested point, a full cup at 150 g, is rated red with 0.3 g of excess fructose and 0.15 g of fructans. Somewhere between those serves the portion stops being gut friendly, so the safe answer is to measure.
Why is a cup of blueberries high FODMAP?
Because of excess fructose. At 150 g, blueberries carry 0.3 g of it, double the 0.15 g threshold for a high rating, and their fructans reach 0.15 g at the same time. Neither shows up meaningfully at the 40 g serve, which is why the small portion stays green.
What berries can I eat more of than blueberries?
Strawberries are the standout: their green serve is 10 medium berries, about 140 g, more than three times the 40 g green serve of blueberries. Mixing a small measure of blueberries into a strawberry-based fruit salad gives you the flavour without leaning on the red-rated cup.
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