FODMAP food guide
Is instant oats low FODMAP?
FODMAP score
48
Moderate
In small portions — Instant Oats is moderate in FODMAPs. Portion size decides whether it triggers symptoms.
Low-FODMAP serving
1/4 cup dry (23 g)
Becomes high FODMAP at
3/4 cup dry (70 g) or more
Fine-cut and pre-cooked, so the safe serve is roughly half that of rolled oats; flavoured sachets often add honey or fruit on top.
Seen a different rating somewhere else?+
Usually it's a portion difference, not a disagreement. This page scores instant oats at a serving of 1/4 cup dry (23 g); at 3/4 cup dry (70 g) or more it belongs in the high band. A source quoting the larger serve will call it high, and one quoting the smaller will call it low — the same food, measured at two different amounts.
Based on published FODMAP research and reviewed reference data. Informational only — not medical advice. Tolerance is individual; verify with a dietitian during the elimination phase.
How much is OK?
This food's verdict depends on the serving. The bands below show where the load builds, group by group.
Fructans
Instant and quick oats are cut fine and pre-cooked, which concentrates their FODMAPs — the safe serve is roughly half that of rolled oats (rolled stay low to 1/2 cup, about 52 g dry). Weigh sachets: many single-serve packets run over 23 g, and flavoured versions often add honey or fruit.
GOS
GOS crosses into the moderate band at the same half-cup point as fructans, so the two rise together — stick to the quarter-cup dry measure and bulk the bowl out with a low-FODMAP milk or firm banana instead of more oats.
Bands reflect published FODMAP research for typical preparations — individual tolerance varies, especially mid-reintroduction.
Go deeper
Related foods — gentlest first
Green scores are the real swaps; matching numbers are just relatives, not alternatives.