FODMAP food guide
Is oat milk low FODMAP?
FODMAP score
35
Moderate
In small portions — Oat Milk is moderate in FODMAPs. Portion size decides whether it triggers symptoms.
Low-FODMAP serving
scant 1/2 cup (100 ml)
Becomes high FODMAP at
beyond 1/2 cup (125 ml)
Oats contribute fructans/GOS; a splash is fine but a full glass can be moderate-to-high.
Seen a different rating somewhere else?+
Usually it's a portion difference, not a disagreement. This page scores oat milk at a serving of scant 1/2 cup (100 ml); at 1/2 cup (125 ml) 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
Roughly 100 ml is the tested low serve — enough to splash in coffee or porridge, not enough to pour over a full bowl of cereal. A full cup (250 ml) is high.
GOS
GOS rises in step with the fructans in the same pour, so the two share a boundary. Brands vary — UK-style oat drinks test low at a larger 1/2 cup (125 ml) serve, while versions with added oat fibre or chicory root cross the line sooner.
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.