FODMAP checker
Rolled Oats
Why are oats portion-dependent for FODMAP?
Oats contain fructans — the same type of FODMAP as garlic and wheat. Unlike wheat, however, the fructan content in oats is moderate enough that a small portion falls below the FODMAP threshold.
Monash University certifies ½ cup (52g) dry rolled oats as low FODMAP. A full cup (100g+) portion is high FODMAP. Instant oats (quick oats) have a similar FODMAP content to rolled oats at the same weight.
Note: oats are naturally gluten-free but are often processed in facilities that also handle wheat, so cross-contamination is common. If you have coeliac disease (not just IBS), use certified gluten-free oats.
Tips & alternatives
- ⚖️Weigh 52g dryDon't estimate — 52g dry oats is less than most people expect. Use a kitchen scale until you have a feel for the portion.
- 🍚Rice porridge as an alternativeRice cooked with lactose-free milk or water and topped with banana and maple syrup makes a great low-FODMAP alternative to oat porridge.
- 🌽Polenta porridgePolenta (cornmeal) cooked as porridge is completely low FODMAP and works well as an oat alternative.
Frequently asked questions
Are overnight oats low FODMAP?
Yes, if you use the correct portion (52g dry oats) and low-FODMAP milk alternatives. Mix with lactose-free milk or rice milk, top with blueberries and a drizzle of maple syrup.
Are oat biscuits low FODMAP?
Most commercial oat biscuits are not low FODMAP — they contain wheat and often honey. Homemade oat biscuits using gluten-free oats, rice flour, and maple syrup can be made low FODMAP.
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