Why overnight oats are great for IBS
Rolled oats are Low FODMAP up to ½ cup (45 g) uncooked per serve (Monash). Soaking them overnight softens the starch and makes them gentler on a sensitive gut — no cooking, no fuss.
Avoid instant oat sachets: most contain added inulin, dried apple, or honey, which are high in FODMAPs. New to portions? Use our Low FODMAP Food Checker before swapping anything in.
Step-by-step instructions
- Combine the base. In a 12-oz mason jar or bowl, add rolled oats, lactose-free milk, yogurt, chia seeds, maple syrup, vanilla, and cinnamon.
- Stir well so the chia seeds don't clump at the bottom.
- Refrigerate uncovered for 10 minutes, stir once more, then seal and chill overnight (or at least 4 hours).
- In the morning, stir, loosen with a splash of milk if too thick, and top with blueberries, strawberries, and chopped walnuts.
- Eat cold straight from the jar, or warm gently in the microwave for 45 seconds.
Serving size & FODMAP safety
One jar = 1 Low FODMAP serving. Stay inside these tested portions:
| Ingredient | Low FODMAP serve | Why it matters |
|---|---|---|
| Rolled oats | ½ cup (45 g) uncooked | Doubling pushes total fructans up |
| Lactose-free milk | 250 ml | Regular cow's milk = high lactose |
| Blueberries | ¼ cup (40 g) | ½ cup = moderate FODMAP |
| Strawberries | 10 medium (150 g) | One of the safest fruits |
| Walnuts | 30 g | Pecans (20 g) work too |
| Maple syrup | 2 tbsp | Avoid honey & agave |
For why doubling toppings can backfire, read our FODMAP Stacking Guide.
High → Low FODMAP swaps
| Skip (High FODMAP) | Use instead (Low FODMAP) |
|---|---|
| Cow's milk | Lactose-free milk or almond milk (≤250 ml) |
| Honey or agave | Pure maple syrup |
| Raisins / dried apple | Fresh blueberries or strawberries |
| Cashews / pistachios | Walnuts or pecans |
| Wheat-based granola | Toasted oats + pumpkin seeds |
| Greek yogurt | Lactose-free plain yogurt |
Flavor variations (still Low FODMAP)
- Peanut butter banana: add 1 tbsp natural peanut butter + ⅓ medium unripe banana.
- Chocolate strawberry: stir in 1 tsp cocoa + 2 tbsp dark chocolate chips, top with strawberries.
- Tropical: swap berries for ⅓ cup pineapple and 2 tbsp shredded coconut.
- Coffee: stir in 1 shot cooled espresso + extra cinnamon for a mocha twist.
Meal prep tips
- Batch 4 jars on Sunday — they keep 4 days in the fridge. Add fresh fruit & nuts the morning of.
- Use ½-pint mason jars so portions stay precise (no eyeballing).
- Need more breakfast ideas? Browse our Low FODMAP Breakfast Hub for 20+ tested recipes.
Common mistakes to avoid
- Using steel-cut oats — they stay hard overnight. Stick with rolled (old-fashioned) oats.
- Skipping the stir-after-10-min step — chia seeds clump and sink.
- Adding banana the night before — it browns. Slice fresh in the morning.
- Overdoing toppings — even Low FODMAP foods stack. Stick to the portions above.
Sources & further reading
- Monash University FODMAP Diet App — https://www.monashfodmap.com/
- Monash blog: Oats and the Low FODMAP diet — https://www.monashfodmap.com/blog/are-oats-low-fodmap/
Medical disclaimer: This recipe is for informational purposes only and is not a substitute for personalised advice from a FODMAP-trained dietitian.
