Short answer
Yes — corn is Low FODMAP, but only in small portions. Monash University rates a ¼ cup (38 g) of canned, drained sweetcorn as Low FODMAP. Larger servings — or fresh corn on the cob — become high in sorbitol and fructans, two FODMAPs that commonly trigger IBS bloating and diarrhoea.
Monash portion chart
| Form of corn | Low FODMAP serving | High FODMAP at |
|---|---|---|
| Canned sweetcorn (drained) | ¼ cup (38 g) | ½ cup (75 g+) |
| Fresh corn on the cob | ½ cob (38 g kernels) | 1 full cob |
| Baby corn | 2 cobs (33 g) | 4 cobs |
| Popcorn (air-popped) | 7 cups (56 g) | — generous serve, generally safe |
| Cornflour / cornstarch | 2 tbsp | Generally safe in normal cooking amounts |
| Polenta (cooked) | 1 cup (255 g) | Generally well-tolerated |
| Corn tortilla | 2 small tortillas (62 g) | 3+ tortillas |
Source: Monash University FODMAP Diet App.
Why corn turns high FODMAP in larger portions
A small serve of corn contains trace amounts of sorbitol (a polyol) and fructans (a fermentable fibre). At ¼ cup canned corn these stay below Monash's symptom threshold. Double the serve and both FODMAPs cross the line — at the same time. This is called FODMAP stacking and it's a common reason people think they "can't tolerate" a food they actually can in normal portions. Read our full FODMAP Stacking Guide for examples.
Practical examples
- ✅ ¼ cup canned corn stirred through a salad — Low FODMAP
- ✅ 2 small corn tortillas for tacos — Low FODMAP
- ✅ A handful of air-popped popcorn as a snack — Low FODMAP
- ❌ A whole cob of corn at a BBQ — High FODMAP
- ❌ A cup of corn in a salad bowl — High FODMAP
Check any ingredient in seconds with our Low FODMAP Food Checker.
Best Low FODMAP swaps for high-corn dishes
| Skip | Use instead |
|---|---|
| Whole corn on the cob | ½ cob or a side of roasted low FODMAP vegetables |
| Big scoop of corn salsa | Diced tomato + green spring onion + lime |
| Creamed corn (often onion-based) | Homemade with lactose-free milk + 2 tbsp corn kernels |
What about corn syrup and HFCS?
High-fructose corn syrup (HFCS) is high FODMAP — it's the "excess fructose" category. Standard corn syrup (glucose-based) is generally tolerated in small amounts, but always check labels. Avoid HFCS-sweetened sodas, sauces, and breakfast cereals during the elimination phase.
FAQs
Is popcorn Low FODMAP? Yes — up to 7 cups air-popped per serve. Skip buttery, garlic, or onion-flavoured varieties.
Is corn tortilla Low FODMAP? Yes — 2 small (62 g) tortillas are Low FODMAP per Monash.
Is sweetcorn safe on elimination? Stick to ¼ cup canned, drained sweetcorn. Avoid whole cobs.
Is creamed corn Low FODMAP? Most store brands add onion or garlic. Make it at home with ¼ cup corn + lactose-free milk.
Bottom line
Corn is conditionally safe: ¼ cup of canned kernels, half a cob, 2 baby cobs, or 7 cups of popcorn fits the Low FODMAP diet. Larger portions stack sorbitol + fructans and may trigger symptoms.
For more "Is X Low FODMAP?" guides, browse our Low FODMAP Vegetables Guide with 32 vegetables and their safe portions.
Sources
- Monash University FODMAP Diet App — monashfodmap.com
- Monash blog: Vegetables and the Low FODMAP diet — monashfodmap.com/blog/vegetables-low-fodmap-diet
Medical disclaimer: This article is for informational purposes only and is not a substitute for personalised advice from a FODMAP-trained dietitian.
Practical Low FODMAP Takeaways for Is Corn Low FODMAP? Monash Portions, Safe Servings & Best Swaps
When using this guide, treat serving size as the most important detail. A food can be low FODMAP in one portion and become higher risk when the amount doubles or when it is combined with several similar ingredients in the same meal. For people with IBS, that cumulative effect is often the difference between a comfortable meal and symptoms later in the day.
A helpful approach is to pair this information with a simple food and symptom note. Write down what you ate, the portion, the time of day, stress level, and any symptoms over the next 24 hours. Patterns are usually more useful than one isolated reaction, especially because sleep, hormones, illness, caffeine, alcohol, and meal size can all affect digestion.
If you are in the elimination phase, keep meals simple and avoid testing several questionable foods at once. If you are in reintroduction, test one FODMAP group at a time with a structured serving ladder. That makes it easier to learn your personal tolerance instead of avoiding more foods than necessary.
For more planning support, use the FODMAP Food Checker before adding a new ingredient, the Ingredient Swap Finder when a recipe includes onion, garlic, wheat, lactose, or high-fructose sweeteners, and the Recipe Converter when you want to adapt a favorite meal. You can also browse low FODMAP recipes, breakfast ideas, dinner recipes, and IBS-friendly recipes to build a more varied weekly plan.
Medical disclaimer: This article is for general education only and is not a substitute for medical care. If you have ongoing digestive symptoms, unexplained weight loss, bleeding, fever, anemia, or severe pain, speak with a qualified healthcare professional. For personalized low FODMAP guidance, work with a registered dietitian familiar with IBS and FODMAP reintroduction.
