Cornflakes

Grains · Breakfast Cereals

TLDRLast updated 6 October 2026

Cornflakes: the low FODMAP reference is 27 g. Weigh dry cornflakes: the 27 g low and 30 g moderate references are close together. US and gluten-free variants differ.

Serving sizes for cornflakes

Breakfast cereal, flakes of corn: 27 g low, 30 g moderate, 33 g high. Use the stated preparation and unit.

Low

27 gabout 0.9 cups

FructoseLow

LactoseLow

FructansLow

GOSLow

SorbitolLow

MannitolLow

Reference portions

Select an amount or rating to update your portion. These are reference portions, not exact cut-offs or recommended intakes.

Reference portions for Cornflakes and their FODMAP ratings
Serving	Amount	FODMAP rating
0.9 cups
1 cup
1.1 cups

Is cornflakes low FODMAP?

The references for breakfast cereal, flakes of corn are 27 g low, 30 g moderate, 33 g high. They are comparison portions, not exact transition cutoffs or personal tolerance limits.

Cornflakes and IBS: what to know

For cornflakes, keep the exact form and amount in mind. Check the complete ingredient list when comparing products. Gluten-free or similar front-of-pack wording is not a portion-specific FODMAP assessment. Monash: ingredient labels and FODMAPs. This public source supplies background, not verification of the numerical table.

Gut-friendly ways to eat cornflakes

Weigh dry cornflakes: the 27 g low and 30 g moderate references are close together. US and gluten-free variants differ. Compare Cornflakes (US Preparation), Corn Flakes (Gluten-Free). These guides describe their own preparations and portions.

Frequently asked questions

What is the FODMAP portion for cornflakes?

Cornflakes: 27 g low, 30 g moderate, 33 g high. These values apply to breakfast cereal, flakes of corn.

How should I measure or check cornflakes?

Weigh dry cornflakes: the 27 g low and 30 g moderate references are close together. US and gluten-free variants differ.

Which other guides are useful when comparing cornflakes?

Compare Cornflakes (US Preparation), Corn Flakes (Gluten-Free). These guides describe their own preparations and portions.

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Cornflakes (US Preparation)GrainsAvoid Corn Flakes (Gluten-Free)GrainsLow

Sources and editorial notes

Monash: ingredient labels and FODMAPs
Supports checking formulations and distinguishing gluten-free claims from low FODMAP; does not verify this product or its numerical portions.

Published and maintained by Gut Friendly. This guide has not been independently reviewed by a dietitian. Serving information comes from our food catalogue. Where references are listed, they explain the research and preparation differences. Check the original source for current portions.

Gut Friendly provides general information, not medical advice.