Cornflakes (US Preparation)

TLDRLast updated 3 October 2026

US cornflakes are low FODMAP at 16 g, approximately half a cup in the checked entry. Fructans are moderate at 19 g and high at 30 g. A full listed cup therefore has a different rating from the smaller low portion.

Serving sizes for cornflakes (us preparation)

The checked low amount is 16 g; 19 g is moderate and 30 g is high in fructans. Weigh dry flakes before adding milk.

Avoid
1 cupabout 30 g

Tested serving sizes

Tested serving sizes for Cornflakes (US Preparation) and their Gut Friendly rating
ServingAmountMain FODMAPRating
1 cup30 gFructans 0.3 gAvoid
16 g portion16 gFructans 0.01 gLow
19 g portion19 gFructans 0.1 gModerate

Breakdown for 1 cup

0gFructose
0gLactose
0.3gFructans
0gGOS
0gSorbitol
0gMannitol
1 cupabout 30 g

Is cornflakes (us preparation) low FODMAP?

All six groups are low at 16 g. Only fructans rise at the larger references, approximately two-thirds of a cup at 19 g and one cup at 30 g. Cup measures are rough descriptions of these tested amounts, not exact conversions. Gluten-free corn flakes have a separate checked formulation and portion.

Cornflakes (US Preparation) and IBS: what to know

For an IBS breakfast record, note the cereal amount before milk is added. Include the milk or yoghurt type and any fruit, nuts or sweeteners as separate parts of the meal. The US preparation's result does not establish a rating for every cornflake brand or a complete breakfast bowl.

Gut-friendly ways to eat cornflakes (us preparation)

Place an empty bowl on the scales and tare it before pouring the flakes. This keeps the dry cereal weight distinct from added liquid. If using crushed cornflakes in a coating, weigh them before crushing and divide the cereal used across the recipe's servings. Compare US rice crisp cereal using its own guide if you change breakfast cereal.

Frequently asked questions

Is a cup of US cornflakes low FODMAP?

The listed one-cup amount weighs 30 g and is high in fructans. The checked low amount is 16 g.

Why are the cup measures approximate?

Flake size, breakage and how a cup is filled affect volume. The listed gram weights are the clearer comparison.

Are gluten-free corn flakes covered by this result?

They have a separate entry and guide. Do not transfer either cereal's portion to the other formulation.

Does the rating include milk and fruit?

It describes the dry cereal. Milk, fruit and other additions need their own ingredient and portion assessment.

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Sources and editorial notes

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.