Key findings
- 1Kellogg's original 1894 Corn Flakes were hand-rolled boiled corn, and the modern extruded product bears little resemblance to the original invention
- 2Degermination removes the corn germ (which contains the fiber, vitamins, and oil), leaving a starchy base that requires synthetic re-fortification
- 3Although branded as a simple, classic cereal, modern Corn Flakes undergo more industrial processing steps than most consumers realize
Why is Corn Flakes Level 3 on average?
The original Corn Flakes were hand-rolled from boiled corn, a simple mechanical process. Today's manufacturing is entirely different: corn is degerminated (removing fiber and fat), milled into grits, cooked in a pressurized steam vessel with sugar, malt flavoring, and salt, then extruded, flattened by industrial rollers, and toasted in gas-fired ovens. The enrichment with iron, niacin, and B vitamins is necessary specifically because the degermination and high-heat extrusion destroy the nutrients naturally present in whole corn. BHT is added as a synthetic preservative. The transformation from Kellogg's 1894 hand-rolled recipe to the modern industrial process illustrates how industrialization transformed a simple food. In our analysis, corn flakes average a Processing Score of 5.8, which is Level 3.
How 247 corn flakes products break down
Share of products at each processing level, in our analysis.
Corn Flakes brand comparison
From least to most processed in our database.
How to read a corn flakes label
- 1
BHT "for freshness" is a synthetic antioxidant preservative added to the packaging
- 2
The corn has been degerminated, the most nutritious part of the kernel is removed before processing begins
- 3
Enriched vitamins are replacements for naturally occurring nutrients destroyed by processing
- 4
Sugar and malt flavoring are cooked into the grits, not just surface-coated
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Frequently asked questions
Are Corn Flakes a healthy breakfast?
Corn Flakes are low in sugar (4g per serving) compared to frosted cereals, but they are built on extruded, degerminated corn. In our analysis, corn flakes average Level 3. Plain oatmeal and plain muesli are far less processed.
Were Corn Flakes originally less processed?
Yes. John Harvey Kellogg's 1894 recipe involved boiling corn and hand-rolling it into flakes: a simple mechanical process. Modern Corn Flakes are produced through industrial degermination, pressurized cooking, extrusion, and synthetic fortification.
Why are Corn Flakes fortified with so many vitamins?
The degermination process removes the nutrient-dense germ, and high-heat extrusion destroys heat-sensitive vitamins. The synthetic fortification (iron, niacin, B6, folic acid) replaces what the industrial process removed from the original corn.
Guide · Breakfast
The Complete Breakfast Guide
Processing analysis, least-processed picks, and what to watch for.
Read guide