Breads & grains
Corn flakes
Highly processed corn with one of the highest cereal GIs.
- Glycemic index
- 81
- High GI
- Glycemic load
- 21
- High load
- Serving
- 1 cup
- 26 g carbohydrate
What this means
Corn flakes is high-GI, so on its own it can raise glucose quickly. That doesn't make it off-limits: the portion size (its glycemic load) and what you eat alongside it matter just as much as the index.
Glycemic index measures speed; glycemic load measures the impact of the amount you actually eat. The best read is your own: a post-meal reading shows how your body handled it.
Related foods
Compare side by side
GI is a rounded published reference and shifts with ripeness, processing, and the rest of your meal. General information, not medical advice.
See how foods land for you
A reference is a starting point. Your own numbers are the real story: log a reading after a meal, add a quick note, and SteadyRange shows you the patterns, on a private log you control.