Cornstarch
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Cornstarch is keto only in small portions: it has ~6 g of net carbs per 1 tablespoon, against the keto diet's 5 g-per-serving limit.
Net carbs
6 g
per 1 tablespoon
These are the carbs that count on keto: total carbs minus fiber.
One tablespoon has about 6.9 g net carbs, and amounts add up quickly since it's a concentrated thickener with a high glycemic index.
Nutrition facts for cornstarch
Why cornstarch is keto only in small portions?
On keto the goal is to stay under ~5 g of net carbs per serving; cornstarch has 6 g per 1 tablespoon (7 g total − 0 g of fiber).
How much cornstarch can I eat on keto?
To stay under 5 g of net carbs, the limit is ~6 g of cornstarch.
Related
Reviewed by the Ketorai team · Last updated: July 2, 2026 · How we assign the verdict
For information only. This does not replace advice from a health professional.
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