Cornstarch is not keto-friendly. With ~91g net carbs per 100g, it's almost pure starch with no redeeming nutritional value for keto. Even 1 tablespoon (8g) provides 7g net carbs. Use keto-friendly thickeners like xanthan gum or glucomannan instead.
Is Cornstarch Keto?

Cornstarch is not keto-friendly. With ~91g net carbs per 100g, it's almost pure starch with no redeeming nutritional value for keto. Even 1 tablespoon (8g) provides 7g net carbs. Use keto-friendly thickeners like xanthan gum or glucomannan instead.
- Net carbs (100g)91g
- Protein (100g)0.3g
- Fat (100g)0.1g
- Keto verdictNot keto
NUTRITION FACTS
Per 100g (raw)
Source: Nutritional databases and food labels
HEALTH BENEFITS
- Provides texture and thickness in cooking (non-keto contexts)
- Gluten-free thickening option for celiac disease
- Shelf-stable and inexpensive
- Flavorless—doesn't alter taste of dishes
PREPARATION SUGGESTIONS
NOT FOR KETO USE
Cornstarch is incompatible with ketogenic diets. Do not use in keto cooking or baking.
KETO ALTERNATIVE: XANTHAN GUM
Use 1/4–1/2 tsp xanthan gum per cup of liquid to thicken sauces, gravies, and soups with <1g net carbs.
KETO ALTERNATIVE: GLUCOMANNAN
Start with 1/8 tsp glucomannan powder per cup liquid; it's very powerful. Let sit to thicken fully.
KETO ALTERNATIVE: GUAR GUM
Similar to xanthan gum; use sparingly (1/4–1/2 tsp per cup) to thicken without carbs.
KETO ALTERNATIVE: REDUCTION
Simmer sauces longer to evaporate water and naturally thicken without any thickener.
KETO ALTERNATIVE: CREAM/CHEESE
Add heavy cream, cream cheese, or grated hard cheese to thicken and add richness.