Is erythritol safe for keto or low-carb diets?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Erythritol is a sugar alcohol widely regarded as safe for keto and low-carb diets because it does not raise blood sugar or insulin levels. With nearly zero calories and a glycemic index of zero, it is absorbed by the body but not metabolized for energy, making it a popular sugar substitute for people managing diabetes, insulin resistance, or ketogenic goals.

However, individual reactions to sweeteners and blood sugar responses can vary, and symptoms like bloating, fatigue, or sugar cravings may signal something deeper going on with your metabolism or gut health. If you're unsure whether erythritol or another factor is affecting how you feel, take a free, instant, online symptom check to better understand your body's signals and confidently navigate your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Erythritol is a sugar substitute that is often used in keto and low-carb diets. It is a type of sugar alcohol, which means it provides sweetness without adding many calories or affecting blood sugar levels. This makes it a popular choice for people who want to reduce their sugar intake while maintaining a sweet taste in their foods.

Why Erythritol is Safe:

Blood Sugar: Erythritol does not cause spikes in blood sugar, making it safe for people on low-carb diets.
Calories: It has almost no calories, so it won't add to your daily calorie intake.
Dental Health: Unlike sugar, erythritol does not contribute to tooth decay.

Considerations:

Digestive Issues: Some people might experience digestive discomfort if they consume large amounts of erythritol. If you're experiencing persistent digestive symptoms or other health concerns, you can use our free AI symptom checker to help identify what might be causing your discomfort.
Taste: Erythritol can have a cooling effect in the mouth, which some people might find unusual.

In summary, erythritol is a safe and effective sweetener for those on keto or low-carb diets, but it's always good to try it in small amounts first to see how your body reacts.

(References)

Mazi TA, & Stanhope KL. (2023). Erythritol: An In-Depth Discussion of Its Potential to Be .... Nutrients, 36615861.

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