Since keto means very little sugar, low-carb sweeteners let you keep a sweet taste without the carbs. Most don't raise blood sugar, which is why they're popular on keto and with diabetes. But they're not all equal, and there's some recent research worth knowing.

Commonly used keto sweeteners

  • Stevia — from a plant, no calories, doesn't raise blood sugar.
  • Monk fruit — plant-based, very sweet, no blood-sugar spike (Cleveland Clinic).
  • Erythritol and xylitol — sugar alcohols; low-calorie and don't spike blood sugar, but see the caution below.
  • Allulose — a rare sugar that tastes like sugar with minimal blood-sugar impact.
  • Sucralose, aspartame — artificial sweeteners with no carbs.

A few practical notes

  • Sugar alcohols can upset your stomach. Eating a lot of erythritol or xylitol can cause bloating or diarrhea.
  • Sugar alcohols count for less — but not zero. Some are partly absorbed and do affect blood sugar (net carbs vs total carbs).
  • Xylitol is toxic to dogs — keep it away from pets.

An honest safety note on erythritol

Erythritol is one of the most common keto sweeteners — and it's hidden inside many "natural" stevia and monk-fruit blends. In 2023, a Cleveland Clinic study published in Nature Medicine found that higher blood levels of erythritol were associated with a higher risk of heart attack and stroke, especially in people who already had heart disease or its risk factors (Cleveland Clinic). A later study found a similar signal for xylitol.

What this does and doesn't mean: these were observational studies — they show an association, not proof that the sweetener causes the events, and more research is needed (Cleveland Clinic). It's not a reason to panic. But it is a reason to use these sweeteners in moderation, and — if you have heart disease or risk factors for it — to talk to your doctor before using erythritol or xylitol regularly. Stevia, monk fruit (check that they're not blended with erythritol), and allulose are alternatives.

The simplest option of all: over a few weeks on keto, many people find their taste for sweetness fades, and they need less of anything.

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