Erythritol offers clear advantages over sugar for blood sugar control, calorie reduction, and dental health. It contains just 0.2 calories per gram compared to sugar’s 4 calories per gram, and it has a glycemic index of zero versus sugar’s 65. But a 2023 study linking high blood levels of erythritol to cardiovascular risk has complicated the picture, making the answer less straightforward than it once seemed.
Calories and Sweetness
Erythritol delivers about 60 to 80% of the sweetness of table sugar while providing roughly 95% fewer calories. That gap matters if you’re using sweetener daily in coffee, baking, or processed foods. One teaspoon of sugar has about 16 calories; the same amount of erythritol has less than 1 calorie.
The sweetness difference means you may need slightly more erythritol to match sugar’s taste in recipes. It also doesn’t caramelize or brown the way sugar does, so baked goods can turn out paler and less crispy on top. For drinks, smoothies, and no-bake recipes, the swap is nearly seamless. For cookies or pastries where browning matters, many people blend erythritol with another sweetener to compensate.
Blood Sugar and Insulin
This is where erythritol pulls furthest ahead. Clinical studies in both lean and obese subjects, including people with diabetes, show that single doses of erythritol ranging from 20 to 75 grams produce no measurable change in blood glucose or insulin. Its insulinemic index is just 2 out of 100, meaning it triggers virtually no insulin response.
Erythritol also slows gastric emptying and triggers the release of gut hormones that regulate appetite and fullness. In a two-week trial, people with diabetes who consumed 20 grams of erythritol per day saw their HbA1c (a marker of average blood sugar over several months) drop from 8.5% to 7.5%. That’s a meaningful reduction, roughly equivalent to what some diabetes medications achieve.
Sugar, by contrast, spikes blood glucose rapidly. Its glycemic index of 65 places it in the moderate-to-high range, and repeated glucose spikes are a well-established driver of insulin resistance over time.
How Your Body Processes Erythritol
Unlike most sugar alcohols, erythritol is absorbed quickly in the small intestine, with about 90% entering the bloodstream. Here’s the key detail: your body doesn’t metabolize it. It circulates unchanged and gets filtered out through the kidneys into urine. The remaining 10% passes through the digestive tract, and lab studies show bacteria in the colon can’t ferment it either.
This unusual pathway explains both its near-zero calorie count and its digestive friendliness compared to other sugar alcohols like sorbitol or maltitol, which are poorly absorbed and fermented by gut bacteria, often causing gas, bloating, and diarrhea.
Digestive Tolerance
Erythritol is the best-tolerated sugar alcohol, largely because of that 90% absorption rate. Most adults can handle 20 to 35 grams in a single sitting without digestive issues. For context, that’s roughly 4 to 7 teaspoons. At very high doses (above 50 grams at once), some people experience nausea or stomach rumbling, but the laxative effects common with other sugar alcohols are far less likely with erythritol.
If you’re new to it, starting with smaller amounts and increasing gradually is a practical approach. People who consume erythritol regularly tend to tolerate higher amounts over time.
Dental Health
Sugar feeds the bacteria in your mouth that produce acid and erode enamel. Erythritol does the opposite. Lab research shows it actively inhibits biofilm formation by the main cavity-causing bacterium, Streptococcus mutans. It reduces both the number of viable bacterial cells and the sticky polysaccharide matrix that helps plaque cling to teeth. This effect is comparable to xylitol, the sugar alcohol most widely recognized for dental benefits.
Antioxidant Activity
Erythritol has a lesser-known property: it scavenges hydroxyl radicals, one of the most damaging types of free radicals in the body. Its chemical structure is similar to mannitol, a compound used medically as an antioxidant. Research published in the journal Free Radical Biology and Medicine found that erythritol effectively neutralized hydroxyl radicals and protected red blood cells from oxidative damage in lab conditions. The researchers concluded it may help protect blood vessels from the damage caused by chronically high blood sugar, though this benefit is still being studied in real-world settings.
The Cardiovascular Concern
In 2023, a study funded by the National Institutes of Health found that people with the highest blood levels of erythritol were about twice as likely to experience a heart attack or stroke over three years compared to those with the lowest levels. Lab work from the same research team showed that erythritol appeared to make blood platelets more reactive, potentially increasing clot formation.
This finding deserves context. The study measured blood levels of erythritol, not dietary intake directly. Your body actually produces small amounts of erythritol naturally through a metabolic pathway, and elevated levels could be a marker of metabolic dysfunction rather than a direct cause of cardiovascular events. The participants also had existing risk factors for heart disease, so it’s unclear whether these results apply to healthy people.
Still, the findings are significant enough that people with existing heart disease or clotting disorders should pay attention as more research clarifies the relationship.
Regulatory Status
Erythritol holds Generally Recognized as Safe (GRAS) status with the FDA, meaning qualified experts have reviewed publicly available evidence and determined it safe for its intended use. Unlike the five FDA-approved high-intensity sweeteners (such as aspartame and sucralose), erythritol doesn’t have a formally established acceptable daily intake limit. No major regulatory body has set a specific ceiling on daily consumption, which reflects both its long safety record and the fact that it’s classified as a sugar alcohol rather than a high-intensity sweetener.
Where Erythritol Wins and Where It Doesn’t
For blood sugar management, calorie reduction, and protecting your teeth, erythritol is a clear upgrade over sugar. It’s especially useful for people with diabetes or anyone actively trying to reduce calorie intake without giving up sweetness. Its digestive tolerance is far better than other sugar alcohols, and it has the added bonus of antioxidant activity.
Where it falls short: it’s less sweet than sugar, it won’t caramelize, and the 2023 cardiovascular findings remain unresolved. It’s also more expensive than sugar, typically costing three to five times as much per pound. And while it’s effective as a partial replacement, using it as your sole sweetener in baking often requires recipe adjustments to account for differences in texture, moisture, and browning.
For most people looking to cut sugar intake, erythritol remains one of the better-studied and better-tolerated alternatives available. The cardiovascular question is worth watching, but the current weight of evidence still favors erythritol over sugar for metabolic health.