No single sweetener wins the title of “healthiest” across every measure, but stevia and monk fruit consistently come closest. Both have a glycemic index of zero, add no calories, and show no negative effects on blood sugar in human trials. Beyond that, the best choice depends on what matters most to you: blood sugar control, gut health, dental protection, or everyday cooking flexibility.
Stevia and Monk Fruit: The Strongest Overall Options
Stevia and monk fruit are plant-derived sweeteners that have been used for centuries and now dominate the “natural zero-calorie” category. Stevia gets its sweetness from compounds called steviol glycosides, while monk fruit relies on mogrosides. Both are intensely sweet, hundreds of times sweeter than table sugar, so a tiny amount goes a long way.
In a crossover study with ten participants, monk fruit extract had no impact on blood sugar levels, while the same amount of sucrose caused a 70% spike shortly after ingestion. Animal research has also shown monk fruit may improve insulin sensitivity and raise beneficial HDL cholesterol. Stevia performs similarly: clinical trials in people with diabetes found that stevia-sweetened tea did not affect blood glucose, insulin, or lipid levels. Animal studies suggest steviol glycosides may actively help prevent high-fat-diet-induced blood sugar problems, though that hasn’t been confirmed in large human trials yet.
If you’re choosing between the two, the practical differences matter more than the health differences. Stevia can have a bitter or licorice-like aftertaste that some people notice, especially at higher concentrations. Monk fruit tends to taste cleaner but costs more. For baking, stevia stays stable up to about 400°F before it starts breaking down, while granulated monk fruit blends work well in most baked goods. Neither substitutes cup-for-cup for sugar, though. You’ll need significantly less of either one, and recipes often require some trial and error.
Allulose: A Newer Option Worth Knowing
Allulose is a rare sugar found naturally in small amounts in figs, raisins, and maple syrup. It tastes and behaves like regular sugar (it browns, dissolves, and has about 70% of sugar’s sweetness) but your body absorbs almost none of it. It contains roughly 0.2 calories per gram, a 95% calorie reduction compared to table sugar.
What makes allulose particularly interesting is that it doesn’t just avoid raising blood sugar. It may actually lower it. In a prospective, randomized crossover study published in BMJ Open Diabetes Research & Care, adding 7.5 to 10 grams of allulose to 50 grams of sugar significantly reduced blood glucose at 30 minutes compared to a placebo. The effect was dose-dependent: the more allulose, the greater the reduction. This makes allulose one of the few sweeteners that can blunt the blood sugar impact of other sugars eaten alongside it.
The main downsides are cost and availability. Allulose is newer to the market, more expensive than stevia or monk fruit, and not yet approved as a food ingredient in every country (the EU, for instance, hasn’t approved it as of mid-2025).
Xylitol: Best for Dental Health
If tooth protection is your priority, xylitol stands apart. It’s a sugar alcohol found naturally in birch bark and some fruits, and it has a unique trick: oral bacteria can’t metabolize it. When cavity-causing bacteria try to feed on xylitol, they essentially starve. This reduces both bacterial counts and the acid production that erodes enamel. The American Academy of Pediatric Dentistry notes that consistent xylitol use (5 to 10 grams spread across three to five doses per day) can reduce cavities by 30 to 80 percent.
Xylitol does contain about 2.4 calories per gram, roughly 40% less than sugar, and it has a modest effect on blood sugar. It’s not zero-calorie or zero-glycemic like stevia. It also causes digestive discomfort in some people, particularly bloating or diarrhea at higher doses, as the body adapts. One important safety note: xylitol is extremely toxic to dogs, even in small amounts.
Erythritol: Convenient but Uncertain
Erythritol is another sugar alcohol, but unlike xylitol it has essentially zero calories and doesn’t spike blood sugar. It substitutes cup-for-cup in many recipes and has a clean taste, which made it one of the most popular “healthy” sweetener choices in recent years. It’s the primary ingredient in brands like Swerve.
That popularity hit a snag in 2023 when researchers at the Cleveland Clinic found that higher fasting blood levels of erythritol were associated with increased risk of major cardiovascular events, including heart attack, stroke, and death, independent of traditional risk factors. A follow-up study published in Arteriosclerosis, Thrombosis, and Vascular Biology found that ingesting a typical quantity of erythritol enhanced platelet reactivity in healthy volunteers, meaning it made blood cells more likely to clump together and form clots. Glucose, by comparison, did not have this effect.
This research is still early and doesn’t prove erythritol causes heart attacks. But it’s enough to give pause, especially if you have existing cardiovascular risk factors or consume erythritol daily in large amounts.
Honey and Maple Syrup: Real Sugars With a Nutrient Edge
Honey and maple syrup are still sugars. They raise blood glucose, contain significant calories, and contribute to the same metabolic problems as table sugar when consumed in excess. But they’re not nutritionally identical to white sugar, either.
Maple syrup delivers meaningful amounts of manganese (0.6 mg per tablespoon, about 26% of daily needs) and zinc (0.3 mg per tablespoon). It also contains phenolic compounds with anti-inflammatory properties. Honey offers smaller amounts of those minerals but brings its own mix of flavonoids and antioxidants, particularly raw, unprocessed varieties. Both contain amino acids that refined sugar completely lacks.
If you’re going to use a caloric sweetener, honey or maple syrup are better choices than white sugar or high-fructose corn syrup. But they’re not in the same health category as stevia, monk fruit, or allulose. Think of them as the least harmful version of real sugar, not a health food.
Artificial Sweeteners: What the Evidence Shows
Sucralose, aspartame, and saccharin remain widely used and are generally recognized as safe by food regulators. But the picture has gotten more complicated.
In 2023, the International Agency for Research on Cancer classified aspartame as “possibly carcinogenic to humans” (Group 2B), the same category as aloe vera and pickled vegetables. The WHO’s Joint Expert Committee on Food Additives reviewed the same evidence and kept aspartame’s acceptable daily intake at 40 mg per kilogram of body weight, concluding there wasn’t enough reason to change it. For a 150-pound person, that’s roughly 12 to 14 cans of diet soda per day. Most people never come close.
The gut health question is more concerning for everyday use. A 2026 review in Cell’s Trends in Microbiology found that artificial sweeteners alter the gut microbiome to varying degrees, with saccharin having the most pronounced effect. These changes to gut bacteria have been linked to impaired glucose tolerance, reduced insulin sensitivity, and increased inflammation in both human and animal studies. Sucralose also shifted bacterial populations in the gut, increasing some species and decreasing others, including beneficial ones. Aspartame’s effects were present but less dramatic.
The WHO’s 2023 guideline made a broader recommendation: non-sugar sweeteners should not be used as a strategy for long-term weight control. Their review found that replacing sugar with these sweeteners doesn’t help with weight management over time, possibly because they maintain a preference for sweet tastes that drives overall calorie consumption through other foods.
How to Choose Based on Your Priorities
- Blood sugar control: Stevia, monk fruit, or allulose. All three have zero or near-zero glycemic impact, and allulose can actively reduce blood sugar spikes from other foods.
- Baking and cooking: Allulose behaves most like real sugar. Sucralose and erythritol-based blends (like Swerve) substitute cup-for-cup. Stevia and monk fruit require recipe adjustments.
- Tooth protection: Xylitol, used consistently at 5 to 10 grams per day in gum or mints after meals.
- Gut health: Stevia and monk fruit have the least evidence of microbiome disruption. Saccharin and sucralose have the most.
- Cardiovascular caution: Avoid heavy daily erythritol use until more research clarifies the clotting findings.
For most people, stevia or monk fruit offers the best combination of safety, zero calories, and no meaningful metabolic downsides. Adding allulose to your kitchen for baking or sweetening drinks gives you a practical option that handles heat and tastes like sugar without the metabolic cost. No sweetener is perfect, but these three have the cleanest track records across the widest range of health concerns.