Stevia and monk fruit are the two best natural sweetener options for people with diabetes, as both have virtually no effect on blood sugar or insulin levels. But several other options exist on a spectrum, and the best choice depends on how you plan to use it. Here’s what the evidence says about each one.
Stevia: The Most Studied Option
Stevia comes from the leaves of a South American plant and is roughly 200 to 300 times sweeter than table sugar. It has a low glycemic impact, meaning it produces little to no rise in blood sugar after consumption. In a randomized controlled trial of people with type 2 diabetes, stevia-sweetened tea caused no significant changes in fasting blood sugar, insulin levels, or HbA1C (a marker of long-term blood sugar control) compared to baseline.
The plant’s active compound works by opening calcium channels in the insulin-producing cells of the pancreas, which helps stimulate insulin release in response to glucose. Animal research also suggests stevia may improve insulin sensitivity over time. One 12-week study in animals found that daily stevia intake significantly decreased both blood glucose and insulin levels compared to a placebo, without affecting body weight.
The tradeoff is taste. Stevia can have a bitter or licorice-like aftertaste, especially at higher concentrations. Pure stevia extract is extremely potent: you only need about 3/4 teaspoon to replace a full cup of sugar. That intensity makes it tricky in baking, where sugar provides not just sweetness but also bulk and moisture. Liquid stevia drops work well in coffee, tea, and smoothies, where the small volume isn’t an issue.
Monk Fruit: Zero Glucose Response
Monk fruit sweetener is extracted from a small melon native to southern China. Its sweetness comes from compounds called mogrosides, which the human body does not recognize as carbohydrates or sugars. Because of this, monk fruit does not trigger an insulin response at all.
Animal research shows promising results for blood sugar management. In one rat study, consuming monk fruit extract before a meal significantly suppressed the post-meal rise in blood glucose. The mechanism appears to involve blocking an enzyme in the small intestine that breaks down certain sugars, slowing their absorption. Another study found that the key compound in monk fruit improved blood sugar levels, increased the body’s ability to store glucose properly, and reduced insulin resistance in diabetic rats. Clinical trials in humans are still limited, but the existing evidence is encouraging.
For practical use, monk fruit blends (typically mixed with erythritol or allulose) convert 1:1 with sugar, making them the easiest direct swap in recipes. Pure monk fruit extract is concentrated like stevia, needing only about 2/3 teaspoon per cup of sugar, so most people find the blends far more convenient.
Allulose: Tastes Like Sugar, Acts Like Fiber
Allulose is a rare sugar found naturally in small amounts in figs, raisins, and maple syrup. It tastes and behaves remarkably like regular sugar, browning in the oven and dissolving smoothly in liquids. The key difference: your body absorbs allulose but doesn’t significantly metabolize it. It contributes minimal calories (roughly 0.2 to 0.4 calories per gram, compared to 4 calories per gram for table sugar) and has a negligible effect on blood glucose and insulin levels.
A meta-analysis of clinical trials in people with type 2 diabetes confirmed that allulose does not meaningfully raise blood sugar. This makes it one of the most practical options for baking and cooking, since it provides the bulk, texture, and browning that stevia and monk fruit lack on their own. The downside is cost. Allulose is more expensive than most sweeteners, and in large amounts (typically over 30 to 50 grams at once), it can cause mild digestive discomfort like bloating.
Erythritol: Effective but Worth Watching
Erythritol is a sugar alcohol found naturally in some fruits and fermented foods. It contains about 0.2 calories per gram and does not raise blood sugar. In terms of digestive tolerance, it performs better than other sugar alcohols like xylitol. Healthy adults can consume 20 to 35 grams of erythritol without any significant digestive symptoms. Even at 50 grams (a large single dose), the only notable side effects were mild nausea and stomach rumbling. By comparison, 35 grams of xylitol caused significant bloating, cramping, and watery stools in the same study.
However, erythritol has drawn concern for a different reason. Research published through NIH found that higher blood levels of erythritol were associated with increased risk of heart attack, stroke, and cardiovascular death. This doesn’t prove erythritol causes these events, as the relationship could reflect other factors. But it’s worth noting, especially if you have existing heart disease risk factors. If you use erythritol, moderate intake is a reasonable approach until more is known.
Coconut Sugar: Better Than Table Sugar, Still Not Great
Coconut sugar is often marketed as a natural, healthier alternative to refined sugar. It does have a lower glycemic index, ranging from 35 to 54 depending on the study, compared to about 65 for regular table sugar. It also contains some antioxidant compounds and has relatively low fructose content (roughly 3 to 5%). But it’s still mostly sucrose, with sucrose making up 50 to 90% of its composition depending on processing methods.
For someone managing diabetes, coconut sugar will still raise your blood sugar. It just does so somewhat more slowly than white sugar. It is not a free pass, and it should be counted as a carbohydrate in meal planning just like any other sugar. If you’re looking for something that genuinely won’t spike your glucose, the options above are far better choices.
Yacon Syrup: A Prebiotic Alternative
Yacon syrup is less well known but deserves attention. It comes from the root of a South American plant and is rich in fructooligosaccharides, a type of fiber that your body can’t fully digest. These fibers pass to the colon, where they feed beneficial gut bacteria like bifidobacteria and lactobacilli.
In studies of obese women, daily yacon syrup consumption over 120 days cut fasting insulin levels nearly in half (from 12.6 to 7.3 mU/mL) and dramatically improved insulin resistance scores. Participants also lost weight, reduced their waist circumference, and lowered LDL cholesterol. The insulin-sensitizing effect appears to depend partly on your existing gut bacteria profile, with people who have higher levels of certain beneficial bacteria responding better.
Yacon syrup has a mild, molasses-like flavor and works well drizzled over oatmeal or yogurt. It’s not a zero-calorie sweetener, so it won’t replace stevia or monk fruit for everyday use, but its combined benefits for insulin sensitivity and gut health make it a useful addition.
How to Choose the Right One
The American Diabetes Association’s 2025 guidelines recommend water over both sugar-sweetened and artificially sweetened beverages, but note that non-nutritive sweeteners can be used in moderation as a short-term tool to reduce overall calorie and carbohydrate intake. In practice, most people with diabetes benefit from having a go-to sweetener for different situations:
- For coffee, tea, and drinks: Stevia drops or monk fruit drops dissolve easily and add no carbohydrates.
- For baking: Allulose or a monk fruit/erythritol blend provides the bulk and browning that pure extracts can’t.
- For drizzling on foods: Yacon syrup offers sweetness with prebiotic benefits that may improve insulin sensitivity over time.
Start with small amounts of any new sweetener to test your personal tolerance and taste preference. Sugar alcohols like erythritol and xylitol can cause digestive issues at higher doses, and concentrated extracts like pure stevia are easy to overdo. Blended products designed to measure cup-for-cup with sugar tend to be the most forgiving for people new to sugar substitutes.