What is the best sugar substitute for blood sugar?

Allulose, monk fruit, and stevia all have no meaningful effect on blood glucose. Allulose is the closest to real sugar in taste and behaviour, and it is the only one that browns and caramelizes properly in baking. Monk fruit and stevia are zero calorie and heat stable. Erythritol and xylitol also have little or no blood sugar effect, but both have been linked to cardiovascular events in recent studies. Maltitol is the one to avoid, since it raises blood sugar substantially despite appearing on sugar-free labels.

Is allulose better than erythritol?

For most purposes yes. Allulose has no cooling aftertaste, browns and caramelizes like real sugar so it works in baking, and is gentler on digestion for most people. Erythritol has been linked to cardiovascular events in a 2023 Nature Medicine study, an association rather than proof, but one that makes the case for erythritol less clear than it used to be. Allulose is newer, so its long-term human data is thinner.

Why is allulose only 70 percent as sweet as sugar?

Allulose is a rare sugar with a different molecular structure than sucrose, so it registers as less intensely sweet. This is usually listed as a drawback, but many people who are reducing sugar do not compensate by adding more, and find the lower sweetness suits them. Research shows that after about three months of lower sugar intake, people perceive the same concentration of sugar as roughly 40 percent sweeter than before, so a less sweet sweetener often stops feeling less sweet.

Do sugar substitutes help with weight loss?

The evidence is weaker than most people assume. In 2023 the World Health Organization advised against using non-sugar sweeteners as a weight control strategy, since long-term studies did not show the sustained benefit expected. Sweeteners are genuinely useful for reducing sugar and blood sugar spikes, but they do not appear to solve weight on their own, and they do not reduce a preference for sweetness.

Which sweetener, and does it matter?

Sweetness, calories, blood sugar, aftertaste, and how each one actually behaves when you cook with it. Including the ones this site would not reach for, and why.

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The thing worth saying before the table

Swapping sugar for a sweetener is a useful move. It is not the goal.

The goal is needing less sweetness at all, and that is a genuinely achievable thing rather than a motivational line. After about three months of eating less sugar, people rate the same concentration of it as roughly 40 percent sweeter than they did before. The food did not change. The calibration did.

That is why the honest answer to "which sweetener" is usually "the one that gets you to a smaller amount of sweetness overall." A sweetener you use by the cupful to keep everything as sweet as it was is solving the blood sugar problem while leaving the craving problem exactly where it was.

The World Health Organization advised in 2023 against relying on non-sugar sweeteners for weight control, for roughly this reason: the long-term benefit people expect does not reliably show up.

The short version
Sweetener	Sweetness	Calories/g	Blood sugar
Allulose	About 70% of sugar	About 0.2 to 0.4 per gram	No meaningful rise
Monk fruit	150 to 250 times sugar	Zero	No rise
Stevia	200 to 350 times sugar	Zero	No rise
Erythritol	About 70% of sugar	About 0.24 per gram	No meaningful rise
Xylitol	About the same as sugar	About 2.4 per gram	Small rise
Sucralose	About 600 times sugar	Zero	No rise
Aspartame	About 200 times sugar	Effectively zero	No rise
Acesulfame potassium	About 200 times sugar	Zero	No rise
Saccharin	300 to 400 times sugar	Zero	No rise
Maltitol	75 to 90% of sugar	About 2.1 per gram	Meaningful rise
Sorbitol	About 60% of sugar	About 2.6 per gram	Small rise
Honey, maple, coconut sugar	Roughly sugar	About 4 per gram	Full rise

Allulose

Closest to sugar

Rare sugar · About 70% of sugar · About 0.2 to 0.4 per gram calories per gram

What it has going for it. Tastes and behaves the closest to real sugar of anything on this page. It browns and caramelizes, which almost nothing else here does, so it actually works in baking. No cooling aftertaste, and gentler on digestion than the sugar alcohols for most people.

What to watch. Large amounts can still cause bloating or loose stools, so work up rather than starting with a cup of it. It is the newest of these, which means the long-term human data is thinner than for stevia or sucralose. Availability differs by country, so check what is sold where you are.

Monk fruit

Solid everyday choice

Non-nutritive · 150 to 250 times sugar · Zero calories per gram

What it has going for it. Clean sweetness with less of the aftertaste problem that stevia has for a lot of people. Heat stable, so it holds up in cooking.

What to watch. Almost every monk fruit product on the shelf is mostly erythritol with a little monk fruit extract in it, because pure extract is intensely sweet and hard to measure. If you are avoiding erythritol, read the ingredient list rather than the front of the bag.

Stevia

Solid everyday choice

Non-nutritive · 200 to 350 times sugar · Zero calories per gram

What it has going for it. Plant derived, zero calories, no blood sugar effect, and the most studied of the plant-based options. Widely available everywhere.

What to watch. A bitter or licorice-like aftertaste that some people taste strongly and others do not notice at all. Which one you are is worth finding out with a small package. Packet versions are often bulked with dextrose or maltodextrin.

Erythritol

Worth a second look

Sugar alcohol · About 70% of sugar · About 0.24 per gram calories per gram

What it has going for it. For years this was the default recommendation: nearly zero calories, no blood sugar effect, and better digestive tolerance than the other sugar alcohols.

What to watch. A distinct cooling sensation on the tongue that is hard to unnotice once you have noticed it. More importantly, a 2023 study in Nature Medicine linked higher blood erythritol to cardiovascular events, with a proposed mechanism of increased clot formation. That is an association rather than proof, and it does not make erythritol dangerous on the evidence available, but the picture is less settled than it looked a few years ago.

Xylitol

Worth a second look

Sugar alcohol · About the same as sugar · About 2.4 per gram calories per gram

What it has going for it. One-to-one sweetness makes it easy to substitute, and it has genuine dental benefits, which is why it turns up in gum and toothpaste.

What to watch. Severely toxic to dogs, even in small amounts, which alone is reason to be careful if you have one. It carries real calories and a small blood sugar effect, unlike most of this list. And a 2024 study in the European Heart Journal found the same cardiovascular association reported for erythritol.

Sucralose

Fine, with caveats

Non-nutritive · About 600 times sugar · Zero calories per gram

What it has going for it. No aftertaste for most people and it holds up reasonably in cooking, which is why it is the most widely used of the older artificial sweeteners.

What to watch. The packet form is mostly dextrose or maltodextrin as a bulking agent, so a packet is not calorie-free or carb-free even though the label rounds to zero. Some evidence suggests high-heat baking may degrade it, so it suits drinks and no-bake uses better.

Aspartame

Fine, with caveats

Non-nutritive · About 200 times sugar · Effectively zero calories per gram

What it has going for it. Decades of use and a large body of research behind it. No aftertaste for most people.

What to watch. Breaks down under heat, so it is not usable for baking. Unsafe for anyone with phenylketonuria, which is why the warning appears on the label. In 2023 the IARC classified it as possibly carcinogenic to humans (Group 2B) while the joint FAO/WHO expert committee reviewed the same evidence and left the acceptable daily intake unchanged. Those two things are less contradictory than they sound: the classification describes strength of evidence, not size of risk.

Acesulfame potassium

Fine, with caveats

Non-nutritive · About 200 times sugar · Zero calories per gram

What it has going for it. Heat stable and cheap, which is why it appears in so many products.

What to watch. A slightly bitter edge, which is why it is nearly always blended with sucralose or aspartame rather than used alone. Listed as acesulfame-K or ace-K.

Saccharin

Fine, with caveats

Non-nutritive · 300 to 400 times sugar · Zero calories per gram

What it has going for it. The oldest one, in use for over a century, and inexpensive.

What to watch. A metallic aftertaste most people notice. The 1970s bladder cancer scare came from rat studies through a mechanism that does not apply to humans, and the warning label was withdrawn in 2000. It is a taste problem now, not a safety one.

Maltitol

Easy to regret

Sugar alcohol · 75 to 90% of sugar · About 2.1 per gram calories per gram

What it has going for it. Behaves a lot like sugar in candy and chocolate, which is why manufacturers like it for sugar-free products.

What to watch. The one most likely to catch you out. It raises blood sugar substantially more than people expect from something on a sugar-free label, and it is a well-known cause of digestive distress. If a sugar-free chocolate bar disagrees with you, this is usually why.

Sorbitol

Easy to regret

Sugar alcohol · About 60% of sugar · About 2.6 per gram calories per gram

What it has going for it. Cheap, and it holds moisture well, which is why it is common in sugar-free gum and mints.

What to watch. The most reliably laxative of the sugar alcohols. Fine in a stick of gum, unpleasant in quantity.

Honey, maple, coconut sugar

This is sugar

Sugar · Roughly sugar · About 4 per gram calories per gram

What it has going for it. Real flavor that refined sugar does not have, and trace minerals. If you want a spoonful of honey in something, have a spoonful of honey.

What to watch. These are sugar. They are on this page only because they are so often presented as alternatives to it. The glycemic differences are real but small, and none of them deliver what people are usually hoping for, which is fewer cravings. See every name for sugar for the full picture.

Choosing by what you're actually doing

For baking, allulose, because it browns and caramelizes the way sugar does. Almost nothing else here will. Monk fruit and stevia are heat stable but contribute no bulk or browning, so they work better in things that do not need structure. Aspartame breaks down under heat entirely.

In coffee and tea, whatever you like the taste of, and the aftertaste question decides it. Stevia divides people sharply, so buy the smallest package before committing. This is also the easiest place to practise using slightly less each week.

For managing blood sugar, allulose, monk fruit, or stevia. Avoid maltitol specifically, which raises blood sugar substantially while sitting on a sugar-free label.

With a sensitive gut, stevia or monk fruit, neither of which ferments in the gut. Sugar alcohols are the usual culprits, sorbitol and maltitol especially.

If you have a dog, no xylitol in the house. It is severely toxic to dogs in small amounts, and the gum in a handbag is the classic way it happens.

The part no sweetener does for you

None of these change why the craving showed up. That is the meal before it, and it is a more solvable problem than it sounds. The sugar-craving cycle covers the mechanism, and the swap finder handles a specific craving in the moment.

If you want to see how much sugar you are actually working with before deciding what to replace it with, how much sugar is in that lists everyday foods in grams and teaspoons.

Take the free craving quiz