Natural vs Artificial Sweeteners: What the Labels Don't Tell You
Natural vs Artificial Sweeteners: What the Labels Don't Tell You
Erythritol and stevia are sold as natural. Both are made in a factory. Here is what the word actually means in Europe, and what each sweetener does once you swallow it.
There is no legal definition of a natural sweetener in Europe. That is why erythritol and xylitol sit on shelves under a natural banner, although both are brewed in industrial fermenters from corn starch. Only a few sweeteners come from a plant and stay recognisable as one. A monk fruit decoction is fruit and water, with the water taken back out.
Walk down the baking aisle and every packet says something reassuring. Plant based. Naturally sourced. From the leaf. Very little of that language is regulated.
A sweetener can be built in a steel tank from corn syrup and still call itself natural, because nobody has written a rule that says otherwise. Meanwhile the one that grew on a vine costs three times as much and says less on the front of the pack. This article sorts out which is which.
Natural means one thing in Brussels and another in Washington
Europe regulates the word for flavourings. A natural flavouring has to come from a plant, an animal or a microorganism, and it has to be obtained by a physical, enzymatic or microbial process. Sweeteners are different. Europe treats them as food additives and gives them E numbers.
Aspartame is E951. Erythritol is E968. Steviol glycosides are E960. The E number tells you the additive is approved. It tells you nothing about whether it grew. America is looser still, because the FDA has never defined natural for food at all.
You cannot read the word natural off a label and learn anything useful. You have to ask how the thing was made. That single question sorts the whole aisle.
The artificial sweeteners, and why people buy them
These are made in a laboratory and never pretend otherwise. People choose them for three good reasons. They are enormously sweet, so a pinch does the work of a spoonful. They cost very little. And most of them behave well in food.
Aspartame is roughly 200 times sweeter than sugar and has been in diet drinks since the 1980s.
The aspartame argument, in one paragraph
In July 2023 the World Health Organization published two verdicts on the same day. Its cancer agency classified aspartame as possibly carcinogenic to humans, citing limited evidence. Its expert committee on food additives reviewed the same material and left the safe daily intake unchanged at 40 mg per kilo of body weight. A 70 kg adult would need somewhere between nine and fourteen cans of diet drink a day to pass that limit. Two bodies, one dataset, two headlines.
Sucralose, acesulfame K and saccharin
Sucralose is about 600 times sweeter than sugar and is made by swapping three parts of a sugar molecule for chlorine. Some research suggests it may alter gut bacteria, though the studies are small and the findings are contested. Acesulfame potassium turns bitter on its own, so it is nearly always blended. Saccharin is the oldest of them, and its history is a useful warning: it carried a cancer label for twenty years until researchers worked out that the rat mechanism behind the scare does not apply to human biology. The label came off in 2000.
Here is the whole shelf in one place. Sweetness is compared with ordinary table sugar.
| Sweetener | How it is made | Sweetness | Main drawback |
|---|---|---|---|
| Aspartame | Laboratory synthesis | About 200x | Contested cancer classification |
| Sucralose | Chlorinated sugar molecule | About 600x | Open questions on gut bacteria |
| Erythritol | Yeast fermentation of starch | About 0.7x | Digestive upset, new research |
| Xylitol | Hydrogenated wood or corn | About 1x | Upset stomach, toxic to dogs |
| Steviol glycosides | Leaf extraction and purifying | 200 to 300x | Bitter or liquorice finish |
| Monk fruit decoction | Fruit boiled in water | 10 to 15x | Costs more, fruity aftertaste |
Notice the pattern in the middle column. The closer a sweetener stays to the plant it came from, the less concentrated it is.
Natural is not a safety rating. It is a description of how much has been done to your food.
The natural ones that are made in a factory
This is the group that causes the confusion, because the marketing and the manufacturing point in opposite directions. All four below get sold as natural. Only one of them is made the way you would guess.
Erythritol
You will read that it occurs in pears and grapes. It does, in traces far too small to harvest. What you buy is made by feeding starch sugar to a yeast in a tank. It is only 70% as sweet as sugar, so recipes use a lot of it, and that volume is where the bloating starts.
Xylitol
Made by hydrogenating a sugar taken from corn cobs or hardwood. It matches sugar for sweetness, which makes it easy to bake with. Dentists like it. It upsets stomachs in quantity, and it is seriously toxic to dogs.
Steviol glycosides
The sweet compounds inside the stevia leaf, pulled out with water, filtered, purified and often run through ion exchange. Some newer versions skip the leaf and are produced by fermentation. Many people taste a bitter or liquorice finish.
Monk fruit decoction
Fresh fruit crushed, steeped in water, strained, then the water boiled off. Nothing added and nothing isolated. It is the only one on this list your grandmother could have made, and the only one that stays recognisable as fruit.
One ingredient in the bottleFruit and water, with the water taken back out. Low calorie, about 1 kcal per serving, with no glycemic index per portion.
What the research actually says
The erythritol story is the one to watch. A 2023 study in Nature Medicine linked higher blood erythritol with cardiovascular events, and found in the laboratory that it made platelets stickier. Later work reported similar effects after people drank it. That sounds damning until you read the rebuttals, and the rebuttals are serious: your body makes erythritol on its own from glucose, so a high blood level may be a signal of something else going wrong rather than a record of what you ate. Association is not proof, and this argument is live.
Monk fruit sits in a quieter place. Its sweetness comes from mogrosides, which your body does not break down for energy the way it handles sugar. Some studies suggest mogrosides may have antioxidant activity, but that work is early and not clinical, and nobody should treat monk fruit as medicine. What stands out is what is absent. After eight centuries of use, no significant side effects have been reported. That is not proof of perfect safety, and we will not claim it is. Compared with a safety file that keeps reopening, a long quiet record still counts for something.
How to choose one
Forget the front of the pack. Five questions will tell you more than any claim printed on it.
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Ask how it was made
If the answer involves a fermenter or a synthesis step, you are buying a manufactured ingredient. That may be fine. Just do not pay a premium for the word natural on top of it.
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Ask how much you will use
Sweeteners close to sugar in strength get used by the spoonful, and that is where digestive trouble begins. Concentrated ones get used by the drop.
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Ask what you will cook
Aspartame collapses under heat. Erythritol and xylitol bake well because they bring bulk. Monk fruit powder bakes well for the same reason, and the liquid suits anything you stir rather than bake.
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Read the ingredients, not the claims
A short ingredients list is worth more than any word on the front. If a sweetener is mostly a carrier with a trace of something sweet, the list will show it.
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Trust your own tongue
Bitterness, cooling and aftertaste are personal. A sweetener half your household refuses to eat is not a bargain at any price.
One honest tip: no single sweetener wins every job. Most kitchens end up with two. What matters is knowing which one you are reaching for and why.
Frequently asked questions
Is erythritol natural?
It occurs in some fruit in tiny amounts, but the erythritol you buy is made by fermenting glucose from corn or wheat starch. That is an industrial process, whatever the pack says.
Is stevia natural?
The leaf is. The sweetener is a purified compound taken out of the leaf, and some newer versions are made by fermentation instead. Closer to natural than aspartame, further from it than the marketing suggests.
Which sweetener is the most natural?
By the plain meaning of the word, a whole fruit decoction. It is fruit and water, with the water taken back out. Nothing is added and nothing is isolated.
Is aspartame dangerous?
The World Health Organization cancer agency lists it as possibly carcinogenic, citing limited evidence. Its own additives committee reviewed the same evidence and kept the daily limit unchanged. Most regulators consider it safe within that limit.
Why is erythritol in the news?
Studies published between 2023 and 2025 have linked it with platelet activity and cardiovascular events. The findings are associations rather than proof, and other researchers argue that blood erythritol mostly reflects what your own body produces.
Do artificial sweeteners cause weight gain?
The evidence is mixed and the trials disagree with each other. Anyone giving you a firm answer is going further than the research supports.
Which sweetener tastes closest to sugar?
Xylitol, because it matches sugar for both strength and bulk. Taste is personal though, and blends often beat any single sweetener.
Does monk fruit have an aftertaste?
Yes, a fruity one. It is mild and it fades, but it is there. Some people like it immediately and some never warm to it.
Why does monk fruit cost more?
One 75 ml bottle takes 1 to 1.5 kg of fresh fruit. The fruit spoils quickly after the August harvest, so it has to be processed straight away.
Can I bake with monk fruit?
Use the powder. It sits on tapioca fibre, so it gives a recipe the bulk it needs. The liquid works better in drinks and cold dishes.
Is monk fruit safe for people with diabetes?
Many people use it as a sugar swap because it has no glycemic index per portion. Your own plan is a conversation for you and your doctor.
Are sugar alcohols the same as artificial sweeteners?
No. Sugar alcohols such as erythritol and xylitol are a separate category with their own E numbers. They are manufactured, but by a different route, and their usual problems are digestive rather than toxicological.
Final thoughts
Natural is not a safety rating. Plenty of manufactured sweeteners have decades of use behind them and no reason for alarm. Plenty of things that grow will do you harm.
The word still matters because it tells you how much has been done to your food. A sweetener boiled out of fresh fruit has had very little done to it. That is a fact you can check, which is more than most of this aisle offers.
Fruit, water, and nothing else
Europe's first registered monk fruit brand. One ingredient in the liquid, no erythritol and no maltodextrin. Low calorie, about 1 kcal per serving, with no glycemic index per portion.
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monk fruit
References
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Happy Monkfruit is a food, not a medicine. Information here is general and not medical advice. Monk fruit is low calorie, about 1 kcal per serving, with no glycemic index per portion. If you manage a health condition, speak to your doctor.