The Honest Truth About Maltitol, Erythritol & Friends

Updated June 2026 · 7 min read · Properly researched, gut-friendly reading

Key Takeaways

• Sugar alcohols are neither sugar nor alcohol – they are a type of carbohydrate that mimics both.
• They are everywhere in “sugar-free” and “no added sugar” products, particularly chocolate and chewing gum.
• They cause genuine, well-documented digestive problems for a lot of people. Bloating, gas, urgent toilet trips. Not pleasant.
• Recent research has linked erythritol (often considered the safest one) to a higher risk of heart attack and stroke.
• Maltitol is the one most commonly used in sugar-free chocolate, and it has the worst glycaemic impact of the bunch.
• There are better options. Natural sweeteners like yacon syrup and stevia do the job without the side effects.

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The honest answer first

Sugar alcohols are mostly safe in small amounts. The trouble is, for a lot of people, even one serving of a sugar-alcohol-sweetened product is enough to trigger bloating, gas or an urgent need to find a toilet. For others, the problem only shows up after a couple of bars. And then there is the more recent and more alarming evidence about erythritol (the one everyone used to consider safe) and its possible link to heart attacks and strokes.

This is not us scaremongering for fun. Sugar alcohols have a place in food science, and the chocolate industry is genuinely fond of them because they save calories and money. But there is a reason your stomach sometimes files a formal complaint after a “sugar-free” treat, and you deserve to know what is going on. The next 7 minutes will give you the full picture.

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What sugar alcohols actually are

Despite the slightly menacing name, sugar alcohols are not alcohol and not really sugar either. They are a category of carbohydrate that resembles both chemically, which is how they ended up with the unfortunate label.

A few sugar alcohols (like small amounts of xylitol) occur naturally in fruits and vegetables. But the ones used in mass-produced chocolate are almost always manufactured through a process called hydrogenation – hydrogen molecules are bolted onto regular sugar to create something that tastes sweet but is processed differently by your body.

That “processed differently” bit is where most of the trouble starts.

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Meet the family (and their party tricks)

There are about half a dozen sugar alcohols you are likely to bump into on an ingredients label. They are similar enough to be confused with each other, and different enough that knowing which is which genuinely matters.

Sorbitol

Found in sugar-free gum, sweets and some medications. Roughly 60% as sweet as regular sugar. Has a laxative effect that can kick in at around 30 grams, which sounds like a lot until you realise some sugar-free products can hit that in a single serving.

Maltitol

The one used most often in sugar-free chocolate, because it behaves most like regular sugar in terms of texture and sweetness. The catch is its glycaemic index is the highest of any common sugar alcohol (around 35-52), meaning it can spike your blood sugar despite the “sugar-free” label. Frankly, the one you most want to avoid.

Erythritol

Used to be the golden child. Almost zero calories, around 70% the sweetness of sugar, and gentler on digestion than its cousins. But a study published in Nature Medicine raised serious concerns: higher levels of erythritol in the blood were linked to an increased risk of major cardiac events, including heart attacks and strokes. More research is needed, but “wait and see” is not a great strategy when your heart is involved.

Xylitol

Genuinely has some active dental benefits – it actually helps prevent tooth decay, which is why it shows up in sugar-free chewing gum and mints. The problem: more than 100 grams a day can cause significant gastrointestinal distress, and it is highly toxic to dogs. Even small amounts can be fatal. If you have a dog, keep xylitol products well out of reach.

Mannitol

The strong stuff. Has a particularly powerful laxative effect at doses as low as 20 grams, which is why it is less common in food products. If you spot it on a label, that is a useful warning.

Lactitol, isomalt, and HSH

The supporting cast. Less commonly used, but similar properties and similar potential issues.

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Want chocolate that skips the sugar alcohols entirely? Try Mr Popple’s sugar free chocolate – sweetened with yacon syrup, never maltitol, sorbitol, or anything else ending in “-itol”.

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Why they’re not the “guilt-free miracle” the packaging suggests

1. The bloating and gas situation

Sugar alcohols are not fully absorbed in your small intestine. So they travel down into the large intestine, where your gut bacteria ferment them. Fermentation produces gas. Gas produces, well, the obvious result. Sugar alcohols are notorious for causing bloating and flatulence, and it is not a small effect for most people.

2. Abdominal pain and urgent loo trips

When the unabsorbed sugar alcohols sit in your intestines, they draw water in by osmosis. The result is loose stools and abdominal pain, especially with larger doses. The medical term is “osmotic diarrhoea”. The personal term is “I’m not leaving this bathroom for a while”.

3. They can still spike your blood sugar

Sugar alcohols are often marketed to diabetics as a safe alternative to sugar. And some of them are, sort of. But maltitol in particular has a real glycaemic impact – it is not zero, despite the “sugar-free” label. If you are managing diabetes, the difference between maltitol and yacon syrup is genuinely meaningful.

4. The IBS and IBD problem

If you have irritable bowel syndrome or inflammatory bowel disease, sugar alcohols can be particularly rough. They are classified as FODMAPs – the group of carbohydrates that most reliably trigger IBS symptoms. For sensitive systems, even small amounts can cause flare-ups.

5. The erythritol heart question

This is the newest and most concerning piece of evidence. The Nature Medicine study found a strong association between higher blood erythritol levels and major adverse cardiac events. Association is not causation, and more research is underway. But for a sweetener that was being added to “heart-healthy” products specifically for being low-calorie, it is a significant pause-for-thought.

6. The “calorie-free trap”

Sugar alcohols have fewer calories than sugar. Not zero. The “fewer” bit can lull people into eating much more than they would of a sugary equivalent, which means the total calorie intake often ends up the same. And some studies suggest non-nutritive sweeteners can actually increase appetite, partly defeating the point of choosing them in the first place.

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So what’s the actual cheat sheet?

If you remember nothing else from this article, take this:

Sweetener	Found In	Main Issue	Verdict
Maltitol	Most “sugar-free” chocolate	Spikes blood sugar; digestive issues	Avoid
Sorbitol	Gum, sweets	Laxative at 30g+	Avoid in larger doses
Mannitol	Some baked goods	Strong laxative at 20g+	Avoid
Xylitol	Gum, mints	Toxic to dogs; GI issues at 100g+	Use cautiously
Erythritol	“Keto” snacks, some chocolate	Possible cardiovascular risk	Question marks – approach with care
Stevia	Many natural-positioned products	Slight aftertaste	Fine
Monk fruit	Premium sugar-free options	None notable	Fine
Yacon syrup	Mr Popple’s bars	Prebiotic benefit	Best option
Coconut sugar	Mr Popple’s mylk bars	Still a sugar (lower GI)	Good compromise

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The natural alternative: what to actually look for

If sugar alcohols are off the table, the obvious question is what to reach for instead. The honest answer: ingredients you can pronounce.

Yacon syrup is our personal favourite, and not just because we use it. It is a low-glycaemic sweetener (GI of around 1) made from the root of a Peruvian plant. It is rich in fructo-oligosaccharides, which are prebiotic fibres that feed the friendly bacteria in your gut. So instead of triggering digestive havoc like sugar alcohols often do, yacon actually does the opposite. Quietly excellent.

Coconut sugar is what we use for our dairy free mylk chocolate bars. It is not strictly sugar-free – it is still a sugar – but its glycaemic impact is roughly half that of cane sugar, and it brings a lovely caramel note that suits creamier chocolate.

Stevia and monk fruit are both natural zero-calorie options that work well in some applications. They can have a slight aftertaste, which is why they are not in everything, but they are genuinely safe.

The other things worth looking for on the label of any chocolate calling itself healthier:

• A high cacao percentage – the higher the better for antioxidants and real flavour
• Cocoa butter as the fat source, not palm oil or “vegetable fats”
• Short ingredients lists – if it reads like a chemistry exam, put it back

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Reading the label like a pro

This is the single most useful skill you can develop in the confectionery aisle. The front of a wrapper is marketing. The back is the truth.

Here is what to scan for:

• The sweetener (first ingredients usually): is it natural or a sugar alcohol?
• The cacao: at least 70% if you want the real health benefits
• Hidden fats: cocoa butter only, ideally
• Fibre content: more is better – it slows sugar absorption
• Allergens and warnings: especially relevant for IBS sufferers

If a bar’s first three ingredients include maltitol, polydextrose, or anything ending in “-itol”, and the cocoa content is below 50%, you are probably better off with a small piece of proper dark chocolate instead.

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What about children?

A specific note worth flagging: children’s digestive systems are often more sensitive to the laxative effects of sugar alcohols. If your kid demolishes a bag of sugar-free sweets, you may be in for a rough afternoon. Stick to natural alternatives, or better yet, proper dark chocolate in small portions.

For pet owners, xylitol deserves a serious warning: even tiny amounts are highly toxic to dogs. If you keep xylitol gum or mints in the house, treat them like medication. Locked away, well out of reach.

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The bottom line

Sugar alcohols are not the guilt-free miracle the packaging suggests. They cause digestive issues for a significant chunk of the population, some of them have measurable blood-sugar impact despite the “sugar-free” label, and the safest one (erythritol) has just had a serious question mark hung over its cardiovascular safety.

The good news is none of this means giving up sweet things. It just means choosing better sweet things. Natural sweeteners like yacon syrup, stevia, and even coconut sugar achieve the same result without ambushing your gut or your heart. The “sugar-free” claim on the front of a wrapper means almost nothing. The ingredients list on the back tells you everything.

At Mr Popple’s, we made the decision early on to skip sugar alcohols entirely. We use yacon syrup or coconut sugar instead, in raw organic chocolate bars made under genuinely ethical production standards. It costs us a bit more. We think it is worth it. Your stomach will agree.

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Sugar alcohols not for you?

Mr Popple’s bars are sweetened with yacon syrup or coconut sugar – never maltitol, sorbitol, or any other “-itol”. Your gut, your heart, and your taste buds will all thank you.

Free UK delivery on orders over £25 · Plastic-free packaging

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Frequently Asked Questions

Are all sugar-free chocolates made with sugar alcohols?

No. Plenty of brands use natural alternatives like stevia, monk fruit, or yacon syrup. The trick is reading the ingredients list rather than trusting the front of the wrapper. If you want truly sugar-alcohol-free options, look at brands that lead with their sweetener choice rather than hide it.

Can children safely eat chocolate sweetened with sugar alcohols?

Best avoided where possible. Children’s digestive systems are typically more sensitive to the laxative effects of sugar alcohols. A small amount is unlikely to cause harm, but larger portions can lead to a fairly miserable afternoon for everyone. Natural alternatives are a much safer bet.

Why is xylitol dangerous to dogs?

Xylitol causes a rapid release of insulin in dogs, which can drop their blood sugar to dangerously low levels and cause liver failure. Even small amounts can be fatal. If you have a dog and you use xylitol gum or sugar-free baked goods, store them like you would medication.

Is erythritol still considered safe?

The answer used to be a confident yes. After the 2023 Nature Medicine study linking higher blood erythritol levels to cardiac events, the answer is now genuinely “we are not sure”. More research is in progress. In the meantime, if you have cardiovascular risk factors, it may be wise to limit erythritol where you can.

What’s the difference between sugar alcohols and artificial sweeteners?

Sugar alcohols (like maltitol and erythritol) are partially absorbed by your body and contain some calories. They affect blood sugar to varying degrees and often cause digestive issues. Artificial sweeteners (like aspartame and sucralose) are typically calorie-free, do not affect blood sugar, and rarely cause digestive trouble – though they come with their own set of debated questions and a more chemical aftertaste.

Can I have an allergic reaction to sugar alcohols?

True allergies are rare. What is much more common is intolerance, which shows up as bloating, gas, cramps or diarrhoea. The symptoms are usually dose-dependent, so a small amount might be fine while a larger amount becomes unpleasant. If you have a known allergy to the source plant (corn-derived xylitol, for example), avoid it.

What chocolate should I eat instead?

High-cocoa dark chocolate (70% or higher) sweetened with natural alternatives like yacon syrup, stevia, or coconut sugar is the safest and most satisfying option. The cocoa is genuinely good for you, the sweetener is gentle on your gut, and the flavour is closer to what chocolate is meant to taste like.