Is xylitol a healthy sugar swap?

Is xylitol better than sugar?

Yes, if it replaces sugar rather than adding to it. Xylitol is a sugar alcohol, a type of sweetener the NHS calls a polyol. It’s approved in the UK as E967.

The NHS says approved sweeteners are a safe and acceptable alternative to sugar. Gram for gram, xylitol counts as 2.4 kcal on UK labels, against 4 for sugar.

So it’s a better swap, not a health food. The NHS says sweeteners won’t necessarily make a food healthy, but can help you cut sugar.

Have diabetes? Diabetes UK says polyols have less effect on blood sugar than sugar. But it’s not clear how to count them if you match insulin to carbs, so ask your diabetes team.

Never stop or change a prescribed medicine without your prescriber.

Next step: use xylitol in place of sugar you already have. Our guide on how to cut down on sugar shows where most of it hides.

Is xylitol good for your teeth?

It’s kinder to them than sugar. UK law lets food makers say that xylitol, used instead of sugar, helps keep the minerals in your teeth.

But it’s no shield on its own. A Cochrane review of 10 trials found its best evidence was still weak. Fluoride toothpaste with 10% xylitol may cut tooth decay by 13% in children, compared with fluoride toothpaste alone, over 2.5 to 3 years.

That evidence was low quality. For xylitol gum, sweets and other products, and for adults, there wasn’t enough evidence to tell.

Your best protection is still the NHS basics. Brush twice a day with fluoride toothpaste, spit and don’t rinse, and cut sugary food and drink. Then add cleaning between your teeth.

How much xylitol is too much?

Your gut tends to tell you first. The NHS says xylitol can have a laxative effect in large amounts. Diabetes UK lists bloating, wind and diarrhoea.

In that small trial, 12 healthy, slim adults had 7, 17 or 35 g in one go. It was mixed in water and given through a tube into the stomach. A rumbling tummy was the main effect.

The same team’s earlier trial gave 50 g, and most people got bloating and diarrhoea.

Check the pack. If added polyols make up more than 10% of a food, the label must say “excessive consumption may produce laxative effects”.

The WHO and FAO experts who set daily limits have given xylitol no set number. Bloated after sugar-free sweets or gum? Cut back and see if it settles.

Is xylitol bad for your heart?

Nobody knows yet. A 2024 study linked higher blood xylitol to major heart events, such as heart attacks and strokes. It didn’t show that xylitol causes them.

That 30 g is the dose to watch. The authors say it’s like a pint of xylitol ice cream, a xylitol cake or several xylitol sweets. Blood levels fell back near normal within 4 to 6 hours.

The authors also think the fasting levels they linked to risk mostly came from xylitol the body makes itself, not from food.

Think of the study as a smoke alarm. It doesn’t prove there’s a fire, but it does mean someone should check.

Until they have, skip big doses in one go.

How to swap sugar for xylitol

Got a dog? Xylitol can crash a dog’s blood sugar and cause liver failure. Signs can take up to 12 hours, so call your vet straight away if yours eats any.

For ideas, see healthy sweet snacks, snacks for diabetes and how much sugar a day is too much.

When to speak to a GP

Call 111 or speak to a GP if:

• You’ve had diarrhoea for more than 7 days, or vomiting for more than 2 days.
• You have bloody diarrhoea or bleeding from your bottom.
• You still have signs of dehydration, like dark, smelly pee, after using oral rehydration sachets.
• You keep being sick and can’t keep fluids down.
• You have diabetes, match insulin to carbs and aren’t sure how to count xylitol. Ask your diabetes team.

Call 999 or go to A&E if you have a sudden, severe tummy ache or headache. Do the same if you vomit blood or vomit that looks like ground coffee, have green vomit, or are confused or not responding as usual.

Checking your own levels? See blood sugar after eating.