Can sugar-free food contain calories?
Yes.
Is Sugar-Free Really Better for You?
Published · Updated · Sláinte Editorial
Sugar-free sounds like a verdict.
It is actually a description of one part of the food.
A sugar-free version of a drink may contain dramatically less sugar than the regular version. That can be useful.
It does not automatically tell you everything else you need to know about the product.
The most useful question is: Better than what, and for which outcome?
What does sugar-free mean?
Under EU nutrition-claim rules, a product making a sugars-free claim must contain no more than 0.5g sugars per 100g or 100ml.
That is a precise regulated claim.
It does not mean zero calories, and it does not mean nutritionally perfect.
Sugar-free vs no added sugar
These claims are not the same.
Sugars-free refers to the total-sugars threshold.
No added sugar is about whether sugars or other foods used for their sweetening properties were added.
A no-added-sugar product can still contain naturally occurring sugars.
A product can also contain authorised sweeteners depending on its formulation.
What replaces the sugar?
There is no universal replacement.
Products may use:
- acesulfame K
- aspartame
- sucralose
- polyols
- combinations of sweeteners
- a completely different formulation
That is why the ingredients list matters.
Sugar-free soft drinks
If a regular soft drink contains a large amount of sugar and the zero version contains almost none, the sugar difference is meaningful.
The sugar-free drink may also provide substantially less energy.
But neither statement tells you whether the drink contains caffeine, useful nutrients or different sweeteners.
Those are separate questions.
Sugar-free energy drinks
This is a perfect example.
Removing sugar does not necessarily change caffeine.
A zero-sugar energy drink can still contain the same caffeine concentration as the sugared version.
So the useful comparison depends on what you care about.
Sugar-free yoghurt
Yoghurt creates a different problem.
Plain yoghurt naturally contains lactose.
A “sugar-free” discussion that ignores naturally occurring milk sugar can become confusing quickly.
Always distinguish total sugars, added-sugar ingredients and regulated claims.
Sugar-free protein bars
Protein bars may use polyols such as maltitol.
Polyols are not identical to intense sweeteners such as sucralose.
A low-sugar bar can still contain substantial energy.
Again: low sugar ≠ no calories.
Does sugar-free help reduce sugar intake?
If you replace a high-sugar product with a comparable sugar-free version, your sugar intake from that product can fall substantially.
That is straightforward.
What should not follow automatically is Therefore this product guarantees weight loss or Therefore this product is healthy.
Long-term diet outcomes involve more than one product characteristic.
What does WHO say about non-sugar sweeteners?
WHO issued guidance in 2023 advising against relying on non-sugar sweeteners as a long-term weight-control strategy.
That recommendation has a specific scope and is not the same thing as a toxicological conclusion that authorised sweeteners are unsafe.
Safety assessments and dietary recommendations ask different questions.
Better than what?
This is the decision framework to keep.
Soft drink
Check sugar, energy, caffeine and sweeteners.
Yoghurt
Check total sugars, ingredients, protein and portion.
Protein bar
Check sugars, polyols, protein, energy and saturated fat.
What this means when you’re shopping
Do not stop at SUGAR-FREE.
Turn the product around.
Ask what changed. Then ask what did not.
How Sláinte helps
Sláinte can help show the sweeteners, nutrition and ingredients in the context of the whole product.
The aim is not to turn sugar-free into a new health halo.
Frequently asked questions
Is no added sugar the same as sugar-free?
No.
Are polyols the same as artificial sweeteners?
No. They are a distinct category.
Is sugar-free automatically healthy?
No.
Does WHO say sweeteners are unsafe?
WHO’s dietary recommendation on non-sugar sweeteners should not be confused with the toxicological safety assessments performed by authorities such as EFSA and JECFA.
Can sugar-free drinks still contain caffeine?
Yes.
The short version
- Sugar-free is a regulated claim.
- It describes sugar, not the whole product.
- Sugar-free does not mean calorie-free.
- No added sugar means something different.
- Sweeteners differ from each other.
- Polyols are not the same as intense sweeteners.
- Sugar-free energy drinks can still contain caffeine.
- WHO dietary guidance is not the same as a toxicological safety verdict.
- Ask “better than what?”
Sources
- European Commission nutrition claims
- FSAI nutrition and health claims
- WHO non-sugar sweeteners guidance
- WHO guideline
Last reviewed: 5 October 2026