A practical label check
What should you check on the packet?
- Match the exact name or E-number.
- Check whether the nutrition panel gives total polyol grams.
- Look for the UK excessive-consumption warning.
- Multiply the labelled amount by the number of servings actually eaten.
What the label can tell you
A UK label can identify the sweetener, sometimes show total polyol grams and, for foods with more than 10% added polyols, carry a laxative-effect warning.
What the label cannot tell you
A label may not split total polyol grams by type, account for repeated servings or predict an individual response.
Worked UK label
How to reason through this ingredient list
Fixture: sugar-free mints
Sweeteners (sorbitol, xylitol), peppermint oil. Excessive consumption may produce laxative effects.
- What stands out
- Two polyols are present and the warning signals that added polyols exceed the UK labelling threshold.
- Reasonable conclusion
- The number of mints eaten matters more than treating one mint as the only serving.
- What we cannot conclude
- The warning does not say that everyone will have symptoms or identify a personal threshold.
Common questions
Questions people ask about this label
Are all ingredients ending in “-ol” polyols that affect digestion?
No. The ending is an unreliable shortcut. Use the known label names and E-numbers instead: sorbitol, mannitol, isomalt, maltitol, lactitol, xylitol and erythritol.
SourcesUK approved-additives listMonash label-reading guidance
What does “polyols” in the nutrition panel mean?
It is a carbohydrate sub-line showing the total amount of polyols when the manufacturer provides it. It may not tell you how much of each named polyol is present.
SourcesUK food-labelling guidance
What does the UK laxative-effect warning mean?
Foods containing more than 10% added polyols must say that excessive consumption may produce laxative effects. It is a threshold for a label warning, not a prediction that one serving will affect everyone.
SourcesUK food-labelling guidance
Why can several small servings matter?
Polyol effects are dose-related. Five mints, repeated pieces of gum or a whole “single” bar can create a larger exposure than the serving used on the panel.
SourcesPolyol systematic review
How do I calculate polyols for the portion I ate?
When the panel gives polyols per 100 g, multiply that number by the grams eaten and divide by 100. For example, 30 g per 100 g × a 45 g portion ÷ 100 = 13.5 g total polyols. The result may still combine several polyols.
SourcesUK food-labelling guidance
Are all polyols equally likely to cause symptoms?
No. Absorption, fermentation and evidence differ between polyols, and tolerance varies substantially between people. A useful label explanation names the specific polyol instead of assigning one risk rating to the whole family.
SourcesPolyol systematic review
Evidence and uncertainty
How to check a food label for polyols: how strong is the evidence?
Human studies support dose-related gastrointestinal and laxative effects for several polyols, with large differences between compounds and individuals.
SourcesPolyol systematic reviewUK food-labelling guidanceUK approved-additives listMonash label-reading guidance
References
Sources used for this page
- Lenhart and Chey (2017), Systematic review of polyols and gastrointestinal health
- UK Government, Food labelling: giving food information to consumers
- Food Standards Agency, Approved additives and E numbers
- Monash University, Label reading and how to spot FODMAPs
Written and evidence-checked by the GutGuard editorial team. We favour official UK guidance, systematic reviews and primary human research, and label animal, laboratory and exploratory findings clearly. Read our editorial method.