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A snack labelled “high fibre” or “sugar free” may look like a straightforward choice. If you live with irritable bowel syndrome (IBS), the ingredient list can add useful detail: which fibre has been added, which sweetener is used, and how much of the product you plan to eat.
You do not need to memorise every additive. Start with two groups worth recognising: inulin and related added fibres, and sugar alcohols, also called polyols.
Start with the ingredients, then check the portion
On Australian packaged foods, ingredients are generally listed from greatest to smallest amount by weight at manufacture. That helps you compare products, but it does not tell you the exact dose of every ingredient. An ingredient near the end of a list is not automatically suitable for your individual tolerance. See Food Standards Australia New Zealand’s explanation of ingredient lists.
Check the serving size in grams and the number of servings in the pack. A large bag may contain several labelled servings. If you eat twice the stated portion, you also eat twice the amount of each ingredient. For FODMAP purposes, a manufacturer’s serving suggestion is not a personalised tolerance threshold.
Why added inulin deserves a second look
Inulin is a fermentable fibre. Monash University notes that it can worsen gas-related symptoms in some people with IBS. Fructooligosaccharides (FOS) and galactooligosaccharides (GOS) are other rapidly fermented fibres that may cause difficulty. These names can be useful to recognise when comparing a fibre supplement or a food with added fibre. Monash’s guide to fibre supplements and IBS explains why the type of fibre matters.
This is not a reason to avoid fibre as a whole. Different fibres behave differently, and reducing food variety can make it harder to meet your needs. If a new fibre-containing product seems to coincide with symptoms, take its label to your dietitian rather than cutting out several food groups at once.
Some fermentable fibres also have a prebiotic role. That can coexist with poor tolerance at a particular amount: a potentially useful ingredient is not necessarily comfortable for every person in every portion. Monash’s prebiotic fibre guidance encourages working towards the foods and amounts you tolerate.
Recognise polyol sweeteners by name
Sorbitol and mannitol occur naturally in some foods. Other polyols, including xylitol, maltitol and isomalt, are used in manufactured products such as chewing gum and mints. Some packs carry a warning about a possible laxative effect.
Polyols can draw water into the bowel and be fermented by gut bacteria. Whether that produces symptoms depends on factors including the amount consumed and individual sensitivity. You may tolerate one product or portion but find another uncomfortable. Monash explains polyols and individual tolerance.
“Sugar free” does not mean “polyol free”. Equally, not every sweetener is a polyol, so avoid using “all sweeteners” as a single trigger category. Check the actual name, and remember that blends may contain more than one sweetening ingredient. This Monash overview distinguishes the main sweetener groups.
A simple supermarket comparison
Imagine comparing two snack bars. One lists added inulin and maltitol; the other does not. That difference gives you a useful question to explore with your dietitian. It does not prove that the first bar will cause symptoms, or that the second is low FODMAP: the remaining ingredients, portion and your own dietary needs still matter.
- Photograph the full ingredient list and serving information.
- Note the amount you actually eat, including repeated portions.
- Compare like-for-like products before making several changes.
- Record comfortable meals too, so your notes show what works.
Use label reading to widen your choices
If a low FODMAP diet is appropriate, it should progress through restriction, reintroduction and personalisation with suitable guidance. The aim is a workable, varied diet, not a growing blacklist. Monash outlines the three stages.
Our practical FODMAP planning article offers ideas for organising that process. For a meal with a short ingredient list, try our ginger chicken and rice noodle soup, or explore the recipe collection.
Persistent or changing digestive symptoms deserve assessment by your GP. An Accredited Practising Dietitian can help interpret your food notes and plan changes without unnecessary restriction. This article provides general education and does not diagnose a food intolerance.