Sugar
Serving sizes
Sugar changes rating with portion size. Its rating is estimated from what it is made of, so the servings are described rather than weighed.
- Small serving
- Large serving
Sugar is Low FODMAP, a simple sucrose that balances its glucose and fructose so there's nothing to ferment in normal amounts.
- Table sugar is sucrose, meaning its glucose and fructose come paired, which keeps it low at a small serving and only climbs to moderate at a large serving as the Excess Fructose builds up.
- Plain white and other basic sugars behave the same way, though heavily sweetened foods can stack up quickly when sugar is just one part of a larger recipe.
A modest sweetening is comfortable, so stir it into coffee or baking freely and just keep an eye on desserts where the sugar really piles up.
Why sugar is rated low
Ordinary table sugar comes out low on a low FODMAP diet, and it is worth being clear about where that answer comes from: the rating is estimated from what sugar is made of rather than from a weighed serving put through a lab, and no FODMAP subgroup is recorded for it. That is why the page talks about amount rather than mechanism. A "Small serving" is rated LOW, which covers sweetening a drink or a bowl of porridge. Push on to a "Large serving" and the rating climbs to MODERATE, so the honest answer is low, with a real ceiling. Nothing here makes sugar unlimited, and heavily sweetened food tends to deliver a large amount without feeling like it.
What changes your risk
- How much, not what kind The whole story for sugar is the amount. A "Small serving" is LOW and a "Large serving" is MODERATE, so a stir into coffee behaves very differently from a dessert built on sugar.
- Sugar you did not add yourself Sweetened drinks, sauces, cereals, baked goods and candy carry sugar you never measured, and several of them across an afternoon land closer to a "Large serving" than a single sweetened cup does.
- Stacking across the meal A low rating is per serving, not per plate. Sugar has no recorded subgroup of its own, but a sweet dish usually arrives with other things, and it is the total FODMAP load of the whole meal that decides how the meal sits.
- The sweetener next to it in the ingredient list Honey, agave syrup and high fructose corn syrup are not interchangeable with table sugar on this diet, and plenty of products use them together. Read the list rather than assuming that "sweetened" means sweetened with sugar.
- Sugar-free is not automatically the safer lane Products sweetened with sorbitol, mannitol, xylitol, maltitol or isomalt are not a low FODMAP upgrade on sugar, and neither is anything bulked with inulin or chicory root fibre.
What else works
Sugar is already the low FODMAP sweetener, so most of the useful advice is about what not to reach for instead. Maple syrup and rice malt syrup fill the same role in drinks, baking and sauces, and stevia is another option where a small sweetening is all you want. The lookalikes to leave alone are honey, agave syrup and high fructose corn syrup, which are not low FODMAP swaps for sugar at ordinary amounts, along with the sugar-free sweeteners ending in -ol such as sorbitol, xylitol and maltitol that turn up in diet drinks, gum and mints.
How to keep it low
Keeping sugar in the low lane is mostly about keeping the sweetening visible. When you sweeten a drink or a bowl yourself you can see the "Small serving" you are adding; when it arrives baked into a dessert or a bottled drink you cannot, and that is where a "Large serving" hides. Baking at home helps because you control the amount and can dial it back without changing much else. In cafes and restaurants, the sweetened item is usually the one to split or finish rather than order twice, and it is worth glancing at a label on flavoured yoghurts, granolas and sauces, where sugar frequently shares the list with honey, agave or inulin. Spreading sweet things across the day rather than piling them into one sitting also keeps the total easier to manage.
Common questions
is sugar low fodmap
Yes. Table sugar is rated low, and that rating is estimated from its composition rather than from a measured laboratory serving. A "Small serving" is LOW, while a "Large serving" is MODERATE.
how much sugar can i have on a low fodmap diet
The published ladder for sugar is qualitative rather than weighed, so there is no gram figure to quote. A "Small serving" sits at LOW and a "Large serving" moves up to MODERATE, which means normal sweetening of a drink or a dish is the comfortable zone and a sugar-heavy dessert is not.
can i use sugar during the elimination phase
Sugar is a low FODMAP ingredient at a "Small serving", so it is generally used during elimination for ordinary sweetening. Tolerance still varies between people, and reintroduction of anything is done with a dietitian.
is honey a good substitute for sugar on a low fodmap diet
No. Honey is not a low FODMAP swap for table sugar, and neither is agave syrup or high fructose corn syrup. Maple syrup or rice malt syrup are the better stand-ins when you want a liquid sweetener.
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Informational only, not medical advice. Individual tolerance varies. Talk to a healthcare professional or a dietitian for personal guidance.
Sugar is an estimated rating: it is inferred from the food's ingredients and composition and cross-checked, not measured directly in the papers below. The low, moderate and high cutoffs are still those of Varney et al. (2017).
References
- Fructan and free fructose content of common Australian vegetables and fruit. Muir et al. (2007), J. Agricultural and Food Chemistry 55(16):6619-6627.
- Measurement of short-chain carbohydrates in common Australian vegetables and fruits by HPLC. Muir et al. (2009), J. Agricultural and Food Chemistry 57(2):554-565.
- Quantification of fructans, galacto-oligosaccharides and other short-chain carbohydrates in processed grains and cereals. Biesiekierski et al. (2011), J. Human Nutrition and Dietetics 24(2):154-176.
- Dietary sorbitol and mannitol: food content and distinct absorption patterns. Yao et al. (2014), J. Human Nutrition and Dietetics 27(Suppl 2):263-275.
- FODMAPs: food composition, defining cutoff values and international application. Varney et al. (2017), J. Gastroenterology and Hepatology 32(Suppl 1):53-61. Supplies the low, moderate and high cutoffs used on this page.
Last reviewed September 22, 2026.