What is invert sugar, and is it worse than regular sugar?
Invert sugar is table sugar split into glucose and fructose. Why it is no worse than sugar, where it hides on Australian labels, and how much is too much.
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On this page
In short
- Invert sugar is table sugar split into glucose and fructose, and it is not worse than regular sugar because your gut makes the same split within minutes.
- Golden syrup, treacle and honey are partly or mostly inverted, while simple syrup and glucose syrup are not, and all of them count as free sugars.
- The WHO advises keeping free sugars under 10% of daily energy, ideally under 5%, which is about 25 g or 6 teaspoons a day.
From Vively member data
1.8 mmol/L
Rise with golden syrup
typical rise after meals that included it, 66 members
1.6 mmol/L
Rise with maple syrup
typical rise after meals that included it, 854 members
1.4 mmol/L
Rise with honey
typical rise after meals that included it, 2,656 members
Invert sugar is table sugar (sucrose) split into its two halves, glucose and fructose, using acid, heat or an enzyme. It is not worse for you than ordinary sugar, because your gut splits sucrose into the same glucose and fructose within minutes of eating it. Treat it like any added sugar: golden syrup, invert syrup and honey all count.
Invert sugar goes by several names on Australian ingredient lists, and some sweeteners people assume are inverted are not. Use this table as a label decoder.
| Name on the label | What it is | Inverted? |
|---|---|---|
| Invert sugar, invert sugar syrup, invert syrup | Sucrose split by acid or enzyme into glucose and fructose | Yes, fully or mostly |
| Golden syrup | A cane sugar refinery syrup; FSANZ lists 22 g fructose, 25.4 g glucose and 26.9 g sucrose per 100 g | Partly |
| Treacle | A darker refinery syrup; 15.2 g fructose, 14.1 g glucose and 39.7 g sucrose per 100 g (FSANZ) | Partly |
| Honey | Bees add an enzyme that splits nectar's sucrose; 40 g fructose and 31 g glucose per 100 g (FSANZ) | Naturally, mostly |
| Simple syrup (sugar and water) | Plain dissolved sucrose | No |
| Glucose syrup | Made from starch; glucose and longer chains, no fructose | No |
What is invert sugar?
Sucrose, the white sugar in your pantry, is one glucose molecule joined to one fructose molecule. Heating sucrose with a little acid, such as citric acid or cream of tartar, or adding the enzyme invertase, breaks that bond. The result is a syrup of free glucose and free fructose.
It is called "invert" because of how the syrup bends polarised light: sucrose turns it one way, the glucose and fructose mix turns it the other. The name describes chemistry, not anything about health.
Why food makers use it
- It stays smooth: free glucose and fructose crystallise less than sucrose, so fondants, fudge and ice cream stay soft.
- It holds water: cakes, biscuits and muesli bars stay moist for longer, which extends shelf life.
- It tastes sweeter: fructose is sweeter than sucrose, so a little goes further.
- It browns faster: golden syrup gives Anzac biscuits their colour and chew.
“By increasing the shelf life, you increase profits: but it is a disaster for our health and for our waist lines.”
Dr Michelle Woolhouse, Vively Medical Director
Is invert sugar bad for you?
Invert sugar is about as bad for you as the same amount of table sugar, no more and no less. The enzyme sucrase, on the lining of your small intestine, splits sucrose into glucose and fructose almost as soon as it arrives. By the time either sugar reaches your blood, your body cannot tell whether the split happened in a factory, a beehive or your gut.
The GI data agree. Table sugar averages 65 in the international GI tables and honey, which is mostly free glucose and fructose already, averages 61. The pre-split sugars do not behave like a faster sugar. We could not find a published GI for manufactured invert syrup in the international tables, so we do not give one.
The old version of this page said invert sugar causes sharper spikes and quoted harms appearing "in as little as 17 weeks". That came from a study in rats, and it did not show invert sugar to be worse than ordinary sugar in people. We have removed it.
The real issue is the amount
The problem with invert sugar is the same as with all added sugar: it comes in processed foods that are easy to eat in large amounts and low in fibre and protein. Half of every gram is fructose, which the liver handles. The WHO set its sugar limits because higher intakes of free sugars are linked with weight gain and tooth decay.
Where you will find invert sugar in Australia
You will mostly meet invert sugar in sweet packaged foods:
- Baking and biscuits: golden syrup in Anzac biscuits, ginger nuts, flapjacks and steamed puddings.
- Confectionery: fondant, soft lollies, chocolate fillings and marshmallow.
- Frozen desserts: ice cream and sorbet, to keep them scoopable.
- Bars and cereals: as a binding syrup in muesli bars and clusters.
- Drinks: some cordials and soft drinks; in acidic drinks part of the sugar slowly inverts on the shelf anyway.
On the label, the nutrition information panel shows total sugars, which includes invert sugar along with any natural sugars. There is no separate added sugars line in Australia: FSANZ looked at adding one and closed that proposal in March 2026 without a change. Read the ingredient list for the names in the table above.
What Vively members' glucose shows
Vively members who wear a continuous glucose monitor log meals, and the app records how far glucose rises in the two hours after eating. Here are meals that included a syrup, from a query we ran on 27 October 2026.
Meals that included golden syrup rose a typical 1.8 mmol/L, maple syrup meals 1.6 and honey meals 1.4. These are whole meals, so the porridge, pancakes or toast under the syrup count too, and golden syrup had the fewest members.
See the numbers as a table
| Value | Members | |
|---|---|---|
| Meals that included the syrup: Golden syrup | 1.8 | 66 |
| Meals that included the syrup: Maple syrup | 1.6 | 854 |
| Meals that included the syrup: Honey | 1.4 | 2,656 |
The differences are small, and the meals differ, so this does not show one syrup is better. Too few members logged golden syrup on its own to report, so we cannot compare the syrups head to head. What the data does show is that sugary meals with these syrups produce ordinary rises in most members, similar to many everyday foods on our glucose spikes hub. We compare the two most popular syrups in maple syrup vs honey, and honey alone in the glycaemic index of honey.
How much added sugar is too much?
The World Health Organization recommends keeping free sugars, which include invert sugar, golden syrup and honey, under 10% of daily energy and ideally under 5%, about 25 g (6 teaspoons) a day for an average adult. The Australian Dietary Guidelines advise limiting foods and drinks with added sugars.
“It is common to equate fullness with enough, but as we work towards optimising our metabolic health and immunity, we need to ask ourselves, did I just consume enough calories or did I consume enough nutrition?”
Dr Michelle Woolhouse, Vively Medical Director
Practical ways to cut back:
- Check the first three ingredients: if a sugar or syrup is among them, the product is mostly sugar.
- Compare total sugars per 100 g: it lets you compare two muesli bars or yoghurts fairly.
- Bake it yourself: you control the golden syrup, and most recipes cope with less.
- Do not swap one syrup for another: rice malt, agave, coconut sugar and invert syrup are all still free sugars.
If you want sweetness without sugar, we compare non-sugar options in sucralose vs stevia.
Is invert sugar a problem with diabetes or insulin resistance?
Count invert sugar exactly as you would table sugar or honey: as carbohydrate that raises blood glucose. If you have diabetes, your GP or dietitian can help you fit small amounts into meals. With insulin resistance, the body makes extra insulin to cope with every sugary load, often for years before glucose itself looks abnormal. A fasting insulin test shows that strain early, and your triglycerides and liver enzymes show how your liver is coping with your diet.
How Vively can help
Added sugar shows up in your blood test before it shows up as a diagnosis. The Baseline Health Check measures 70+ markers, including fasting insulin, HbA1c, triglycerides and liver enzymes, read against optimal ranges, from one blood draw at one of 3,700+ partner collection centres. A practitioner explains what your results mean for your diet, and your membership includes a targeted re-test after 3 months. If you would rather see your glucose response to the foods you eat, our CGM program pairs a 14-day sensor with the app and dietitian support.
The Baseline Health Check measures 70+ markers, including fasting insulin, triglycerides and liver enzymes, and a practitioner explains your results against optimal ranges.
Frequently asked questions
Is invert sugar bad for you?
No more than ordinary sugar. Your gut splits table sugar into glucose and fructose, which is exactly what invert sugar already is, so the effect on your body is the same gram for gram. Like all added sugar, it is best kept to small amounts, under the WHO limit of 10% of daily energy.
Is golden syrup an invert sugar?
Yes, partly. Golden syrup is a cane sugar refinery syrup in which some of the sucrose has been split. FSANZ lists 22 g fructose, 25.4 g glucose and 26.9 g sucrose per 100 g. It behaves like any other added sugar.
Is honey an invert sugar?
Honey is a natural invert sugar. Bees add the enzyme invertase to nectar, which splits most of its sucrose, so honey is mainly free fructose (40 g per 100 g) and glucose (31 g). It counts as a free sugar in the WHO and Australian guidelines.
Is invert sugar the same as high fructose corn syrup?
No, but they are similar. Both are mixes of free glucose and fructose. Invert sugar is made from cane or beet sugar and is about half fructose; high fructose corn syrup is made from corn starch, and the common HFCS-55 is 55% fructose. Neither is healthier than the other.
Is simple syrup an invert sugar?
No. Simple syrup is plain sugar dissolved in water, so it is still sucrose. Some cooks add lemon juice and simmer it, which inverts part of it, but the effect on your body is the same either way.
Sources
- Atkinson FS, Foster-Powell K, Brand-Miller JC. International tables of glycemic index and glycemic load values: 2008. Diabetes Care 2008;31(12):2281-2283. PMC2584181
- Food Standards Australia New Zealand. Australian Food Composition Database, Release 3
- Food Standards Australia New Zealand. Proposal P1058: nutrition labelling about added sugars (closed 23 March 2026)
- World Health Organization. Guideline: sugars intake for adults and children (2015)
- National Health and Medical Research Council. Australian Dietary Guidelines
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