Sucrose intolerance is managed through a combination of dietary changes, enzyme supplements, and treating any underlying condition that may be causing it. The approach depends on whether your intolerance is genetic (congenital sucrase-isomaltase deficiency, or CSID) or acquired from gut damage. Most people see significant symptom relief once they identify their trigger foods and find the right enzyme support.
What Happens in Sucrose Intolerance
Your small intestine normally produces an enzyme called sucrase-isomaltase that breaks table sugar (sucrose) into simpler sugars your body can absorb. When this enzyme is missing or reduced, undigested sucrose travels to your colon, where gut bacteria ferment it. That fermentation produces gas, bloating, cramping, and often watery diarrhea.
The genetic form, CSID, is typically recognized when infants are weaned from breast milk or formula to foods containing table sugar. But milder genetic variants can go undiagnosed well into adulthood. Secondary sucrose intolerance can develop when conditions like celiac disease, small intestinal bacterial overgrowth (SIBO), or infections damage the intestinal lining where the enzyme is produced. In secondary cases, the intolerance often improves once the underlying condition is treated and the gut lining heals.
Dietary Changes: The Foundation of Treatment
Restricting sucrose and, in many cases, starch is the cornerstone of managing this condition. The sucrase-isomaltase enzyme doesn’t just digest table sugar. It also plays a major role in breaking down starch, which is a more complex form of sugar. Many people with sucrose intolerance find that starchy foods like bread, pasta, potatoes, and rice also cause symptoms, especially if their enzyme levels are very low.
The typical approach starts with an elimination phase: removing sucrose and starch from your diet and watching for symptom improvement. This alone can provide strong diagnostic clues before formal testing. Once symptoms settle, you gradually reintroduce foods one at a time to find your personal tolerance threshold. Some people can handle small amounts of certain starches but not others. Cooked and cooled starches, for instance, behave differently in the gut than freshly cooked ones.
For many people with CSID, some degree of sucrose and starch restriction is lifelong, though the specifics vary widely. Some tolerate moderate amounts of well-cooked starch with enzyme support, while others need to stay quite strict.
Spotting Sucrose on Food Labels
Sucrose hides under dozens of names on ingredient lists. The obvious ones are table sugar, cane sugar, beet sugar, and brown sugar. Less obvious sources include coconut sugar, turbinado sugar, demerara sugar, confectioner’s sugar, powdered sugar, raw sugar, golden sugar, muscovado, and saccharose (which is simply the chemical name for sucrose). Caramel, molasses, treacle, and maple syrup also contain significant sucrose.
Not every sweetener on a label is a problem. Glucose (dextrose) and fructose on their own are absorbed through different pathways and don’t require sucrase. However, many processed foods combine multiple sugar types, so reading every label carefully becomes a necessary habit. Fruits naturally contain sucrose alongside glucose and fructose, with some fruits (like dates, peaches, and mangoes) being higher in sucrose than others (like grapes and berries).
Prescription Enzyme Replacement
The prescription treatment for sucrose intolerance is sacrosidase, sold as Sucraid. It’s an oral solution containing a yeast-derived enzyme that breaks down sucrose in place of your missing or deficient natural enzyme. The dosing is weight-based: children weighing 33 pounds (15 kg) or less take 1 mL (about 28 drops) mixed into 2 ounces of water, milk, or formula with each meal or snack. Anyone over 33 pounds takes 2 mL (56 drops) in 4 ounces of liquid.
Timing matters. You take half the dose at the beginning of the meal and the other half partway through. This ensures the enzyme is present throughout digestion as sucrose enters the small intestine. You need to take it with every meal and snack that contains sucrose, not just once a day.
Sacrosidase requires refrigeration between 36°F and 46°F (2°C to 8°C) and must be discarded four weeks after opening due to the risk of bacterial growth. It also needs to be protected from heat and light, which makes traveling with it somewhat inconvenient.
One important limitation: sacrosidase breaks down sucrose effectively but does not help with starch digestion. Because sucrase-isomaltase normally plays a dual role in digesting both sucrose and starch, people with CSID may still experience symptoms from starchy foods even while taking sacrosidase. Animal research has shown that supplementing with a separate starch-digesting enzyme (glucoamylase) can correct the starch maldigestion that sacrosidase leaves unaddressed, though this is not yet a standard part of treatment.
Over-the-Counter Invertase: A Lower-Cost Option
Sacrosidase is extremely expensive, with yearly costs estimated at over £51,000 (roughly $65,000) in one study. This has led researchers to investigate invertase, an over-the-counter enzyme supplement that performs the same basic function of splitting sucrose into its component sugars.
A cohort study in pediatric patients found that invertase resolved symptoms completely in 44% of patients and partially improved symptoms in another 44%. Diarrhea specifically resolved or significantly improved in 89% of patients treated with invertase. The estimated yearly cost was around £1,972, a fraction of the sacrosidase price. Researchers concluded that invertase is an effective and cost-efficient alternative, though the study was small and conducted in a pediatric population.
Invertase supplements are available without a prescription at health food stores and online. However, the quality and potency of over-the-counter enzyme products vary between brands, and there’s no standardized dosing the way there is for sacrosidase. If you’re considering this route, working with a provider who can help you find the right dose and monitor your response is worthwhile.
Treating Secondary Causes
If your sucrose intolerance developed after a period of normal digestion, there may be an underlying condition damaging your intestinal lining. Celiac disease, SIBO, inflammatory bowel disease, and severe gastroenteritis can all reduce sucrase activity by injuring the cells that produce it. In these cases, treating the root cause often restores enzyme production over time.
For celiac disease, a strict gluten-free diet allows the intestinal villi to regenerate, which typically brings enzyme levels back toward normal over weeks to months. For SIBO, antibiotic treatment to reduce bacterial overgrowth in the small intestine can improve carbohydrate digestion once the bacterial load is controlled. The timeline for recovery varies, but many people with secondary sucrose intolerance find they can gradually tolerate more sucrose as their gut heals.
How Sucrose Intolerance Is Confirmed
If you suspect sucrose intolerance but haven’t been formally diagnosed, the two main testing approaches are a breath test and a small intestinal biopsy. The breath test measures hydrogen and methane in your breath after you drink a sucrose solution. Bacteria fermenting undigested sucrose in your gut produce these gases, which are absorbed into your bloodstream and exhaled. A rise of more than 20 parts per million above your baseline reading is considered a positive result.
Breath tests have limitations, though. A positive result can also be caused by SIBO or unusually fast intestinal transit, so it’s not perfectly specific to sucrose intolerance. The gold standard is a disaccharidase assay from a small intestinal biopsy, which directly measures enzyme activity. Some providers start with a simpler approach: eliminating sucrose from your diet for a trial period and observing whether symptoms improve. If they do, that provides a strong initial signal before pursuing formal testing.