Treatment and Dietary Management
At a Glance
The primary treatment for Congenital Sucrase-Isomaltase Deficiency (CSID) combines sacrosidase enzyme replacement to digest sucrose with dietary management. Because sacrosidase does not break down starches, patients must carefully track food to determine their unique tolerance levels.
The goal of managing Congenital Sucrase-Isomaltase Deficiency (CSID) is to reach the most “liberal” diet possible—one that provides full nutrition and a high quality of life while keeping uncomfortable symptoms at bay [1]. Treatment generally focuses on two main pillars: dietary modification and enzyme replacement therapy (ERT) [2][1].
Enzyme Replacement Therapy: Sacrosidase
Sacrosidase (often known by the brand name Sucraid) is the primary medication for CSID [1]. It is a liquid enzyme that you take with every meal and snack [2].
- How it works: Sacrosidase acts as a “chemical tool” that breaks down sucrose (table sugar) into glucose and fructose, which your body can then absorb [1][3].
- The starch limitation: It is critical to understand that sacrosidase only helps break down sugar; it does not have the isomaltase enzyme needed to break down starches [2][4]. Because of this, even when taking the medication, many people must still limit their intake of starchy foods like bread, pasta, and potatoes to avoid symptoms [2][5].
- Storage and Handling: Sacrosidase is a delicate protein. It requires refrigeration and can be destroyed by high heat. It should be taken with cold or room-temperature liquids and never mixed into hot foods or beverages [3].
- Safety Warning: Because sacrosidase is derived from baker’s yeast and contains papain, it is contraindicated for patients with yeast, papain, or glycerin allergies due to the risk of severe allergic reactions [1]. Be sure to inform your doctor if you have these allergies.
- Accessing Medication: It is a highly specialized medication, meaning you will likely need to navigate insurance approvals and obtain it through a specialty pharmacy rather than your local drugstore.
Managing the Two Triggers: Sucrose and Starch
Because every person with CSID has a unique level of enzyme activity, there is no “one size fits all” diet [6][7].
| High Sucrose (Sugar) Triggers | High Starch Triggers |
|---|---|
| Table sugar, maple syrup | Potatoes, sweet potatoes |
| Apples, bananas, oranges | Rice, oats, corn |
| Fruit juices, sweetened drinks | Bread, pasta, crackers |
- Sucrose (Sugar) Management: This is often the first focus. With sacrosidase, many patients can reintroduce some fruits and naturally occurring sugars back into their diet [1][3]. Without the enzyme, a very strict low-sucrose diet is necessary to prevent diarrhea and bloating [1].
- Starch Management: Since starches are complex chains of sugars that require isomaltase to break down, they can be more difficult to manage [2]. Some patients may find they can tolerate small amounts of “well-cooked” starches (like white rice) better than others, while some must follow a strict starch-restricted diet [2][4]. Cooking starches longer physically breaks down the complex carbohydrate structures, making them slightly easier for the body to process [2].
The Process of Liberalization
“Liberalizing” the diet means slowly and carefully adding foods back in to find your personal threshold for symptoms [1].
- Step 1: Stabilization. Start with a simple diet of “safe” foods (such as plain meats, eggs, and specific safe fats) to let the gut heal and symptoms subside [1][5].
- Step 2: Introduction. Add one new food at a time in a small amount while using your enzyme replacement.
- Step 3: Observation. Wait 24–48 hours to see if symptoms like gas or bloating return [5].
- Step 4: Keep a Food Diary. Keeping a detailed log of the foods you eat and any subsequent symptoms is the gold-standard method for identifying your unique starch and sucrose tolerance thresholds.
Practical Tips for Families
- Consistency is Key: Sacrosidase must be used with every meal and snack that contains sucrose [2]. Missing even a small snack can lead to breakthrough symptoms.
- Watch the Hidden Sugars: Sucrose is hidden in many unexpected places, such as liquid medications, vitamins, and salad dressings [1].
- Starch-Free Trials: If symptoms persist even while taking sacrosidase, a temporary starch-free trial can help determine if starches (rather than sugars) are the culprit [2].
- Growth Monitoring: For children, the dose of sacrosidase is based on weight for smaller children (typically under 15kg/33lbs), but transitions to a standard fixed dose for older children and adults.
Next steps: Living Well with CSID
Common questions in this guide
How does sacrosidase work for CSID?
Why do I still have symptoms while taking my CSID medication?
How should I store and take my sacrosidase medication?
How do I figure out which foods trigger my CSID symptoms?
Questions to Ask Your Doctor
Curated prompts to bring to your next appointment.
- 1.Based on my weight (or my child's weight), what is the correct dosage for sacrosidase, and how often should we re-evaluate it as growth occurs?
- 2.Since sacrosidase does not help with starch digestion, how much starch should I be restricting in my (or my child's) diet?
- 3.What are the signs that we need to increase the enzyme dose versus making further dietary restrictions?
- 4.Are there specific liquids or foods we should avoid mixing sacrosidase with to ensure it remains effective?
- 5.How do we determine if residual symptoms like bloating or gas are caused by starch intolerance or something else entirely?
Questions For You
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References
References (7)
- 1
Demystifying Carbohydrate Maldigestion: A Clinical Review.
Cash BD, Patel D, Scarlata K
The American journal of gastroenterology 2025; (120(4S)):1-11 doi:10.14309/ajg.0000000000003374.
PMID: 40249016 - 2
Genetic and acquired sucrase-isomaltase deficiency: A clinical review.
Danialifar TF, Chumpitazi BP, Mehta DI, Di Lorenzo C
Journal of pediatric gastroenterology and nutrition 2024; (78(4)):774-782 doi:10.1002/jpn3.12151.
PMID: 38327254 - 3
Congenital sucrase-isomaltase deficiency: diagnostic challenges and response to enzyme replacement therapy.
Puntis JW, Zamvar V
Archives of disease in childhood 2015; (100(9)):869-71 doi:10.1136/archdischild-2015-308388.
PMID: 26163121 - 4
Genetic sucrase-isomaltase deficiency: epidemiology, clinical spectrum, and diagnostic challenge.
Demir E, Tunç A, Başer B, et al.
Scandinavian journal of gastroenterology 2026; (61(3)):268-276 doi:10.1080/00365521.2026.2615396.
PMID: 41524269 - 5
The patient journey to diagnosis and treatment of congenital sucrase-isomaltase deficiency.
Smith H, Romero B, Flood E, Boney A
Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation 2021; (30(8)):2329-2338 doi:10.1007/s11136-021-02819-z.
PMID: 33772704 - 6
Molecular pathogenicity of novel sucrase-isomaltase mutations found in congenital sucrase-isomaltase deficiency patients.
Gericke B, Amiri M, Scott CR, Naim HY
Biochimica et biophysica acta. Molecular basis of disease 2017; (1863(3)):817-826 doi:10.1016/j.bbadis.2016.12.017.
PMID: 28062276 - 7
Differential Effects of Sucrase-Isomaltase Mutants on Its Trafficking and Function in Irritable Bowel Syndrome: Similarities to Congenital Sucrase-Isomaltase Deficiency.
Husein DM, Rizk S, Naim HY
Nutrients 2020; (13(1)) doi:10.3390/nu13010009.
PMID: 33375084
This page explains treatment and dietary strategies for CSID for educational purposes only. Always consult your doctor or a registered dietitian before starting new medications or altering your diet.
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