The First Week of April Is

National Sucrose Intolerance Week

Congenital Sucrase-Isomaltase Deficiency (CSID) may be more common than you think.


Sucrose Intolerance Due to Congenital Sucrase-Isomaltase Deficiency (CSID)

Congenital Sucrase-Isomaltase Deficiency (CSID) is a rare disorder that affects a person’s ability to digest sugars and starches due to absent or low levels of two digestive enzymes, sucrase and isomaltase.


CSID Symptoms Include...

bloating, abdominal pain, gas, chronic and frequent (daily) diarrhea, and nausea

bloating sucrose intolerance
abdominal pain sucrose intolerance
diarrhea symptoms sucrose intolerance

Experiencing these symptoms?

Marielle's Story

Being diagnosed as a teenager with Sucrose Intolerance due to Congenital Sucrase-Isomaltase Deficiency (CSID) has its own unique challenges. Marielle is choosing to share her personal story in order to help others who could be suffering from this condition.

Watch her videoGet Involved

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National Sucrose Intolerance Week - Four Myths Busted

To celebrate National Sucrose Intolerance Week, here are four health myths about the disease, debunked.

Flip the card to reveal the truth!

myth: easy to diagnose


It's easy to diagnose Sucrose Intolerance


Sucrose Intolerance is tricky to diagnose. Many of the symptoms – such as bloating, gas, stomach pain after eating, diarrhea, and constipation – are also present in other conditions such as irritable bowel syndrome


You can see how much sucrose is in common foods by reading the nutrition facts chart.


The nutrition facts chart shows the exact amount of sugar in grams, but there are many different types of sugar. Sugar can include sucrose, lactose (milk sugar), fructose (fruit sugar), glucose, maltose (a simple sugar broken down from starch), and galactose (a simple sugar broken down from lactose). You can only tell what kind of sugar is in a food by reading the ingredient list.

myth: you'll grow out of it


You'll just grow out of it.


Sucrose Intolerance is caused by a genetic mutation present from birth. Babies with the disease may not show symptoms until they start consuming formula or solid foods. Symptoms may become less severe in adults, but it's not possible to just grow out of the disease.



The low-FODMAP diet can reduce symptoms of Sucrose Intolerance.


The low-FODMAP diet was developed for people with irritable bowel syndrome. It is not recommended for people with Sucrose Intolerance because it's not a low-sucrose diet. People with sucrose intolerance who follow a low-FODMAP diet may still experience uncomfortable symptoms.

Get Involved


Celebrate National Sucrose Intolerance Week the first week of April to raise awareness about the unmet needs of people living with the condition.

People who have Sucrose Intolerance suffer from abdominal pain, gas, bloating, and diarrhea because they lack sufficient digestive enzymes to properly digest sucrose (table sugar) and starches found in many foods.

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Fast Facts about Sucrose Intolerance

Consider these quick facts about Sucrose Intolerance and learn why it may be more common than you think.