How Does CSID Differ from Lactose Intolerance?
Congenital Sucrase-Isomaltase Deficiency (CSID) is similar to lactose intolerance, a well-known carbohydrate malabsorption condition, although the two conditions are treated differently. The table below compares CSID to lactose intolerance.
LACTOSE INTOLERANCE | CSID |
---|---|
Lactose intolerance is the small intestine's inability to digest lactose due to a lack of the enzyme lactase. | CSID is the small intestine's inability to digest sucrose due to a lack of the enzyme sucrase. |
Lactose is a type of carbohydrate found in milk and other dairy products. | Sucrose is a type of carbohydrate, commonly referred to as table sugar, and is naturally found in many fruits and vegetables. Sucrose is a common additive in many processed foods. |
Ingestion of milk sugars causes gastrointestinal symptoms similar to those in CSID. | Ingestion of sucrose causes gastrointestinal symptoms, most commonly diarrhea, bloating, abdominal pain, or gas. |
Lactose intolerance is typically not caused by a genetic mutation and is very common. There is a rare form of lactose intolerance present at birth known as congenital lactose deficiency, which is caused by a genetic mutation. | CSID is caused by a mutation of a gene in chromosome 3, producing a deficiency of sucrase enzymatic activity, making the body unable to digest sucrose. |
Lactose intolerance is considered very common, excluding the rare congenital lactose deficiency. | CSID is a rare disease. |
Onset can occur at any age, excluding the rare congenital lactose deficiency, which is present at birth. | CSID is congenital, or present at birth. |