Understanding Sugars: The CSID Guide
When managing CSID, the word “sugar” is not just one thing. Carbohydrates and sugars come in many different shapes and sizes. How a sugar is physically shaped determines whether your body can digest it safely, or if it will trigger a flare.
In biology, sugars are classified by how many molecules are linked together. Think of them like building blocks.
Monosaccharides (The “Single” Sugars)
“Mono” means one, and “saccharide” means sugar. These are single, isolated sugar molecules.
Because they are already in their simplest possible form, your body does not need any enzymes to break them apart. They are absorbed directly through the intestinal wall and into your bloodstream. For someone with CSID, monosaccharides are generally safe to digest, though they come with their own dietary warnings (like rapid blood sugar spikes).
Learn more about individual Monosaccharides:
Disaccharides (The “Double” Sugars)
“Di” means two. A disaccharide is created when two monosaccharides are bound together.
Your body cannot absorb a double sugar directly. In order to digest it, your small intestine must produce specific enzymes to act as “chemical scissors,” snipping the bond that holds the two sugars together.
If you have a deficiency in a specific enzyme (like sucrase), the bond cannot be broken. The whole, undigested disaccharide travels into the large intestine where it ferments and causes gastrointestinal symptoms.
Learn more about individual Disaccharides:
Polysaccharides (Complex Carbohydrates / Starches)
“Poly” means many. Polysaccharides are massive chains made up of a large number of glucose molecules joined together.
Because of their massive structure, polysaccharides must be ripped apart by several different enzymes (including amylase and isomaltase) into smaller pieces before they can be digested. During this process, they are broken down into disaccharides like maltose, which can trigger symptoms in those with enzyme deficiencies.
Learn more about Polysaccharides: