Fiber is a non-digestible carbohydrate categorized as a Non-Digestible Carbohydrate (NDC). It must meet specific requirements to be classified as dietary fiber, including a chemical composition of three or more monomeric units and a lack of digestibility by human enzymes. There are two types of fiber: soluble, which dissolves in water and has various health benefits, and insoluble, which adds bulk to stool and aids digestion. Although fiber is technically a carbohydrate with 4 calories, its caloric value is often considered negligible due to its inability to be digested.
Fiber is categorized as a non-digestible carbohydrate (NDC), which means it typically does not contribute calories in the same way digestible carbs do.
Soluble fiber dissolves in water, creating a gel-like substance in the gut, which slows digestion, stabilizes blood sugar, and binds cholesterol.
Insoluble fiber, on the other hand, does not dissolve in water, but it promotes digestive health by adding bulk to stool and aiding its movement through the digestive tract.
Despite being a carbohydrate that is generally associated with 4 calories per gram, the caloric contribution of fiber is often considered negligible due to its non-digestibility.
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