GLOSSARY

Disaccharidase splits a specified disaccharide into smaller sugars according to substrate specificity.

Amylase breaks starch into smaller fragments, followed by brush-border completion to absorbable sugars. It does not cleave every branch or every fiber. Simple sugars differ: monosaccharides are already small, whereas disaccharides still need appropriate enzymes. In sport, intake rate and carbohydrate mixtures must fit tolerance. The word complex alone does not determine digestion speed because processing and food structure also influence accessibility.

Lactase splits lactose into glucose and galactose; sucrase yields glucose and fructose from sucrose. Maltase activity within brush-border enzyme complexes helps release glucose, while isomaltase handles particular branched linkages. These functions complement one another rather than naming an interchangeable universal enzyme. Tolerance of one sugar does not determine whether every carbohydrate is suitable, and a product must be matched to its actual substrate.

Brush-border enzymes on the lumen-facing intestinal surface complete particular digestive steps; not all digestive enzymes float freely in juice. Small products then enter through suitable routes. Reduced enzyme activity can alter tolerance of a specific substrate, but symptoms overlap. Discomfort after a meal does not identify the faulty enzyme or transporter by itself, and more enzyme activity is not automatically needed in healthy digestion.

A digestive enzyme accelerates particular reactions according to bond type, environment and substrate access. One enzyme cannot necessarily break every food component. Some are made as precursors and activated later to limit inappropriate injury. Separate normal physiology from supplement effects: an enzyme's presence in the body does not itself prove that additional intake improves digestion or sports performance in someone without a relevant deficiency.

Intestinal glucose and galactose uptake uses sodium-linked transport, while fructose uses a different carrier. Exit toward blood is another step. Combining transport routes can assist fueling during prolonged exercise, but abruptly increasing intake can provoke symptoms. Transport capacity, dose and individual experience matter. Naming a transporter is not permission for unlimited sugar or proof that every carbohydrate mixture improves performance without prior practice.

For sports use, consider meal size and timing together with fluids, intensity and composition. Large, fiber-rich or fatty meals close to exercise trouble some individuals, but tolerance varies. Changing one factor during training and recording responses helps identify patterns. First-time competition products or broad food exclusions without a replacement plan do not substitute for this practical evaluation and can compromise adequate fueling.