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Enzyme

By Shereen Jegtvig, About.com

Updated November 05, 2007

About.com Health's Disease and Condition content is reviewed by our Medical Review Board

Definition:
A specialized substance that acts as a catalyst to regulate the speed of the many chemical reactions involved in the metabolism of living organisms.

In nutrition, enzymes are substances that break down carbohydrates, proteins and fats for digestion and absorption.

Digestive enzymes include lipase that breaks down fats, amylase that breaks down sugars and carbohydrates, and protease that breaks down proteins.

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