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Enzyme

By , About.com Guide

Updated November 05, 2007

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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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