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Nutrition And Metabolism

Introduction

Introduction

In this Chapter You'll Learn 


♦ roles of carbohydrates, proteins, and lipids in nutrition

♦ functions of vitamins and minerals in the body

♦ the way in which glucose is turned into energy

♦ role of hormones in metabolism.

Nutrition

Nutrition

Nutrition refers to the intake, assimilation, and utilization of nu-trients. The crucial nutrients in foods must be broken down intocomponents for use by the body. Within cells, the products of di-gestion undergo further chemical reactions.

Metabolism refers to the sum of these chemical reactions.Through metabolism, food substances are transformed into ener-gy or materials that the body can use or store.

Metabolism involves two processes:

anabolism—synthesis of simple substances into complex ones

catabolism—breakdown of complex substancesinto simpler ones or into energy.

Needed for Nutrition

Needed for nutrition

The body needs a continual supply of water and various nutrients for growth and repair. Virtually all nutrients come from digested food. The three major types of nutrients required by the body are carbohydrates,proteins, and lipids.

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