Section 1

Nutrients

• The human body needs six nutrients—carbohydrates, proteins, lipids, vitamins, minerals, and water—to grow and function.

• Carbohydrates, found in foods such as breads, provide most of the body's energy. The body quickly processes monosaccharides. Cellulose cannot be digested but is needed for fiber.

• Proteins, found in foods such as meats, help the body grow and repair tissues. Essential amino acids must be obtained from foods.

• Lipids, found in foods such as oils, are used to build cell membranes.

• Vitamins act as coenzymes to enhance enzyme function.

• Minerals are inorganic substances used to build red blood cells and bones and for muscle and nerve functions.

• Water helps regulate body temperature and transports nutrients and wastes.

Vocabulary nutrient (p. 979)

dehydration (p. 984)

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