|All carbohydrates have the general
formula Cn(H2O)n. Most foods contain carbohydrates, which
the body breaks down into simple sugars for use as a readily available
source of energy. For example, glucose is used immediately by the brain
and muscles and the excess is stored as glycogen or fat for future
||Protein molecules play an important
role in the structure of the body. Protein materials make up the muscles,
cartilage, ligaments, skin and hair. Antibodies, enzymes and hormones
are vital in maintaining the body's functions.
||Lipids are made of hundreds of fatty
acids. Fatty acids are important as carriers of fat-soluble vitamins.
Lipids are also a concentrated energy source, transporting energy as
well as storing it in fat cells.