DIET AND NUTRITION
Food is obviously needed to sustain life but a
balanced diet is vital for good health. General evidence for good nutrition is
a well developed body with an ideal weight, good skin, including hair, and
muscle tone, and physical and mental alertness. The food eaten by an individual
constitutes the diet and it should supply appropriate amounts and proportions
of a variety of substances, usually called nutrients. Some nutrients, the
macronutrients, such as carbohydrates, lipids and proteins, are required in
amounts that are large compared with the micronutrients, such as vitamins,
minerals and trace elements, which are needed in much smaller quantities.
Nutrients are needed to sustain a number of activities within the body if good
health is to be maintained. They supply the raw materials required for growth
and maintenance of tissues, include substances that help regulate metabolism,
for example the cofactors and coenzymes necessary for enzyme activities and
provide the energy to drive metabolism and maintain homeothermy. Nutrients vary
in their contributions to these roles and there is also overlap between their
contributions to each (Figure 10.1).
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