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Contents
8A Food and Digestion
A balanced diet
The digestive system
Digestive enzymes
Summary activities
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Why do we need food?
Humans need to consume a balanced diet
which contains a variety of different types
of food.
The main nutrients the body needs are:
carbohydrates for energy;
proteins for growth and repair;
fats to store energy;
vitamins and minerals to keep the body healthy.
The amount of each food type needed is related to the
proportions in the food pyramid.
Which food type does the body need the most of?
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Nutrients in food
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What is a balanced diet?
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What are carbohydrates?
Starchy foods contain carbohydrates which are made of
long chains of identical small sugar molecules.
carbohydrate
one sugar
molecule
molecule
The long chains of carbohydrates are broken down into the
smaller sugar molecules by the body.
The small molecules from carbohydrates are used by the
body to release energy and make the body work.
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