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Diet and exercise
Regular exercise and a balanced diet are needed to keep the
body healthy. Too little food leads to a person being underweight
and prone to illness, while too much food and not enough
exercise leads to a person being overweight and prone to other
illnesses. Excess cholesterol…

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contractions in the smooth wall of the gut which
move food through the alimentary canal ].

Metabolic rate
A healthy diet contains all the different nutrients in the correct amounts,
and provides the right amount of energy for each individual. An
unbalanced diet can lead to a person becoming malnourished.…

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Problems such as these are more likely to affect people in the
developing world, where it can be more difficult to get enough food.

Too much food
In warm weather, or when you don't do much exercise, you do not need
to eat as much food as when it is…

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Cholesterol is a substance found in the blood. It is made in the liver and
is needed for healthy cell membranes. However, too much cholesterol
in the blood increases the risk of heart disease, and of diseased
arteries.

Good and bad cholesterol
The bloodstream transports cholesterol around the body attached…

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Salt is found naturally in many kinds of food, but more is added by
food manufacturers and many people add even more when they are
eating. Processed foods often have a high proportion of salt and fat.
Salt added to food during processing accounts for about twothirds of
the average…

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