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Food
Food is a substance that when processed and broken down can supply the
body with materials:
from which energy can be released
for growth and repair
Humans and animals rely on organic substances made by plants to provide
themselves with energy ­ this makes us heterotrophs
Whereas plants who use inorganic substances to construct organic
substances like carbohydrates and proteins to provide energy are called
autotrophs
Foods are made up of a combination of components known as nutrients. Each of
these components have a function and many foods can be found that are
rich in these nutrients. Nutrients can be broken down during digestion in the
body.
A balanced diet provides all the necessary components needed to maintain a
good health, and the proportion of each component for every person differs
due to differences in age, physical activity and gender. Good nutrition will
provide us with a better health.…read more

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7 components of a balanced diet
There are 7 food types in a balanced diet:
Carbohydrates
Fats (Lipids)
Proteins
Vitamins
Mineral
Water and fibre are not considered as
nutrients as they are not digested by the body
Water but are still needed by the body to stay in
good health.
Fibre…read more

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Component Function/Role Good Sources
Carbohydrates Provides energy quickly and about 60% of our These include pasta, breads, rice , potatoes,
diet should comprise of carbohydrates breakfast cereals and pulses
Lipids Provide essential fatty acids important in making Can be found in dairy products, red meat,
cell membranes and steroid hormones, lipids plant oils and oily fish
provide energy when broken down, fats provide
twice as much energy as carbohydrates or
proteins hence should make up about 25 % of
our diet
Proteins Important for the formation of new cells and Good sources include eggs, fish, meats and
tissues including haemoglobin, collagen and dairy products, nuts, pulses and poultry
enzymes. Provide essential amino acids for
growth and replacement of tissues and also may
provide energy.
Builds and repairs muscle
Vitamins To regulate metabolic processes Citrus fruits such as oranges, and potatoes.
Minerals These inorganic ions may be used for growth Red meats, green vegetables are good
and repair and to regulate metabolic processes sources of iron
e.g. iron is needed to the formation of Most dairy products like milk and cheese are
haemoglobin and transporting oxygen in the good sources of Calcium
body, a lack of this shows as fatigue
Water Maintains fluid levels helps transport substances Taps, water bottles the obvious
around the body about 60 percent of the human
body is water
Fibre Fibre is indigestible but ensures that the Wholemeal bread, wholegrain cereals, bran
digestive system is healthy and functions and fresh fruit.
properly.…read more

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Quiz
What is the importance of iron?
Which two components are not considered nutrients and why?
Thinking back to biological molecules, what two things can carbohydrates
such as polysaccharides be hydrolysed in to?
In addition casting you minds back to about half an hour ago, name three
types of food that can help lower your cholesterol levels
Define the term balanced diet…read more

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