Diet

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Diet
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By the end of todays lesson you will

• Understand why a healthy diet is so important.
• Have explored what makes up a healthy diet.
• Understand where different nutrients can be found
  and why we need them.

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Why is what we eat so important

• We need food for energy, growth, repair and good
  health.
• We get energy from food and the muscles use it to
  enable them to work.
• Food contains the materials and nutrients we need
  for growth and repair.
• Our bodies need lots of different nutrients to do
  lots of different jobs. Therefore we need a
  balanced and varied diet.

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What are the components of a balanced diet?

• Carbohydrates
• Fats
• Protein
• Vitamins
• Minerals
• Water
• Fibre

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Carbohydrates

• These are broken down into glucose to provide
  fast release energy.
• Some glucose is stored as glycogen in the liver
  and muscles.
• They provide approx 55 of our energy.
• They are found in foods such as

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Fats

• Fats are also used for energy, depending on the
  exercise you are doing.
• They release energy slower than carbohydrates.
• Approximately 30 of our energy comes from fats.
• Fat also provides us with insulation.
• Fat can be found in

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Carbohydrate or Fat????????

• Long walk mainly fat
• Slow Jog more glycogen
• Sprint glycogen only
• Jogging for a long time will use fat when
  glycogen starts to be used up
• Yahoo! Video Detail for running-machine.wmv
• The fitter you are the more you will burn fat
  instead of glycogen.

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Protein

• Protein is needed to build cells, make blood and
  repair muscles.
• You body can use protein for energy but only if
  fat and carbohydrate has run out.
• Proteins provide 15 of our energy.
• We get protein from

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Vitamins

• Vitamins help in the formation of body tissues
  and are necessary for all the chemical reactions
  in the body.
• The body only needs tiny amounts of vitamins.
• The important vitamins are A, C and D.

A
C
D
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Minerals

• Minerals are also important and only needed in
  small amounts.
• Without iron you blood cannot carry oxygen!
  (blood is red because it contains iron!!)
• Without calcium youd have no bones!!!!
• Minerals also help your body absorb the vitamins
  which you need.

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Water

• Water does not give you energy but is the main
  component of all your bodily fluids!
• If the level of water in your blood and body
  fluids is too low water from the cells is sucked
  out and these cells die.
• This is why it is important not to get dehydrated.

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Fibre

• High fibre foods provide little energy and cannot
  be digested.
• However they make you feel full up so you dont
  over eat.
• Fibre is a substance called cellulose and it is
  this which the body cannot digest.
• Fibre helps prevent bowel cancer and
  constipation.

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Task 1.

• As a class complete and stick into you books the
  analysing different foods chart.

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Task 2.

• Read and copy pages 102 103. It will build on
  what we have just talked about.
• Stick the Food Guide Pyramid into your books.