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GCSE PE Nutrition

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on 29 June 2014

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Transcript of GCSE PE Nutrition

To explain the importance of macro nutrients.

To explain the importance of micro nutrients.

Learning Objectives
Macronutrients are nutrients that provide calories or energy. Nutrients are substances needed for growth, metabolism, and for other body functions.

Since ‘macro’ means large, macronutrients are nutrients needed in large amounts.

There are three macronutrients:
• Carbohydrate
• Protein
• Fat

While each of these macronutrients provides calories, the amount of calories that each one provides varies.
Macro Nutrients
Fat has 3 functions:
It provides our body with slow release energy;
It keeps us warm and insulated;
It allows the absorption of vitamins and minerals into the body.

Fat provides very slowly released energy.

This is important for endurance activities such as continuous running.

The longer you work the more fat is used and you must be working at approximately 50% of your MHR to enter the ‘fat burning zone’.

The fitter you are the more easily your body uses up stores of fat.
GCSE PE Nutrition
Your Personal Health and Wellbeing
In the lead up to an endurance event (e.g. Marathon) athletes follow a strict carbohydrate diet to store the energy source within the liver and muscle

The night before the event many athletes have ‘pasta parties’.

Carbohydrates are released slowly during endurance events rather than sugar which is released quickly.

This energy keeps athletes going for the whole endurance event.
Carbo Loading
Protein helps us grow and repair muscle tissue

Weight lifters and athletes using a lot of strength and power often tear micro fibres in their muscles which need repairing

Therefore their diet is very high in protein.

Injured athletes also rely heavily on protein diets
Good Fats
Success Criteria

To explain the importance, and use, of macro nutrients (carbohydrates, fats and protein)

To explain the importance of micro nutrients (minerals and vitamins), water and fibre for personal health and well-being, and maintaining a healthy, active lifestyle
Carbohydrates provide the body with energy

They are the most important food for athletes and people leading active lifestyles.

Once eaten, they are stored in the liver and muscle in the form of glycogen.

Carbohydrates are then broken down into glucose which is released into the blood stream
This glucose is the fuel used for energy.

Examples: Fish, meat, eggs, dairy products and nuts.
Vegetarians can struggle by becoming weak and it can even prevent recovery, so they should seek advice from a Doctor.
Bad Fats
Plant fats

These are good fats and are liquid form.
For example, vegetable oil, corn, soya
Animal fats

These are bad fats and are solid.
For example, butter, lard, cheese.

Micronutrients are nutrients that our bodies need in smaller amounts, and include vitamins and minerals.
Vitamins help the body grow and function properly.
Vitamin A
Keeps the skin healthy
Maintains good eyesight
Helps night vision
Vitamin C
Keeps skin and gums healthy
Prevents scurvy
Helps heal wounds
Vitamin D
Keeps bones and teeth strong
Prevents rickets
Helps body absorb calcium
Body produces vitamin D in the sun
Minerals also help the body grow and function properly.
Helps transport oxygen around the body through increasing haemoglobin in red blood cells and prevents anaemia.
Keeps teeth and bones healthy
Helps muscular contractions.
Needed for thyroid hormone regulation which regulates energy.

The human body is made up of % water.

We lose litres a day through , and breathing so this must be replaced.

When the body loses even more water, increasing the risk of .

Symptoms of include:

Homework: effects of exercise on dehydration.

2-3 Litres



It is essential to drink small amounts of fluids at regular intervals.
Fibre aids intestinal digestion – helps to pass other waste products out of the body.

Fibre is indigestible plant material, which gives the gut bulk, against which the muscles can push.

This helps prevent constipation.
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