Nutrition - PE

The seven classes of food and their exercise related function - fats, proteins, carbohydrates, vitamins, fibre, minerals and water

The need for a balanced diet and the energy balance of food

The performer's use of nutritional information based on their activity, differecne in diet composition between endurance and power athletes

Definitions of obesity and the limitations of defining it

Percentage body fat/body composition and BMI as measures of nutritional suitability

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Specification (AQA)
Nutrition
The seven classes of food and their exercise-related function
­ fats, proteins, carbohydrates, vitamins, fibre, minerals and
water
The need for a balanced diet and the energy balance of food
The performer's use of nutritional information based on their
activity, difference in diet composition between endurance
and power athletes
Definitions of obesity and limitations in trying to define it
Percentage body fat/body composition and Body Mass
Index (BMI) as measures on nutritional stability…read more

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7 Classes of food -> Carbohydrates
Macronutrient
Provides energy for respiration
Main source of energy
Simple (release energy quickly e.g. chocolate) or
complex (release energy more slowly e.g. pasta)
Stored as glycogen in liver and muscles
Stored as fat in adipose tissue
Transported in blood stream as glucose
Level of glucose in the blood carefully controlled by
insulin…read more

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7 Classes of food -> Fat
Macronutrient
Provides energy, insulation and protection, carrier for fat
soluble vitamins
Can be saturated, monounsaturated and polyunsaturated
Oxidation of fat allows for slow energy release during low
intensity or prolonged activity
The body can make all the fatty acids it needs apart from
two essential fatty acids which must be supplied in the diet
Stored as triglycerides in adipose tissue
High fat intake (esp. saturated fat) leads to obesity and raised
blood cholesterol and increases risk of CHD…read more

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7 Classes of food -> Protein
Needed for growth and repair of tissues
Provides 10% of energy demands
Made of amino acids
Human body can produce some amino acids itself
(non-essential amino acids) but a certain number must
be supplied through protein in the diet (essential amino
acids)
Needed for the production of myoglobin and
haemoglobin which transport oxygen in the blood
Power athletes need protein in their diet for the repair
and growth of muscle tissue…read more

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7 Classes of food -> Fibre
Fibre is not absorbed in the small intestine so can act as
a bulking agent and prevent constipation
Helps reduce blood cholesterol levels
Helps control blood glucose levels
Major sources of dietary fibre are whole-grain and high-
fibre breakfast cereals…read more

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