energy balance write down four factors which contribute towards a healthy diet
TRANSCRIPT
Energy BalanceWrite down FOUR factors which contribute towards a healthy diet.
How many did you get right?Eat a variety of foodsEat a well balanced dietEat five portions of fruit and vegetables a day
Exercise regularly
OBJECTIVESUnderstand the different uses of
energy in the bodyDescribe the factors affecting
energy requirements.Define the concept of a balanced
diet
Food provides energy So the following can occur: Growth Repair Maintenanceof the bodyEnergy is measured in Kcal or K joules
Four Types of energy Mechanical,
muscles performing basic functions.
Chemical energy is respiration, when cells release energy from food.
Chemical Energy Chemical energy is
better known as respiration.
This is when a chemical reaction allows cells to release energy from food.
Metabolic rate is the speed which this occurs.
Heat Energy Your body takes
chemicals from food you eat and turns them into energy.
Heat is generated when this breakdown occurs.
Electrical energy This is energy
used by the nervous system.
Your sense organs contain receptors.
They create electric impulses used for reflex reactions.
Daily Energy requirements =BMR + Basic metabolic
rate. Number of
calories you need to stay alive.
This can vary between people
PAL Physical level
activity Number of calories
required to fuel physical activity
Dependent on the sports or activity you do
Energy balance =Energy input + Energy output
Test your understandingCan you describe what is a balanced diet using the following words? Energy input Energy output Kilo calories BMR
Different energy requirements
Young old
Metabolic differences
Female Male
Occupation
Sedentary job Active job
Life stage
Pregnancy Convalescence
Explain yourself In pairs you need to discuss and identifythree factors which affect our energy requirements.
Try and include the correct terminology in your answer.
How are energy requirements measured? DIETARY REFERENCE VALUES (DRVs) are
estimated requirements on population groups. ESTIMATED AVERAGE
REQUIREMENTS(EARs) is an average estimate for a certain group of people e.g. toddlers
LOWER REFERERENCE NUTRIENT INTAKE (LRNI) is an estimate for a group of people with low energy requirements e.g. the elderly.
