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TOPIC 2 - NUTRITION 
Understand percentage body fat/body composition and body max index (BMI) as ways of measuring 
whether a persons diet is nutritionally healthy for them 
Understand definition of obesity and the limitations to defining it 
Learning Outcomes: 
A – Attempt exam questions using 
notes to Support answers 
B – Define Obesity and Explain what 
and why there are limitations 
C – Define and Understand the 
terms of BMR, BMI and Percentage 
Body Fat 
Do Now Task – Attempt the questions on the hand 
out
ENERGY 
Humans like all living beings need to get energy from somewhere. 
We use the chemical energy that we can extract from food. 
We oxidise food to produce energy, carbon dioxide and water. 
oxidation 
Food Energy, CO2, Water 
The actual amount of energy we need will vary from person to 
person and is dependant on their Basel Metabolic Rate and how 
much activity they do
BMR – BASEL METABOLIC RATE 
How quickly the body uses up energy to complete the basic bodily functions. 
Therefore it is different for every body. 
Infants and young people have high BMR’s in relation to their size due to how 
quick they grow and develop. Men have a higher BMR due to more muscle. 
BMR is ¾ of your energy needs. 
Level of activity and body weight are all factors of the amount of energy a person 
requires. High levels of activity allow a person to consume more energy without 
gaining weight
PERCENTAGE BODY FAT 
Body weight is a good guide into a person energy balance. Balanced energy is 
delivered though equal energy input (food) to output (activity). 
Any excess intake of energy above what is needed daily is stored in the body as 
fat. 
Body mass is made up of 2 things. Lean body mass (muscles, bones and organs) 
and body fat. 
Average men 10-20% body fat, women 15-25% body fat. A person who is very fat 
will have a percentage body fat higher than these norms
PERCENTAGE BODY FAT CONT. 
Percentage Body fat can be measured in a number of ways. 
Skin Fold Test – Measure specific sections of skin around the body. 
This is then compared to relative norm tables. 
Problems with this? 
Dependant on the accuracy of the person measuring 
Bioelectrical Impedance Method – A device has your age, gender, height and weight put 
into it. Then electricity is passed though you from one electrode to the other and a 
reading is calculated 
Most effective way is to be submerged in water and measure how much water is lost
OBESITY – A PERSONS BODY FAT PERCENTAGE IS 
HIGHER THAN 40% 
A condition where excess fat accumulation can impair health. 
A BMI of over 30 is also deemed obese as well the percentage body 
fat limit of 40%. 
It is a symptom not a measurable quantity so it becomes difficult to 
define. 
If energy intake is higher that output regularly, weight will be 
gained leading to obesity.
BMI – BODY MASS INDEX 
This is used to judge whether a person is the correct weight for their height. 
Weight/height (squared) = BMI 
Kg/M2 = BMI 
There is a strong relationship between BMI and the risk of associated diseases 
What are some of the issues with this?
INDEPENDENT TASK 
Use page 18-20 do design a pamphlet that warns being people of 
the risks of becoming over weight and obese. 
It has to include the following keywords/information 
• Obesity related diseases 
• Reasons for weight loss/gain 
• Activity Levels 
• Issues with being overweight 
• Prevention of obesity 
• Moderate activity 
• Intensity 
• Obese 
• BMI 
• BMR 
• Statistics on obesity 
• Activity Levels adults/children
QUESTIONS 
Attempt your Do Now questions again.

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  • 1. TOPIC 2 - NUTRITION Understand percentage body fat/body composition and body max index (BMI) as ways of measuring whether a persons diet is nutritionally healthy for them Understand definition of obesity and the limitations to defining it Learning Outcomes: A – Attempt exam questions using notes to Support answers B – Define Obesity and Explain what and why there are limitations C – Define and Understand the terms of BMR, BMI and Percentage Body Fat Do Now Task – Attempt the questions on the hand out
  • 2. ENERGY Humans like all living beings need to get energy from somewhere. We use the chemical energy that we can extract from food. We oxidise food to produce energy, carbon dioxide and water. oxidation Food Energy, CO2, Water The actual amount of energy we need will vary from person to person and is dependant on their Basel Metabolic Rate and how much activity they do
  • 3. BMR – BASEL METABOLIC RATE How quickly the body uses up energy to complete the basic bodily functions. Therefore it is different for every body. Infants and young people have high BMR’s in relation to their size due to how quick they grow and develop. Men have a higher BMR due to more muscle. BMR is ¾ of your energy needs. Level of activity and body weight are all factors of the amount of energy a person requires. High levels of activity allow a person to consume more energy without gaining weight
  • 4. PERCENTAGE BODY FAT Body weight is a good guide into a person energy balance. Balanced energy is delivered though equal energy input (food) to output (activity). Any excess intake of energy above what is needed daily is stored in the body as fat. Body mass is made up of 2 things. Lean body mass (muscles, bones and organs) and body fat. Average men 10-20% body fat, women 15-25% body fat. A person who is very fat will have a percentage body fat higher than these norms
  • 5. PERCENTAGE BODY FAT CONT. Percentage Body fat can be measured in a number of ways. Skin Fold Test – Measure specific sections of skin around the body. This is then compared to relative norm tables. Problems with this? Dependant on the accuracy of the person measuring Bioelectrical Impedance Method – A device has your age, gender, height and weight put into it. Then electricity is passed though you from one electrode to the other and a reading is calculated Most effective way is to be submerged in water and measure how much water is lost
  • 6. OBESITY – A PERSONS BODY FAT PERCENTAGE IS HIGHER THAN 40% A condition where excess fat accumulation can impair health. A BMI of over 30 is also deemed obese as well the percentage body fat limit of 40%. It is a symptom not a measurable quantity so it becomes difficult to define. If energy intake is higher that output regularly, weight will be gained leading to obesity.
  • 7. BMI – BODY MASS INDEX This is used to judge whether a person is the correct weight for their height. Weight/height (squared) = BMI Kg/M2 = BMI There is a strong relationship between BMI and the risk of associated diseases What are some of the issues with this?
  • 8. INDEPENDENT TASK Use page 18-20 do design a pamphlet that warns being people of the risks of becoming over weight and obese. It has to include the following keywords/information • Obesity related diseases • Reasons for weight loss/gain • Activity Levels • Issues with being overweight • Prevention of obesity • Moderate activity • Intensity • Obese • BMI • BMR • Statistics on obesity • Activity Levels adults/children
  • 9. QUESTIONS Attempt your Do Now questions again.