1. Answer question 4 of the exam paper in the back of your books
STARTER
Answer question 4 of the exam paper in the back of your books
Title:
What is a healthy diet? What is our ‘metabolic rate?’
LO:
To list the food groups in a balanced diet
To measure the energy content of different foods

2. What are the six food groups?
RECAP
What are the six food groups?
Hands up!

3. The amount of energy needed to raise 1g of water by 1OC
Where are we now?
What is a calorie?
The amount of energy needed to raise 1g of water by 1OC

4. A calorimeter

5. Pasta contains 120 calories per 75g serving
Challenge your brain!
Raising a 100g mass in the air for 1 minute (this uses one joule (J) of energy)
1 J = O.2 calories
How much pasta can I eat if I work out at the gym lifting 100g weights for 25 minutes?
Pasta contains 120 calories per 75g serving

6. Challenge your brain!
Raising a 100g mass in the air for 1 minute uses about one joule (J) of energy
1 J = O.2 calories
How much pasta can I eat if I work out at the gym lifting 100g weights for 25 minutes?
Pasta contains 120 calories per 75g serving
25 minutes = 25 Joules
25X0.2 = 5 calories
120/75 = 1.6 calories per gram
5/1.6 = 3.125grams of pasta!
Looks like I might have to work a bit harder to eat a full meal!

7. Metabolic Rate:
People can have different energy requirements because they have a different metabolic rate.
Metabolic rate is the rate at which chemical reactions happen in the body.

8. Metabolic Rate:
People with a higher metabolic rate:
do more exercise (which increases muscle and has an effect on its own)
have more muscle (men – sadly!)
may have inherited it from their parents.
So they can eat more!