Y8 Cover lesson on Energy in Food

Y8 Energy in food calculations

​Requirements:
1. Calculator
2. Exercise book
3. Stationery

Most people enjoy eating foods that are sweet, fatty or salty. Consuming too much of these can lead to obesity and ill health.

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​Introduction

Task 1: Watch the video and, give two points on whether you agree/disagree with the doctor that obesity is a brain disease

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Open Ended

Do you agree that obesity is a brain disease or it is just about people making poor choices? Justify your ideas(at least two points)

We can calculate how much food you need. What you need to know is that, the daily energy requirement for a student is 8000KJ per day. Out of that, 60% should be carbohydrates and 30% should be fat, while 10% should be protein. Now let's calculate!

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​Food calculations

Example question

How much mass of carbohydrate should you eat each day if each gram supplies 16 KJ of energy?J?

Mass of food = (%of food/100 x energy needed per day)/energy supplied

= (60/100 x 8000)/16

= 300KJ

Try these questions in your exercise book

Task 2: Fat supplies 37KJ per gram. How much fat would you need to eat to get 40% of your daily energy requirements?

Task 3: Protein releases 16KJ per gram. How much protein would you need to eat to get 10% of your daily requirement?

Multiple Choice

Fat supplies 37KJ per gram. How much fat would you need to eat to get 40% of your daily energy requirements?

• 100.1g

• 90.2g

• 86.4g

• 80.4g

Multiple Choice

Protein releases 16KJ per gram. How much protein would you need to eat to get 10% of your daily requirement?

• 50g

• 30g

• 60g

• 25g

​In your exercise book create a mind-map similar to the one below and answer the prompt questions

​Unit 7: DIET

​How do we calculate energy in food?

​How do we test for energy in food in the lab?

​List the type of food nutrients and state their uses

​what are the common nutrient deficiencies?

​ You can use the link given here to complete this mind-map