Y8 Cover lesson on Energy in Food

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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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?

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