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Energy for Life

How do the energy needs of people change and how is the energy contained within foods measured?

'Energy for Life' worksheet

Key stage:  KS 3

Curriculum topic:  Biology: Structure and Function of Living Organisms

Curriculum subtopic:  Nutrition and Digestion

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

Your body changes the chemical energy contained within the food you eat into the energy you need to stay alive. 

 

Different foods contain different amounts of energy. For example, a typical meal of a hamburger, chips and a fizzy drink contains about 4000 kJ of energy.

 

 

The hamburger contains approximately 2000 kJ, the chips contain 1300 kJ and the fizzy drink contains about 700 kJ of energy.

 

This may seem like a lot of energy, but different people have different energy needs depending on their age and lifestyle. Shown below are the approximate energy needs of a wide range of people.


 

Person Energy need per day (kJ)
2 year old  4000
10 year old 8000
14 year old girl 10000
14 year old boy 12000
Adult female 10000
Adult male 11000
Adult male with an active job 14000

 

The energy needs depend on age and lifestyle. An active person requires more energy than a person who works at a computer most of the day.

 

It is important to provide your body with the correct amount of energy. 

 

If a person takes in a lot of energy but does not lead an active lifestyle then they may become overweight, but a person who does not take in enough energy may become underweight, both of which can cause health issues.

 

It is also important to have a balanced diet, containing the correct amounts of vitamins and minerals.

Which of the following are the correct units for energy?

seconds

kiloJoules

decibels

Which of the following people requires the greatest amount of energy per day?

A 35 year old male builder

B 25 year old female office worker

C 14 year old school boy

A

B

C

Match up the correct energy values on the left with the people on the right.

Column A

Column B

4000 kJ
2 year old
14000 kJ
14 year old boy
10000 kJ
Adult male with active job
12000 kJ
14 year old girl

Shown here is a list of foods. Decide whether the foods listed would have a high or low energy content.

 High Low
Burger
Fish and chips
Salad with no dressing
Chocolate cake
Fruit
Baked beans

 Shown below is the label from a common food:

 

 

Use the table to help you work out how much energy is contained in a 300g portion.

1007 kJ

2014 kJ

3021 kJ

What can happen if you consume more energy than your body requires?

you may become underweight

you may become overweight

you will become stronger

Which of the following are part of a healthy diet?

vitamins

alcohol

minerals

a variety of foods

  • Question 1

Which of the following are the correct units for energy?

CORRECT ANSWER
kiloJoules
EDDIE SAYS
Energy is measured in Joules. Named after James Joule who was the first scientist to realise that there are many different forms of energy.
  • Question 2

Which of the following people requires the greatest amount of energy per day?

A 35 year old male builder

B 25 year old female office worker

C 14 year old school boy

CORRECT ANSWER
A
EDDIE SAYS
Adults with active jobs require lots of energy to remain healthy.
  • Question 3

Match up the correct energy values on the left with the people on the right.

CORRECT ANSWER

Column A

Column B

4000 kJ
2 year old
14000 kJ
Adult male with active job
10000 kJ
14 year old girl
12000 kJ
14 year old boy
EDDIE SAYS
Different people have different energy needs. The table in the introduction lists some of the approximate energy needs of a wide range of people.
  • Question 4

Shown here is a list of foods. Decide whether the foods listed would have a high or low energy content.

CORRECT ANSWER
 High Low
Burger
Fish and chips
Salad with no dressing
Chocolate cake
Fruit
Baked beans
EDDIE SAYS
Fatty foods such as burgers and fish and chips are very high in energy. Healthy foods such as salad and fruit are lower in energy.
It is important to be aware of your energy needs and what amount of energy you are consuming.
  • Question 5

 Shown below is the label from a common food:

 

 

Use the table to help you work out how much energy is contained in a 300g portion.

CORRECT ANSWER
3021 kJ
EDDIE SAYS
Food packaging must contain information of the chemical energy contained within the food, as well as providing information on salt content etc...
Here, we can see that 100g contains 1007 kJ of energy. This means that 300g would contain 3021 kJ, as 1007 x 3 = 3021.
  • Question 6

What can happen if you consume more energy than your body requires?

CORRECT ANSWER
you may become overweight
EDDIE SAYS
It is important to lead a healthy lifestyle and make sure that, if you are going to consume lots of energy, you do the right amount of exercise to balance it out.
  • Question 7

Which of the following are part of a healthy diet?

CORRECT ANSWER
vitamins
minerals
a variety of foods
EDDIE SAYS
A healthy diet should be balanced, which means it has a variety of foods that meet the your energy needs.
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