1. WHY WE EAT, WHAT WE EAT EXPLORING ENERGY PART 1 – ENERGY OUT

2. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART I – ENERGY OUT
We all need energy to carry out our bodily functions, such as thinking, breathing and sleeping.
Energy can be measured in calories (kcal) or in joules (KJ) 1 Kcal = 4.184KJ

3. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART I – ENERGY OUT
The amount of energy we need to carry out our basic bodily functions at rest is called our Basal Metabolic Rate (BMR)
Everyone’s BMR differs according to their age, gender, weight, and physical health
Children also need energy to GROW

4. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART I – ENERGY OUT
In addition to the energy we need to keep our bodies running and to grow, we also need additional energy to make our bodies move around and do work, or physical activity
The more active we are the more energy our body requires

5. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART I – ENERGY OUT
Different activities use different amounts of energy. Which activity below do you think uses the most energy?
Cycling
186 kcal/hour
Housework
102 kcal/hour
Dancing
252 kcal/hour
Football
330 kcal/hour

6. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART I – ENERGY OUT
Different activities use different amounts of energy. Which activity below do you think uses the least energy?
Gymnastics
236 kcal/hour
Walking the dog
114 kcal/hour
Playing video games
90 kcal/hour
Housework
102 kcal/hour

7. WHY WE EAT, WHAT WE EAT EXPLORING ENERGY PART 2 – ENERGY IN

8. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 2 – ENERGY IN
All foods and drinks provide energy apart from water
Energy comes from three different nutrients in the foods we eat:
Carbohydrate (1 gram = 4 Kcal)
Protein (1 gram = 4 Kcal)
Fat (1 gram = 9 Kcal)
Fat provides more than double the amounts of energy per gram. So foods which contain a lot of fat also contain a lot of calories.

9. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 2 – ENERGY IN
Which food item below do you think contains the most energy?
Crisps
530 kcal/100g
Baked potato
136 kcal/100g
Boiled eggs
147 kcal/100g
Grapes
60 kcal/100g

10. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 2 – ENERGY IN
Which food item below do you think contains the least energy?
Chocolate cake
358 kcal/100g
Boiled pasta
159 kcal/100g
Lentils
105 kcal/100g
Boiled sweets
327 kcal/100g

11. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 2 – ENERGY EQUALS
75g = ? calories
133
= ? minutes walking the dog 70
= ? minutes swimming 30

12. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 2 – ENERGY EQUALS
1 Big Mac = ? calories
490
= ? minutes walking the dog
258
= ? minutes swimming
117

13. WHY WE EAT, WHAT WE EAT EXPLORING ENERGY PART 3 – ENERGY BALANCE

14. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 3 – ENERGY BALANCE
If we eat the same amount of energy from food than we need then we are said to be in energy balance
However if we take in more energy than we use then we store the excess energy as fat
This leads to weight gain and eventually to overweight and obesity

15. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 3 – ENERGY BALANCE

16. WHY WE EAT WHAT WE EAT EXPLORING ENERGY PART 3 – ENERGY BALANCE
In order to maintain body weight, energy intake through food needs to balance energy expenditure
It is easier to maintain a healthy weight, than it is to lose excess weight