Question:
-
State three components of a balanced diet which
provide energy.
-
Four investigations of the energy intake of 14 and 15
year old boys and girls have been carried out in the UK
since the 1930s. These studies show that the average intake
of energy has decreased, while the average body masses of
both boys and girls have remained the same. The results of
these investigations are shown in the Table
| investigation |
average energy intake / kJ per day |
|
boys |
girls |
| 1930s |
12 873 |
11 088 |
| 1960s |
11 739 |
9 534 |
| 1970s |
10 962 |
8 484 |
| 1980s |
10 478 |
8
316 |
-
Question:
-
Calculate the percentage decrease in energy intake for
boys between the 1930s and the 1980s. Show your
working.
-
Suggest two reasons for the fact that the intake
of energy has decreased between the 1930s and the 1980s
while the average body mass has remained constant.
|