3.3 Calculating RIs
In the next activity you will practise working out reference intake values.
Activity 4 Calculating daily intake
a.
a) they are each 86% of the fat for the day
b.
b) the sandwiches contain just under 9% of the total fat and 10% of the saturated fat
c.
c) the sandwiches contain 10% of the total fat and 65% of the saturated fat
d.
d) the sandwiches contain 10% of the total fat and 30% of the saturated fat
The correct answer is d.
d.
Correct: Because the RI for total fat is 70 g, and the sandwiches contain 7 g, then calculating 7/70 and multiplying by 100, shows that the sandwiches contain 10% of the total fat for the day.
The RI for saturated fat is 20 g and the sandwiches contain 6 g, so a similar calculation (6/20, multiply by 100) shows that the sandwiches contain 30% of the saturated fat for the day. You may find 5.3.2 Reference intake values useful.
a.
a) they could eat 4 bars and would consume close to the RI of fat for a day
b.
b) they could eat 5 bars and would consume just over the RI of fat for a day
c.
c) they could eat 7 bars and would consume slightly more than the RI of fat for a day
d.
d) they could eat 7 bars and would consume more than 50 g over the RI of fat for a day.
The correct answer is c.
c.
Correct: Because one bar weighs 62.5 g, the amount of calories in one bar is about 280. The maximum number of bars that would provide a calorie count of less than 2000 is , which gives more than 7 bars, but less than 8. Each bar contains just over 10 g of fat (there are 17.4 g of fat in 100 g of the bar), so 7 bars would contain just over the RI value advice for fat of 70 g. You may find 5.3.2 Reference intake values useful.