9/18/14
Food calories
Calories are North
American units (full
name is food
calories)
Average 2,000 food
calorie diet (could
vary quite a lot;
depends on the
individual)
When you travel … Europe
kcal, kJ
What are
these?
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9/18/14
When you travel … European Union
kcal
=
kilocalories
When you travel … Australia, New Zealand
kJ
=
kilojoules
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9/18/14
In physics …
1 kcal = 4.18 kJ
1 kcal = 1000 cal
but for food labels
1 kcal = 4.18 kJ (same as physics)
1 kcal = 1 cal (also called food calorie)
so …
When you travel … European Union
This is 958
food
calories, i.e.,
958 calories
as we
commonly
say in North
America
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9/18/14
When you travel … Australia, New Zealand
Recall: 1 kcal = 4.18 kJ
so 1 kJ=1/4.18 kcal
608 kJ = 608/4.18 kcal
= 145.45 kcal
i.e., 145 (food) calories
Recall: 1 kcal = 4.18 kJ and 1 kJ=1/4.18 kcal
180 kJ = 180/4.18 kcal = 43.06 kcal
i.e., 43 (food) calories
(the label should read 43 and not 42 kcal)
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