338 Diet and Health
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but commonly understood ‘calories’ instead of the correct unit, kilocalories (kcal). A kilocalorie (in
this book, calorie) is the amount of energy required to raise the temperature of a litre of water 1°
centigrade. In the metric system, energy is measured in joules; 1 kcal = 4.2 kilojoules (kJ).
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