Calories

A calories is the energy needed to raise the temperature of 1g of water, 1 °C. In other words, it’s a unit of measurement for energy. The way food scientists usually measure calories in food is by placing the food or drink item in a bomb calorimeter. In the US, a nutrition label will have the word “calories written, but in the UK and they are instead listed as “Energy”. Calories (i.e. energy) are written as kcal (kilocalories; 1 calorie = 1 kcal) of kJ (kilojoules; 1 calorie = 4.2kJ).

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